A quantitative demonstration of the enhancement of cavity enhanced Raman scattering by broad band external laser seeding

Symes, Rachel; Meresman, Helena; Sayer, Robert M.; Reid, Jonathan P.

doi:10.1016/j.cplett.2005.12.038

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…Various methods such as external and internal seeding using lasing dye and liquid Raman medium for reducing the SRS threshold and enhancing the weaker gain of SRS were reported [15,16,[23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Enhancement of stimulated Raman scattering in terrace-microspheres

et al. 2011

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Terrace-microspheres of high-index glass (BaO-SiO 2-TiO 2 glass, n D ¼ 1:93) containing 0:3 ppm of Nd 3þ were used to investigate the interaction between Raman scattering due to a glass matrix and fluorescence due to Nd 3þ. The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser (790 nm-830 nm wavelength) for changing pumping wavelengths. With pumping in the 800-830 nm wavelength region, there was a spectral overlap between Raman scattering and Nd 3þ fluorescence. Under such conditions, Nd 3þ fluorescence works as a seeding and an amplifier of stimulated Raman scattering (SRS), resulting in SRS enhancement. With pumping of 20 mW power at around 830 nm wavelength, the terrace-microspheres showed the strongest SRS gain, 5-6 times of that of 790 nm wavelength pumping. SRS thresholds of the terrace-microspheres were improved from 3 mW (790 nm wavelength pumping) to 0:3 mW (830 nm pumping) due to the enhancement effect. The potential application for a multiwavelength Raman laser with a low threshold was demonstrated in the near-IR region (λ ¼ 840-940 nm).

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Section: Resultsmentioning

confidence: 99%

Enhancement of stimulated Raman scattering in terrace-microspheres

et al. 2011

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“…34 However, when there are two Raman active species within the droplet with overlapping Raman bands, spontaneous emission from species A can seed species B and allow the threshold energy required for SRS to be reached at lower concentrations of species B than would be otherwise observed. 35 Hence, a low concentration of species B may have a higher maximum band intensity than the corresponding band intensity of species B in a binary solution with water. This could lead to artificiallyhigh concentrations of alcohol being determined in ternary solutions if the binary calibration curves were used.…”

Section: Resultsmentioning

confidence: 99%

Probing the evaporation of ternary ethanol–methanol–water droplets by cavity enhanced Raman scattering

Howle

Homer

Hopkins

et al. 2007

Phys. Chem. Chem. Phys.

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Cavity enhanced Raman scattering is used to characterise the evolving composition of ternary aerosol droplets containing methanol, ethanol and water during evaporation into a dry nitrogen atmosphere. Measurements made using non-linear stimulated Raman scattering from these ternary alcohol-water droplets allow the in situ determination of the concentration of the two alcohol components with high accuracy. The overlapping spontaneous Raman bands of the two alcohol components, arising from C-H stretching vibrational modes, are spectrally-resolved in stimulated Raman scattering measurements. We also demonstrate that the evaporation measurements are consistent with a quasi-steady state evaporation model, which can be used to interpret the evaporation dynamics occurring at a range of pressures at a particular evaporation time.

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“…The phase function was dependent on the refractive index, the incident wavelength, and the particle size. Accordingly, the phase function could be utilized to calculate the particle diameter (Chang and Biswas, 1992;Gatherer et al, 2002;Hopkins et al, 2003;Mitchem et al, 2006;Symes et al, 2006;Davies et al, 2012;Haddrell et al, 2013). In addition, the chemical composition or mixing state of particle could influence the refractive index, size, and density, which in sequence directly affect their optical properties (Liu and Mishchenko, 2007;Gangl et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Measurement and Evaluation of Elastic Light Scattering from a Single Levitated Irregular Particle

Kao

Huang

Chen

et al. 2017

Aerosol Air Qual. Res.

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This study introduced a convenient experimental method to measure and to evaluate the elastic light scattering from a single irregular particle. The particle levitation system was used to trap a particle and to maintain the particle at null position by utilizing electrodynamic balance. Moreover, the Raman spectroscopy was applied to observe the light scattering of a single particle. The influences of relative humidity on optical properties of particle were also discussed. For comparison with experimental results, the classical Lorenz-Mie theory was employed to compute the phase function of a single particle. The experimental results demonstrated that the measurements of light scattering were in approximate trend with the model. In particular, numerical simulation results showed that the scattering intensity was underestimated in backward scattering directions. Consequently, the effect of surface roughness and irregular morphology of particle might be resulted in deviations of backward scattering. Besides, the experiments suggested that while using the weighted average method to estimate the refractive index might cause some significant deviations of light scattering between measuring and modeling.

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A quantitative demonstration of the enhancement of cavity enhanced Raman scattering by broad band external laser seeding

Cited by 4 publications

References 15 publications

Enhancement of stimulated Raman scattering in terrace-microspheres

Enhancement of stimulated Raman scattering in terrace-microspheres

Probing the evaporation of ternary ethanol–methanol–water droplets by cavity enhanced Raman scattering

Measurement and Evaluation of Elastic Light Scattering from a Single Levitated Irregular Particle

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