Tell us about yourself!
Pavelkh,Lasers are not 'one-size-fits-all'. One criterion is their coherence length - this is the distance over which the laser light is coherent (and therefore can produce interferencde).But having said that, I'm very surprised that even a simple laser pointer wouldn't be sufficiently coherent.For the record, I bought this one from Roithner Lasertecnnik in Vienna. But it's nothing special - 2mW, glass lenses - but certainly not 'laboratory' grade.:(Wish that I could be more helpful!