Ring laser employing unidirectional attenuator

Details Ring laser employing unidirectional attenuator Ring laser employing unidirectional attenuator

1992-09-18

1994-01-04

Bovernick, Rodney B.

Coherent light generators

Particular resonant cavity

Folded cavity

372 6, 372 18, 372 27, 359483, 385140, H01S 3083, H01S 3098, G02B 626

Patent

active

052767019

ABSTRACT:
A mode locked fiber ring laser comprising an optical fiber, an output mirror, a partially reflective/partially transmissive mirror and a unidirectional attenuator. The unidirectional attenuator comprises, in sequence, a first linear polarizer, with its polarization axes at 0.degree., a first quarter wave plate with its axis at .theta..degree., a non-reciprocal rotator for rotating the polarization of incident light by .gamma..degree., a second quarter wave plate with its axis accented at (.theta.+.gamma.+90).degree. and a second linear polarizer with its polarization axis at .gamma..degree.. The parameters .theta. and .gamma. are selected to provide a desired relative phase shift between counter-propagating beams in the fiber and to attenuate the beam in one of the directions so as to create an additive pulse mode-locked (APM) type passive mode locking system.

REFERENCES:
patent: 4973120 (1990-11-01), Jobson et al.
patent: 5050183 (1991-09-01), Duling, III

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