- 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.
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- 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.
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- 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.
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- 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.
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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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