US 12,276,548 B2
Apparatus and method for dual comb spectroscopy
Ian Robert Coddington, Boulder, CO (US); Nathan Reynolds Newbury, Boulder, CO (US); Jean-Daniel Deschenes, Quebec (CA); Fabrizio Raphael Giorgetta, Boulder, CO (US); and Esther Baumann, Boulder, CO (US)
Assigned to GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE, Gaithersburg, MD (US)
Filed by Government of the United States of America, as represented by the Secretary of Commerce, Gaithersburg, MD (US)
Filed on May 1, 2023, as Appl. No. 18/141,647.
Claims priority of provisional application 63/336,542, filed on Apr. 29, 2022.
Prior Publication US 2023/0349761 A1, Nov. 2, 2023
Int. Cl. G01J 3/433 (2006.01); G01J 3/02 (2006.01); G01J 3/28 (2006.01); G01J 3/45 (2006.01)
CPC G01J 3/433 (2013.01) [G01J 3/0248 (2013.01); G01J 3/45 (2013.01); G01J 2003/2836 (2013.01); G01J 2003/4332 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method of dual comb spectroscopy for detecting a sample, comprising:
generating a first programmable frequency comb with a first optical pulse train, wherein the first optical pulse train is phase stabilized by applying a first phase-lock to the first programmable frequency comb at a first frequency of the first programmable frequency comb electro-magnetic spectrum and a second phase-lock to the first programmable frequency comb at a second frequency of the first programmable frequency comb electro-magnetic spectrum to a reference oscillator;
generating a second programmable frequency comb with a second optical pulse train, wherein the second optical pulse train is phase stabilized by applying a third phase-lock to the second programmable frequency comb at a third frequency of the second programmable frequency comb electro-magnetic spectrum and a fourth phase-lock to the second programmable frequency comb at a fourth frequency of the second programmable frequency comb electro-magnetic spectrum to the reference oscillator;
generating a sampling pattern comprising a sequence of a plurality of relative delays between the first optical pulse train and the second optical pulse train;
determining a first phase offset from the sampling pattern for applying to the first phase-lock of the first programmable frequency comb and a second phase offset from the sampling pattern for applying to the second phase-lock of the first programmable frequency comb;
applying at least one of the first and the second phase offsets to the first programmable frequency comb to set the sequence of the plurality of the relative delays between the first optical pulse train and the second optical pulse train;
directing at least one of the first and the second pulse trains through the sample to probe the sample;
detecting an optical output from the probed sample;
digitizing the detected optical output from the probed sample;
demodulating the digitized optical output to generate an optical field product of the first optical pulse train and the second optical pulse train, wherein the optical field product of the first and the second optical pulse trains is generated at the sequence of the plurality of the relative delays between the first optical pulse train and the second optical pulse train; and
reconstructing the demodulated digitized optical output to generate a representation of the sample response.