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Abstract

A system for high gain stimulated Raman spectroscopy comprises a first continuous wave laser having an output beam at a tunable optical frequency modulated at a first RF frequency, a second continuous wave laser having a second output beam at an optical frequency modulated at a second RF frequency, wherein the modulation frequencies are selected such that their beat notes represent a Raman resonance frequency, a dual-beam rasterizing probe including first and second photosensors and a rasterizer configured to scan the first and second laser output beams onto a sample, exposing the sample to a reduced average power of laser radiation stimulating the sample to emit Raman radiation signals. The Raman signals are directed to the photosensors and the outputs of the photosensors are supplied to a differential amplifier configured to provide sensitivity and gain to signals at the beat note resonant frequency and to filter signals at other frequencies.

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First Claim