Optical Measurement Apparatus and Method
First Claim
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1. An optical modulation spectroscopy system comprising:
- a probe beam source;
a probe beam directed at a sample to give rise to a reflected probe beam;
a pump beam source;
a modulator for modulating a pump beam;
a modulated pump beam directed at a sample;
a dispersive system for dispersing the reflected probe beam into constituent wavelengths to provide dispersed beams; and
a detection system for detecting a plurality of the dispersed reflected probe beams, and for processing a signal corresponding to each, the detection system comprising;
an array of detectors and a circuit, with a detector for detecting each of at least some of said dispersed beams; and
wherein each detector produces as output an electrical signal which comprises both a DC signal, proportional to the reflectance of a dispersed beam and an AC modulated signal at the modulation frequency proportional to the modulation of the reflectance of a dispersed beam.
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Abstract
An optical modulation spectroscopy system comprises a probe beam source and components for directing the probe beam at a sample. It also may comprise a modulated pump beam source and components for directing a modulated pump beam at the sample. A dispersive system may disperse the reflected probe beam into constituent wavelengths to provide dispersed beams. A detector array may detect multiple dispersed reflected probe beams and processes a signal corresponding to each. Thus, measurement may be multiplexed for very fast performance.
17 Citations
28 Claims
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1. An optical modulation spectroscopy system comprising:
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a probe beam source; a probe beam directed at a sample to give rise to a reflected probe beam; a pump beam source; a modulator for modulating a pump beam; a modulated pump beam directed at a sample; a dispersive system for dispersing the reflected probe beam into constituent wavelengths to provide dispersed beams; and a detection system for detecting a plurality of the dispersed reflected probe beams, and for processing a signal corresponding to each, the detection system comprising; an array of detectors and a circuit, with a detector for detecting each of at least some of said dispersed beams; and wherein each detector produces as output an electrical signal which comprises both a DC signal, proportional to the reflectance of a dispersed beam and an AC modulated signal at the modulation frequency proportional to the modulation of the reflectance of a dispersed beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A modulation spectroscopy method carried out by a modulation spectroscopy system, the method comprising:
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directing a probe beam at a sample to give rise to a reflected probe beam; modulating a pump beam, and directing the modulated pump beam at the sample; dispersing the reflected probe beam with a dispersive system into constituent wavelengths to provide dispersed beams; detecting a plurality of the dispersed reflected probe beams with a detection system and processing a signal corresponding to each, with the detection system comprising; an array of detectors and a circuit, with a detector detecting each of at least one of said dispersed beams; and each detector produces as output an electrical signal which comprises both a DC signal, proportional to the reflectance of a dispersed beam and an AC modulated signal at the modulation frequency proportional to the modulation of the reflectance of a dispersed beam. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification