External cavity semiconductor laser light source

Details External cavity semiconductor laser light source External cavity semiconductor laser light source

1998-09-18

2000-11-07

Font, Frank G.

Coherent light generators

Particular beam control device

Tuning

372 29, H01S 310

Patent

active

061446785

ABSTRACT:
An external cavity semiconductor laser light source which comprises: an external cavity semiconductor laser light source unit; an optical filter for selecting an output beam of the external cavity semiconductor laser light source unit in a single mode; a drive unit for varying a wavelength of a transmitted light or a wavelength of a reflected light, from the optical filter; a wavelength control unit for controlling the drive unit; an optical frequency reference light source for generating a light having a reference optical frequency; an optical frequency/voltage conversion unit for generating a signal which corresponds to a difference in optical frequency between the light outputted from the optical frequency reference light source and the output beam of the external cavity semiconductor laser light source unit; a low pass filter for transmitting a low-frequency component of the signal of the optical frequency/voltage conversion unit; a switch for feeding the signal into the external cavity semiconductor light source and for interrupting the signal; and a frequency control unit for switching on and off the switch to control the drive unit.

REFERENCES:
patent: 5161165 (1992-11-01), Zorabedian
patent: 5570221 (1996-10-01), Fujita
patent: 5943352 (1999-08-01), Fee

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