Path: utzoo!utgpu!watserv1!watmath!att!att!linac!uwm.edu!zaphod.mps.ohio-state.edu!samsung!munnari.oz.au!uhccux!bigtuna!pegasus!richard
From: richard@pegasus.com (Richard Foulk)
Newsgroups: sci.electronics
Subject: Re: lasers, portable, RE
Keywords: oops... see above
Message-ID: <1990Nov3.160354.19429@pegasus.com>
Date: 3 Nov 90 16:03:54 GMT
References: <1990Oct25.155555.7745@wam.umd.edu> <1990Oct25.222852.23490@Solbourne.COM>
Organization: Pegasus,  Honolulu
Lines: 20

>>2. Discouraged, I was prowling around in a catalog that had been packaged
>>with the magazine, and found some other company selling 2mw visible red
>>laser diodes for $19.95. Hmmm. I dont know a whole lot about laser diodes.
>>Does the thing just spontaneously start lasing when you exceed the I(th)
>>, or do you have to give them high current pulses, like the older IR
>>laser diodes? (As near as I could tell, the RE thing was just a constant
>>current supplier with a feedback loop through the photodiode integral to
>>the laser diode.) If thats the case, I think Id just get one and start messing
>>around...  
>
>The less expensive laser diodes operate at 780nm versus the expensive
>which operate at 665nm. The 665nm is a much more visabe red beam.

The distressing thing about the Radio Electronics (10/90) construction
article is that it didn't state what the wavelength of the Toshiba
TOLD-9200 laser diode was.  All they say is that it's visible.


-- 
Richard Foulk		richard@pegasus.com