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Chinese Physics Letters 1996年第10期13卷 741-743页

作者： MU Xiao-dong shao zong-shu ZHANG Heng-li KONG Qing-yu JIANG Min-hua National Laboratory of Crystal Materials Shandong UniversityJinan 250100

Using the Cerenkov second harmonic generation, 478 nm blue and 402nm violet light are generated by direct frequency doubling of 956 and 804 nm diode lasers in a same proton exchanged MgO:LiNbO3 waveguide. Under the low fundamental guide wave power of less than 1mW, the estimated value of the output blue and violet light power is in the order of 0.1-0.01μW.

关键词： Waveguide violet doubling

Mutually Pumped Phase-Conjugate Mirror: Sickle Configuration

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Chinese Physics Letters 1996年第9期13卷 678-681页

作者： ZHANG Liang-min ZHANG Jing-wen shao zong-shu MU Xiao-dong CHEN Huan-chu JIANG Min-hua National Laboratory of Crystal Materials Shandong UniversityJinan 250100

A mutually pumped phase conjugator is demonstrated with a novel photorefractive crystal of copper-doped potassium sodium strontium barium niobate,in which the beams travel in a geometric path similar to the outline of a *** maximum reflectivity is up to 168%.Faster response times are measured and are also simulated as a function of incident beam power *** available input geometries are *** phase conjugation signals exist wide range of angular and positional *** apparent cross talk is *** faster build-up process of phase conjugation beams is tentatively explained.

关键词： pumped Configuration mutually

Two-Photon Absorption-Induced Emission Properties of Dye HMASPS Doped Polymer

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Chinese Physics Letters 2002年第2期19卷 208-210页

作者： Ren Yan Jiang Min-Hua Yang Sheng-Jun Zhou Guang-Yong Xu Xin-Guang Wang Dong shao zong-shu State Key Laboratory of Crystal Materials Shandong University Ji\'nan 250100

The 0.01M two-photon absorption dye trans-4-[p-(N-hydroxyethyl-N-methylamino)styryl]-N-methyl-pyridinium p-toluene sulfonate (HMASPS) doped polymer has been prepared. Whenpumped by the picosecond pulse from the pulsed mode-locked Nd:YAG laser, the polymer emits more intense upconverted fluorescence andsuperradiance compared to the solution sample of the dye. The two-photon pumped lasing with oscillating pulses has also beenobtained. Compared to the dye in its solution state, the emission spectra of the polymer are all blueshifted. The polymer has a longupconverted fluorescent lifetime of about4.041±0.04ns

关键词： Photons

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

Thermal Lens Determination of End-Pumped Solid-state Lasers by a Simple Direct Approach

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Chinese Physics Letters 1999年第3期16卷 181-183页

作者： LIU Jun-hai LU Jian-ren LÜJun-hua shao zong-shu JIANG Min-hua National Laboratory of Crystal Materials Shandong UniversityJi’nan 250100

The stability of linear planar resonators involved in solid-state lasers is entirely decided by the thermal lens of the laser *** exists a critical point between stable state and unstable state at which the thermal focal length equals the distance from the center of the crystal to one end *** on this fact,a new method for measuring the thermal focal length of the laser crystal has been presented and applied to a Nd^(3+):YVO_(4) crystal at various absorbed pump power levels up to 10 *** results have shown to be in good agreement with theoretical calculation.

关键词： pump state crystal

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

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

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