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A few years ago I bought my first green laser off of ebay which was very close in looks (if not identical) to this... Stylish 5mW 5 mW 532nm Green Beam Laser Pointer Pen New - eBay (item 280572810176 end time Dec-07-10 11:53:28 PST) ...but I don't think that is who I bought it from. It was...

Yeah you've described my ebay pen. How do you know the output power of yours? Is there a way to measure it?

I bought a 5mW green pen from ebay long before I found this site. I thought it worked great. Good beam visibility and distance. Next I bought a 50mW module from O-Like. Tonight we compared them side by side and we could tell no difference. Any ideas on what is happeing? Is the O-like...

Two questions... 1. So with particles held constant the only variable is power? 2. Why is green typically visible when red is not?

What increases the visibility of a side view of a laser beam? (Without depending on particles in the air) Power? Beam width? Magic?

Should I use a heat sink for this application? If so where should I get one?

Nice! I'mm ordering one right now! Any recommendations for such a power supply? Thanks Jerry! I'll bet the FS mirrors would really make it look nice though.

I don't care about battery life or being hand held. It will be connected to an AC power supply anyway. It will be mounted on the wall so any size is ok. I hadn't got to the mirror yet but are FS mirrors a necessity?

Sorry! USA. Did you have a specific recommendation for a high duty cycle laser?

What are some options for a low power (5mW), high duty cycle (100%?) green laser? It does not need to be hand held or portable. Side view of the beam is important but I can enhance it with fog. I was thinking about building a game where kids avoid tripping a laser beam. If you trip the beam...