- AMI’s Model 762 OEM programmable seed laser diode drivers (pump laser diode drivers) are ideal for driving 14-pin butterfly packaged laser diode modules for use in CW or pulsed fiber MOPA systems for materials processing, LIDAR systems for remote sensing, laser communication applications and rangefinding.
- A driver circuit is a circuit which can limit appropriately the amount of current being fed into the laser diode, so that it can function correctly. Too much current and the laser diode will blow. Too little current and the laser diode will not have sufficient power to turn on and operate.
- Nov 17, 2017 Circuit Diagram. Laser Diode Driver Circuit. 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. If we directly connect it to the supply, due to more current it will damage. If current is low then it will not operate, because of not having sufficient power.
Alibaba.com offers 104 laser diode driver circuit products. About 46% of these are integrated circuits, 20% are laser equipment parts, and 4% are sensors. A wide variety of laser diode driver circuit options are available to you, such as free samples. CW Laser Diode Drivers. AMI offers a line of CW laser diode drivers for both high current and low current applications. The AMI Model 787 is ideal for compact industrial and medical laser applications. Proprietary technology allows AMI to offer a 50 A, 2.5 V CW diode driver with industry leading efficiency and footprint.
Recently I got a couple of powerful laser diodes from a friend abroad. The ‘invisible’ (infrared) laser diodes with 1000mW and 2000mW power (808nm wavelength) are good for numerous applications like solid-state laser excitation, infrared illumination, etc. Technically, typical operating voltage (Vop) of the 1W laser diode is 2.0V and operating current (Iop) is 1.1A, as found in the Xerox of the datasheet that came with the packet.
First Drive
Since there’s no specific design idea in mind, at first I tried powering the 2-pin laser diode (attached to a TO-5, 9mm heatsink) from a digital power supply module and found that the laser diode in close proximity (without any optics) can moderately burn thinnest black plastic films.
Although the laser diode can be powered from an adjustable power supply with a series-resistor, my test method proved to be deficient because it damaged the connected laser diode after a few experiments. Later, I discovered that it’s due to the high-current flow from the buffer capacitor at the output of the power supply module (when power supply was turned on without the laser diode at its output, buffer capacitor got charged to near supply voltage level, and when laser diode was connected to the live power supply, buffer capacitor immediately discharged through the laser diode and resultant current flow destroyed the laser diode bit by bit).
Next Driver
When it comes to an improved laser diode driver, the ubiquitous LM317-based circuitry in current limit configuration would seem a better choice. Winrar 64 download windows 7. The LM317 can cater current up to 1500mA which makes it possible to use it for >1000mW laser diodes. We can even add a simplistic PWM (or on/off) control to the driver by interfacing a microcontroller’s I/O through an appropriate circuitry connected with LM317. However, note that this LM317-based idea works well only with infrared (IR) laser diode (not with other higher-voltage colors).
In the above shown schematic, LM317 (IC1) is configured as a constant current source capable of catering 1000mA of output current. Here the 1.2 ohm/2w resistor (R1) sets the output current (I=1.25/R1). Remember, since IC1 has an inherent dropout voltage of ~ 1.5V to 2.5V (depending on the current being supplied and the temperature), you should use a supply voltage (Vin) higher than the target output voltage, ie. the Vop of the laser diode (LD). Besides, you can vary the current being delivered (drawn by the laser diode) by replacing R1with a multi-turn preset potentiometer. Also, try to replace the 100nF capacitor (C1) connected in parallel across the input with a 47-100uF one to ensure the improved stability of the driver.
Another advantage of this design is that the jumper (X1) can be replaced with a little logic-level MOSFET based add-on circuit (see next schematic) to use TTL output from any microcontroller for enabling/disabling (H=Enable) the laser diode.
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Quick Drive Solution
If addicted to eBay, you can find quick solutions for driving laser diodes by fetching one of the CV/CC dc-dc buck converter modules like the one shown below. It’s a low-cost high-power, 1.5V to 33V/3A switching dc-dc buck converter with Constant Voltage (CV) and Constant Current (CC) output capability. At the heart of the module is the venerable LM2596 (https://www.onsemi.com/pub/Collateral/LM2596-D.PDF).
Warning! Laser diode emits extremely dangerous visible and invisible laser radiations, and can cause burns or fire. Never look into a working laser diode (or point it on a reflective surface) as it may permanently damage your eyes!