Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1996-06-03
1998-06-23
Davie, James W.
Coherent light generators
Particular beam control device
Optical output stabilization
H01S 310
Patent
active
057712549
ABSTRACT:
An integrated laser-based light source that generates an output light beam having a controlled intensity. The light source comprises a package in which are mounted a laser, a light sensor and a coupler. The laser has one and only one light-emitting face from which a light beam is radiated as a radiated light beam. The light sensor generates an electrical signal representing the intensity of light energy falling it. The coupler couples a fraction of the radiated light beam to the light sensor, and provides the remainder of the radiated light beam as the output light beam. Since the light coupled to the light sensor by the coupler is a fraction of the radiated light beam, the electrical signal generated by the light sensor also represents the intensities of the radiated light beam and of the output light beam. A suitable control circuit, when fed with the electrical signal generated by the light sensor, can control the laser current to hold the electrical signal generated by the light sensor to a predetermined value that corresponds to the output light beam having a predetermined intensity.
REFERENCES:
patent: 4733094 (1988-03-01), Carpentier et al.
patent: 4760569 (1988-07-01), Mahlein
patent: 5247167 (1993-09-01), Bargerhuff et al.
patent: 5432537 (1995-07-01), Imakawa et al.
patent: 5579328 (1996-11-01), Habel et al.
Baldwin Richard R.
Corzine Scott W.
Ertel John P.
Holland William D.
Larson Leif Eric
Davie James W.
Hardcastle Ian
Hewlett--Packard Company
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