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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Stimulated Raman spectroscopy using low-power cw lasers
Optics Letters
|August 15, 2009
Abstract:
It is demonstrated that stimulated Raman spectroscopy (SRS) can be performed using cw dye lasers at power levels over six orders of magnitude smaller than those generally associated with pulsed stimulated Raman studies. The preliminary results suggest that cw SRS is a potentially powerful alternative to conventional spontaneous Raman scattering, with resolution limited solely by laser linewidth and sensitivity independent of resolution requirements.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...