Laser wavelength control device

Details Laser wavelength control device Laser wavelength control device

1997-05-08

1999-08-24

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 372 34, H04B 1004

Patent

active

059431520

ABSTRACT:
A laser control system is disclosed including a microprocessor, which precisely adjusts the wavelength of light output from the laser by monitoring the transmissivity of an in-fiber Bragg grating coupled to the output of the laser. The Bragg grating is fabricated to have a minimum transmissivity at the desired output wavelength of the laser. The microprocessor continually adjusts the wavelength of the laser output to obtain substantially minimal transmissivity through the grating. At which point, the laser is locked to the desired wavelength. Alternatively, the microprocessor can monitor light reflected from the grating, and continually adjust the wavelength of the laser output to lock the laser at a wavelength providing substantially maximum reflectance by the grating.

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