Results 31 to 40 of about 41,207 (287)

Raman Spectroscopy Techniques for the Investigation and Diagnosis of Alzheimer's Disease

Frontiers in Bioscience-Scholar, 2022
Alzheimer’s disease (AD) is the most common neurodegenerative disorder, resulting in memory loss, cognitive decline, bodily function impairment, and finally death.
Panagis Polykretis, Martina Banchelli, Cristiano D’Andrea, Marella de Angelis, Paolo Matteini   +4 more
doaj   +1 more source

Photon-pair generation by non-instantaneous spontaneous four-wave mixing [PDF]

, 2017
We present a general model, based on a Hamiltonian approach, for the joint quantum state of photon pairs generated through pulsed spontaneous four-wave mixing, including nonlinear phase-modulation and a finite material response time.
Christensen, Jesper B., Koefoed, Jacob G., Rottwitt, Karsten   +2 more
core   +2 more sources

Alcoholic Fermentation Monitoring and pH Prediction in Red and White Wine by Combining Spontaneous Raman Spectroscopy and Machine Learning Algorithms

Beverages, 2021
In the following study, total sugar concentrations before and during alcoholic fermentation, as well as ethanol concentrations and pH levels after fermentation, of red and white wine grapes were successfully predicted using Raman spectroscopy ...
Harrison Fuller, Chris Beaver, James Harbertson   +2 more
doaj   +1 more source

Dissipative Preparation of Spin Squeezed Atomic Ensembles in a Steady State [PDF]

, 2012
We present and analyze a new approach for the generation of atomic spin squeezed states. Our method involves the collective coupling of an atomic ensemble to a decaying mode of an open optical cavity.
A. M. Childs, C. Gardiner, Emanuele G. Dalla Torre, Eugene Demler, Johannes Otterbach, Mikhail D. Lukin, Vladan Vuletic   +6 more
core   +2 more sources

High-Precision Trace Hydrogen Sensing by Multipass Raman Scattering

Sensors, 2023
Despite its growing importance in the energy generation and storage industry, the detection of hydrogen in trace concentrations remains challenging, as established optical absorption methods are ineffective in probing homonuclear diatomics.
Jaspreet Singh, Andreas Muller
doaj   +1 more source

Effects of Raman scattering and attenuation in silica fiber-based parametric frequency conversion

, 2017
Four-wave mixing in the form of Bragg scattering (BS) has been predicted to enable quantum noise less frequency conversion by analytic quantum approaches.
Friis, Søren M. M., Mejling, Lasse, Rottwitt, Karsten   +2 more
core   +1 more source

Spontaneous Raman Scattering in Optical Fiber: Experimental Measurement [PDF]

AIP Conference Proceedings, 2008
Fiber sensors are the state of the art in distributed sensors. The basic effects for distributed sensors of temperature and strain are related with nonlinear optics. However, the development of this equipment require a well established knowledge about the characteristics effects involved and how they change the spectral distribution of the light: its ...
L. A. Ribeiro, S. F. Quirino, A. O. Toledo, C. L. Barbosa, O. Lisboa, J. U. Arruda, Cristiano M. B. Cordeiro, Christiano J. S. de Matos   +7 more
openaire   +2 more sources

Raman Cooling of Solids through Photonic Density of States Engineering

, 2015
The laser cooling of vibrational states of solids has been achieved through photoluminescence in rare-earth elements, optical forces in optomechanics, and the Brillouin scattering light-sound interaction.
Bahl, Gaurav, Chen, Yin-Chung
core   +1 more source

Correlated photon pair generation in low-loss double-stripe silicon nitride waveguides

, 2016
We demonstrate correlated photon pair generation via spontaneous four-wave mixing in a low-loss double-stripe silicon nitride waveguide with a coincidence-to-accidental ratio over 10.
Eggleton, Benjamin J., Xiong, Chunle, Zhang, Xiang, Zhang, Yanbing   +3 more
core   +1 more source

Coherent Anti-Stokes Hyper-Raman Spectroscopy

Nature Communications
Coherent Raman scattering spectroscopies have been established as a powerful tool for investigating molecular systems with high chemical specificity. The existing coherent Raman scattering techniques detect only Raman active modes, which are a part of ...
Kazuki Inoue, Masanari Okuno
doaj   +1 more source