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Thanks, HaloBlu I think the high power would be too risky for my use. These will be used in projects and experiments for Technical High School students. I would prefer to stay with less than 5mW. I have found some interesting sensors and technology from Pepperl + Fuchs in Germany and IMF but...

ossumguywill and HaloBlu - Thanks for the suggestion on the wiimote camera. I will check it out. One of the problems I have been having is that the reflection of the beam from the low power pointer is widely dispersed and not really very bright. I definitely need something that is sensitive...

Does anyone know what circuit component is used in those archery laser range finders to detect the reflected laser beam? Who makes the component or Integrated Circuit? I would like to buy one to use in projects and experiments. Thanks, LBC

That's really a neat science project, Kendall. Once we get our feet wet playing with the lasers and photodiodes, I may have some questions for you or ask for project suggestions. I have some photo resistors and I will play with them tomorrow (after I shovel snow). Thanks, LBC

Thanks, Bluefan. We have already played with taking the pointers apart. It has been over 30 years since I played with opamps but if I remember they are pretty easy to plug and play with. I can probably find an idiots guide to using them. I do remember building a bandpass filter with them. I...

Wow, Bluefan, that sounds like what we would like to try. I am not sure exactly what you mean by "completely diffuse" but I notice if I point the laser dot at styrofoam cup and angle the cup toward a white sheet of paper I can see the paper has red light covering it (not a dot like when I...

Thanks, Lasersbee and HMike. I guess as a start I would want to just detect the laser or its reflection. Modulating one of the cheap pointers might be an interesting or imposing project. Maybe I could come up with some way to pulse it on and off. If I use a demodulating circuit wouldn't I...

Again, thanks, HMike. I will look and ask questions before I buy one. I am surprised that IR would have a long range. How far do they sense? lbc

Thanks, HMike. I will give Edmond's Optics a look see. I happened to see a laser distance measuring tool at Lowe's a while back. It sold for around $90 and used an "eye-safe" laser. The box said it could measure distances from 2 inches to 130 feet. I thought that might be something we could...

Thanks, HMike. I was thinking we could maybe make a simple distant measurement device -for instance bounce the laser off a distant wall, or maybe try bouncing off water or do some reflection/refraction through water. Right now just trying to get ready for the updoming science fair season with...

Can anyone suggest a source for some photo-diodes that I can use to detect reflections from the cheap, toy laser pointer pens (650nm). I'd like to use these laser pens and photo-diodes for science fair projects for my grand kids. Any suggestions will be sincerely appreciated. LBC

Sorry for the delay in acknowledging everyone's responses. I don't spend much time on my computer. Usually only several times a week for an hour or so. I will check this forum when I do get on the computer. Thanks to all for the quick and understandable answers. After looking at ads for...

I am interested in conducting some tests of laser baseball speed detectors. Does anyone know of sources for these detectors? What is the wavelength they use? What type of photo detector diode could I use to detect their signals? Thanks, lbc