High Current Laser Diode Driver Circuit

Their are kw level drivers available in pulsed and qcw mode versions.

High current laser diode driver circuit. The project has an onboard multi turn potentiometer to adjust the output current with great accuracy. As battery start giving supply it first flow through the ceramic capacitor 0 1uf. Depends on application laser chosen at different range nm nano meter wavelength and watts. Therefore a driver circuit is needed to give precisely the correct range of current needed so that our diode will operate.

An active current limit circuit will disable the laser diode driver current. Working of laser diode driver circuit. The module is a great tool to drive low cost laser diodes with superb accuracy. The second type is more easy to design and use and different circuits for their implementation exist.

This circuit is. Too much current and the laser diode will blow. Quick look at a laser driver circuit. In this project laser diode driver circuit is developed with adjustable voltage regulator lm317 to drive red color 650nm 50mw laser diode.

These vary widely between laser diode drivers. 25 amps 40 volts high current high voltage laser diode driver oem module maiman electronics llc 525 00 15 amps 58 volts 15 a 58 v 600 watt maximum high power laser diode driver lacosys laser control systems gmbh. To accommodate a wide range of laser diodes the feedback gain can be set by using jumpers between any combination of the five gain setting resistor pins to the power supply common. 1 produce constant regulated voltage.

To build the driver circuit we are going to need a voltage source a voltage regulator a diode an electrolytic capacitor and a few resistors. 2 produce constant current driven through the ld load. This allows lasers with monitor currents over a range from 5 μa to 5 ma to be used with a single driver. They can work in two ways.

These are by no means standards just a generalization based on the author s experience in the laser diode controller world. The user determines the maximum setting and the output current is kept from exceeding that level. This capacitor is used to filtering high frequency noise from our dc source and gives to input pin3 of the lm317 voltage regulator ic. Laser light amplification by stimulated emission of radiation and laser diodes are widely used in different domain applications it gives focused light ray in visible spectrum and laser diodes will perform good in regulated constant current.

Laser diodes are harmful and should have some sort of constant current circuit as a basic protection for the laser diode. For the driving of the laser diodes ld special drivers circuits are used. Diode drivers employing intelligent high frequency switching circuitry to produce the output current pulse are much more tolerant of changing operational conditions and also are inherently more efficient than linear diode drivers. A high power laser diode driver is 5 amps and up to 100 s of amps in a cw mode.

This circuit can drive diode starting from 0 ma to 115ma usually these cheap diodes require around 30ma current. As a result i built this circuit which provides highly accurate current control. Some limit circuits cap the current at the max level and keep operating.