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US 12,613,135 B2Granted
Optical device, system and method for dispersion interferometry
AssigneeDeutsches Zentrum für Luft- und Raumfahrt e.V.
InventorsOliver Kliebisch, Peter Mahnke, Raoul-Amadeus Lorbeer
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Abstract
An optical device, a system and a method for dispersion interferometry includes a frequency doubling device and an optical modulation device, a transmission beam path which is configured to emit a first and second measurement beam on an optical element and a reception beam path which is configured to receive a first and second measuring beam returned by the optical element.
Claims20
An optical device, comprising
- a laser beam source for emitting a first laser beam having a fundamental frequency of the laser beam source;
- a frequency doubling device and an optical modulation device for generating a second laser beam at a frequency of a second harmonic of the fundamental frequency, and a first diffracted laser beam having an intensity of the first diffraction order of a modulated fundamental frequency, and a second diffracted laser beam having an intensity of the second diffraction order of the second harmonic;
- a reference beam path which is designed to image a first and second reference beam onto a receiving unit;
- a transmission beam path which is designed to emit a first and second measurement beam onto an optical element;
- a reception beam path which is designed to receive a first and second measuring beam returned by the optical element;
- a superposition unit which is used for superimposing the first and second reference beams on the returned first and second measurement beams and for imaging the superimposed returned first and second measurement beams and first and second reference beams onto the receiving unit, wherein the receiving unit is configured for receiving the superimposed returned first and second measuring beams and first and second reference beams and for converting them into an electrical reception signal;
- and an evaluation unit which is configured to at least evaluate the electrical reception signal,
- wherein the first and second measurement beams are configured as first and second laser beams and the first and second reference beams are configured as first and second diffracted laser beams,
- or
- wherein the first and second measurement beams are configured as first and second diffracted laser beams and the first and second reference beams are configured as first and second laser beams.
7 more elements
A method for dispersion interferometry with an optical device, comprising:
- emitting a first laser beam by means of a laser beam source having a fundamental frequency of the laser beam source;
- generating a second laser beam at a frequency of a second harmonic of the fundamental frequency, and a first diffracted laser beam having an intensity of the first diffraction order of a modulated fundamental frequency, and a second diffracted laser beam having an intensity of the second diffraction order of the second harmonic frequency by means of a frequency doubling device and an optical modulation device;
- imaging a first and second reference beam in a reference beam path onto a receiving unit;
- emitting a first and second measurement beam in a transmission beam path onto an optical element;
- receiving a first and second measuring beam returned by the optical element in a reception beam path;
- superimposing the returned first and second measurement beams on the first and second reference beams by a superposition unit and imaging onto the receiving unit;
- receiving the superimposed returned first and second measurement beams and the first and second reference beams by the receiving unit and converting into an electrical reception signal;
- evaluating the received electrical signal by an evaluation unit,
- wherein the first and second measurement beams are configured as first and second laser beams and the first and second reference beams are configured as first and second diffracted laser beams,
- or
- wherein the first and second measurement beams are configured as first and second diffracted laser beams and the first and second reference beams are configured as first and second laser beams.
8 more elements
Dependencies are inferred from the claim text.