From: Chuck Simmons
Organization: You jest.
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Subject: Re: Photodiodes in photovoltaic mode, speed considerations.
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Date: Wed, 16 Oct 2002 14:38:05 GMT
NNTP-Posting-Date: Wed, 16 Oct 2002 07:38:05 PDT
John Fields wrote:
> On Wed, 16 Oct 2002 12:26:22 GMT, Chuck Simmons
> >BTW, the reason I want to select the clock before powering a type of
> >laser is because the lasers are easy to burn out. I have piles of dead
> >ones some of which are victims of the clock being set too fast for them.
> >Most of the other dead ones seem to be ESD failures but that's another
> Would it not be possible, using a known safe pulsed input to the
> laser, to measure the response time of the detector and use that
> information to select your clock?
In the cases where I design the power driver, I can manage that assuming
I can decide what safe means. The dead pile suggests that safe might be
a bit hard to define for some lasers. I think that most lasers are
"safe" at 50% above typical threshold. I have a new one coming in a day
or so where I have jumpers on my adapter that allow disconnecting the
power driver from the power control. I can try on that one I think.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org