Nonlinear optical transformation of the polarization state with holographic cut cubic crystals

2009 ◽  
Author(s):  
S. Kourtev ◽  
L. Canova ◽  
N. Minkovski ◽  
A. Jullien ◽  
O. Albert ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Polarization State ◽  
Cubic Crystals ◽  
Optical Transformation

scholarly journals Second order nonlinear optical processes in [111] cubic crystals for terahertz optoelectronics

2018 ◽  
Vol 58 (1) ◽  
Author(s):  
Gwenaël Gaborit ◽  
Federico Sanjuan ◽  
Jean-Louis Coutaz
Keyword(s):  
Laser Beam ◽  
Crystal Orientation ◽  
Nonlinear Optical ◽  
Polarization State ◽  
Spectroscopic Studies ◽  
Optical Rectification ◽  
Electromagnetic Pulses ◽  
Cubic Crystals ◽  
Zinc Blende ◽  
Electro Optic

In this paper, we give an overview of emission and detection of terahertz electromagnetic pulses using, respectively, optical rectification and electro-optic effect in [111] zinc blende crystals. This crystal orientation allows us to generate and read any polarization state of the THz beam only by controlling the polarization state of the laser beam that excites or probes the emitting and receiving crystals. This technique is very useful for polarimetric terahertz spectroscopic studies.

scholarly journals Nonlinear optical spectroscopy and two-photon excited fluorescence spectroscopy reveal the excited states of fluorophores embedded in a beetle’s elytra

2018 ◽  
Vol 9 (1) ◽  
pp. 20180052 ◽  
Author(s):  
Sébastien R. Mouchet ◽  
Charlotte Verstraete ◽  
Dimitrije Mara ◽  
Stijn Van Cleuvenbergen ◽  
Ewan D. Finlayson ◽  
...  
Keyword(s):  
Excited States ◽  
Nonlinear Optical ◽  
Polarization State ◽  
Polarized Light ◽  
Fluorescence Emission ◽  
Biological Tissues ◽  
Optical Measurements ◽  
Fluorescence Signal ◽  
Photonic Structure ◽  
Two Photon

Upon illumination by ultraviolet light, many animal species emit light through fluorescence processes arising from fluorophores embedded within their biological tissues. Fluorescence studies in living organisms are however relatively scarce and so far limited to the linear regime. Multiphoton excitation fluorescence analyses as well as nonlinear optical techniques offer unique possibilities to investigate the effects of the local environment on the excited states of fluorophores. Herein, these techniques are applied for the first time to study of the naturally controlled fluorescence in insects. The case of the male Hoplia coerulea beetle is investigated because the scales covering the beetle’s elytra are known to possess an internal photonic structure with embedded fluorophores, which controls both the beetle’s coloration and the fluorescence emission. An intense two-photon excitation fluorescence signal is observed, the intensity of which changes upon contact with water. A third-harmonic generation signal is also detected, the intensity of which depends on the light polarization state. The analysis of these nonlinear optical and fluorescent responses unveils the multi-excited states character of the fluorophore molecules embedded in the beetle’s elytra. The role of form anisotropy in the photonic structure, which causes additional tailoring of the beetle’s optical responses, is demonstrated by circularly polarized light and nonlinear optical measurements.

scholarly journals Electro-Optic Modulation of Higher-Order Poincaré Beam Based on Nonlinear Optical Crystal

Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 41
Author(s):  
Lu Han ◽  
Zhan Li ◽  
Chao Chen ◽  
Xin Sun ◽  
Junyong Zhang ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Polarization State ◽  
Optical Element ◽  
Higher Order ◽  
Nonlinear Optical Crystal ◽  
Nonlinear Optical Crystals ◽  
Spatially Inhomogeneous ◽  
Electro Optic ◽  
Voltage Signal ◽  
Polarization States

Vector beams (VBs) have spatially inhomogeneous polarization states distribution and have been widely used in many fields. In this paper, we proposed a method to modulate polarization states of higher-order Poincaré (HOP) beams and designed a system based on Mach-Zehnder interferometers, in which polarization state (include azimuth and ellipticity) of generated HOP beams were modulated by linear electro-optic (EO) effect of nonlinear optical crystals. Using this method, the polarization state of generated HOP beams could be controlled by voltage signal applied on EO crystals, which makes the process of the polarization state change with no optical element moving and mechanical vibrations. Besides, due to the flexibility of the voltage signal, the polarization state could be switched directly and immediately.

scholarly journals Some problems of modeling laser-induced filaments

2020 ◽  
Keyword(s):  
Experimental Data ◽  
Silicon Carbide ◽  
Nonlinear Optical ◽  
Cherenkov Radiation ◽  
Optical Breakdown ◽  
Point Of View ◽  
Chain Process ◽  
Chemical Bonds ◽  
Physical Chemical ◽  
Optical Transformation

Experimental data of formation laser-induced filaments in various media (potassium chloride, water, air and silicon carbide) are represented. These phenomena are analyzed as processes of Nonlinear and Relaxed Optics. Problems of modeling the creation the volume laser-induced filaments are investigated. Comparative analysis of plasma, nonlinear optical, diffractive and interference phenomena (including diffractive stratification), shocking processes (including Cherenkov radiation) and physical-chemical processes (including cascade model of excitation the proper chemical bonds in the regime of saturation the excitation), methods and models are represented and discussed. The optical breakdown for various matters has various natures: from shock ionization of gas to disruption of all chemical bonds for solid in the region of interaction light and matter or from nonequilibrium radiated processes in gas and liquid to irreversible phase transformations in solid. For diffraction stratification the modified models of Rayleygh rings was used. We show that this model allow to explain the experimental data for silicon carbide more effectively as Lugovoy-Prokhorov theory of moving foci. Modified Niels and Aage Bohrs models (microscopic) and Golub model (macroscopic) of Cherenkov radiation were used for the explanation of generation continuous radiation. Diffraction stratification shows the surface conic nature of Cherenkov radiation. It was show that physical-chemical method of estimations of corresponding processes is more general as electromagnetic (Kerr media) and one allow explain basic terms of resulting chain process with united point of view. Modified I. Frank model of interference the Cherenkov radiation was used for the explanation laser-induced optical breakdown in silicon carbide. Modified Rayleygh model and methods of continuum mechanics was created and used for the estimation sizes and form of observing nanovoids of silicon carbide. In whole the represented models allow to explain the corresponding chain more fuller and really as other models because one take into account of nonlinear optical transformation of primary laser radiation.

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