Error signal generation system
First Claim
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1. A system, comprising:
- a gain medium to emit an optical beam along an optical path;
a reflective element positioned in the optical path to feedback a first portion of the optical beam to the gain medium;
a tunable element positioned in the optical path to receive the optical beam and to select a lasing frequency of the gain medium, the tunable element further to diffract the optical beam to generate a constructive interference fringe; and
a first optical detector positioned to receive the optical beam and the constructive interference fringe, the first optical detector to generate a first error signal in response the constructive interference fringe.
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Abstract
An error signal generation system and method for continuous and accurate positioning of a tunable element used in association with a coherent light source. A tunable element is positioned in a coherent light beam with a fixed frequency or wavelength, and a detector is positioned in association with the light beam and tunable element that is capable of generating an error signal indicative of spatial losses associated with the positioning of the tunable element in the light beam. A tuning assembly is operatively coupled to the tunable element and detector and is configured to position the tunable element according to the error signal generated by the detector.
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Citations
32 Claims
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1. A system, comprising:
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a gain medium to emit an optical beam along an optical path;
a reflective element positioned in the optical path to feedback a first portion of the optical beam to the gain medium;
a tunable element positioned in the optical path to receive the optical beam and to select a lasing frequency of the gain medium, the tunable element further to diffract the optical beam to generate a constructive interference fringe; and
a first optical detector positioned to receive the optical beam and the constructive interference fringe, the first optical detector to generate a first error signal in response the constructive interference fringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
a second optical detector positioned to receive a second portion of the optical beam and to generate a second error signal; and
a drive current controller operatively coupled to the gain medium to adjust a drive current applied to the gain medium in response to the second error signal.
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22. A method, comprising:
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generating a coherent optical beam directed along an optical path;
selecting a wavelength of the coherent optical beam;
diffracting the coherent optical beam to generate a constructive interference fringe; and
generating an error signal in response to the constructive interference fringe. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification