US 11,867,623 B2 · Use of gradient-index lenses for cavity enhanced absorption spectroscopy

Abstract

A cavity enhanced absorption spectroscopy (CEAS) system is provided that utilizes collimators the incorporate gradient index (GRIN) lenses in lieu of conventional spherical or aspheric refractive lenses. The use of smaller diameter GRIN lenses facilitates a reduced initial beam size entering the sample cavity, which reduces self-interference noise and increases a signal to noise ratio of the measurements. Further, a reduced size and mass of the GRIN lens can reduce a size of the mounting hardware utilized to mount the optical components, which enables more laser beams to be coupled to a single gas cell compared to a similar gas cell integrated with conventional refractive collimators. A larger number of lasers enables more gas peaks to be measured substantially simultaneously using the CEAS system.

Claims15

Dependent claims

A cavity enhanced absorption spectroscopy (CEAS) system, comprising:

a gas cell enclosed by a first mirror on one end of the gas cell and a second mirror on the other end of the gas cell to form a cavity therein;
and
a plurality of optical component sub-units, each respective optical component sub-unit including at least a collimator and mounting hardware, wherein the collimator operates to direct a respective laser beam into the cavity having an initial beam size less than 3 millimeters in diameter, wherein each optical component sub-unit is associated with a laser beam of a different wavelength, and wherein the plurality of optical component sub-units are disposed in locations offset from each other in a direction away from a central axis of the gas cell, so that the plurality of laser beams directed by the plurality of optical component sub-units into the cavity are offset from each other in the direction away from the central axis of the gas cell.

Dependencies are inferred from the claim text.

Use of gradient-index lenses for cavity enhanced absorption spectroscopy

Life of this patent

Use of gradient-index lenses for cavity enhanced absorption spectroscopy

Life of this patent

Abstract

Claims15