Laser apparatus

Details Laser apparatus Laser apparatus

2006-06-19

2008-09-16

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular beam control device

Tuning

C372S019000, C372S032000

Reexamination Certificate

active

07426222

ABSTRACT:
A laser apparatus is disclosed. An optical element receives at least a part of laser light emitted from a laser generation source and generates interference fringes. Each of first and second two-divided detectors has two detectors arranged in the direction of which the interference fringes appear. Each of the detectors detects an amount of light of the interference fringes. These two-divided detectors are spaced apart for an odd-number multiple of nearly ¼ period of interference fringes and disposed on a plane perpendicular to an optical path of the interference fringes. Each of first and second calculation sections calculates a first difference signal of detection signals of two detectors of the two-divided detector. A selection section selects one of the first and second difference signals. A determination section determines a wavelength of the laser light corresponding to a value of the difference signal selected from the first and second difference signals.

REFERENCES:
patent: 2002/0122444 (2002-09-01), Tsai
patent: 2003/0108071 (2003-06-01), Hedin et al.

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