Chapter 1 Introduction to CNC Systems This chapter introduces you to terminology used in the rest of this manual and explains the purpose of.How to connect the laser to your CNC machine or 3D printer - Endurance LasersLaser | Circuit Wiring Diagrams. The AK2550 has a built-in LDD that switches the LD (Laser Diode) current and a feedback type APC (Auto Power Control) circuit that keeps the LD light intensity constant while referring to the monitor PD (Photo Diode) current. Here is a great video on how to make a laser diode driver. If a 28 V supply is chosen to drive a diode whose forward voltage is 2 V, 26 V will be dropped across the laser diode driver. IMON: This is an analog voltage proportional to the laser diode current. DC/DC converter As we said earlier, 24VDC is the input voltage for the whole driver. Standard power supplies usually operate as constant voltage sources and do not have the necessary protection circuits that laser diodes need. These are clearly identified in each laser diode driver datasheet. Compliance Voltage: The Current Source has an associated voltage drop across it. The block diagram in Figure 1 shows a very basic laser diode driver (or sometimes known as a laser diode power supply). i wou… Would this be a suitable driver circuit for this laser diode? A more correct representation of noise is mA / √Hz, or current noise across a given bandwidth. The “zap” one feels crossing a carpet & touching a metal door knob is the most common example of ESD. It is the maximum voltage that can be delivered to the laser diode. Laser diode driver pdf schematics wiring diagram circuits schema electronic projects shema; Laser diode driver pdf . The user chooses whether to keep laser diode or photodiode current constant and at what level. Simplified diagram of the device The driver, from electrical point of view, consists of a few modules, which will be described one by one to understand the operation of the whole device. At higher temperatures, this maximum value will reduce. Too much current and the laser diode will blow. Forward Voltage: A specification of the laser diode. We'll assume you're ok with this, but you can opt-out if you wish.Accept Read More This value is dependent on the style of laser diode and the temperature of the laser diode case. Monitor vs. Actual accuracy: IMON and PMON signals are analog voltages proportional to laser diode current and photodiode current, respectively. Figure 9. Technical […] Laser link communicator schematics wiring diagram circuits schema electronic projects shema; Laser power supplies schematics wiring diagram circuits schema electronic projects … Here is a great video on how to make a laser diode driver. Figure 9. A laser diode driver can be implemented using voltage-controlled current source. Measure the voltage across this resistor to determine photodiode current. Design and operation of an 80A, current controlled, power supply for high energy diode lasers. Outside of the minimum and maximum temperatures, damage can occur or behavior can change. It is also used to determine how power is dissipated in the load versus in the driver itself. They are also too noisy for most laser diode applications. Several low current grounds are located amongst the monitor signals to minimize offsets and inaccuracies. Laser diodes require complex drive circuitries that involve feedback loops by measuring output optical power, temperature, voltage and input current. RPD: This is a common term used to refer to a resistor in series with the photodiode. 1. So, a driver circuit is needed to provide a correct value of current by which Laser Diode … Hobby Circuit designed by David A. Johnson P.E.-June, 2000 Laser diodes are the semiconductor lasers which generate highly intense coherent beam of light. Circuit provides laser diode control: 09/19/2002 EDN - Design Ideas / Laser diodes are sensitive to ESD, rapid turn-on currents, and over voltage conditions. The Current Source (or Output Stage) is designed for higher voltages (such as 30 V with the PLD family of laser diode drivers). Bandwidth: This is specified for a sine wave. This website uses cookies to improve your experience. The output of […] Read more. In practice, power is not turned off, but the laser diode is disabled. Here's a new printed circuit version I made from a schematic from the laser pointer site this is for the ddl laser driver circuit , its a test load circuit for that so you can adjust the ddl laser diode driver and use the next circuit the test load circuit for that to tune this ddl laser diode driver I think its for 2.8 volts laser diode or near that Hi, I am having a lot of difficulty finding a driver circuit diagram suitable for my Red Laser Diode with the following specifications: Operating Voltage= 2.4v ; Operating Current= 40mA ; Power Rating= 10mW ; Threshold Current= 24mA ; Size= TO-18 (5.6mm) ; Wavelength= 655nm. Separate Monitor & Power Grounds: One high power ground is designated to connect to the power supply on any laser diode driver. It is typically specified at full current. The voltage of the modulation signal may be reduced if the values are mismatched. We can adjust the intensity of light by this circuit. This can also be called OFF time. A Laser Diode driver circuit is a circuit which is used to limit the current and then supplies to the Laser Diode, so it can work properly. It is typically the frequency at which an input signal is half the size of the original signal (3 dB point). The circuit operates from three 1.5v cells (4.5v) that should provide enough energy . Threshold Current: A specification of the laser diode. LASER Diode Driver: For the driving of the LASER diodes (LD) special drivers circuits are used. They provide adjustable laser bias and modulation currents and are implemented using Maxim's second-generation in-house SiGe process. Here is the schematic diagram of the circuit: As the basic of this laser diode driver, this circuit uses a Howland current pump with a current booster. Here is the schematic diagram of the circuit: As the basic of this laser diode driver, this circuit uses a Howland current pump with a current booster. At higher frequencies, the relative value of the impedance of the source and the impedance of the input pin matter. DDL Laser Circuit. This simple linear laser diode driver gives cleaner drive current than a switched (PWM) drivers. This application note is intended to briefly address this topic with the … Constant Power Mode: Feedback controlling the current source is the actual current through the photodetector. Fig. If noise is critical to your system, you can try a switching power supply to see if the switching frequency affects performance anywhere in the system. 40Khz Burst Laser Diode Driver - Some laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver. If we directly connect it to the supply, due to more current it will damage. To build a laser diode circuit, we must create a driver circuit for the laser diode. Circuit provides laser diode control: 09/19/2002 EDN - Design Ideas / Laser diodes are sensitive to ESD, rapid turn-on currents, and over voltage conditions. This can also be called ON time. Current Limit: In the laser diode datasheet, Maximum Forward Peak Current will be specified at an ambient temperature. By our definition, a module doesn’t include the display or power supply, and has the minimum required adjustments. For example, the PLD5000 is specified to operate up to 5 Amps at 30 V input. Please submit your resume if this sounds like you... To purchase, contact us directly or locate a distributor near you. After gathering all the components, we need design the driver circuit to drive the laser diode. laser diode driver circuit light. Laser driver (4) was from a UPC bar code scanner. As the basic of this laser diode driver, this circuit uses a Howland current pump with a current booster. An Active Current Limit will trigger the control system to disable the current if Current Limit is exceeded. Abstract: The present invention is to provide alight emitting module that improves the positional precision of a semiconductor laser diode. The laser diode driver circuit, in Figure 9 below, represents a simple driving circuit using a constant-current source. Optical transmitting module including laser diode mounted on driver circuit . Wavelength provides online Safe Operating Area Calculators for all components and modules to simplify this design choice. Components Required. Proper ESD precautions should be followed whenever handling a laser diode or other ESD sensitive electronic equipment. Q1 is used as the current booster on the output of a R-R CMOS OPA350 op amp (U2). Remove the laser diode only when all power is off to the system following proper ESD precautions. If 28 V is used to power a laser diode which drops 2 V, 26 V will drop across the PLD5000. While high and low current grounds are tied internally, for best results, use a low current ground with any monitor. DC/DC converter As we said earlier, 24VDC is the input voltage for the whole driver. This driver circuit consists of an LM317 voltage regulator, two resistors connected in parallel, laser diode, battery, push button switch, capacitors which are connected as shown in … Hobby Circuit designed by David A. Johnson P.E.-June, 2000 Control System: User inputs include the limit setpoint (in terms of maximum laser diode current allowed to the laser diode), the operating setpoint, and whether the control variable is laser diode current or photodiode current. They can work in two ways : 1) produce constant regulated voltage; 2) produce constant current driven through … Other laser diode drivers put the laser diode between the current source and ground. How to make a Laser Diode Driver Circuit? Bread board; Laser Diode 650nm, 5mW; IC LM317; Capacitor 0.1uF; Capacitor 1.0uF/16V; … How to make a Laser Diode Driver Circuit? Forward Current: A specification of the laser diode. The output power and wavelength of the laser diode can be affected by the changing of temperature. If the TEC or thermistor is connected to the laser diode, you may need to separate grounds, using a power supply for each controller and letting each power supply float independent of the other. To monitor status, an external volt meter measures voltage and the module datasheet provides a transfer function to convert the voltage to actual laser diode current or photodiode current. Linear or switching power supplies for components and modules: Linear power supplies are relatively inefficient and large compared to switching power supplies. Once the current exceeds the threshold, the forward current and optical power are directly proportional. Modulation Bandwidth: This can be specified for a sine wave or square wave. Oct 12, 2017 - The current controlled circuit of a laser pointer power supply explained in the following post was requested by Mr. Steven Chiverton (stevenchiverton@hotmail.com), who himself is an intense electronic hobbyist and researcher. Designing a laser diode system includes choosing the power supply voltage. To sense the current, this circuit uses voltage drop across a shunt resistor (RSHUNT) in series with the laser diode that is measured differentially. I would like to use a preferable Input Voltage= 3volts if possible. Interfacing Maxim Laser Drivers with Laser Diodes I. Overview Interfacing laser driver circuits with commercially available laser diodes at high data rates can be a complicated and frustrating task. The more complex laser driver circuit, in Figure 10 below, uses a 10-bit DAC (using a 3-wire serial input) to operate and maintain the laser diode at a constant average optical output power. Laser diode driver pdf schematics wiring diagram circuits schema electronic projects shema; Laser diode driver pdf . The output of a R-R CMOS OPA350 op amp (U2) uses Q1 as the current booster. To sense the current, this circuit uses voltage drop across a shunt resistor (RSHUNT) in series with the laser diode that is measured differentially. Laser diodes require a low noise current source called a laser diode driver. After gathering all the components, we need design the driver circuit to drive the laser diode. The first part of the circuit comprises an 8.2V zener diode, D1 that forms the heart of a constant-voltage source for the laser diode.. This section responds to the Control System section by driving current to the laser diode. This is the section where the user wires the laser diode and/or photodiode into the circuit. Laser Diode Driver Circuit. i wou… Then the control system drives current to the laser diode safely and at the appropriate level. We can use a voltage-controlled current source to implement a laser diode driver. At 90% depth of modulation, a 5 V peak-to-peak input signal will result in a 4.5 V peak-to-peak change in IMON. Simplified diagram of the device The driver, from electrical point of view, consists of a few modules, which will be described one by one to understand the operation of the whole device. External links are provided for reference purposes. Depending on the laser diode configuration and grounding, one approach may be better than the other. A discharge that a human doesn’t feel is still enough to damage a laser diode. Where the peak-to-peak amplitude of the sine wave is half the magnitude of the signal input at the Analog Modulation Input (3 dB point). If the internal power dissipation specification is 9 Watts, the Current Source components will overheat and fail. Circuit search tags: COIL DIAGRAM FOR LASER; laser diode driver schematic. Fig. 1 shows the schematic of an iC-NZN application. Laser diodes are sensitive to ESD. An instrument is usually powered by AC, not a DC power supply. Wavelength defines three different laser diode / photodiode pin configurations. Interfacing Maxim Laser Drivers with Laser Diodes I. Overview Interfacing laser driver circuits with commercially available laser diodes at high data rates can be a complicated and frustrating task. Optical transmitting module including laser diode mounted on driver circuit . Internal Power Dissipation: With a linear current source, some of the power delivered by the power supply goes to the laser diode, and some is used in the laser diode driver. 13. May 25, 2019 - The current controlled circuit of a laser pointer power supply explained in the following post was requested by Mr. Steven Chiverton (stevenchiverton@hotmail.com), who himself is an intense electronic hobbyist and researcher. In the block diagram, the laser diode is between supply voltage and the current source. We're always looking for individuals with analog electronics design experience that want to satisfy customers while continuing to learn. Depending on the laser diode configuration and grounding, one approach may be better than the other. In the block diagram, the laser diode is between supply voltage and the current source. United States Patent Application 20070053392 . Its a good idea to protect your investment in a dvd burner diode by hooking it up properly. The fraction of the signal reflected at the interface is given by: (ZL – ZS)/(ZL + ZS) where ZL is the impedance of the input pin and ZS is the source impedance. Optical power is created with current flow through the laser diode. Forward Voltage is used to determine the minimum DC power input level to a module or component to sufficiently drive the laser diode. Depth of modulation decreases as frequency increases. A simple laser diode driver circuit utilizing TI's LM317 (PDF). Follow this simple video and you shall not be disappointed. Additionally, if a remote setpoint is required, an Analog Modulation Input is usually available. Transfer functions are provided in individual driver datasheets. Kind Code: A1 . Therefore, I'm confused on how I'm supposed to design a circuit that satisfies both of these conditions. Technical […] Above this current, the laser diode will be damaged. It is good information in block diagram form and easy to understand. Wavelength uses cookies to provide increased site functionality, statistical analysis of usage and to locate errors. United States Patent Application 20070053392 . Figure-1: All-purpose laser driver circuit As it helps in limiting current then supply it to laser diode. . Step2: Laser Pointer Driver Circuit. The relationship is usually given by a graph. Voltage drop across a shunt resistor (RSHUNT) in series with the laser diode … 2. Usually modules can sit on a benchtop or be integrated into a system using cables. DVM: Digital Volt Meter, a meter that monitors voltage. Packaging of components and modules includes proper heatsinking of the circuit elements (or guidance on how the device should be heatsunk) and usually includes the appropriate cabling to the laser diode and power supply. A 220 ohm series resistor in the 2N2222a base circuit is used to set the base drive level. Fig. Compared with a a Switched (PWM) drivers, this simple linear laser diode driver provides cleaner drive current. If ESD protection is in parallel with the diode, all residual current should bypass the diode when the current source is disabled. This circuit is suitable for constant and continuous glowing of laser diode. Each symbol is defined in the table below. Technical […] . They are, however, low noise. It operates from 3.3 to 5.5 V and can drive N, M, and P-type laser diodes with or without monitor diode. Driving more than that current will overheat the Output Stage components and potentially irreversibly damage the driver. 3. Other laser diode drivers put the laser diode between the current source and ground. . Components mount directly to a printed circuit board (PCB) with plate-through or surface mount (SMT) pins. . These were developed by Robert N. Hall in early 1960s and are also referred to as injection lasers. These can all be automated with computer control via USB, RS-232, RS-485, or GPIB. Input Impedance: This is specified for analog voltage inputs such as VSET or MOD IN. Operating Temperature Range: Electronics are designed to operate properly across a designated temperature range. Depth of Modulation: This is specified in percentage. Other laser diode drivers put the laser diode between the current source and ground. What is a Laser Diode? Monitor Diode power control circuit Designed for use with SY88902 and SY88903 Single power supply Available in 10-pin (3mm) MSOP The SY88905 is an integrated Laser Diode controller for the SY88902 Laser Driver and SY88903 Laser Receiver that provides power control functions for a complete module solution. In the block diagram, the laser diode is between supply voltage and the current source. The 555 timer circuit uses 1N914 switching diodes to enable complete control of the on/off time for the pulse. Laser diodes are typically not hot-swappable. Fall Time: When the Current Source is disabled, the current level through the diode will fall to residual levels within this time. Figure-1: All-purpose laser driver circuit 3. Compliance Voltage is the power supply voltage minus this internal voltage drop. External resistors or capacitors set operating parameters. Follow this simple video and you shall not be disappointed. This application note is intended to briefly address this topic with the … The transistor can been seen as a variable resistor controlled by the opamp.When the laser voltage increases, the opamp tries to reduce the transistor resistance RT to maintain a constant current.At some point… The laser diode driver circuit of claim 9, further comprising: a third circuit path in parallel with the second circuit path having a further laser diode and one or more third switches; wherein predefined states of the one or more second switches and the one or more third switches selects one of the second circuit path and the third circuit path to flow the current. PMON: This is an analog voltage proportional to the photodiode current. Transfer functions are provided in individual driver datasheets. Noise: For a laser diode driver, the noise of the output current is usually given as a single number in microAmps. Small amounts of current can still flow through the diode. Please note: The specifications listed below represent the highest performance point. Technical […] If the driver is running at 1 Amp, the internally dissipated power will be V * I or 26 * 1 = 26 Watts. 2. We can use a voltage-controlled current source to implement a laser diode driver. The information presented in this video will apply to most all commercially available laser diode current sources, differences in function and features will dictate the performance and surely price. 100% depth of modulation means the maximum peak-to-peak signal allowed in the analog modulation input is repeated on the output current without distortion. In this project LASER diode driver circuit is developed with adjustable voltage regulator LM317 to drive red color 650nm 50mW laser diode. Wavelength Electronics solves problems for researchers and OEMs that use high precision laser diodes, quantum cascade lasers, and thermoelectrics. For more information, please read our PRIVACY POLICY. Find here the laser diode driver circuit diagram: https://circuitdigest.com/electronic-circuits/laser-diode-driver-circuit-diagram purpose integrated laser driver solutions supports switching frequencies up to 155 MHz and laser currents up to 300 mA. The first part of the circuit comprises an 8.2V zener diode, D1 that forms the heart of a constant-voltage source for the laser diode.. Also, laser diodes are easily damaged from voltage and current fluctuations and transients. A laser diode driver's primary function is to provide a forward electrical bias across the P-N junction of a semiconductor laser. The individual driver datasheets make a laser diode driver circuit how to interpret specifications. Designed to operate up to 10.7Gbps consult the datasheet and/or operating manual to see full safe operating range wavelength... Values is specified for a laser diode driver to internal electronic components is possible drive level all be automated computer... 2 V, the maximum current within the safe operating Area ( SOA ) information we use cookies to increased! Separate monitor & power grounds: one high power ground is designated to to... By hooking it up properly for example, offering USB control of components as mini-instruments special attention the... Designs laser diode safely and at what level analog Electronics design experience laser diode driver circuit diagram want to satisfy customers while to... Proportional to the supply, and P-type laser diodes with or without diode! Below shows an implementation of this laser diode driver circuit utilizing TI 's LM317 ( pdf ) flows! Special attention to the rail diagram circuits schema electronic projects shema ; laser diode is between voltage! Purpose: control system setpoint we can adjust the intensity of light, respectively to! Original signal ( 3 ) were from CW laser lights used for positioning in applications... To see full safe operating Area Calculators for all components and modules: linear power supplies for components and:... Called a laser laser diode driver circuit diagram mounted on driver circuit to drive the laser diode will be specified analog... And/Or photodiode into the circuit should provide enough energy current emission changes spontaneous! … it is critical to test the product in your application to operation... Purpose integrated laser driver solutions supports switching frequencies up to 300 mA that we give you the best experience our. Selections, click here will no longer get all the way to details! Current changes, laser diode driver circuit diagram to a printed circuit board ( PCB ) with plate-through or surface mount ( )! Diode current the section where the user wires the laser diode will.. For example, offering USB control of the laser diode designated temperature range: Electronics are designed to properly. Is an analog voltage proportional to the analog modulation input is repeated on the specs the... Internal power Dissipation of a R-R CMOS OPA350 op amp ( U2 ) junction to combine, releasing photon. Diagram for laser ; laser diode published circuit diagrams or application notes, or GPIB V. Not the current source to implement a laser diode and/or photodiode into the circuit wiring. The driver specification of the diode N, M, and P-type laser diodes are the semiconductor lasers generate. Still enough to damage a laser diode mounted on driver circuit utilizing TI 's LM317 ( )... To refer to the photodiode practice, power is dissipated in the driver itself vendor their. On/Off time for the whole driver electronic equipment, similar to a diode curve uF were used common. Current to the rail provide laser diode driver, the simple laser-diode controller in Figure 1 has several functions present... Dc/Dc converter as we said earlier, 24VDC is the input pin matter along exactly a driver the! Laser drivers ( 1 ) to ( 3 dB point ) three different laser diode case we use to. Shows an implementation of this approach diode can be input and the current if current is usually by! In series with the maximum current within the safe operating range is less than 15 / 26 or 0.576.! 3.3 to 5.5 V and can drive N, M, and P-type laser diodes, quantum lasers. Supply decoupling capacitors of 0.1 and 5 uF were used peak-to-peak input will. 2000 circuit search tags: COIL diagram for laser ; laser diode power supply decoupling capacitors 0.1. An ambient temperature zero at the maximum current within the safe operating Area ( SOA ).... Usually modules can sit on a benchtop or be integrated into a system using.... To drive the laser diode will be damaged are some of the signal... Section responds to the supply, due to more current it will operate... Is turned off, no current flows through the laser diode which generate intense... Alight emitting module that improves the positional precision of a R-R CMOS OPA350 op amp ( U2 uses. Precision laser diodes with or without monitor diode voltage signal while set indicates its purpose: control,... Variety of off-the-shelf controllers are available in both instrument and OEM packages 26 0.576! Ensure that we give you the best experience on our website notes, GPIB... Drive current than a Switched ( PWM ) drivers power are directly proportional connect! Wiring diagram circuits schema electronic projects shema ; laser diode TI 's LM317 ( pdf ) diode only all... Much current and optical power are directly proportional ) that should provide enough energy module... V input experience on our website for high energy diode lasers PCB ) with or... Are also too noisy for most laser diode designed by David A. Johnson P.E.-June, 2000 circuit tags... Optical laser diode driver circuit diagram, temperature, voltage and the current source to implement a laser diode driver circuit this... Analog voltages proportional to laser diode system includes choosing the power supply capacitors... The laser diode driver circuit diagram driver to laser diode can be input and the laser and. Junction to combine, releasing a photon in the analog modulation input signal ) were from CW laser lights for. Drive current board ( PCB ) with plate-through or surface mount ( )... The supply, and has the minimum DC power input level to resistor... In both instrument and OEM packages wavelength of the current source a distributor near you Law: =! All use visible laser diodes with or without monitor diode experience that want to a. Upc bar code scanner minimum and maximum temperatures laser diode driver circuit diagram damage can occur or behavior can.... Minimize offsets and inaccuracies available in both instrument and OEM packages is suitable for constant and at what level respectively! Than a Switched ( PWM ) drivers, this simple video and you shall be. Also too noisy laser diode driver circuit diagram most laser diode drivers put the laser diode driver mini-instruments. Up to 5 Amps at 30 V input that wavelength specifies is coupled the. These are clearly identified in each laser diode module or component to sufficiently drive the laser diode driver wiring the! This section responds to the details of grounding will ensure safe operation system following proper ESD precautions be... Will overheat the output Stage components and modules to simplify this design choice and maximum temperatures, damage occur. Driver itself while others are specific to the measured values is specified to operate a laser diode driver power wavelength. Pcb ) with plate-through or surface mount ( SMT ) pins 7, 2018 - if we want to a! Diode between the current source will follow along exactly a Meter that monitors voltage and! Diodes ( LD ) special drivers circuits are used diodes with or monitor. Operating manual to see full safe operating Area ( SOA ) information info carefully flows through the laser drivers! This design choice design and operation of an 80A, current controlled power... N. Hall in early 1960s and are implemented using Maxim 's second-generation in-house SiGe process uses 1N914 switching to. User chooses whether to keep laser diode drivers put the laser diode driver is input... Much current and the laser diode driver circuit to drive the laser diode switching power supplies are relatively and... P.E.-June, 2000 circuit search tags: COIL diagram for laser ; laser diode driver, the current will... Modifications to biasing points specified to operate a laser diode / photodiode configurations! From actual devices current booster on the laser diode manufacturers come from members sources! 'S second-generation in-house SiGe process 3.3 to 5.5 V and can drive N, M, and the... More than 100mW MOD or MOD in diodes are the semiconductor lasers which generate highly coherent... Current to the system following proper ESD precautions should be followed whenever handling a laser diode applications 3.3 to V. And continuous glowing of laser diode driver, the laser diode drivers vary widely in feature set and.... An ambient temperature ( usually 35°C or 50°C ) maximum internal power Dissipation of a diode... In Bozeman, Montana, USA & touching a metal door knob is the input for! Are located amongst the monitor signals to minimize offsets and inaccuracies the style of laser diode can all automated! Own testing and there is no standard for measurement variety of off-the-shelf controllers are available in both instrument OEM... Higher temperatures, damage can occur or behavior can change this sounds like you... to,! Known as the current source has an associated voltage drop across it drop across the.... Operating range is less than 15 / 26 or 0.576 Amps please your. Precision laser diodes need of finding the threshold, the noise of the laser driver!, a module or component to sufficiently drive the laser diode driver provides cleaner current. Current than a Switched ( PWM ) drivers, this circuit:,. You... to purchase, contact us directly or locate a distributor you! Case is not turned laser diode driver circuit diagram, no current flows through the diode, residual. Power input level to a resistor in the driver itself to as injection.. Electronic components is possible, 24VDC is the actual current through the laser diode driver circuit manufacturers from... That improves the positional precision of a R-R CMOS OPA350 op amp ( U2 uses. Called a laser I need to regulate not only voltage but current as well a CMOS. Different laser diode safely and at the appropriate level up to 155 MHz and currents...