scholarly journals Laser-pointer-induced self-focusing effect in hybrid-aligned dye-doped liquid crystals

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Jing Wang ◽  
Yosuke Aihara ◽  
Motoi Kinoshita ◽  
Jun-ichi Mamiya ◽  
Arri Priimagi ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Laser Pointer ◽  
Focusing Effect ◽  
Self Focusing

Small scale self-focusing effect of stacked chirped pulse propagation

2011 ◽  
Vol 23 (1) ◽  
pp. 45-48
Author(s):  
张颖 Zhang Ying ◽  
朱启华 Zhu Qihua ◽  
曾小明 Zeng Xiaoming ◽  
周凯南 Zhou Kainan ◽  
蒋东镔 Jiang Dongbin ◽  
...  
Keyword(s):  
Pulse Propagation ◽  
Small Scale ◽  
Chirped Pulse ◽  
Focusing Effect ◽  
Self Focusing

Verification of resolution on self-focusing effect of polarization-inverted transmitter by up-chirp signal for subaperture array

2018 ◽  
Vol 57 (7S1) ◽  
pp. 07LG04
Author(s):  
Kazuki Abukawa ◽  
Sayuri Matsumoto ◽  
Tomoo Sato ◽  
Kageyoshi Katakura ◽  
Takenobu Tsuchiya ◽  
...  
Keyword(s):  
Chirp Signal ◽  
Focusing Effect ◽  
Self Focusing

Crystal structures and third-order optical properties of three manganese(II) complexes constructed from N-heterocyclic and polycarboxylate ligands

2017 ◽  
Vol 72 (2) ◽  
pp. 125-131
Author(s):  
Zhaoxun Lian ◽  
Ning Zhao ◽  
Ping Liu ◽  
Caixia An ◽  
Fengxia Yang ◽  
...  
Keyword(s):  
Molecular Structures ◽  
Manganese Acetate ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Heterocyclic Ligands ◽  
Third Order ◽  
Single Beam ◽  
Focusing Effect ◽  
The Third ◽  
Self Focusing

AbstractThree new manganese(II) complexes, {[Mn(PTP)]2[Mn(PTP)(H2O)]}(BTA)2·2H2O (1), [Mn(PTP)(ODA)]2 (2), and [Mn(FTP)(ODA)]2·H2O (3), were synthesized by the reactions of manganese acetate and polycarboxylic acid in the presence of N-heterocyclic ligands (where PTP=4′-phenyl-2,2′:6′,2″-terpyridine, H3BTA=benzene-1,3,5-tricarboxylic acid, H2ODA=4,4′-oxydibenzoic acid, FTP=4′-(furan-2-yl)-2,2′:6′,2″-terpyridine). In complex 1, each BTA ligand serves as a μ3-bridge to link three Mn(II) centers, whereas each Mn(II) center is coordinated by two BTA ligands. This connection mode results in a grid sheet. Complexes 2 and 3 have very similar molecular structures with Mn(II) centers connected by ODA ligands to result in ring-like arrays. We investigated the third-order nonlinear optical (NLO) properties of the three complexes by single beam Z-scan techniques. Complexes 1–3 exhibit strong third-order NLO reverse saturable absorption with NLO absorptive indices β=1.32×10−6, 3.01×10−6, and 9.42×10−6 m W−1, respectively. In addition, complex 1 shows all excellent self-focusing effect with an NLO refractive index of γ=1.25×10−12 m2 W−1. The third-order NLO susceptibility χ(3) of the three complexes were calculated as 47.55×10−8, 4.85×10−8, and 15.16×10−8 esu, respectively.

Influence of multiple scattering on self-focusing in nematic liquid crystals

2018 ◽  
Author(s):  
Alessandro Alberucci ◽  
Chandroth P. Jisha ◽  
Serena Bolis ◽  
Jeroen Beeckman ◽  
Stefan Nolte
Keyword(s):  
Liquid Crystals ◽  
Multiple Scattering ◽  
Nematic Liquid Crystals ◽  
Self Focusing

scholarly journals Self focusing of a laser pulse in plasma with periodic density ripple

2009 ◽  
Vol 27 (2) ◽  
pp. 193-199 ◽  
Author(s):  
Sukhdeep Kaur ◽  
A.K. Sharma
Keyword(s):  
Laser Pulse ◽  
Spot Size ◽  
High Plasma ◽  
The Self ◽  
Intense Laser ◽  
Wave Number ◽  
Plasma Parameters ◽  
Density Region ◽  
Focusing Effect ◽  
Self Focusing

AbstractPropagation of an intense laser pulse in plasma with a periodically modulated density is considered using envelope equations. The laser induces modifications of the plasma refractive indexviarelativistic and ponderomotive nonlinearities. In the region of high plasma density, the self focusing effect of nonlinearity suppresses the diffraction divergence, and the laser converges. As the beam enters into the low density region, the diffraction tends to diverge it offsetting the convergence due to the curvature it has acquired. For a given set of plasma parameters, there is a critical power of the laser above which it propagates in a periodically focused manner. Below this power the laser undergoes overall divergence. At substantially higher powers, the laser beam continues to converge until the saturation effect of nonlinearity suppresses the self focusing and diffraction predominates. The effect of density ripple is to cause overall increase in the self focusing length. The minimum spot size decreases with the wave number of the ripple.

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