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From: ins_atge@jhunix.HCF.JHU.EDU (Thomas G Edwards)
Newsgroups: sci.electronics,sci.optics
Subject: Re: IR source (loose)
Summary: IR Lasers
Message-ID: <7929@jhunix.HCF.JHU.EDU>
Date: 8 Apr 91 05:12:07 GMT
References: <1991Apr3.211135.21492@syssoft.com> <1991Apr6.182801.25556@ux1.cso.uiuc.edu>
Followup-To: sci.electronics
Organization: The Johns Hopkins University - HCF
Lines: 16

In article <1991Apr6.182801.25556@ux1.cso.uiuc.edu> frerichs@ux1.cso.uiuc.edu (David J Frerichs) writes:
>I need an IR source (800 nm) that produces a beam about 1ft by 1in at
>a distance of about 1.5m with the intensity equal to the center of
>a flashlight bulb beam.

Solid-State IR Lasers are to be had for fairly cheap prices (some $20 
and down)...you will probably need to build a current-limiting 
device to keep the output intensity down to the 0.01 mW range for what
you are trying to do.  Use an IR passing lens or curved mirror to
provide the excess divergence.  (Warning...do not look into laser
with remaining eye).

Otherwise, for saner less dangerous missions, Edmund Scientific sells
IR Passband filters which you can put on a very bright floodlamp.

-Tom