What causes Raman scattering?

Due to vibrations in the chemical bonds this interaction causes a specific energy shift in parts of the back scattered light which results in a unique Raman spectrum. Raman scattering: Raman scattering is a very weak effect, typically less than one in a million excitation photons give rise to a single Raman photon.

Which phenomenon is responsible for Raman scattering?

The Raman effect involves scattering of light by molecules of gases, liquids, or solids. The Raman effect consists of the appearance of extra spectral lines near the wavelength of the incident light. The Raman lines in the scattered light are weaker than the light at the original wavelength.

What is SRS in optical communication?

The effect of stimulated Raman scattering (SRS) in fiber optic communications is considered. On one hand, SRS limits the launch power in a multiple-channel communication system; while on the other hand, SRS can provide optical amplification in the 1.3-μm and 1.55-μm windows.

What is Raman scattering of light?

Raman scattering is an optical process where incoming excitation light interacting with a sample produces scattered light that is lessened in energy by the vibrational modes of the chemical bonds of the specimen.

How are Raman scattering and laser amplification related?

In optical fiber devices such as fiber amplifiers for intense pulses, Raman scattering can be detrimental: it can transfer much of the pulse energy into a wavelength range where laser amplification does not occur.

How does Raman scattering affect the conversion process?

Multiple modes are involved in the conversion process. In optical fiber devices such as fiber amplifiers for intense pulses, Raman scattering can be detrimental: it can transfer much of the pulse energy into a wavelength range where laser amplification does not occur. This effect can limit the peak power achievable with such devices.

How is stimulated Raman scattering used in silica fiber?

Stimulated Raman scattering, an optical-phonon based nonlinear effect present in silica fiber, is used to convert energy from a pump located at a frequency ν p, to a signal located at a lower frequency ν s. The efficiency of the so-called Raman amplification depends on the frequency shift Δν r = ν p − ν s.

When does unwanted Raman scattering occur in bulk media?

In bulk media, such as certain nonlinear crystal materials, unwanted stimulated Raman scattering can occur even via non-collinear phase matching, if the pump intensity is rather high and the beam width is large enough. This can occur e.g. in optical parametric generators operated with intense pump pulses.