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US 11,815,729 B2Granted
System and method for interference fringe stabilization
AssigneeMeta Platforms Technologies, LLC
InventorsYun-Han Lee, Stephen Choi, Mengfei Wang, Junren Wang, Lu Lu, Kyle Justin Curts
Life of this patent
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Abstract
A system includes a diffractive optical element configured to receive a first beam and a second beam interfering with one another to generate a first interference pattern. The diffractive optical element is also configured to forwardly diffract the first beam and the second beam to output a third beam and a fourth beam. The third beam and the fourth beam interfere with one another to generate a second interference pattern. The system also includes a detector configured to detect the second interference pattern.
Claims18
A system, comprising:
- a diffractive optical element configured to:
- receive a first beam and a second beam at a first side of the diffractive optical element, the first beam and the second beam being configured to interfere with one another to generate a first interference pattern at the first side of the diffractive optical element;
- and
- forwardly diffract the first beam and the second beam to output a third beam and a fourth beam at a second side of the diffractive optical element, the third beam and the fourth beam being configured to interfere with one another to generate a second interference pattern at the second side of the diffractive optical element;
- a detector disposed at the second side of the diffractive optical element, and configured to detect the second interference pattern;
- a plurality of optical elements configured to guide the first beam and the second beam to the diffractive optical element;
- a reconfigurable reflector disposed in an optical path of the first beam and configured to control a wavefront of the first beam while reflecting the first beam;
- and
- a controller coupled with the detector and the reconfigurable reflector,
- wherein the detector is configured to generate a signal based on the detected second interference pattern, and
- wherein the controller is configured to control the reconfigurable reflector based on the signal received from the detector to stabilize the first interference pattern.
8 more elements
A method, comprising:
- guiding a first beam and a second beam to a diffractive optical element from a first side of the diffractive optical element, the first beam and the second beam being configured to interfere with one another to generate a first interference pattern at the first side of the diffractive optical element;
- forwardly diffracting, by the diffractive optical element, the first beam and the second beam to output a third beam and a fourth beam at a second side of the diffractive optical element, the third beam and the fourth beam being configured to interfere with one another to generate a second interference pattern at the second side of the diffractive optical element;
- detecting, by a detector disposed at the second side of the diffractive optical element, the second interference pattern, and generating, by the detector, a signal relating to the detected second interference pattern;
- and
- stabilizing the first interference pattern based on the signal relating to the detected second interference pattern received from the detector,
- wherein guiding the first beam and the second beam to the diffractive optical element further comprises:
- guiding, by a plurality of optical elements, the first beam and the second beam to the diffractive optical element,
- wherein stabilizing the first interference pattern based on the signal relating to the detected second interference pattern received from the detector further comprises:
- controlling, by a controller, a reconfigurable reflector disposed in an optical path of the first beam based on the signal relating to the detected second interference pattern received from the detector;
- and
- adjusting, by the reconfigurable reflector, a wavefront of the first beam while reflecting the first beam.
8 more elements
Dependencies are inferred from the claim text.