Alexandros Gerakis
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View article: Coherent Brillouin scattering in weakly ionized plasmas
Coherent Brillouin scattering in weakly ionized plasmas Open
A numerical study on electron, ion, and neutral density perturbation is presented in low-temperature plasma (LTP) sources driven by the frequency detuning of two laser beams. Our study is performed in the hydrodynamic regime, which is vali…
View article: Mass-spectrometry via oscillatory motion in deep pulsed optical lattices
Mass-spectrometry via oscillatory motion in deep pulsed optical lattices Open
We describe a new optical diagnostic for determining the composition of gases by measuring the motion of atoms and molecules trapped within very deep optical lattices. This non-resonant method is analogous to conventional Raman scattering,…
View article: Effects of the chirp rate on single-shot coherent Rayleigh-Brillouin scattering
Effects of the chirp rate on single-shot coherent Rayleigh-Brillouin scattering Open
Single-shot coherent Rayleigh-Brillouin scattering (CRBS) is modeled using direct simulation Monte Carlo (DSMC). In CRBS, an optical lattice generated by the interference of two pump lasers traps the neutral particles via the dipole force.…
View article: Analysis of an induced Langmuir wave by ponderomotive forces and its applicability for plasma diagnostics
Analysis of an induced Langmuir wave by ponderomotive forces and its applicability for plasma diagnostics Open
We present a numerical study on the electron and ion density perturbation in low-temperature plasmas driven by the frequency detuning of two intense laser beams. Our study is performed in the hydrodynamic regime, which becomes applicable w…
View article: Combination of ICCD fast imaging and image processing techniques to probe species–specific propagation due to guided ionization waves
Combination of ICCD fast imaging and image processing techniques to probe species–specific propagation due to guided ionization waves Open
The present report is devoted to the study of distinct ionization waves in terms of temporally-, spatially-, and wavelength-resolved analyses. The study is based on the technique of two-dimension fast imaging. However, appropriately select…
View article: Self-aligning deflector device for transmission line offset correction
Self-aligning deflector device for transmission line offset correction Open
Disclosed is a self-aligning mirror device for transmission line offset correction. The disclosed self-aligning mechanism automatically adjusts deflectors to couple radiation between two or more offset waveguides or optical fibers.
View article: Torr-level, seedless, non-resonant velocity distribution function measurement with a dual-color, single-shot coherent Rayleigh–Brillouin scattering scheme
Torr-level, seedless, non-resonant velocity distribution function measurement with a dual-color, single-shot coherent Rayleigh–Brillouin scattering scheme Open
A two order of magnitude spectral acquisition improvement in velocity distribution function measurement is demonstrated with a novel single-shot, dual-color coherent Rayleigh–Brillouin scattering (CRBS) scheme. By performing this non-reson…
View article: Development of theory and experimental operational framework for Coherent Thomson Scattering (Final Technical Report)
Development of theory and experimental operational framework for Coherent Thomson Scattering (Final Technical Report) Open
The research carried out explored and proved the feasibility and operational framework of a new diagnostic technique termed Coherent Thomson Scattering (CTS) for electrons in a low temperature plasma. The work is performed in collaboration…
View article: Dual color, frequency, pulse duration and shape agile laser system for particle spectroscopy and manipulation
Dual color, frequency, pulse duration and shape agile laser system for particle spectroscopy and manipulation Open
A dual color, frequency and pulse duration agile laser system, capable of delivering laser pulses in arbitrary temporal profiles with ∼1 ns to ∼1 µs pulse duration, chirping rates of ∼27 MHz/ns with an achievable chirping range of several …
View article: A dual color, frequency, pulse duration and shape agile laser system for particle spectroscopy and manipulation
A dual color, frequency, pulse duration and shape agile laser system for particle spectroscopy and manipulation Open
A dual color, frequency and pulse duration agile laser system, capable of delivering laser pulses in arbitrary temporal profiles with ~1 ns to ~1 us pulse duration, chirping rates of ~27 MHz/ns with an achievable chirping range of several …
View article: Analysis of coherent Thomson scattering from a low temperature plasma
Analysis of coherent Thomson scattering from a low temperature plasma Open
The spectrum of coherent Thomson scattering (CTS) induced by a periodic ponderomotive perturbation in a low-density low temperature plasma is considered. The analysis is performed for the case when the period of the resulting optical latti…
View article: Raman mass-spectrometry via oscillatory motion in deep pulsed optical lattices
Raman mass-spectrometry via oscillatory motion in deep pulsed optical lattices Open
We describe a new optical diagnostic for determining the composition of gases by measuring the motion of atoms and molecules trapped within very deep optical lattices. This non-resonant method is analogous to conventional Raman scattering,…
View article: High-speed fiber-based spectrometer for plasma Thomson scattering
High-speed fiber-based spectrometer for plasma Thomson scattering Open
We present a novel concept for a Thomson scattering diagnostic, based on a high-speed fiber optic spectrometer. The high-speed fiber optic spectrometer presented here translates a spectral measurement from the frequency domain into the tim…
View article: Measurement of temperature dependent absorption coefficient of water at 1064nm wavelength
Measurement of temperature dependent absorption coefficient of water at 1064nm wavelength Open
Measurements of the water absorption coefficient at a laser wavelength of 1064 nm are reported as a function of water temperature. A low power laser beam was used as the probe. The measurement net procedure took into consideration the abso…
View article: Four-Wave-Mixing Approach to <i>In Situ</i> Detection of Nanoparticles
Four-Wave-Mixing Approach to <i>In Situ</i> Detection of Nanoparticles Open
Here, we report on the development and experimental validation of a laser-based technique which uses coherent Rayleigh-Brillouin scattering (CRBS) to detect nanoparticles with characteristic sizes ranging from the atomic scale to tens of n…
View article: Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering
Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering Open
We measure the coherent Rayleigh-Brillouin scattering (CRBS) signal integral as a function of the recorded gas pressure in He, Co2, SF6, and air, and we confirm the already established quadratic dependence of the signal on the gas density.…
View article: Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering
Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering Open
We measure the coherent Rayleigh-Brillouin scattering (CRBS) signal integral as a function of the recorded gas pressure in He, Co2, SF6, and air, and we confirm the already established quadratic dependence of the signal on the gas density.…