Liquid crystals under high-power, nanosecond laser irradiation

2013 ◽  
Author(s):  
Svetlana G. Lukishova
Keyword(s):  
Liquid Crystals ◽  
Laser Irradiation ◽  
High Power ◽  
Nanosecond Laser

Far-Field Patterns from Dye-Doped Planar-Aligned Nematic Liquid Crystals Under Nanosecond Laser Irradiation

2006 ◽  
Vol 453 (1) ◽  
pp. 393-401 ◽  
Author(s):  
Svetlana G. Lukishova ◽  
Nick Lepeshkin* ◽  
Robert W. Boyd ◽  
Kenneth L. Marshall
Keyword(s):  
Liquid Crystals ◽  
Laser Irradiation ◽  
Nematic Liquid Crystals ◽  
Nanosecond Laser ◽  
Far Field ◽  
Field Patterns

NONLINEAR OPTICAL RESPONSE OF CYANOBIPHENYL LIQUID CRYSTALS TO HIGH-POWER, NANOSECOND LASER RADIATION

2000 ◽  
Vol 09 (03) ◽  
pp. 365-411 ◽  
Author(s):  
SVETLANA G. LUKISHOVA
Keyword(s):  
Liquid Crystals ◽  
High Power ◽  
Beam Quality ◽  
Nonlinear Refraction ◽  
Beam Waist ◽  
Laser Resonator ◽  
Nanosecond Laser ◽  
Molecular Reorientation ◽  
Incident Intensity ◽  
Isotropic Liquid

Results from investigations are summarized into: (1) transient refractive and absorptive (two-photon) nonlinearities at 0.532 μm by the Z-scan method, and (2) reflective nonlinearity in the near-IR, of linearly nonabsorbing cyanobiphenyl liquid crystals under nanosecond laser irradiation. (1) For isotropic liquid crystals at the several-nanosecond time scale and several tens-micrometers beam-waist-diameter, transient molecular-reorientation and thermal/density refractive nonlinearities compete in changing the sign of the total transient refractive nonlinearity. For the different, given pulse durations, the influence of coupled thermal and density effects on nonlinear refraction depends, through buildup time, on the beam-waist diameter. Nonlinear absorption coefficients depend on the incident intensity. For planar nematic layers, cumulative effects in heating (and in refractive nonlinearity) were observed even at low, 2–10 Hz pulse repetition rate. These results are useful for optical power limiting applications, and for intensity and beam-quality sensors of pulsed, high-power lasers. (2) Reflective nonlinearity of chiral-nematic (cholesteric) mirrors near selective reflection conditions for circular polarized light at λ=1.064 μm was studied both under free space irradiation and inside a laser resonator. Specially chosen experimental irradiation conditions make it possible to attribute the observed changing of reflectivity to athermal helix unwinding by the optical field. The results can find applications in laser-resonator mirrors, Q-switches and soft apertures for beam-profile formation, and also in showing the limits of use cholesteric optical elements in high-power laser beams.

Photoluminescence properties of KDP crystals under high power nanosecond laser irradiation

2017 ◽  
Author(s):  
Yang Luo ◽  
Guohang Hu ◽  
Yuanan Zhao ◽  
Liujiang Yang ◽  
Yao Shan ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
High Power ◽  
Nanosecond Laser ◽  
Photoluminescence Properties ◽  
Kdp Crystals

scholarly journals Development of an Experimental Platform for Combinative Use of an XFEL and a High-Power Nanosecond Laser

2020 ◽  
Vol 10 (7) ◽  
pp. 2224 ◽  
Author(s):  
Yuichi Inubushi ◽  
Toshinori Yabuuchi ◽  
Tadashi Togashi ◽  
Keiichi Sueda ◽  
Kohei Miyanishi ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
High Power ◽  
Large Angle ◽  
Nanosecond Laser ◽  
Diffraction Measurement ◽  
Single Shot ◽  
X Ray Diffraction ◽  
X Ray ◽  
Experimental Platform

We developed an experimental platform for combinative use of an X-ray free electron laser (XFEL) and a high-power nanosecond laser. The main target of the platform is an investigation of matter under high-pressure states produced by a laser-shock compression. In this paper, we show details of the experimental platform, including XFEL parameters and the focusing optics, the laser irradiation system and X-ray diagnostics. As a demonstration of the high-power laser-pump XFEL-probe experiment, we performed an X-ray diffraction measurement. An in-situ single-shot X-ray diffraction pattern expands to a large angle side, which shows a corundum was compressed by laser irradiation.

scholarly journals Observation of the shock wave propagation induced by a high-power laser irradiation into an epoxy material

2013 ◽  
Vol 46 (23) ◽  
pp. 235501 ◽  
Author(s):  
Romain Ecault ◽  
Laurent Berthe ◽  
Michel Boustie ◽  
Fabienne Touchard ◽  
Emilien Lescoute ◽  
...  
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Laser Irradiation ◽  
High Power ◽  
Shock Wave Propagation ◽  
High Power Laser ◽  
Power Laser ◽  
Epoxy Material

Laser-induced fabrication of porous gold nanoshells

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20108-20112 ◽  
Author(s):  
Tae-Hyeon Park ◽  
Du-Jeon Jang
Keyword(s):  
Raman Scattering ◽  
Laser Irradiation ◽  
High Surface ◽  
Gold Nanoshells ◽  
Nanosecond Laser ◽  
Scattering Efficiency ◽  
Porous Gold ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Hollow and porous gold nanoshells with high surface-enhanced Raman scattering efficiency have been fabricated through utilizing nanosecond laser irradiation.

Phase characteristic of phase-only spatial light modulator under high-power laser irradiation

2021 ◽  
Author(s):  
Yu Takiguchi ◽  
Hiroshi Tanaka ◽  
Tsubasa Watanabe ◽  
Yoshiyuki Ohtake ◽  
Haruyoshi Toyoda
Keyword(s):  
Laser Irradiation ◽  
High Power ◽  
Spatial Light Modulator ◽  
Phase Characteristic ◽  
High Power Laser ◽  
Power Laser ◽  
Light Modulator
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