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

Claim 0:
1. An optical system for performing an absorption measurement of a medium sample, the optical system comprising:
a laser source configured to output a laser beam having a wavelength corresponding to an absorption region of interest;
a ringdown cavity comprising a chamber configured to receive the medium sample, 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, the ringdown cavity having a cavity geometry defined by:
a first design of the input mirror and a second design of the output mirror, wherein the first design and the second design produce a total spot overlap area on the output mirror that is less than the total spot overlap area of a cavity geometry defined by a spherical input mirror and a spherical output mirror, and
a cavity length;

a coupling device configured to couple the laser beam through the input mirror into the chamber as one of a single narrow-diameter laser beam or a large-diameter laser beam; and
a detector optically coupled with the ringdown cavity, and configured to detect an intensity of light of the wavelength corresponding to the absorption region of interest that extends through the output mirror,
wherein the 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.