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Showing 1 to 20 of 34 for “"Stimulated raman scattering"”.
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Backward stimulated raman scattering
… and an experimental investigation of the stimulated Raman effect. A new prediction is made for the steady state linewidth of the forward Stokes output in the presence of a depleted pump. The theory is developed with the aim of gaining an understanding of the mechanism which favours …
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Advances in Stimulated Raman Scattering Microscopy via Deep Learning
Stimulated Raman scattering (SRS) microscopy is a powerful chemical imaging technique that acquires images based on the vibrational-spectral “fingerprints” of molecules within an imaged field of view often without the need for exogenous fluorophores or labels. SRS microscopy has found an …
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Discrete frequency chemical imaging with stimulated Raman scattering microscopy
… dissolved analyte in a fluidic system. Coherent Raman scattering (CRS) spectroscopies have gained increasing attention in recent years, as they represent a class of techniques which affords high-resolution, z-stack capable, not-perturbative, rapid chemical imaging. Stimulated Raman scattering …
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Stimulated Raman scattering, lasing, and molecular energy transfer mechanisms in KXe probed by laser spectroscopy
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Hollow optical fibers and W-type fibers for high power sources and suppression of the stimulated Raman scattering
… reported. In addition, the suppression of the stimulated Raman scattering (SRS) in a single-mode high power fiber-based master oscillator power amplifier (MOPA) source, using W-type Yb The suppression of the stimulated Raman scattering (SRS) in a small and single-mode core becomes an issue when …
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Measurement of the nonlinear refractive index (n2) and stimulated Raman scattering in optical fibers as a function of germania content, using the photorefractive beam coupling technique
… are the nonlinear refractive index n_2 and the Raman gain coefficient g_R. These parameters are related to the third order nonlinear susceptibility [x^{(3)}]. In this work, the photorefractive beam coupling technique, also called induced grating autocorrelation (IGA), has been used to measure …
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Enhancement and extinction effects in surface-enhanced stimulated Raman spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is a technique that allows one to probe the vibrational modes of molecules with great precision. However, current methods involve the enhancement of local fields from spontaneous Raman scattering near a metallic substrate. By utilizing stimulated Raman …
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Development of phonon-polarization THz spectroscopy, and the investigation of relaxor ferroelectrics
… (typically LiNbO3 or LiTaO3) via impulsive stimulated Raman scattering as a THz source for spectroscopy: (1) the versatility of phonon-polariton waveform shaping and detection, (2) the ability to use the ionic crystal as a compact, integrated spectroscopic platform, (3) the high THz …
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Coherent lattice and molecular dynamics in ultrafast single-shot spectroscopy
… and solids. Single-shot nonresonant impulsive stimulated Raman scattering (ISRS) measurements in m-iodoanisole and bismuth germanate reveal the existence of transient coherent behavior. High-field resonant excitation of the semimetals bismuth, antimony and tellurium, as well as the …
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Coupled modes analysis of SRS backscattering, with Langmuir decay and possible cascadings
Recent experiments aimed at understanding stimulated Raman scattering (SRS) in ICF laser-plasma interactions, suggest that SRS is coupled to the Langmuir decay interaction (LDI). The effects of LDI on the saturation of the SRS backscattering have been investigated, considering typical parameters …
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Wide-field structured illumination microscopy for fluorescence and pump-probe imaging
… plasmon resonance fluorescence and pump-probe scattering imaging. First, structured illumination microscopy was introduced to surface plasmon resonance fluorescence imaging for high signal-to-noise and high resolution. Secondly, a theoretical framework for three-dimensional wide-field …
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Coherent anti-Stokes Raman spectroscopy of diamond
… performed to investigate Coherent Anti-Stokes Raman Scattering (CARS) in diamond. Aspects of this type of non-linear scattering are presented theoretically, and various experimental configurations were attempted in order to study them. These included the dependence of the CARS signal intensity …
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Vlasov simulations of kinetic enhancement of Raman backscatter in laser fusion plasmas
Stimulated Raman scattering (SRS) is studied in plasmas relevant to inertial confinement fusion (ICF). The Eulerian Vlasov-Maxwell code ELVIS was developed and run for this purpose. Plasma waves are heavily Landau damped in the regimes of interest, and coupled-mode theory predicts back-scattered …
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Phonon-polaritons in bulk and patterned materials
… results of a four-wave mixing impulsive stimulated Raman scattering (ISRS) method to generate and probe polaritons with arbitrary wavevectors is developed. A novel method to generate phonon-polaritons with high amplitudes via focusing is also presented. The motivation for this work is …
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Cladding-pumped Raman fibre laser sources
In this thesis, I investigate cladding-pumped Raman fibre lasers and amplifiers. Such devices, offering a novel way to generate Raman gain, combine the advantages of the hugely successful cladding-pumped rare-earth doped fibre lasers with those of stimulated Raman scattering. They not only inherit …
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Polaritonics : an intermediate regime between electronics and photonics
… rather than currents or photons. Impulsive stimulated Raman scattering (ISRS) is employed for phonon-polariton generation, whereby lattice vibrations are driven by optical femtosecond laser pulses directed into ferroelectric LiNbO3 or LiTaO3. The vibrational amplitude is proportional to the …
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Advanced optical techniques for high capacity transmission
… dispersion, but also higher order dispersion. Stimulated Raman Scattering (SRS) are studied and discussed. Different dispersion maps are performed for all Raman amplified standard fibre link to obtain maximum transmission distances. Raman amplification is used in most of our loop experiments …
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Investigation and characterization of single hot spot laser-plasma interactions
… the Langmuir decay instability (LDI) cascade and stimulated scattering off of an acoustic-like electron mode below the usual electron plasma wave frequency. The LDI is the result of the electron plasma wave (EPW) generated by stimulated Raman scattering (SRS) growing to a sufficient amplitude such …
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Investigation of single-frequency high-power Raman fiber amplifier for guide star application
… of power scaling of core-pumped single-frequency Raman fiber amplifiers operating at 1178 nm. A numerical model was developed that accounts for stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in relation to the fiber mode field diameter, length, seed power, and …
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Thermal and spectral effects in intracavity Raman lasers
Stimulated Raman scattering is a convenient way to extend the spectral coverage of well-established solid-state laser sources. In an intracavity Raman laser, a Raman crystal is placed inside the cavity of the fundamental laser, and the output frequency is red-shifted by an amount corresponding to a …
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