Laser light source apparatus

Details Laser light source apparatus Laser light source apparatus

1999-01-13

2000-11-07

Epps, Georgia

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250206, 372 9, 372 12, 372 23, G01J 350

Patent

active

061440256

ABSTRACT:
The light emitted by a laser diode 1 is entered into a beam splitter 5, and its reflected light is given to an optical band pass filter 8. The light passing through the optical band pass filter 8 is received by a photo diode PD1.
The light once reflected by the optical band filter 8 and passing through the beam splitter 5 is received by a photo diode PD2. The reception ratio of the photo diodes PD1, PD2 is calculated in output ratio calculator 9. By controlling the emission wavelength of the laser diode 1 so that its ratio may be constant, laser light of high precision and stable wavelength is emitted.

REFERENCES:
patent: 4957362 (1990-09-01), Peterson
patent: 5715269 (1998-02-01), Shinji
patent: 6046810 (2000-04-01), Sanders et al.

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