Multiple wavelength cavity ring-down spectroscopy
AssigneeQueen's University at Kingston
InventorsHans-Peter Loock, Helen Waechter
Life of this patent
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Abstract
Described are methods for multi-wavelength cavity ring-down spectroscopy; comprising simultaneously and continuously irradiating an optical cavity with light at two or more different wavelengths, each light being intensity-modulated at a different modulation frequency, detecting the light of two or more wavelengths after the light has traveled through the optical cavity; measuring an optical loss of each detected light; and determining a characteristic of the optical cavity from the optical loss of each detected light. Also described are apparatus and systems for multi-wavelength cavity ring-down spectroscopy.
Claims19
A method for multi-wavelength cavity ring-down spectroscopy;
- comprising:
- simultaneously and continuously irradiating an optical cavity with light at two or more different wavelengths, each light being intensity-modulated at a different modulation frequency;
- detecting the light of two or more wavelengths after the light has traveled through the optical cavity;
- measuring an optical loss of each detected light;
- and
- determining a characteristic of the optical cavity from the optical loss of each detected light;
- wherein measuring optical loss comprises measuring phase shift between light entering and exiting the optical cavity for each of the two or more wavelengths at their respective modulation frequencies.
Apparatus for multi-wavelength cavity ring-down spectroscopy;
- comprising:
- an optical cavity;
- two or more light sources of different wavelengths, each light being intensity-modulated at a different modulation frequency;
- a detector that detects the light of two or more wavelengths after the light has traveled through the optical cavity;
- and
- a processor that measures an optical loss of each detected light;
- wherein measuring optical loss comprises measuring phase shift between light entering and exiting the optical cavity for each of the two or more wavelengths at their respective modulation frequencies.
Dependencies are inferred from the claim text.