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From: lambert@boring.uucp (Lambert Meertens)
Newsgroups: net.physics,net.astro.expert
Subject: Re: FP inretforometer
Message-ID: <6743@boring.UUCP>
Date: Mon, 27-Jan-86 16:07:57 EST
Article-I.D.: boring.6743
Posted: Mon Jan 27 16:07:57 1986
Date-Received: Thu, 30-Jan-86 01:55:08 EST
References: <1917@saber.UUCP> <1949@pur-phy.UUCP>
Reply-To: lambert@boring.UUCP (Lambert Meertens)
Distribution: net
Organization: CWI, Amsterdam
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Xref: watmath net.physics:3793 net.astro.expert:196
Apparently-To: rnews@mcvax

>>I just heard a discussion of a Fabre Preot interformeter. It involved the
>>use of 2 mirrors that had 95 % reflectance and 5 % transmission they were
>>set up parrellel to each other and a given number of wavelengths apart.
>>It was stated that if this device was raidated with 1 watt of light at that
>>waveleignth the output at the other end would be 1 watt. And that there would
>>be 20 wats of energy raidateing back and forth between the mirrors.
>>Is this realy true and if so how does it work????

> That's Fabry-Perot interferometer. For a full description see
>Jenkins and White. To explain in brief, an interfermometer acts as
>a RF resonance cavity. The energy between the mirrors is stored as
>a standing wave. The ratio of stored energy to radiated energy is
>the "Q". This all makes sense to anyone with an EE backround. I have
>a hell of a time explaining it to particle physicist however. If
>you want to know more, come to Purdue and take my couse in optics.

To unsterdand hwy teh Farby-Perto inferthermometer sttores 20 what you dont
need a baground in EE.  Pur unit of time you put in 1 freeble of enrgy and
outcomes 5% off watt is stored, so if thats less than 20 freebles it
incresaes and if more it dinimishes, so it setless on 20 only its not wats
but freebles (the dimension of "Watt" is energy/time) and to obtain the
energy you have to multiply 20 W by the time it takes the wave to move from
one end to the other, which is not much.
-- 

     Lambert Meertens
     ...!{seismo,okstate,garfield,decvax,philabs}!lambert@mcvax.UUCP
     CWI (Centre for Mathematics and Computer Science), Amsterdam