[Laser] Observing the longitudinal mode beating in HeNe lasers

[Kerry Banke]

We have two diode types we purchased that we're playing with. Neither of 
these are really high speed but fine for playing with bandwidths of less 
than 1 Ghz with lots of reverse bias. They are basic Silicon pin 
photodetectors. One type is a BPX-63 which is really a higher capacitance 
diode, and the other is a type SFH203.  In my recent experiments it seems 
the laser pointer is the limiting factor for me right now.  I need to work 
on a driver capable of driving capacitance and low impedance at higher 
frequencies.
  - Kerry N6IZW -


At 11:16 AM 7/19/2004 +0000, you wrote:
>On Mon, Jul 12, 2004 at 01:09:02PM -0700, Kerry Banke wrote:
> > I recently have been putting together an experimental wide-band optical
> > communicator using modified laser pointers and surplus pin 
> photodiodes.  We
> > purchased  a good number of very  cheap pin photodiodes locally and found
> > that by reverse biasing them to about 50 VDC they will respond beyond 1
> > GHz  & plan to make them available to laser  experimenters . I'm in the
>
>What type are these diodes?
>
>Cl<
>_______________________________________________
>Laser mailing list
>Laser at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/laser