Wavelength monitor apparatus and wavelength stabilizing...

Details Wavelength monitor apparatus and wavelength stabilizing... Wavelength monitor apparatus and wavelength stabilizing...

H - Electricity

01

S

H01S 3/13 (2006.01) G02B 6/34 (2006.01) H01S 5/0687 (2006.01) H01S 5/0683 (2006.01)

Patent

CA 2351998

In a wavelength monitor apparatus, a wavelength filter whose wavelength transmission property continuously changes in accordance with an incidence angle is disposed on a laser light axis, and a transmitted light of the wavelength filter is optically connected to a light receiving element. The wavelength filter is vibrated by a piezoelectric element, and the incidence angle is slightly vibrated. An output signal from a light emitting element is supplied to a lock-in amplifier, and the lock-in amplifier uses a drive signal of the piezoelectric element as a reference signal and monitors a frequency of the output signal. A signal from the lock-in amplifier is supplied to a drive controller, and a wavelength of the light emitting element is adjusted.

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