Home About us Contact
|
Home About us Contact | ||
|
|
||
Saturable Absorption (saturable + absorption)
Selected AbstractsPreparation, physicochemical and third order nonlinear optical properties of bis(tetrabutylammonium)bis(2-thioxo-1,3-dithiole-4,5-dithiolato)mercurate(II)CRYSTAL RESEARCH AND TECHNOLOGY, Issue 6 2009X. Q. Wang Abstract Bis(tetrabutylammonium)bis(2-thioxo-1,3-dithiole-4,5-dithiolato)mercurate(II) was prepared and characterized by elemental analyses, electronic absorption, infrared and X-ray powder diffraction spectroscopy. The specific heat of the crystal was measured to be 1878.2 J.mol,1K,1 at 300 K. The thermal decomposition process was investigated by means of thermogravimetric analysis and differential thermal analysis measurements in air together with infrared and X-ray powder diffraction spectra. The third-order nonlinear optical properties at 800 nm were measured by femtosecond optical Kerr gate technique by using CS2 as reference. The third-order optical susceptibility of its acetone solution at the concentration of 9.27 × 10,4 M was obtained to be 2.53 × 10,14 esu. The second-order hyperpolarizability was estimated to be 1.7 × 10,32 esu and the response time was about 226 fs. The third order nonlinear optical properties at 532 nm were investigated by using the Z-scan technique with 20 ps. It exhibited self-focusing effect and saturable absorption. The second molecular hyperpolarizability was estimated to be 8.4 × 10,32 esu. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Stilbene-containing polyactylenes: Molecular design, synthesis, and relationship between molecular structure and NLO propertiesJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 13 2008Xinyan Su Abstract Polyacetylenes (P1,P4) containing different stilbene groups, [(CHC) PhCHCHPhR]n(ROCmH2m+1 (m = 4 (P1), 10 (P2), 16 (P3)), or NO2 (P4)) were designed and synthesized, respectively, using [Rh(nbd)Cl]2 as a catalyst. Their structures and properties were characterized and evaluated by FTIR, 1H-NMR, 13C-NMR, GPC, and UV, PL, respectively. The optical limiting and nonlinear optical properties were investigated by using a frequency doubled, Q-switched, mode-locked Continuum ns/ps Nd:YAG laser system and their optical limiting mechanism was discussed. It is surprising to see that the stilbene pendants endow the polyacetylenes with a high thermal stability (Td , 270 °C), novel optical limiting properties and large third-order nonlinear optical susceptibilities (up to 4.61 × 10,10 esu). The optical limiting mechanism is mainly originated from reverse saturable absorption of molecules. In addition, it is found that the polymer with electron accepted NO2 moiety exhibits better optical properties than that with electron donated alkoxy group because of larger , electron delocalization and dipolar effect. The strong interaction between stilbene pendants and the polyene main chain significantly results in red-shift of fluorescence emitting peak. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4529,4541, 2008 [source] Characterization of highly stacked InAs quantum dot layers on InP substrate for a planar saturable absorber at 1.5 µm bandPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 3 2006Jun Inoue Abstract We examined the absorption saturation properties in the 1.5 µm band of novel highly stacked InAs quantum dot layers. The transmission change at vertical incidence based on the saturable absorption of the quantum dots was more than 1%. This value is as large as the reflection changes of previously reported 1-µm-band quantum dot saturable absorber with interference enhancement. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Synthesis, Structure and Optical Limiting (OL) Properties of a Novel Incomplete Cubane-like Cluster [PPh4] [(,5 -C5Me5) WS3 -(CuBr) (Cul)2 (,-dppm)]CHINESE JOURNAL OF CHEMISTRY, Issue 12 2003Hong Yu Abstract Reaction of [PPh4][,5 -C5Me5)WS3] with Cul, CuBr and bis-(diphenylphosphino)methane (dppm) (molar ratio = 1:2:1:1) in MeCN gave rise to [PPh4][(,5 -C5Me5)WS3 (CuBr)(Cul)2 -(,-dppm)] (1) in high yield. Compound 1 crystallizes in the monoclinic, space group P21/n with lattice parameters: a = 1.2906(4) nm, b = 1.5006(8) nm, c = 3.1484(6) nm, , = 92.12(2)°, V = 6.093(3) nm3, Z = 4. The structure of the anion of 1 contains an incomplete WS3Cu3 cubane-like core in which two Cul units are bridged by a dppm ligand. The W-Cu distances vary in the range of 0.2644(1),0.2793(1) nm. The optical limiting (OL) properties of 1 in MeCN were measured with the laser pulse-width of 12-ns at 532 nm, and the nanosecond OL effect may be due to the reverse saturable absorption (RSA) related to the excited triplet states. [source] | ||||||||||