... output power for your choice:laser 640nm(150-200mw)laser 640nm(200-400mw)laser 640nm(500-600mw)laser 640nm(1000mw)laser 640nm(2-7w) Application ... holography, fluorescence ,sensors ,Raman spectrum ,spectrum analysis,communication,chip inspection,laser display, laser TV,interference ,measurements,color printing, laser detection ,laser medicinal,etc. Specification