Great laser, how did you connect the led to the battery? I've wanted a 1W IR since I started in the hobby. In fact my first diode was an ebay 1W IR but at that stage I was'nt even on the forum and knew nothing. I connected it to 6V and 4.5A *cringe* But hopefully in the future i'll get another one and just once again great laser +rep.
I did many tests and two plastic lenses give the best output power.
And I never noticed any damage to any of lenses.
Two plastic lenses collect more light than one (or two) glass lenses because FL of plastic lenses are a bit shorter than FL of glass lenses.
So, if you need to burn something on short distances (1.5cm) then use two plastic lenses to get better output power, and if you need to burn something on a bit longer distanced then use one glass lens.
well, i built the laser from the same parts listed above... worked at first however, within 10 minutes of very sparing use, the output was only a very faint IR ( as viewed from a camera) what could I have done wrong? also, it seems my seller sent me two 9mm diodes... one was the one i used with only 2 pins (one was connected to the case) but the second diode has 3 pins, with one connected to case and then 2 more through holes in the case. any clue what the strength of this diode is and how to connect it?