Patent ID: 11892399
Assignee: NIKIRA LABS INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. A method of performing an absorption measurement of a medium sample, the method comprising:
coupling a laser beam having a wavelength corresponding to an absorption region of interest into a ringdown cavity comprising a chamber, an input mirror at an input end of the chamber, an output mirror at an output end of the chamber, and an optical axis that extends through a center of the input mirror and a center of the output mirror, wherein a cavity geometry of the ringdown cavity increases a re-entrant condition of the ringdown cavity relative to a conventional cavity comprised of two spherical mirrors;
injecting a medium sample into the chamber; and
detecting an intensity of light of the wavelength corresponding to the absorption region of interest that extends through the output mirror,
wherein the cavity geometry is defined in part by a cavity length that results in a highest transverse mode density for the respective designs of each of the input mirror and the output mirror.