Semiconductor laser controller

Details Semiconductor laser controller Semiconductor laser controller

1989-12-05

1991-07-30

Gonzalez, Frank

Coherent light generators

Particular component circuitry

Optical pumping

372 33, 372 29, 369122, H01S 300

Patent

active

050365193

ABSTRACT:
A semiconductor laser controller converts the light output of the driven laser to a photovoltaic current proportional to that light output and separates the current into high and low frequency components. A negative feedback loop controls the forward current of the laser such that the sum of these high and low frequency components of the photovoltaic current equal a reference signal current defining the light output of the laser. A control unit controls the reference current such that a voltage proportional to the low frequency component of the photovoltaic current equals a reference voltage corresponding to the reference current.

REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4771431 (1988-09-01), Nakazawa et al.
patent: 4819241 (1989-04-01), Nagano
patent: 4845720 (1989-07-01), Koishi et al.

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