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so i tested it with a remote for LED-strips and my phone-camera since it sees IR. it is a IR filter. the IR light is blocked good.

So recently i opened my broken green laser pointer since i already got a new one. I was interested of what is in there and what broke. It was the lasercrystal fallen off. But i found a black thing in the area where the laser crystal was. The black thing has something like a thin slice of glass...

Lol my pen laser looks really similar

So i got a laser from the web. Its a renkforce rf-lp-500. This is, like the most green laserpointers, a dpss laser. It claims to be a class II laser with max output power <1mW but when its really dark, like its night and you have no light on in your room, i can see the laserbeam. Its really hard...

Exactly.

Ofcorse not.

I think these keychain-laserpointers are geat beginnter laser pointers. My first one was a keychain laser pointer i got from the funfair (or "kirmes" as we say here in germany). These laser pointers are so weak, you wont get any eye damage even if you point it right into you eye if, of course...

Look at the "caution" and the "danger" sign.

do you put keychain laserpointers on you keys?

how to focus a cheap green laser pointer pen to have a smaller dot? maybe with a magnifying glass?

Same with the pen styled laser pointers

Who created it? Which brand has sold it?

As we all know these laserpointers are made from tons of chinese companys now. But there has to be someone who came up whit this idea. Who "invented" them? Which company was the first one that sold them?

renkforce Laserpointer RF-LP-500

I honestly don't think my green laser has a green diode but i would love to see if there is a method to see if it's true. So, ist there any method (preferably without disassembling into the individual parts)

Like with colored glass or something like that.

No. I like them. They make the laser pointer look more dangerous.