Method of and apparatus for stabilizing output light of a curren

Details Method of and apparatus for stabilizing output light of a curren Method of and apparatus for stabilizing output light of a curren

1977-04-08

1978-05-30

Sikes, William L.

Oscillators

Molecular or particle resonant type

H01S 313

Patent

active

040926150

ABSTRACT:
A method of stabilizing output light of a current modulation laser device whose output light is changed by changing an anode current is disclosed. The method comprises detecting a part of a laser output light and converting that part of the laser output light which is detected into an electric signal, comparing said electric signal with a modulating input signal to obtain an analog signal corresponding to a difference between said two signals, controlling a gain of said modulating input signal by means of said analog signal, and feeding back said gain controlled modulating input signal to an input terminal of a laser device. An apparatus for carrying out the method comprises a partial mirror for detecting a part of said laser output light, a photodiode for converting that part of said laser output light which is detected into said electric signal, a comparison circuit connected to both said photodiode and an input terminal for receiving a modulating input signal and for comparing said electric signal with said modulating input signal to obtain said analog signal corresponding to a difference between said two signals, and a gain control circuit connected between said input terminal and the output of said comparison circuit and for controlling a gain of said modulating input signal by means of said analog signal.

REFERENCES:
patent: 3633124 (1972-01-01), Danielmeyer
patent: 3689851 (1972-09-01), Corcoran et al.

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