| CPC G01N 21/65 (2013.01) [G01N 2201/0612 (2013.01)] | 30 Claims |
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1. A system comprising:
a first light source configured to produce a first beam of light at a first frequency;
a second light source configured to produce a second beam of light at a second frequency, wherein the first and second frequencies are offset by a frequency offset Ω;
one or more optical elements configured to:
direct the first and second beams of light to a sample; and
collect a Raman signal produced by the sample in response to the first and second beams of light;
an optical receiver configured to detect the Raman signal, the optical receiver comprising:
a third light source configured to produce a third beam of light at a third frequency, wherein the third light source comprises a wavelength-tunable laser, wherein the third frequency is adjustable by changing a wavelength of light produced by the wavelength-tunable laser; and
an optical detector configured to coherently mix a portion of the Raman signal with at least a portion of the third beam of light to produce an electronic signal; and
a processor configured to determine a characteristic of the electronic signal.
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