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From: Phil Hobbs
Subject: Re: laser diode operating range
Date: Wed, 20 Nov 2002 16:09:51 -0500
Organization: IBM T. J. Watson Research Center
References: <3DD9B41E.A6D85CCB@webaccess.net> <3DDA6E5D.EAB572C6@SpamMeSenseless.us.ibm.com> <3DDAECF1.F1412F2F@webaccess.net>
NNTP-Posting-Date: 20 Nov 2002 21:09:52 GMT
X-Mailer: Mozilla 4.61 [en] (OS/2; U)
Chuck Simmons wrote:
> Aside from communications, you are pushing way outside the usual range
> of use of diode lasers the bulk of which seem to be consumed in consumer
> products. Communications does not precisely depend on coherence and that
> is rather good because laser diodes are pretty poor as coherent light
> sources comparatively. The common consumer products that use laser
> diodes need a much narrower line than can be had with a bright LED
> source but they tolerate mode hopping which is a disease of lasers in
"Outside the usual range of diode lasers"? I invite you to try building
a CDROM drive or a printer using a tungsten source. Do you really think
that laser pointers are the largest application of diode lasers?
I don't think you understand the distinction between temporal and
spatial coherence. The two are almost completely unrelated.
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