Results 251 to 260 of about 7,929 (304)

Amplified spontaneous Raman scattering and gain in fiber Raman amplifiers

Journal of Lightwave Technology, 1985
The spectrum of amplified spontaneous Raman scattering and gain in a fiber Raman amplifer has been calculated analytically as a function of distance and pump power. The model used makes no assumptions on the magnitude of the gain and considers the pump nondepletion region.
P Melman
exaly   +2 more sources

Spontaneous Raman Scattering for Gas Phase Diagnostics

MRS Proceedings, 1988
AbstractThe use of spontaneous rotational and vibrational Raman scattering for nonperturbing measurements of temperature and gas phase concentrations in combustion and in materials processing is reviewed. Theory of Raman intensities is briefly discussed and examples of Raman scattering from metal halide vapors in high temperature furnaces, laminar ...
Michael C. Drake
openaire   +2 more sources

Random number generation from spontaneous Raman scattering [PDF]

Applied Physics Letters, 2015
We investigate the generation of random numbers via the quantum process of spontaneous Raman scattering. Spontaneous Raman photons are produced by illuminating a highly nonlinear chalcogenide glass (As2S3) fiber with a CW laser at a power well below the ...
Matthew J Collins, Alex S Clark, M J Steel   +2 more
exaly   +2 more sources

Spontaneous Raman and Surface-Enhanced Raman Scattering Bioimaging

2021
Raman spectroscopy is a specific, noninvasive and nondestructive optical technique and is able to obtain chemical information from molecules. Optical imaging based on Raman spectroscopy has been a powerful technique for monitoring minute chemical changes of biological samples and generating images through direct or indirect strategies.
Li, Lin, Jian, Ye
openaire   +2 more sources

The buildup of stimulated Raman scattering from spontaneous Raman scattering

Optics Communications, 1981
Abstract We present a quantum electrodynamic theory which shows for the first time how stimulated Raman scattering builds up, both spatially and temporally, from spontaneous Raman scattering. We analytically solve operator Maxwell-Bloch equations to find the Stokes field operator, and thus the Stokes intensity, for both monochromatic and broad-band ...
J. Mostowski, M.G. Raymer
openaire   +1 more source

Spontaneous Raman scattering in ultrasmall silicon waveguides

Optics Letters, 2004
We report spontaneous Raman scattering at 1550 nm in ultrasmall silicon-on-insulator (SOI) strip waveguides of 0.098-microm2 cross-sectional area. The submicrometer-scale dimensions provide tight optical confinement and, hence, highly efficient Raman scattering with milliwatt-level cw pump powers.
Jerry I, Dadap, Richard L, Espinola, Richard M, Osgood, Sharee J, McNab, Yurii A, Vlasov   +4 more
openaire   +2 more sources

Stimulated Raman scattering and spontaneous Raman solitons in ammonia

Infrared Physics & Technology, 1998
Abstract In this study we report the first observation of spontaneous Raman solitons in stimulated Raman scattering (SRS) by the gas NH 3 . The scattered radiation is called Stokes radiation. Raman solitons are of considerable interest, because their existence can be explained by quantum-mechanical fluctuations of the electromagnetic field in vacuum.
M.O. Baumgartner, D.P. Scherrer, F.K. Kneubühl   +2 more
openaire   +1 more source

Unified theory of spontaneous and stimulated rotational Raman scattering

Physical Review A, 1990
A general analytic theory of spontaneous and stimulated rotational Raman scattering is presented. This analytic description incorporates arbitrary polarization, time dependence, phase matching, and parametric coupling of the pump, Stokes, and anti-Stokes fields and the degeneracy of the rotational states. The analytic expressions for the time-dependent
, Hermann, , Chambers, , Dixit, , Karr
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Spontaneous Raman Scattering with Picosecond Pulses

1996
The first informations about vibrational relaxation processes in liquids were obtained by observing the time evolution of the spontaneous anti-Stokes Raman scattering from vibrational states with a non equilibrium population1. Due to the small raman scattering cross sections and the envolved relaxation time constants these experiment are rather ...
H. Graener, M. Hofmann
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Spontaneous-Raman-Scattering Efficiency and Stimulated Scattering in Silicon

Physical Review B, 1970
The absolute spontaneous-Raman-scattering efficiency and linewidth of the 521-${\mathrm{cm}}^{\ensuremath{-}1}$ optical mode of silicon have been measured at 77 K using a continuous laser (Nd in yttrium aluminum garnet) operating at 1.064 \ensuremath{\mu}m.
J. M. Ralston, R. K. Chang
openaire   +1 more source