Results 231 to 240 of about 41,207 (287)

Amplified spontaneous Raman scattering in fiber Raman amplifiers

Journal of Lightwave Technology, 1986
Amplified spontaneous Raman scattered light power in forward and backward Raman amplifiers is theoretically and experimentally studied under the assumption of the constant Raman gain coefficient in the bandwidth of an optical filter. On the basis of the results, the power ratio of the amplified signal to amplified spontaneous scattering is discussed ...
K. Mochizuki, N. Edagawa, Y. Iwamoto
openaire   +3 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

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
openaire   +2 more sources

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
openaire   +2 more sources

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
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

Stimulated Raman laser excitation of spontaneous resonance Raman scattering

Chemical Physics Letters, 1980
The efficient conversion of the second and third harmonics of a Nd YAG laser to near UV radiation in the 395–500 nm range by stimulated Stokes (and anti-Stokes) Raman scattering (SRS) in a 1 m Raman oscillator containing compressed H2 or D2 is used as an excitation source for spontaneous resonance Raman spectroscopy (RRS).
Richard P. Van Duyne, Keith D. Parks
openaire   +1 more source