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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Frequency pulling of stimulated Raman scattering in microdroplets
Optics Letters
|September 22, 2009
Abstract:
Spectral features observed in stimulated Raman scattering from 20-microm methanol droplets at 1-GW/cm(2) pumping levels appeared locked in wavelength at the center of their respective gain profiles. Typically, a feature's wavelength remained constant while the droplet size varied by as much as 0.3%. This is attributed to frequency-pulling effects caused by the presence of Raman gain. Wavelength shifts of up to +/-0.5 nm in the positions of morphologydependent resonances would explain the observations and are consistent with calculations.
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01:20Raman Spectroscopy: Overview
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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
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...