Coherent light generators – Particular active media – Gas
Reexamination Certificate
2005-03-08
2005-03-08
Lee, Wilson (Department: 2821)
Coherent light generators
Particular active media
Gas
Reexamination Certificate
active
06865211
ABSTRACT:
An optical apparatus e.g. an interferometric displacement determination device: spectroscopic analysis apparatus; polarisation measurement apparatus; or a heterodyne frequency measurement device has a linear HeNe gas laser having an Ne content of an Ne20isotope and an Ne22isotope in substantially equal proportions, the apparatus in use having optical feedback toward the laser causing, 0.1% or more of the light output of the laser to be returned toward the laser (1). Use of this type of laser provides good polarisation stability even though excessive backreflection may occur, and hence the laser's frequency can be readily controlled.
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Lee Wilson
Oliff & Berridg,e PLC
Renishaw PLC
Vy Hung Tran
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