On Tue, 07 Apr 2009 10:56:22 -0400, Phil Hobbs
<(E-Mail Removed)> wrote:
><snip>
>I usually use this trick with quad cells, to make beam pointing
>indicators whose readings are insensitive to beam power. Works great,
>and you get the calibration and temperature compensation free.
Quad detectors are found useful in so many ways. I really appreciated
their use in CD players (and I assume in most optical disc readers)
where astigmatism used with 45-degree rotated quad detectors make
staying in focus a beauty to behold.
Jon
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