Pulsed spontaneous Raman-scattering measurements in a highly luminous flow

by W. L Flower

Publisher: Dept. of Energy, Sandia Laboratories, Publisher: for sale by the National Technical Information Service] in Albuquerque, N.M, [Springfield, Va

Written in English
Published: Pages: 39 Downloads: 683
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Subjects:

  • Raman spectroscopy

Edition Notes

StatementW. L. Flower, Combustion Physics Division, Sandia Laboratories, D. P. Aeschliman, Laser Applications and Spectroscopy Division, Sandia Laboratories ; prepared by Sandia Laboratories for the United States Department of Energy
SeriesSAND ; 78-8263
ContributionsAeschliman, D. P., joint author, United States. Dept. of Energy, Sandia Laboratories, Sandia Laboratories. Laser Applications and Spectroscopy Division, Sandia Laboratories. Combustion Physics Division 8351
The Physical Object
Pagination39 p. :
Number of Pages39
ID Numbers
Open LibraryOL14883316M

We present a ber-format picosecond light source for coherent anti-Stokes Raman scattering microscopy. Pulses from an Yb-doped ber ampli er are frequency-converted by four-wave mixing in normal dispersion photonic crystal ber to produce a synchronized two-color picosecond pulse train. We show that seeding the. Mar 25,  · A stimulated Raman scattering microscope with near-infrared picosecond laser pulses at high repetition rates (76 MHz) and radio-frequency lock-in detection is accomplished. Book L D and Xie X S Appl. Phys. Lett. 80 Crossref Spectroscopic stimulated Raman scattering imaging of highly dynamic specimens through matrix completion. Direct extraction of Raman line-shapes from congested CARS spectra Erik M. Vartiainen spontaneous Raman scattering spectrum. It circumvents the challenges Cheng, A. Volkmer, L. D. Book, and X. S. Xie, "Multiplex coherent anti-Stokes Raman scatteringCited by: Abstract The effect of strain on the phonon modes of monolayer and few-layer MoS 2 has been investigated by observing the strain-induced shifts of the Raman-active modes. Uniaxial strain was applied to a sample of thin-layer MoS 2 sandwiched between two layers of optically transparent polymer. The resulting band shifts of the E 2g 1 (˜cm-1) and A 1g (˜cm-1) Raman modes were found.

Mid-infrared Raman sources based on spontaneous Raman scattering have been demonstrated in a 15 µm diameter glass-clad crystalline germanium optical fiber and in a germanium-wire. A quantum cascade laser was used as pump at a wavelength of µm. Because of their ultra-high optical nonlinearities and extremely broad transparency window, germanium core fibers offer the possibility of Cited by: Raman spectroscopy is a spectroscopic technique used in condensed matter physics and chemistry to study vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering, or Raman scattering of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range. The laser light interacts with phonons or other excitations in the. TD 5: Raman Scattering in an optical fiber The stimulated Raman scattering (SRS) corresponds to the conversion of a laser beam at ν P to a beam whose frequency is shifted to ν S = ν P – Ω (Stokes wave). Ω is associated to a vibrational transition in the non-linear medium. This contains 94 papers on Scattering of Light. They cover Molecular Scattering, Colloid Scattering, Raman Scattering, Brillouin Scattering and also X-ray and Compton Scattering. This volume also has in it the celebrated monographMolecular Diffraction of Light(), the famous papers on the color of the sea, the first lecture on the Raman Effect, entitledA New Radiation() and the Nobel.

This lesson demonstrates the light amplification caused by the stimulated Raman scattering effect. The layout and its global parameters are shown in Figure 1. Figure 1: Layout and global parameters Figure 2 shows the setup for the optical fiber component. Figure 2: Setup parameters The spectrum of the input signal consists of a strong pump More Info. Raman scattering is a two-photon linear inelastic light scattering process. The elastic counterpart is the well-known Rayleigh scattering process. In spontaneous Raman scattering the light is emitted in random directions (although for polarized light there may be preferred directions, depending also . spontaneous Raman scattering, This paper mainly aims at a comparative study between methane and hydrogen in terms of their relative intensity distribution of the Stimulated Raman Spectra and the wavelength Relative Intensity Distribution of SRS used for this study is of high purity (%). a 50 times higher Raman scattering cross section than the ‘‘diamond band’’ at cm Using the results of Wada and Solin11 Nemanich et al discussed Raman scattering of DLC thin films based on a carbon composite model. They concluded that the Raman scattering of DLC is similar to microcrystalline graphite from their measurements.

Pulsed spontaneous Raman-scattering measurements in a highly luminous flow by W. L Flower Download PDF EPUB FB2

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[W L Flower; D P Aeschliman; United States. Department of Energy.; Sandia Laboratories.; Sandia Laboratories. Laser Applications and Spectroscopy Division.

Raman spectroscopy (/ ˈ r ɑː m ən /); named after Indian physicist C. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified.

The application of spontaneous vibrational Raman scattering for temperature measurements in high pressure laminar flames Article (PDF Available) in Combustion Science and Technology (5) · May. Raman scattering or the Raman effect / ˈ r ɑː m ən / is the inelastic scattering of photons by matter, meaning that there is an exchange of energy and a change in the light's direction.

Typically this involves vibrational energy being gained by a molecule as incident photons from a. This difference between species temperatures violates the two-temperature assumption often used in the modeling of high-temperature non-equilibrium flow.

A new technique was developed to obtain spontaneous Raman scattering temperature measurements from a single laser mcgivesback.com: Heath Heinrich Reising. Observation of spontaneous Raman scattering in silicon slow-light photonic crystal waveguides J.

McMillan,1,a Mingbin Yu,2 Dim-Lee Kwong,2 and C. Wong1 1Optical Nanostructures Laboratory, Columbia University, New York, New YorkUSA 2Institute of Microelectronics, 11 Science Park Road, SingaporeSingapore Received 23 July ; accepted 18 November ; published Cited by: The spontaneous Raman linewith Δv of the v 1 mode of gaseous CF 4 is determined from 30 to amagat by comparison of stimulated Raman scattering threshold intensity measurements performed with picosecond and nanosecond laser excitation.

At high densities Δv = cm −1 is constant. A possible explanation of this effect is given in terms of collisional narrowingCited by: 2. Enhanced spontaneous Raman scattering and gas composition analysis using a photonic crystal fiber Michael P.

Buric,1,2 Kevin P. Chen,1,2 Joel Falk,1,2,* and Steven D. Woodruff1 1National Energy Technology Laboratory, Collins Ferry Road, Morgantown, West VirginiaUSA 2Department of Electrical and Computer Engineering, University of Pittsburgh, Benedum Hall. PIV, 2D-LIF and 1D-Raman Measurements of Flow Field, Composition and Temperature in Premixed Gas Turbine Flames Conference Paper in Experimental Thermal and.

limitations and accuracy for low-signal applications such as Raman scattering. This paper will focus on quantifying the precision and accuracy of Raman/Rayleigh scattering measurements of major species, temperature, and mixture fraction using our CMOS-based 1D Raman/Rayleigh system in a series of near-adiabatic H2/air flames and turbulent.

The results of both axial and radial surveys for a range of flow conditions are compared to results obtained from stagnation pressure, stagnation temperature and Pitot pressure measurements. ROTATIONAL RAMAN SCATTERING The scattering of a laser beam of frequency vo from a small volume containing a variety of molecular species can occur at the Cited by: Spontaneous Raman Scattering (SRS) System for Calibrating High-Pressure Flames Became Operational A high-performance spontaneous Raman scattering (SRS) system for measuring quantitative species concentration and temperature in high-pressure flames is now operational.

The system is located in Glenn’s Engine Research Building. Raman scattering. Raman scattering from nitrogen is also investigated. Several researchers have pursued hydrogen leak detection based on Raman scattering. Adler-Golden et al.2 designed a system based on spontaneous Raman spectroscopy.

The gas to be diagnosed needed to be collected and passed through a gas cell, precluding in-situ measurements. A non-intrusive measurement technique based on spontaneous Raman imaging was proposed for investigating microscale flow structures.

It has the advantage that it does not require tracer particles or fluorescent dye to measure fluid velocity and scalar mcgivesback.com by: 3.

A first problem related to the application of Spontaneous Raman Scattering to a micro – burner is the necessity to provide optical access to the combustion chamber: this issue was resolved by opening a small, mm wide rectangular opening on the burner side, thus permitting temperature measurements along the burner axis.

Nov 01,  · Spontaneous Raman scattering spectroscopy and microscopy of microalgae. The algal cell used was Coccomyxa sp.

(strain C), grown under nitrogen-depleted conditions to promote triglyceride (TAG) (lipid) accumulation. Lipid has many Raman peaks, which can be seen in Table mcgivesback.com by: Raman and Coherent anti-Stokes Raman Scattering (CARS) Spectroscopy and Imaging Selected Topics in Biophotonics (EAD) James Chan, Ph.D.

Lawrence Livermore National Laboratory NSF Center for Biophotonics Science and Technology (CBST) January 29, RAMAN SCATTERING TEMPERATURE MEASUREMENTS fOR WATER VAPOR IN NONEQUILIBRIUM DISPERSED TWO-PHASE FLOW by Charles M.

Anastasia A Thesis Presented to the Graduate Committee of Lehigh University in Candidacy for the Degree of Master of Science in Mechanical Engineering Lehigh University June Spectrally modulated stimulated Raman scattering imaging with an angle-to-wavelength pulse shaper Delong Zhang,1,4 Mikhail N.

Slipchenko,2,4 Daniel E. Leaird,3 Andrew M. Weiner,3,5 Ji-Xin Cheng1,2,* 1Department of Chemistry, Purdue University, Oval Drive, West Lafayette, INUSA 2Weldon School of Biomedical Engineering, S. Martin Jischke Drive, West Lafayette, INUSA.

Jun 03,  · Raman scattering provides chemical selectivity, but the Raman signal from tissues is often overwhelmed by the autofluorescence background. With coherent addition of the scattering fields, coherent anti-Stokes Raman scattering (CARS) provides a much larger signal level than spontaneous Raman mcgivesback.com by: Abstract.

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 population mcgivesback.com to the small raman scattering cross sections and the envolved relaxation time constants these experiment are rather inefficient and require a picosecond Author: H.

Graener, M. Hofmann. •With a known ~ cm2 for one C-H bond, the total spontaneous Raman scattering cross sections of 3 bonds will add up to a cross section of 3 cm2. Given a laser waist area of cm2, one would expect to produce a relative spontaneous Raman signal of ΔI mcgivesback.com /I p = (3 cm2)/(cm2) ~ 3 IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL.

QE, NO. 5, MAY Spontaneous and Stimulated Raman Scattering in Long Low Loss Fibers Abstract-This paper considers the problem of forward Raman scat- tering process in a single transverse mode fiber. For the optical experiments (Raman scattering and photoluminescence), liquids were transferred in Quartz Suprasil cells of 3,5 ml inner volume (Hellma) Raman scattering experiment Raman scattering was excited with an Argon laser (Stabilite, Spectra Physics, λ=nm, power level of mW focused with a µm diameter beam in the middle of theCited by: Abstract: We investigate (a) spontaneous Raman scattering of classical signals in long optical fiber links leading to significant Raman noise in quantum channels propagating in the same fiber and (b) impact of chromatic dispersion on the performance of high quantum bit rate QKD systems.

One way of decreasing Raman noise is to decrease the classical. Nov 27,  · A non-intrusive and spatially resolved temperature measurement technique based on spontaneous Raman imaging was developed to measure two-dimensional temperature distributions in microfluidic systems. Raman scattering arising from OH stretching vibrations of H2O molecules was used to measure the local channel flow temperature because of its high sensitivity to temperature.

The OH Cited by: 2. We perform stimulated emission depletion (STED) microscopy with a novel light source consisting of a fiber-amplified, frequency doubled laser operating with a 1 MHz repetition rate and a nm output coupled into a standard single mode fiber to produce a tunable spectrum of discrete peaks via stimulated Raman scattering (SRS).Cited by: Efficiency of evanescent excitation and collection of spontaneous Raman scattering near high index contrast channel waveguides Ashim Dhakal,* Ali Raza, Frédéric Peyskens, Ananth Z.

Subramanian, Stéphane Clemmen, Nicolas Le Thomas and Roel BaetsCited by: Spectra with simultaneous peaks of CO2, O2, N2, CH4, and H2O are taken by the use of spontaneous Raman scattering from free jets and a turbulent CH4 diffusion flame.

A narrow-band XeCl excimer laser working at nm and an intensified multichannel camera are used to give full information about all major species and the spectral background. The measurements were taken with a nm wavelength from a Nd‐YAG CW laser coupled in a 2,7 km monomode optical fiber.

Several spectrum were taken in the range of 20 mW till mW, also the ratio power output/power input was observed in that mcgivesback.com: L.

Ribeiro, S. Quirino, A. Toledo, C. Barbosa, O. Lisboa, J. Arruda. The spontaneous Raman scattering cross sections of the main peaks (related to the A1 vibrational mode) in rapid and conventional grown potassium dihydrogen phosphate and deuterated crystals are measured at nm, nm, and nm.

The measurement involves the use of the Raman line of water centered at cm−1 as a reference to obtain relative values of the cross sections which are.Mid-infrared Raman sources using spontaneous Raman scattering in germanium core optical fibers Pengfei Wang,1,2,a) Christy Charlton O’Mahony,3 Timothy Lee,1 Rand Ismaeel,1 Thomas Hawkins,4 Yuliya Semenova,2 Lin Bo,2 Qiang Wu,2 Colette McDonagh,3 Gerald Farrell,2 John Ballato,4 and Gilberto Brambilla1 1Optoelectronics Research Centre, University of Southampton, Southampton .The University of Texas at Dallas Erik Jonsson School PhoTEC c C.

D. Cantrell (05/) STIMULATED RAMAN SCATTERING (3) • W ork done per molecule by a slowly-turned-on external field in inducing a.