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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.
Laser Used as
Vehicular Traffic Counter
This is an illustration how a laser could be used to count traffic and measure
the speed of each car passing through the sensor area. (added 7/06)
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.
Modulated Laser Light Source
Do a lot of optical electronics work. Often I need to test a modulated light
detector hobby circuit at a particular frequency. The device below has come in
handy many times. I can adjust the frequency of the modulated infrared laser.
