Stimulated Raman Scattering

White, J. C.

doi:10.1007/978-3-662-10635-8_4

Cited by 30 publications

(14 citation statements)

References 234 publications

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“…Until 1990, no successful attempt had been made to reduce the bandwidth of Raman shifted light to its physical limits [ 1,2 ]. For a pump laser with negligible linewidth, the bandwidth of the Raman shifted light is determined by pressure broadening in the high density regime of the gaseous Raman medium (H2: p > 5 amagat) and by Doppler broadening in the low density re#me (H2: p< 2 amagat).…”

Section: Introductionmentioning

confidence: 99%

Frequency shifting of pulsed narrow-band laser light in a multipass Raman cell

Suβmann

Weber

Riedle

et al. 1992

Optics Communications

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A multipass cell is described which allows efficient stimulated Raman frequency shifting for low pump laser intensities and low gas pressures. The latter is important for Raman shifting of narrow-band Fourier-transform limited light pulses (A v = 75 MHz). It is shown that frequency broadening of the Raman shifted light can be largely avoided in the Dicke narrowing regime at low pressures. For 75 MHz pump pulses and an H2 density of 2.5 amagat we found a negligible broadening to 90 MHz of the stimulated Stokes light. This is far below the value of 250 MHz expected from spontaneous emission. The narrow-band Stokes pulses achieved in CO2 enabled us to measure the pressure shift coefficient ( -0.71 × 10-2 cm-1/amagat) of this gas. It is demonstrated, for the example of benzene, that our technique provides a very practical light source for high resolution molecular spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Frequency shifting of pulsed narrow-band laser light in a multipass Raman cell

Suβmann

Weber

Riedle

et al. 1992

Optics Communications

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“…where g(ℏδ w ) is the joint state density of Raman transition. Therefore, the FWHM of spontaneous Raman spectra is inversely proportional to Raman gain coefficient . So Si QDs can increase the Raman gain coefficient of water molecules.…”

Section: Resultsmentioning

confidence: 99%

Si quantum dots enhancement stimulated Raman scattering of water molecules

Wang

et al. 2018

J Raman Spectroscopy

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Stimulated Raman scattering (SRS) spectra of the OH stretching vibrations of pure water and 2‐nm Si quantum dots (Si QDs) water solution have been investigated under different pump laser energies. Simultaneously, we have studied the spontaneous Raman spectra of pure water and Si QDs water solution at room temperature and atmospheric pressure. The results show that SRS intensity of Si QDs water solution is an order of magnitude higher than that of pure water at the same laser energy, which indicates that Si QDs enhance the SRS intensity of water molecules. The QDs enhancement SRS mechanism is attributed to the increase of third‐order nonlinear Raman susceptibility from the electric fields induced by the exciton effect of Si QDs.

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“…Therefore, although absorption spectroscopy is general technique for gas measurement, it is difficult to adapt it for hydrogen gas measurement. On the other hand, the hydrogen molecule shows strong Raman effect [4] . The Raman scattering is the inelastic scattering, which is caused by the interaction between the incident photon and target gas molecules.…”

Section: Principlementioning

confidence: 99%

Hydrogen gas concentration measurement in small area using raman lidar measurement technnology

2018

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When change of hydrogen(H2) gas concentration in a certain point is measured, non-contact measurement technology with high temporal and spatial resolution is necessary. In this study, H2 concentration in the small area of <1cm2 under the gas flow was measured by using a Raman lidar. Raman scattering light at the measurement point of 750mm ahead was detected by the Raman lidar. As a result, it was proved that the H2 concentration of more than 100ppm could be successfully measured.

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Stimulated Raman Scattering

Cited by 30 publications

References 234 publications

Frequency shifting of pulsed narrow-band laser light in a multipass Raman cell

Frequency shifting of pulsed narrow-band laser light in a multipass Raman cell

Si quantum dots enhancement stimulated Raman scattering of water molecules

Hydrogen gas concentration measurement in small area using raman lidar measurement technnology

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