Coherent light generators – Particular beam control device – Mode locking
Patent
1992-11-24
1994-11-15
Gonzalez, Frank
Coherent light generators
Particular beam control device
Mode locking
372 6, 372 94, H01S 3098
Patent
active
053655311
ABSTRACT:
A figure-8 loop laser having a controllable phase shifter in a Sagnac loop (non-linear amplifying loop mirror). A half-wave plate in series with Faraday optical rotators provide a switchable non-reciprocal 180-degree phase shifter that allows the birefringence of the fiber loop to be adjusted during continuous wave operation. The phase shifter is activated during continuous wave operation to find a minimum threshold and then is turned off, placing the laser in optimum state for mode locking.
REFERENCES:
patent: 4323310 (1982-04-01), Shaw et al.
patent: 5050183 (1991-09-01), Duling, III
Irl N. Duling III, "All-Fiber ring solition laser mode locked with a nonlinear mirror", Optics Letters, vol. 16, No. 8, Apr. 15, 1991, pp. 539-541.
Masataka Nakazawa et al., "Low threshold, 290 fs erbium-doped fiber laser with a nonlinear amplifying loop mirror pumped by InGaAsP laser diodes", Appl. Phys. Lett. 59, Oct. 21, 1991, pp. 2073-2075.
D. J. Richardson et al., "Selfstarting, Passively Modelocked Erbium Fibre Ring Laser based on the Amplifying Sagnac Switch", Electronics Letters, vol. 27, No. 6, Mar. 14, 1991, pp. 542-543.
Donald David K.
Lin Hong
Sorin Wayne V.
Gonzalez Frank
Hewlett--Packard Company
Kee Pamela L.
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