Buffo,
I really thank you for all your advice.... Now I have no excuse... I have to continue with my experiments and make the best photo I can, as soon as my stuff are ready to lase..!!
(Meanwile I already started to dissect a 29€ 18X DVD burner to play with the diode and try to resurrect another 100mw module that died some month ago)
All the best
Luciano