Ray Lannigan wrote- > I just bought a 17mW 635nM HeNe from Coherent that went into a Facscan. >The tube and power supply were reasonably priced and performed well. Higher >power tubes are also available. You also may want to check out Power >Technology's line of laser diode modules. The link to the table of available >modules is http://www.powertechnology.com/LDINFO/DIOLIST.ASP . The ones >listed on this page have elliptical beams, so you may want to talk to them >about getting a circular beam output. And I just got a 25 mW 635 nm diode system with a circular beam from Power Technology; I haven't had a chance to test it extensively but I've had pretty good luck with their lower power circular beam systems, and the 25 mW has a thermoelectric cooler (same package they use for the violet diodes), which should minimize mode hop noise. The system was under $2,000. -Howard
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