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Unless it's specifically machined (or a sleeve machined for it) it will be tough to align without some kind of screws or other alignment devices.

Wow! I'm surprised they could even communicate with you, unless you know Mandarin. Chinese Junk used to be the name of a type of ship, now it just means most electronics.

Years ago when I sold electronics, a guy asked for low power red laser diodes. He said he was using them for medical treatment. I started to say, "are you sure-" and he interrupts me and says, "No, they won't make you grow extra fingers, or deform you.." So I told him, "Uh, that's not what I...

Thank you for the reply! BTW, where do you get drivers for the 445nm diodes you have?

The laser responds to the initial high voltage pulse, but will not lase afterwards. Power supply, or tube?