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Coherently amplified Raman polarization gate for imaging through scattering media
Optics Letters
|October 16, 2009
Abstract:
We demonstrate a new nonlinear optical field cross-correlation technique for two-dimensional imaging through scattering media. The technique, the coherently amplified Raman polarization gate, relies on both the polarization and coherence sensitivity of broadband stimulated Raman amplification to produce a high-contrast gate with temporal resolution of the order of the inverse bandwidth of the pump.
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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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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...