We report on the first observation of Raman lasing near 630 nm from 532-nm-pumped, glycerolwater microdroplets on a superhydrophobic surface. Results of cavity-enhanced Raman scattering and Raman lasing experiments are described. ©2008 Optical Society of America OCIS codes: 140.3550 Lasers, Raman; 350.3950, Micro-optics; 230.3990, Microstructure devices; 230.5750, Resonators; 190.5650, Raman Ef...

Femtosecond Raman spectroscopy has been developed to investigate ultrafast photoinduced structural changes of materials. Vibrational modes in the photogenerated transient species are measured by stimulated Raman scattering using a Raman pump pulse with narrow bandwidth and a femtosecond supercontinuum probe pulse. The Raman signal can be measured without slowing the temporal response and broade...

We present a theory of low-frequency Raman scattering in glasses, based on the concept that light couples to the elastic strains via spatially fluctuating elasto-optic (Pockels) constants. We show that the Raman intensity is not proportional to the vibrational density of states (as was widely believed), but to a convolution of Pockels constant correlation functions with the dynamic strain susce...

Surfaced-enhanced Raman scattering (SERS) of 4,4'-biphenyldithiol (BPDT) has been investigated at a silver island film. Ordinary Raman (OR) spectra of neat sample in solid state and in basic solution have also been taken for comparison. The spectral feature in the SERS spectrum was similar to that for the OR spectrum in basic solution, except for the broadening of ring stretching bands indicati...

A dual-modal approach using Raman spectroscopy and optical pH sensing was investigated to discriminate between normal and cancerous tissues. Raman spectroscopy has demonstrated the potential for in vivo cancer detection. However, Raman spectroscopy has suffered from strong fluorescence background of biological samples and subtle spectral differences between normal and disease tissues. To overco...

Simultaneous stimulated Raman scattering (SRS) and second harmonic generation (SHG) are demonstrated in periodically poled lithium niobate (PPLN). Using a simple single-pass geometry, conversion efficiencies of up to 12% and 19% were observed for the SRS and SHG processes respectively. By changing the PPLN period interacting with the photonic crystal fibre based pump source and varying the PPLN...

M. M. Qazilbash,1,2,* A. Koitzsch,1,† B. S. Dennis,1 A. Gozar,1,‡ Hamza Balci,2 C. A. Kendziora,3 R. L. Greene,2 and G. Blumberg1,§ 1Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA 2Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA 3United States Naval Research Laboratory, Code 6365, Washington D.C....

Vol. XL (November 2003), 375–388 375 *Prasad A. Naik is Associate Professor of Marketing, Graduate School of Management, University of California, Davis (e-mail: panaik@ucdavis. edu). Kalyan Raman is Professor of Marketing, School of Management, University of Michigan, Flint (e-mail: [email protected]). The authors benefited from the suggestions of seminar participants at Columbia University;...

J. Polk, S. Smrekar, S. M. Clegg, R. C. Wiens, M. D. Dyar, A. Treiman. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA, 91109, [email protected], [email protected], [email protected], [email protected], [email protected], Los Alamos National Laboratory, P.O. Box 1663 MS J565, Los Alamos, NM 87545, sc...

Raman spectroscopy is applied to diagnose nanoparticle presence and characteristics in a gaseous flow field. Specifically, in situ monitoring of the Raman-active modes of TiO2 and Al2O3 nanoparticles in aerosol form is demonstrated in high-temperature flame environments. This technique serves as a sensitive and reliable way to characterize particle composition and crystallinity (e.g. anatase ve...