External beam expander

Details External beam expander External beam expander

2007-10-10

2010-06-01

Le, Thong Q (Department: 2827)

Static information storage and retrieval

Addressing

Optical

C365S010000, C365S064000, C365S237000

Reexamination Certificate

active

07729199

ABSTRACT:
The invention encompasses beam expanders and methods of using such beam expanders. A beam expander according to the present invention may advantageously be used with an interferometer. Beam expanders according to the present disclosure contain at least an input and an output lens, with the output lens having a plano-convex arrangement such that the surface of the output lens is optically flat and can be used as the reference surface in a Fizeau interferometer. The beam expander may also encompass a housing, a partially reflective coating and an anti-reflective coating.

REFERENCES:
patent: 4188122 (1980-02-01), Massie et al.
patent: 5490849 (1996-02-01), Smith
patent: 5561525 (1996-10-01), Toyonaga et al.
patent: 6965435 (2005-11-01), Ina

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