Very low absorption, low efficiency laser beamsampler

Details Very low absorption, low efficiency laser beamsampler Very low absorption, low efficiency laser beamsampler

1980-01-21

1981-08-04

Corbin, John K.

350166, 350171, G02B 518, G02B 508

Patent

active

042818940

ABSTRACT:
A very low absorption beamsampler for diffracting a very small fraction of a laser beam while specularly reflecting substantially all of the main beam with minimal absorption. The beamsampler comprises a plane mirror surface coated with a high-reflectivity multilayer dielectric coating, the topmost dielectric of which is grooved into a grating and coated with a transparent dielectric having a refractive index very similar, but not the same, as the grooved layer to form a weak phase grating for diffracting a weak first order sampling beam.

REFERENCES:
patent: 3767310 (1973-10-01), Dickson
patent: 3861801 (1975-01-01), Peters et al.
patent: 4114978 (1978-09-01), Bostick et al.
Elson, J. M., "Infrared Light Scattering from Surfaces Coated with Multiple Dielectric Overlayers", Applied Optics, vol. 16, No. 11, pp. 2872-2881, Nov. 1977.

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