The really old one is way better--it's by the guy that invented light and electrons and silicon and everything. ;)
Cheers
Phil Hobbs
Oh, no you don't! The discussion was about AC and synchronous detection, the '3dB penalty' in bandwidth is of no importance because the detector rejects the out-of-phase part of the bandwidth in question. You get the
3 dB back, it never hits the measurement.
Quite right. I corrected that mistake earlier today, actually.
Cheers
Phil Hobbs
reference
the
or
Nice article. It seems that the doubly rotated AT "DRAT" crystals from = my teen years were early versions of SC crystals.
?-)
Got the first boards today:
Don't know if it works, but the orange LED is sure pretty. My camera made it look kinda yellow.
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John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Whatsitdo ??
It's a laser driver. The seven square pads solder to one side of a
14-pin butterfly laser package. This board has a one-shot to make pulses from 100 ps up to a couple ns maybe, and pots/inputs to adjust pulse width, laser bias, and laser pulse current. It's pretty common these days to have a seed laser run at a few hundred mA to make a fast light pulse, then run that through a few pumped-fiber amplifiers to get enough optical power for materials processing or some such.Have something to add? Share your thoughts — no account required.
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