Converting a 780nm to a 658nm 100mW+ single mode extended cavity laser

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my own ECDL setup

A friend had pulled in a pile of nice externel cavity diode lasers that run at 780nm, made for spectroscopical purposes, and hat given me one - thanks geso! Of course I had to convert it to a visible light, single longitudinal mode ECDL on the same day I got it. Here are a few remarks and observations that should help others to convert and operate this type of lasers.

Note added: I got another of such lasers, and the driver board of that one seems 100% intact. It worked out of the box, however the max diode current it can supply was just 84mA. I still need to find out why there is a discrepancy with the other board.


Finally I have put together a complete working unit, it doesnt look particularly nice but it works well:

I added a copy of my proven driver board, and at the inside, I replaced the aluminum turning mirror by a high-efficiency dielectric mirror, and added a noise detector circuit including a Brewster beam sampler at the output window:


Things are quite tight and one needs to take away the plastic shell for adjusting the grating.


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Vers. 1.1-03/10