Patent ID: 8982352
Filing Date: 2015-03-17
Classification: G01J,G01N,H01S

Abstract:
1. A method for performing cavity enhanced optical spectroscopy, the method comprising: providing an optical resonator that defines a first set of cavity modes having a free spectral range (FSR) and which is configured to include a sample for analysis, wherein the optical resonator is configured to passively provide relative frequency stability of the first set of cavity modes of 10% or less of the FSR in a time period of about 1 second; providing an optical source configured to deliver optical radiation to the optical resonator; providing a detector configured to receive an absorbance signal from the optical resonator that is responsive to optical absorption in the sample; collecting spectrograms from the sample by sweeping a frequency of the optical source through two or more frequencies of the first set of cavity modes and recording the absorbance signal; and computing an analysis output from the spectrogram by assuming that data points in the spectrogram are evenly spaced in frequency, without reference to absolute frequencies of the data points.