Laser light generator

Details Laser light generator Laser light generator

1997-02-11

1998-06-23

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Optical output stabilization

372 26, 372 38, H01S 313

Patent

active

057712557

ABSTRACT:
A laser light generator includes an adder 12 which adds an optical frequency modulation signal Sm onto a d.c. voltage for driving a laser diode 10 for continuous laser oscillation, and applies the sum signal to the laser diode 10 to drive it. An light output from the laser diode 10 is introduced to an optical intensity controller 14 that is controlled by a control signal prepared by adjusting the optical frequency modulation signal Sm both in phase and in amplitude by a phase adjusting circuit 16 and an amplitude adjusting circuit 18. The optical intensity controller 14 may be an electroabsorption modulator that changes its transmissivity in response to an output voltage of the circuit 18. Quantities of adjustment by the circuits 16 and 18 are determined so that fluctuation in transmissivity of the optical intensity controller 14 suppresses intensity fluctuation of the light output of the laser diode 10.

REFERENCES:
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patent: 5227908 (1993-07-01), Henmi
patent: 5317577 (1994-05-01), Urakami et al.
patent: 5515196 (1996-05-01), Kitajima et al.
L. Eskildsen, et al., "Residual Amplitude Modulation Suppression Using Deeply Saturated Erbium-doped Fiber Amplifiers", IEEE Photon. Technol. Lett., vol. 7, No. 12, pp. 1516-1518, 1995.

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