Continously tunable single-mode rare-earth doped pumped laser ar

Details Continously tunable single-mode rare-earth doped pumped laser ar Continously tunable single-mode rare-earth doped pumped laser ar

1993-02-01

1994-05-31

Scott, Jr., Leon

Coherent light generators

Optical fiber laser

372102, 372 69, 372 92, 385 37, H01S 330

Patent

active

053175760

ABSTRACT:
A tunable optical waveguide laser arrangement includes a solid optical waveguide capable of guiding light along an axis between axially spaced ends thereof and being at least in part of an excitable material that emits light in response to stimulation by light. Stimulating light is launched into the waveguide for axial propagation therein and attendant emission of light by the excitable material. Two end reflectors are situated in the waveguide, each at one of the axially spaced ends thereof and extending normal to the axis to delimit a laser cavity. Each of the reflectors is constituted by a Bragg grating consisting of a multitude of axially consecutive grating elements constituted by periodic refractive index perturbations with a given periodicity. The length of the cavity, the peak reflectivity of the Bragg gratings and the gain of the excitable material are so coordinated with one another as to enable lasing in only a single longitudinal mode. The length of that portion of the optical waveguide that incorporates the two Bragg gratings and an intervening region of the optical waveguide is uniformly controlledly varied with attendant continuous tuning of the laser output wavelength without longitudinal mode hopping.

REFERENCES:
patent: 4133612 (1979-01-01), Redman
patent: 4682335 (1987-07-01), Hughes
patent: 4725110 (1988-02-01), Glenn et al.
patent: 4835778 (1989-05-01), Kafka
patent: 4900119 (1990-02-01), Hill et al.

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