Red Beam Laser
September 2nd, 2010 | 
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Red Beam Laser
Is it against the law to beam a red laser light into someone's house?
Last night about 1am my family was telling me they were noticing some red light wizzing around the wall but couldn't identify it. After some discussion they said they saw it again so I went outside to check the back yard and saw a man dressed all in black on top of the roof of our backyard neighbors house. I told him to stop or I would call the police (we still called the police). If we find out who was doing it, could we press charges, or could we get legal payback? The family was very scared and hardly got any sleep, and the laser was even going across my mother's eyes a couple of times.
It is against the law because your invading someone elses privacy.
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50mW Ultra Powerful Red Beam Laser Pen Pointer Light
How Can I Detect a Laser?
I want to built a type of trip wire sensor using a laser and some type of detector. This would be kind of like the trip sensor on a garage door (I know those are Infrared). The laser would be a simple red laser pointer. I was hoping someone could give me a little direction for what types of detectors exist that could sense the laser beam shining directly on it. Thanks.
Use a photo diode or a photo transistor. You would be much better off with an IR laser because there are photo diodes and transistors in IR transparent but optically black packages which suppress sunlight, flicker from fluorescent lights. This will make your circuit much more sensitive for the laser and much less sensitive for stray light.
Connect the photo diode to a transimpedance amplifier and the output of that to a discriminator. That's pretty much it. If you want to be less sensitive to stray light, modulate the laser at 10kHz and add a 10kHz bandpass filter and a rectifier to your circuit. That will get you another factor of 100 of stray light suppression easily. I built something like that a few months ago. Took me a couple of evenings to make it work. It's not too hard. And along the way you will learn a lot about circuits.
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