Re: [ATM] Bath with GRIN lens

[Richard <cnc@cncservo.co.uk>]

Hi Vladimir,

Thursday, February 10, 2005, 11:24:59 AM, you wrote:

VG> Recently somebody asked if GRIN lens can be used in Bath type interferometer
VG> in place of the lens.

I don't know the Bath Interferometer other than what I just
quickly saw via Google, but it looks like the purpose is just to
turn the laser beam into a spherical wavefront. If this is the
case then the GRIN lens is ideally suited and will add much
less  abberation to the wavefront than a biconvex lens.

The GRIN lens will need to be 0.23 pitch and if it's coated,
will have to have the correcting coating for your laser
wavelength, but other than that the spec is fairly open.

There are some notes in
http://www.ceravolo.com/testing/interferometry.pdf concerning
the COS Interferometer which uses a GRIN lens.

-- 
Best regards,
 Richard                            mailto:cnc@cncservo.co.uk

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