COHERENT OBIS 637 Laser Head 1196625 Rev. AB 639nm 140-180mWCOHERENT OBIS 637 Laser Head 1196625 Rev. AB 639nm 140180mW The Coherent OBIS 637 Laser Head is a precision engineered diode laser module designed for high performance scientific, biomedical, and industrial applications. Operating at a wavelength of 639 nm, this laser delivers stable and efficient red light output with power levels ranging from 140 to 180 mW, making it ideal for fluorescence excitation, imaging systems, and analytical instrumentation.