Recent content by marks

can you place a filter over a laser? to get the right wave length of beam? I would prefer a chemical reaction of some kind, as photoluminescence does not last? mark

HI from 5 metres to as far as possible, obviously ther will be a limit. To a count of 3 to 5 sec if possible. The size of the beam, precise and visible mark. power low- must be effected by 630-670nm only give 20-30nm. I was thinking either chemical reaction or photoluminescence. Plastic film...

I am trying to produce a piece of paper which is coated which is not effected by daylight but when a light wave of 630-670nm is pointed at it will leave a permanent mark i.e. black dot on white background. Can you advise me how I could achieve this or if you could guide me in the right...