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Laser Circuits
Designed by David A. Johnson, P.E.
Last Updated on: Thursday, January 01, 2009 06:57 AM

Master Category List - Dave's Circuits
 
  • 20MHz VCSEL 3mW LASER TEST CIRCUIT
    This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC. The circuit can easily be modified to transmit signals from kilohertz to about 50MHz.

 
  • 40KHz LASER BURST DETECTOR
    This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video
    projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse
    whenever it detects a 3ms to 5ms laser burst, modulated at 40KHz. It is very sensitive and could be
    modified for long range laser communications.
  • LASER/LED LIGHT OUTPUT INTENSITY METER
    This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance amplifier to measure the light power output of infrared and visible LEDs and laser diodes. It can be modified to produce almost any milliwatts to volts scale factor. It can be connected to either a multi-meter or an oscilloscope.
  • MICRO POWER 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. The circuit operates from three 1.5v cells (4.5v) that should provide enough energy for about 200,000 shots.
  • Modulated Laser Diode Tester
    This circuit can either be used to test laser diodes or as a general purpose modulated light source. The circuit has an adjustable diode threshold current and an adjustable modulation frequency. The frequency can be adjusted from below 30KHz to above 50MHz. It is powered from a 9v battery.

 


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