Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuji Kotaki1
Kazumasa Takabayashi1
Ken Morito1
Date of Patent
October 31, 2006
1Patent Application Number
108106011
Date Filed
March 29, 2004
1Patent Primary Examiner
Patent abstract
There is provided a phase control portion for controlling phase of a laser beam resonated in a resonator based on detected results by two optical detectors. The phase control portion adjusts the longitudinal mode positions by a feedback control so that a ratio of intensities detected by the two optical detectors comes to a predetermined reference value. To one of the optical detectors, part of a laser beam outputted from the resonator is irradiated as it is, whereas, to the other one of the optical detectors, part of the laser beam outputted from the resonator is irradiated after passing through an etalon. An FSR of the etalon is a double of that of another etalon in the resonator.
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