Nonlinear light beam propagation in uniaxial crystals: nonlinear refractive index, self-trapping and self-focusing

1999 ◽  
Vol 2 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Qi Guo ◽  
Sien Chi
Keyword(s):  
Refractive Index ◽  
Light Beam ◽  
Nonlinear Refractive Index ◽  
Beam Propagation ◽  
Self Focusing ◽  
Self Trapping

scholarly journals Nonlinear refractive index of porcine cornea studied by z-scan and self-focusing during femtosecond laser processing

2010 ◽  
Vol 18 (4) ◽  
pp. 3700 ◽  
Author(s):  
M. Miclea ◽  
U. Skrzypczak ◽  
S. Faust ◽  
F. Fankhauser ◽  
H. Graener ◽  
...  
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Nonlinear Refractive Index ◽  
Laser Processing ◽  
Self Focusing ◽  
Femtosecond Laser Processing ◽  
Porcine Cornea

Nonlinear Refractive Index of Silicon Nanoparticles: A Short Review

2014 ◽  
Vol 1 (2) ◽  
pp. 87-97
Author(s):  
Sudakshina Prusty
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Phase Modulation ◽  
Silicon Nanoparticles ◽  
Nonlinear Coefficient ◽  
Short Review ◽  
Self Phase Modulation ◽  
Physical Mechanisms ◽  
Self Focusing ◽  
Physical Phenomena

This article discusses the nonlinear refractive index of silicon nanoparticles starting from the basic formalism to some of the consequent physical phenomena like self focusing and self phase modulation. Several experimental techniques mainly based on Z-scan are discussed to measure the nonlinear refractive index. Another less explored technique for silicon nanoparticles, which studies the far-field optical fringe pattern formed by spatial self-phase modulation, is also discussed. Computation of the nonlinear refractive index is shown in detail by employing these two techniques. While Z-scan can estimate the nonlinear coefficient of a medium in a chosen time scale, the optical fringe method can predict the overall nonlinear refractive index due to all possible physical mechanisms. Some of the recent results for silicon nanoparticles using these two techniques are also discussed.

scholarly journals Studying the Nonlinear Optical Properties of Fluoride Laser Host Materials in the Ultraviolet Wavelength Region

2021 ◽  
Vol 12 (1) ◽  
pp. 372
Author(s):  
Duong Van Pham ◽  
Diep Van Nguyen ◽  
Tu Xuan Nguyen ◽  
Kieu Anh Thi Doan ◽  
Quan Minh Le ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Ultrashort Pulse ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Wavelength Region ◽  
Aluminum Fluoride ◽  
Self Focusing ◽  
Host Materials ◽  
Ultraviolet Wavelength

Fluoride host materials doped with trivalent cerium ions have previously been demonstrated as successful laser materials in the ultraviolet wavelength region. However, the nonlinear optical properties of the fluoride hosts in this wavelength region have not been investigated yet, although nonlinearity could result in undesirable effects such as self-focusing and pulse distortion when these fluoride materials are used as gain media in high-power, ultrashort pulse laser oscillator and amplifier systems. In this work, the nonlinear refractive index of lithium calcium aluminum fluoride (LiCaAlF6), lithium strontium aluminum fluoride (LiSrAlF6), lanthanum fluoride (LaF3), and yttrium lithium fluoride (YLiF4) fluoride host materials are determined using the Kramers–Krönig relation model in the ultraviolet wavelength region. Self-focusing conditions, particularly at the peak laser emission wavelength of these materials, are further analyzed. Results show that LiCaAlF6 has the smallest nonlinear refractive index and self-focusing, making it an ideal host material under the conditions of ultrashort pulse and ultrahigh-power laser generation.

scholarly journals Self-focusing of Laser Beams in Cadmium Manganese Telluride Cd0.4Mn0.6Te

1990 ◽  
Vol 43 (3) ◽  
pp. 303 ◽  
Author(s):  
XD Dai ◽  
Y Ito ◽  
YH Ja
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Cadmium Manganese Telluride ◽  
Thermally Induced ◽  
Focusing Effect ◽  
Self Focusing ◽  
Manganese Telluride ◽  
Diluted Magnetic

Laser beam induced self-focusing in a relatively new diluted magnetic semiconductor cadmium manganese telluride (Cdo.4Mno.6Te) has been observed. We found that a thermally-induced change in nonlinear refractive index is the main mechanism responsible for the self-focusing effect. The nonlinear refractive index has been determined using experimental results.

scholarly journals On relativistic self focusing

1987 ◽  
Vol 5 (1) ◽  
pp. 15-25
Author(s):  
P. H. Y. Lee
Keyword(s):  
Refractive Index ◽  
Relativistic Electron ◽  
Laser Plasma ◽  
Nonlinear Refractive Index ◽  
Laser Intensity ◽  
Ponderomotive Force ◽  
Relativistic Effects ◽  
Electron Motion ◽  
Self Focusing

Ponderomotive force initiated laser self focusing can be enhanced by relativistic electron motion in a laser plasma. We derive the nonlinear refractive index due to relativistic effects and find that relativistic self focusing becomes important for a 0·25 μm laser when the laser intensity exceeds 5 × 1018 W/cm2.

Instability analysis of Gaussian beam propagation in a nonlinear refractive index medium

Open Physics ◽  
2008 ◽  
Vol 6 (4) ◽  
Author(s):  
Chaoying Zhao ◽  
Weihan Tan
Keyword(s):  
Refractive Index ◽  
Gaussian Beam ◽  
Nonlinear Refractive Index ◽  
Thin Filament ◽  
Beam Propagation ◽  
The Self ◽  
Small Scale ◽  
Two Dimensional ◽  
Focal Points ◽  
Instability Analysis

AbstractIn this paper, we use a thin filament two dimensional Gaussian beam to model the self-trapping filament. The instability of the propagation of a Gaussian beam through a nonlinear refractive index media is investigated, theoretically and numerically. Specifically, the small scale instability of the beam is examined. The numerical results show that the propagation of the two dimensional Gaussian beam presents one or more nonlinear focal points.

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

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