Laser multiple feedback control circuit and method

Details Laser multiple feedback control circuit and method Laser multiple feedback control circuit and method

1992-07-06

1993-10-12

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 31, 372 29, H01S 300

Patent

active

052532674

ABSTRACT:
A method and apparatus for reducing the effects of relative intensity noise in a diode laser system by sensing the light output of diode laser system and producing an electrical feedback signal; amplifying the feedback signal over at least two different parts of a frequency band that includes the Relaxation Oscillation Frequency of the laser system; shifting the phase of each of the amplified feedback signals over the frequency band; and superimposing onto the current supplied to the laser diode a current signal that is a function of each of the phase shifted and amplified feedback signals.

REFERENCES:
patent: 4672192 (1987-06-01), Muka et al.
patent: 4847477 (1989-07-01), Smith
patent: 5177755 (1993-01-01), Johnson
Thomas J. Kane, "Intensity Noise in Diode-Pumped Single-Frequency Nd:YAG Lasers and its Control by Electronic Feedback", Photonics Technology Letters, vol. 2, No. 4, Apr. 1990.

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