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Two-Photon Absorption and Optical Power Limiting Based on New Organic Dyes

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Chinese Physics Letters 2001年第8期18卷 1120-1122页

作者： ZHOU Guang-Yong WANG Chun LEI Hong WANG Dong SHAO Zong-Shu jiang min-hua State Key Laboratory of Crystal Materials Shandong UniversityJi’nan 250100 State Key Laboratory of Ultrafast Laser Spectroscopy Zhongshan UniversityGuangzhou 510275 Department of Electronic Engineering Shandong UniversityJi’nan 250100

Two new organic dye samples J and L with a large two-photon absorption(TPA)cross section have been *** linear absorption spectra show that there is no linear absorption at the wavelength from 650 to 1200 *** molecular TPA cross section was measured to be as high as 2.59 × 10^(-47)cm^(4)·s and 2.98 × 10^(-47)cm^(4)·s at 1064 nm for samples J and L,*** input-output curves indicate that there is a clear optical power limiting behaviour when the input intensity is higher than 0.4 GW/cm^(2).Furthermore,basic theorety of TPA process has been discussed.

关键词： absorption limiting behaviour

Crystal Structure and Characterization of a Dye with Two-photon Pumped Frequency-upconverted Lasing Properties

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Chemical Research in Chinese Universities 2002年第2期18卷 211-215页

作者： TIAN Yu-peng YU Wen-tao FANG Qi WU Jie-ying jiang min-hua WANG He-zhou ZHENG Xi-guang Department of Chemistry Anhui UniversityHefei 230039P.R.China State Key Laboratory of Coordination Chemistry Nanjing UniversityNanjing 210093P.R.China Institute of Crystal Materials State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100P.R.China Institute for Laser and Spectroscopy Zhongshan UniversityGuangzhou 510275P.R.China

The title compound, trans 4 [p (N ethyl N (hydroxyethyl)amino) styryl] N methylpyridinium tetraphenylborate(abbreviated as ESMT, C 46 H 49 N 4OB) crystallizes in a space group P 1 with a =0 983 23(15) nm, b =1 410 73(16) nm, c =1 54 21(12) nm, α=95 252(13)°, β= 91 959(17)°, γ= 107 421(12)°, Z=2, F(000)=712, μ =0 1 mm -1 Mo Kα radiation, R =0 093 8. The result shows that the cation of the molecule almost lies in one plane, the hydroxyethyl group is perpendicular to the plane, the anion takes a slight distorted tetrahedral geometry. Also the thermal stability, two photon fluorescence, two photon pumped lasing property for the title compound were studied.

关键词： Crystal structure Methylpyridinium salt Two photon pumped lasing property

Mutually Pumped Phase-Conjugate Mirror:Two Arches Configuration

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Chinese Physics Letters 1997年第1期14卷 36-39页

作者： ZHANG Liang-min SHAO Zong-shu ZHANG Jing-wen CHEN Jun MU Xiao-dong CHEN huan-chu jiang min-hua National Laboratory of Crystal Materials Shandong UniversityJihan 250100

A mutually pumped phase conjugator with a novel photorefractive crystal of copper-doped potassium sodium strontium barium niobate is reported,in which both incoherent beams are incident upon the negative c face and they travel in geometric paths similar to the outline of two *** maximum reflectivity attains 21%.The tolerance of the output to both incident angles and positions is *** apparent cross talk is observed.A cross-readout mechanism is also used to explain phase-conjugate reflectivity *** is verified that the configuration can be realized easily for a crystal with two longer a sides.

关键词： pumped reflectivity Configuration

Growth,Defects and Non-critical Phase Matching of Nb Doped KTP Crystals

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Chinese Physics Letters 1996年第3期13卷 203-206页

作者： WEI Jing-qian WANG Ji-yang LIU Yao-gang WANG Chang-qing SHAO Zong-shu GUAN Qing-cai jiang min-hua Institute of Crystal Materials Shandong UniversityJi'nan 250100

A series of Nb doped KTP crystals are grown with seed Aux method and Hux pulling *** results of our investigation on growth,morphology defects of the crystals are reported in this *** obtained the relationship between Nb contents and second-harmonic generation angles of the *** phase matching has been realized by 4%Nb doped KTP crystal for Nd:YAG laser 1.06μm output.

关键词： Nd:YAG Crystal Matching

Two Photon Pumped Upconversion and Nonlinear Optical Properties of a New Lasing Dye: DEASPI

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Chinese Physics Letters 2001年第7期18卷 915-917页

作者： WANG Dong WANG Xiao-Mei ZHOU Guang-Yong WANG Chun SHAO Zong-Shu jiang min-hua State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJi’nan 250100

The two-ephoton pumped frequency upconversion optical properties and the two-photon absorption(TPA)induced nonlinear absorption of a new dye trans-4-[p-(N,N-diethylamino)styryl]-N-methylpyridinium iodide(abbreviated as DEASPI)have been experimentally *** new dye exhibits strong superradiation properties when the pumping power is above the ***,the superradiation upconversion efficiency and the nonlinear absorption at different wavelengths have been *** largest effective molecular TPA cross section was measured to be 3.9 × 10^(-47)cm^(4).s/photon at 930 *** 1064 nm,it was 3.85 × 10^(-48)cm^(4).s/photon,much smaller than that at 930 *** highest upconversion efficiency is 7.57%at 1020 nm,whereas 4.5%at 1064 nm.

关键词： pumped pumping absorption

Two-Photon-Absorption Induced Superradiance of a New Organic Dye PSPS

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Chinese Physics Letters 2002年第5期19卷 739-741页

作者： Zhao Xian jiang min-hua Shao Zong-Shu Xu Xin-Guang Zhou Guang-Yong Wang Xiao-Mei Yang Sheng-Jun Wang Dong State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University Ji\'nan 250100

The linear and nonlinear optical properties of a new two-photon absorption (TPA) dye, trans-4-(4\'-pyrrolidinyl styryl)-N-methyl pyridinium methylsulfate (abbreviated as PSPS) is reported. Intense red superradiance with a peak located at 625nm can be observed from PSPS solution in benzyl alcoholwhen pumped by a focused picosecond laser beam operated at 1064nm. The lifetimes of one-photon absorption (OPA) and TPA fluorescence were measuredto be 370 and 384ps, respectively. The pulse widths of OPA and TPA superradiance were 60 and 58 ps, respectively. The highest net upconversionefficiency from the absorbed pump laser to the upconverted superradiance is 8.3% at the pump energy of 0.6 mJ.

关键词： Two photon processes

Self-Frequency Doubling Laser Performance of Nd:GdCOB Crystal with a Phase-Matching Angle Out of the Principal Plane

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Chinese Physics Letters 1999年第9期16卷 651-652页

作者： LÜJun-hua LI Guang-ming LIU Jun-hai ZHANG Shu-jun CHEN huan-chu jiang min-hua SHAO Zong-shu National Key Laboratory of Crystal Materials Shandong UniversityJinan 250100

The self-frequency doubling laser performance of Nd:GdCOB crystal cut in phase-matching direction(θ=66.3°,Ф=134.4°)was compared with the crystal cut in the direction of(θ=90°,Ф=46°).Results show that the former has a higher second-harmonic conversion efficiency than the *** Ti:sapphire laser as pumping source,a maximum of 11.3mW of green light has been obtained with an incident power of *** corresponds to an optical-optical conversion efficiency of 2.2%.Laser threshold for self-frequency doubling operation is measured to be 1 *** our knowledge,this is the lowest threshold achieved so far.

关键词： Nd: pumping Crystal

Thermal Lensing Measurement and Laser Performance of End-Pumped Lightly Doped Nd:GdVO_(4) Crystal

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Chinese Physics Letters 1999年第11期16卷 814-815页

作者： LIU Jun-hai SHAO Zong-shu MENG Xian-lin ZHANG huai-jin ZHU Li jiang min-hua National Laboratory of Crystal Materials Shandong UniversityJinan 250100

The thermal lensing effect generated in an end-pumped lightly doped Nd:GdVO4 crystal was found to be considerably weaker than that in Nd:YVO4 having the same Nd3+ concentration. Consequently, the laser performance of Nd:GdVO4 at high pump powers over 20 W was found to be superior to that of Nd:YVO4. TEM00 mode cw radiation of 14.3 W at 1.06μm was achieved with an optical conversion efficiency of 55%, and average slope efficiency of 62%.

关键词： Nd:GdVO4 Nd:YVO4 Crystal

Effect of Solvents on the Absorption Properties of GaP Nanocrystals

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Chinese Physics Letters 1998年第4期15卷 307-309页

作者： CUI De-liang GAO Shan-min huaNG Bai-biao YU Shu-qin QIN Xiao-yan jiang min-hua National Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinan 250100

GaP nanocrystals were synthesized by both the organic solvent reflux and high temperature high pressure benzene thermal synthesis *** effect of organic solvent on the optical absorption properties of GaP nanocrystals were *** results show that crystal grains of the sample synthesized by the latter method have better quality and *** solvents which consist of polar molecules and form strong chemical bonds with Ga atoms cause obvious redshift of the absorption spectra of GaP *** absorption spectra redshift much more if the solvent molecules have π electrons which involved in the formation of complex bond between Ga atoms and solvent molecules.

关键词： methods absorption bonds