US 11,885,681 B2
Methods and devices for standoff differential Raman spectroscopy with increased eye safety and decreased risk of explosion
Daryoosh Vakhshoori, Cambridge, MA (US); Romain Blanchard, Lexington, MA (US); Peili Chen, Andover, MA (US); Masud Azimi, Belmont, MA (US); Tobias Mansuripur, Cambridge, MA (US); Kalyani Krishnamurthy, Lincoln, MA (US); Arran M. Bibby, Savannah, GA (US); Fred R. Huettig, III, Sudbury, MA (US); Gokhan Ulu, Newton, MA (US); and Greg Vander Rhodes, Lexington, MA (US)
Assigned to Pendar Technologies, LLC, Cambridge, MA (US)
Filed by Pendar Technologies, LLC, Cambridge, MA (US)
Filed on Mar. 28, 2022, as Appl. No. 17/705,846.
Application 17/705,846 is a division of application No. 17/130,295, filed on Dec. 22, 2020, granted, now 11,300,448.
Application 17/130,295 is a division of application No. 16/351,174, filed on Mar. 12, 2019, granted, now 10,921,187, issued on Feb. 16, 2021.
Application 16/351,174 is a continuation of application No. PCT/US2019/021312, filed on Mar. 8, 2019.
Claims priority of provisional application 62/793,601, filed on Jan. 17, 2019.
Claims priority of provisional application 62/692,657, filed on Jun. 29, 2018.
Claims priority of provisional application 62/678,065, filed on May 30, 2018.
Prior Publication US 2022/0333985 A1, Oct. 20, 2022
Int. Cl. G01J 3/02 (2006.01); G01J 3/44 (2006.01); G01J 3/28 (2006.01); G01J 3/06 (2006.01); H01S 3/00 (2006.01); G01K 11/3213 (2021.01); H01S 3/094 (2006.01); H01S 3/108 (2006.01); H01S 3/30 (2006.01); G01K 11/324 (2021.01)
CPC G01J 3/0275 (2013.01) [G01J 3/0202 (2013.01); G01J 3/0208 (2013.01); G01J 3/0216 (2013.01); G01J 3/0224 (2013.01); G01J 3/0237 (2013.01); G01J 3/0248 (2013.01); G01J 3/0256 (2013.01); G01J 3/0264 (2013.01); G01J 3/0272 (2013.01); G01J 3/0286 (2013.01); G01J 3/06 (2013.01); G01J 3/2823 (2013.01); G01J 3/44 (2013.01); G01J 3/4406 (2013.01); G01J 3/4412 (2013.01); G01K 11/3213 (2013.01); H01S 3/0014 (2013.01); H01S 3/094046 (2013.01); H01S 3/1086 (2013.01); H01S 3/302 (2013.01); G01J 2003/4424 (2013.01); G01K 11/324 (2021.01); H01S 3/0071 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of Raman spectroscopy of a sample, the method comprising:
illuminating the sample, via a telescope, with a first ranging beam propagating along an optical axis of the telescope to form a first spot on the sample;
illuminating the sample, via the telescope, with a second ranging beam propagating along a marginal ray of the telescope to form a second spot on the sample;
detecting a distance between the first spot and the second spot;
adjusting a focus of the telescope based on the distance between the first spot and the second spot;
illuminating the sample, via the telescope, with a Raman pump beam propagating along the optical axis of the telescope; and
measuring a Raman signal scattered by the sample in response to the Raman pump beam.