System for measuring laser spectrum
AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsShu Yamamoto, Kiyofumi Mochizuki
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Abstract
A system for measuring laser spectrum is disclosed in which the laser light to be measured is branched into one branched light and the other branched light so that the laser spectrum of the light is measured from a beat output resulting from mixing a delayed light obtained by delaying the one branched light for a certain period of time with the other branched light undelayed. In accordance with the present invention, the delay time of the delayed light undergoes such variations as to assume a value equal to an integral multiple of a fixed delay time by the use of an optical directional coupler.
Claims4
In a system for measuring a laser spectrum in which a laser output light to be measured is branched into one light branch and another light branch and having means including a spectrum analyzer so that the laser spectrum of the output light is measured from a beat output resulting from mixing a delayed light obtained by delaying the one light branch for a certain period of time with said another light branch undelayed,
- the improvement comprising optical directional control means for optically controlling delay time of the delayed light branch by repetitive passage thereof along a constant length path thereof effective so that the delay time thereof undergoes such variations as to assume a value equal to an integral multiple of a predetermined fixed delay time effective to obtain a desired resolution of the laser spectrum.
Dependencies are inferred from the claim text.