Change in the Optical Properties Near the Interface of Self-Focusing Nonlinear Media Depending on the Intensity of a Localized Light Beam

AbstractThe method of paraxial complex geometrical optics (PCGO) is presented, which describes Gaussian beam (GB) diffraction and self-focusing in smoothly inhomogeneous and nonlinear saturable media of cylindrical symmetry. PCGO reduces the problem of Gaussian beam diffraction in nonlinear and inhomogeneous media to the system of the first order ordinary differential equations for the complex curvature of the wave front and for GB amplitude, which can be readily solved both analytically and numerically. As a result, PCGO radically simplifies the description of Gaussian beam diffraction in inhomogeneous and nonlinear media as compared to the numerical and analytical methods of nonlinear optics. The power of PCGO method is presented on the example of Gaussian beam evolution in logarithmically saturable medium with either focusing and defocusing refractive profile. Besides, the influence of initial curvature of the wave front on GB evolution in nonlinear saturable medium is discussed in this paper.

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Semiclassical dynamics and coherent soliton condensates in self‐focusing nonlinear media with periodic initial conditions

Studies in Applied Mathematics ◽

10.1111/sapm.12321 ◽

2020 ◽

Vol 145 (3) ◽

pp. 325-356

Author(s):

Gino Biondini ◽

Jeffrey Oregero

Keyword(s):

Initial Conditions ◽

Nonlinear Media ◽

Self Focusing ◽

Semiclassical Dynamics

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Renormalization-group approach to the problem of light-beam self-focusing

Physical Review A ◽

10.1103/physreva.61.033809 ◽

2000 ◽

Vol 61 (3) ◽

Cited By ~ 19

Author(s):

V. F. Kovalev ◽

V. Yu. Bychenkov ◽

V. T. Tikhonchuk

Keyword(s):

Renormalization Group ◽

Light Beam ◽

Group Approach ◽

Self Focusing ◽

Renormalization Group Approach

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New Self-Focusing Materials: Synthesis, Structures and Nonlinear Optical Properties of Butterfly Shaped Clusters

MRS Proceedings ◽

10.1557/proc-374-151 ◽

1994 ◽

Vol 374 ◽

Cited By ~ 1

Author(s):

S. Shi ◽

X. Q. Xin

Keyword(s):

Optical Properties ◽

Nonlinear Absorption ◽

Nonlinear Optical ◽

Nonlinear Optical Properties ◽

Acetonitrile Solution ◽

Materials Synthesis ◽

Third Order ◽

Nlo Property ◽

Self Focusing ◽

532 Nm

AbstractCompounds WCu2OS3(PPh3)4 (I) and MoCu2OS3(PPh3)3 (II) were synthesized by reactions of (NH4)2MO2S2 (M = W, Mo), Cu2S and PPh3 in solid state for nonlinear optical studies. A wide transparent window (λ = 400 - 1000 nm) was observed for both clusters, which makes them attractive for nonlinear optical (NLO) applications. NLO properties of the clusters were studied with a 7-ns pulsed laser at 532 nm. Cluster I exhibits mainly optical self-focusing (n2 = 8 × 10-18 m2 W-1, as measured with an 1.2 × 10-4 M acetonitrile solution) with negligibly small nonlinear absorption. Cluster II exhibits both optical self-focusing (n2 = 5 × 10-17 m2 W-1, as measured with a 7.4 × 10-5 M acetonitrile solution) and nonlinear absorption (α2 = 2.6 × 10-10 m W-1). The third-order NLO susceptibilities (χ(3)) of the two clusters at the above-mentioned concentrations are 2 × 10-11 esu for I and 1.2 × 10-10 esu for II respectively. These nonlinear optical properties of the clusters were compared with those of cubic cage shaped and nest shaped clusters to reveal a qualitative structure/NLO property correlation.

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

Applied Sciences ◽

10.3390/app12010372 ◽

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.

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