Focusing lens

[yuval12321]

Hi,

I was told once laser lens have two sides and if I insert it in the wrong side it reflects more light and kills the diode. So I was wondering - is it a problem if I overfocus a laser (in which the lens are in the right side)? I mean for example that after I focus the laser to get a single tiny dot then I screw the len more so it gets closer to the laser diode and the dot starts growing again.

Thanks,
Yuval

 

[Eudaimonium]

You have been told wrong on both accounts.

Putting the lens in the wrong way just gives you a weird dot, nothing more.