[Laser] HeNe modulation

[Steve J. Noll]

I just have never come up with a slick way to modulate a HeNe.
Tried again recently at work where getting 4 to 5 percent amplitude
fluctuations at a sub-Hz rate from common HeNes - this causes
great annoyance using a HeNe to do some special detector 
responsivity measurements.  Tried (again) wrapping laser with 
a coil, just not enough of an effect to counter the slow
fluctuations.  Gave up & bought a 633nm diode laser - almost
rock stable.  A stabilized HeNe is like $5000.

Tell me about what you're doing with "external fields."

Enjoyed your Fessenden link - had never heard of the guy.

Steve WA6EJO


David Riley wrote:
> 
> Its good to see some old timers gathering.
> We have a few good indoor months to get this years rig ready.
> Seems we can do some of the trip we did on 10ghz, only easier.
> Lets dream up some local qso's
> I'm fooling with full mondulation of a he-ne   any hints? So far using
> external fields..  Who cares if it takes a few watts to do the job.
> dsp ( ala ve2iq ) works well but no reaason a psk-31 via a sound card
> wouldn't do the trick too.
> The portable is here for A1 and A3 qsos, good weather coming.
> Ethernet via pc card means all the work is already done in the pc. 2 wat
> light path easiest. like a light intercomm.
> Anyone had good luck with 100mb ??  for very far??
> 
> 73s de Dave - AA1A - www.radiocom.net/Fessenden
> Stir it up Steve-Paul-Jim-et al..

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-- 
Steve J. Noll | Ventura California | sjnoll@big-list.com
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