Results 231 to 240 of about 1,310,543 (278)

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
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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 ...
Alexander Clark, Michael Steel, Matthew Collins   +2 more
exaly   +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
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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
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Pulsed spontaneous Raman scattering technique for luminous environments

Applied Optics, 1978
A gated photon counting system, cavity-dumped argon-ion laser, and a multipass retroreflecting light cell have been combined in a system to enhance spontaneous Raman scattering in luminous background situations. Signal-to-background ratio (SBR) has been improved a factor of 450 over a single-pass cw system with cw power equal to the pulsed average ...
A J, Mulac, W L, Flower, R A, Hill, D P, Aeschliman   +3 more
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Temperature measurements in spray flames by spontaneous Raman scattering

Optics Letters, 1996
Spontaneous Raman scattering was applied for quantitative temperature measurements in turbulent methanol spray flames. Possible interferences from laser-induced breakdown and elastic light scattered from the fuel drops were discriminated against by optoacoustic means. Polycyclic aromatic hydrocarbons were found to be a negligible source of fluorescence
A N, Karpetis, A, Gomez
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Dynamics of polynucleotide/solvent interaction with spontaneous Raman scattering

SPIE Proceedings, 1994
Isotropic and Anisotropic Raman spectra of RNA and DNA solutions have been obtained with a scanning monochromator system. The registration of the spectra was optimized for the special purpose of extracting bandwidth information and the non-coincidence effect. The following polynucleotides were selected: poly(rA) poly(rU) , poly(rA) . poly(rU) , poly(rk-
Otto, Cornelis, Terpstra, P.A., Greve, Jan   +2 more
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Spontaneous Raman scattering by ground-state oxygen atoms

Optics Letters, 1981
We report the first known observation of Raman scattering by oxygen atoms. The (3)P(2)?(3)P(1) and (3)P(2)?(3)P(0) transitions in the electronic ground state that produced Raman shifts of 158 and 227 cm(-1) were detected. These transitions were observed in a fuel-lean atmospheric H(2) + O(2) flame. By comparing the O electronic and O(2) pure-rotational
C J, Dasch, J H, Bechtel
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