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I work primarily on the mouse. I installed my microscope with a dark part and a 
bright part (natural) to my surgeries. I had to create a black heated around my 
upright microscope box. I have all the references to build oneself. I also modify 
the plate to accept the sample. The walls were painted dark blue mat. But 
anyway your laser should never leave the safety casing. Know that dark walls 
absolutely no protection from parasites and dangerous reflections pulsed 
infrared lasers. My Systems: Zeiss Maitai.
I'm building  a 2P + OPO. Coherent.