Mode-locked fiber laser having an optical path length controller

Details Mode-locked fiber laser having an optical path length controller Mode-locked fiber laser having an optical path length controller

1995-11-15

1998-01-13

Lee, John D.

Coherent light generators

Particular beam control device

Mode locking

372 6, 372 25, H01S 3098

Patent

active

057086702

ABSTRACT:
The pulse repetition frequency of an optical pulse generator built with a fiber laser (LAS) is synchronized to a fixed clock frequency (fc). The synchronization is accomplished via means (M) for changing the optical path length of the resonator (RES), which is controlled by a signal from a control device (RE). The criterion for the synchronization is the effective value of an interference signal superimposed on the signal light, which increases with increasing deviation of the pulse repetition frequency from the clock frequency. A portion of the output signal (A) of fiber laser (LAS) is optically/electrically converted by the control device (RE), and the effective value of the interference signal is determined by filtering and rectifying the electrical signal obtained in this manner. After subsequent amplification and regulation, the control signal for the means (M) to change the optical wavelength is obtained. The control signal is additionally modulated with a wobble signal, so that the pulse repetition frequency always varies around the optimum value and is synchronized in this way.

REFERENCES:
patent: 5305336 (1994-04-01), Adar et al.
patent: 5359612 (1994-10-01), Dennis et al.
patent: 5367529 (1994-11-01), Holsinger et al.
patent: 5546414 (1996-08-01), Pfeiffer
"Stabilizing Er fiber soliton laser with pulse phase locking" in the Jan. 1992 issue of Electronic Letters, pp. 182-184, vol. 28, No. 2, Shan et al.
"Dual Wavelength Pulse Generation Using Mode-Locked Erbium-Doped Fiber Ring Laser" Electronics Letters, 24 Oct. 1991, vol. 27,No. 22, 2 pp, Schlager et al.

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