Joseph Webster asks: >Any ideas for measuring the power of 488 & UV separately in multi line? > (yes, I have a power meter) > Dichroics are available with >95% transmission at 488 and >95% reflectance in the UV; I and others have used them to split the UV and blue output from dual-wavelength He-Cd lasers. Since the 488 output is typically substantially greater than the UV output in dual-wavelength operation of an argon laser, measuring what passes through the dichroic will probably give you a good approximation of the 488 nm output. For the UV, you probably want to look at a beam reflected off at least two such dichroics; three or four might be better. You can calculate the losses from the curves provided by the manufacturer (I got my dichroics from Omega). Also remember that diode power meters are much less sensitive to UV than to 488, while thermal power meters, which used to be what was supplied with big lasers, are approximately equally sensitive. -Howard
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