From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Diode Laser Drive Circuit
Date: Mon, 11 Nov 2002 23:33:20 GMT
NNTP-Posting-Date: Mon, 11 Nov 2002 15:33:20 PST
Bill Sloman wrote:
> "Alex Cusenza" wrote in message
> > Hello,
> > It's been a while since I posted, but I'm always peaking for interesting
> > articles.
> > Anyway, can someone please explain to me how a driver board functions for
> > laser diode. I have a simple differential feedback circuit (very typical)
> > connected with a potentiometer connected to the laser input. As I vary
> > potentiometer, the laser beam varies from dim to bright. WHY? Then, what
> > is the purpose for a more fancy driver circuit, that is, higher frequency
> > operation and such?
> > Your input is greatly appreciated.
> The most important bit of information you need to know about laser diodes is
> that it is very easy to blown them up.
> The active region is tiny and a few usec of over-current can convert your
> expensive laser diode into junk silicon.
> Do a search of sci.electronics.design on groups.google.com - the subject has
> come up before, and one of our reguar posters has a useful web-site.
I did myself mention the overcurrent problem but as important is the
handling problem. Laser diodes are almost unbelievably ESD sensitive.
Extreme care must be taken until the laser diode is connected into a
circuit and is more or less safe.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org