Coherent light generators – Particular resonant cavity – Specified cavity component
Reexamination Certificate
2008-03-14
2009-12-08
Nguyen, Dung T (Department: 2828)
Coherent light generators
Particular resonant cavity
Specified cavity component
C372S099000, C372S029011
Reexamination Certificate
active
07630426
ABSTRACT:
A wavelength detector detecting a change of a wavelength of a laser light with high accuracy, such that the wavelength detector includes a diffraction grating diffracting a laser light, photodetectors positioned symmetrically with respect to a 0-order diffracted light diffracted by the diffraction grating, and respective light incidence surfaces of the photodetectors that have a same shape and that are divided into a plurality of areas. The wavelength detector detects the change of the wavelength based on a value obtained by dividing a difference between (i) a sum of light intensities measured by all of the plurality of divided areas of a first photodetector and (ii) a sum of light intensities measured by all of the plurality of divided areas of a second photodetector, by a sum of light intensities measured by all of the plurality of divided areas of both photodetectors.
REFERENCES:
patent: 5691989 (1997-11-01), Rakuljic et al.
patent: 62-5677 (1987-01-01), None
patent: 2006-32397 (2006-02-01), None
patent: 2006-324371 (2006-11-01), None
Kadowaki Shin-ichi
Nakayama Kenji
Nguyen Dung T
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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