Re: Optics design reference

From: Phil Hobbs (pcdhSpamMeSenseless_at_us.ibm.com)
Date: 06/16/04 

Date: Wed, 16 Jun 2004 10:01:11 -0400

Alessandro Del Bianco wrote:
> Ted Phares wrote:
>
>> Hi,
>>
>> Can anyone suggest a reference that touches on basic optical system
>> design techniques?
>
>
> Warren J. Smith, Modern Optical Engineering McGraw-Hill
> Donald O'Shea, Elements of modern Optical Design, Wiley Interscience
>
>> I'm working on a design project that requires relatively compact
>> optics capable taking as input a 3" diameter beam (consisting of
>> approximately parallel rays) and concentrating it down to a 1"
>> diameter beam (again, consisting of approximately parallel rays). The
>> application is a light concentrator for a very high intensity portable
>> light source.
>
>
> A telescope with a 3X magnification ratio will do the job. You can build
> with catalog lenses without difficulties.
>
> You can also look for beam expanders and use them reversed. Care that
> the divergence of the beam will increase when you concentrate the beam.
>
>> I'm wondering if this is a common problem for which a usual design
>> approach is taken.
>
>
>
>
But make sure you keep an eye on the thermodynamic limit. As Alessandro
points out, reducing the beam diameter by 3x will increase its divergence by
3x. You can show this from geometric optics, but it follows very generally
from the second law of thermodynamics--if you could reduce the beam diameter
without a corresponding increase in divergence, you could build a system in
which heat spontaneously flowed (via radiation) from a colder object to a
hotter one--a perpetual motion machine.

Cheers,

Phil Hobbs

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