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Effect of Pressure on Thermal Stability and Decomposition of kdp Crystal

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Chinese Physics Letters 2011年第2期28卷 176-178页

作者： DING Jian-Xu WANG Tao WANG Sheng-Lai CUI De-Liang MU Xiao-Ming XU Xin-Guang State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100 Yantai Department No.52 Institute of North Industries GroupYantai 264003

Effect of pressure on thermal behavior of kdp crystals is investigated by using the in-situ infrared reflective *** with that under normal atmosphere,the onset temperature of decomposition under pressure of 1 MPa is improved to from 210℃to 213℃,suggesting that the thermal stability of kdp is *** pressure of 2 MPa,the thermal stability is deteriorated and kdp begins to decompose at 183℃.Under normal atmosphere kdp decomposes in route of translating to K_(4)P_(2)O_(7)firstly,and then to KPO_(3).Under pressures of 1 MPa and 2MPa,kdp translates to KPO_(3)directly without any other polymeric intermediates.

关键词： spectra kdp decompose

Wavelength Dependence of Laser-Induced Bulk Damage Morphology in kdp Crystal:Determination of the Damage Formation Mechanism

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Chinese Physics Letters 2012年第3期29卷 216-219页

作者： HU Guo-Hang ZHAO Yuan-An LI Da-Wei XIAO Qi-Ling Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

Wet etch process is applied to expose the bulk damage sites in kdp crystals to the surface for the examination by scanning electron microscopy(SEM)and optical *** damage sites induced by 1064 nm laser consist of three distinct regions:a core,an outer region of modified material,and some oriented *** irradiated with 355 nm results in an increase of damage density,a decrease of core diameter and,rarely,occurrence of the *** Laboratory of Materials for High Power Laser,Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences,Shanghai 201800th dependence of the damage feature suggests that a repulsive force exists among the adjacent plasmas,which prevents further expansion of plasma and decreases the size of *** deposited energy absorbed by the smaller plasma may not be able to generate the crack.

关键词： Crystal damage kdp

Thermo-optic characterization of kdp single crystals by a modified Snarmont setup for electro-optic modulation system

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Chinese Optics Letters 2009年第7期7卷 632-639页

作者： H. L. Saadon M. A. Rahma Ali F. Marhoon N. Thofanous M. Aillerie Department of Informatics and Telecommunications Optoelectronics Group University of AthensPanepistimiopolis Ilisia GR-157 84 Athens Greece Department of Physics College of Science University of BasrahBasrah Iraq Laboratoire Matriaux Optiques Photonique et Systmes UMR CNRS 7132 Universit de Metz et Suplec2 rue E. Belin 57070 Metz France

For our kdp crystal orientation, various tbermo-optic （TO） and relevant temperature-dependence param- eters are defined, presented, and studied in the framework of a transverse and a longitudinal electro-optic （EO） modulation systems. This study is based on the concept of the so-called opto-electrical bias （~） ap- plied to the system. For both of the above EO-modulation systems, a set of original equations is extracted and investigated with regard to each of the more important TO or temperature coefficients. Using these equations, for these parameters the role of the transverse configuration is examined in comparison with its corresponding longitudinal configuration. A comparison is done with other orientation of the same kdp crystal.

关键词： narmont setup for electro-optic modulation system Thermo-optic characterization of kdp single crystals by a modified S kdp

Heterogeneous growth of kdp/KT crystal

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Chinese Physics B 2017年第10期26卷 262-264页

作者：王超施巍张壮壮曹惠车仁超 Laboratory of Advanced Materials Department of Materials ScienceCollaborative Innovation Center of Chemistry for Energy Materials Fudan University

The growth of heterogeneous crystal has aroused a great deal of interest in recent years. In this study, KH2PO4 （kdp）/KTaO3 （KT） heterogeneous crystal is acquired based on the KT substrate. Here, we report the observation of the oriented layer-by-layer structure in kdp/KT composite crystal by scanning electron microscopy （SEM）. The structure of kdp/KT composite crystal is accurately identified by transmission electron microscopy （TEM） for the first time and we find that the KT crystals dope into kdp crystal in the growth process with the mode of doping. It can be obtained from the analysis of crystal structure that the structure difference leads to the doping growth mode. Our research demonstrates a facile method to fabricate a composite nonlinear optical crystal based on kdp/KT heterostructure, and might shed light on potential applications of the composite nonlinear optical crystal.

关键词： kdp KT heterostructure nonlinear optical materials

Characteristics of Laser-Induced Surface Damage on Large-Aperture kdp Crystals at 351 nm

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Chinese Physics Letters 2015年第2期32卷 139-142页

作者：田野韩伟曹华保李富全冯斌赵军普郑奎兴朱启华郑万国 Research Center of Laser Fusion China Academy of Engineering Physics Graduate School of China Academy of Engineering Physics

Laser-induced damage often determines the effective lifetime of an optic in large high-energy laser facilities. We present the damage performance on the rear surface of a large-aperture kdp crystal for 351 nm, 5ns laser pulses. Surface damage shows a lower threshold than bulk damage after conditioning. Craters initiated on the scratch are found to increase with the shot number before filling the scratch. The experimental results reveal that damage initiation is mainly caused by extrinsic nanoabsorbers buried in the surface during the large-aperture laser operation.

关键词： In kdp

Rapid growth of a large-scale(600 mm aperture) kdp crystal and its optical quality

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High Power Laser Science and Engineering 2014年第1期2卷 40-44页

作者： Guohui Li Guozong Zheng Yingkun Qi Peixiu Yin En Tang Fei Li Jing Xu Taiming Lei Xiuqin Lin Min Zhang Junye Lu Jinbo Ma Youping He Yuangen Yao Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Potassium dihydrogen phosphate(kdp) single crystals are the only nonlinear crystals currently used for electro-optic switches and frequency converters in inertial confinement fusion research, due to their large dimension and exclusive physical properties. Based on the traditional solution-growth process, large bulk kdp crystals, usually with sizes up to600 × 600 mm2 so as to make a frequency doubler for the facility requirement loading highly flux of power laser, can be grown in standard Holden-type crystallizers, without spontaneous nucleation and visible defects, one to two orders of magnitude faster than by conventional methods. Pure water and kdp raw material with a few ion impurities such as Fe,Cr, and Al(less than 0.1 ppm) were used. The rapid-growth method includes extreme conditions such as temperature range from 60 to 35℃ , overcooling up to 5℃ , growth rates exceeding 10 mm/day, and crystal size up to 600 mm. The optical parameters of kdp crystals were determined. The optical properties of crystals determined indicate that they are of favorable quality for application in the facility.

关键词： large-scale kdp crystals rapid growth optical quality

Raman gains of ADP and kdp crystals

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Chinese Physics B 2015年第4期24卷 227-230页

作者：周海亮张清华王波许心光王正平孙洵张芳张立松刘宝安柴向旭 State Key Laboratory of Crystal Materials Shandong University Key Laboratory of Functional Crystal Materials and Device (Shandong University) Ministry of Education College of Information Science and Engineering Shandong Agricultural University Chengdu Fine Optical Engineering Research Centre

In this paper, the Raman gain coefficients of ammonium dihydrogen phosphate （ADP） and potassium dihydrogen phosphate （kdp） crystals are measured. By using a pump source of a 30-ps, 532-nm laser, the gain coefficients of ADP and kdp are 1.22 cm/GW, and 0.91 cm/GW, respectively. While for a 20-ps, 355-nm pump laser, the gain coefficients of these two crystals are similar, which are 1.95 cm/GW for ADP and 1.86 for kdp. The present results indicate that for ultra-violet frequency conversion, the problem of stimulated Raman scattering for ADP crystal will not be more serious than that for kdp crystal. Considering other advantages such the larger nonlinear optical coefficient, higher laser damage threshold, and lower noncritical phase-matching temperature, it can be anticipated that ADP will be a powerful competitor to kdp in large aperture, high energy third-harmonic generation or fourth-harmonic generation applications.

关键词： ADP kdp stimulated Raman scattering gain coefficient

Ex situ and in situ AFM investigations on the growth of the (100) face of kdp with different pH values

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Science China(Technological Sciences) 2010年第6期53卷 1554-1561页

作者： CHENG Min,LI MingWei,GUO JinLi & CAO YaChao College of Power Engineering,Chongqing University,Chongqing 400030,China 1. College of Power Engineering Chongqing University Chongqing 400030 China

Through investigations on the growth of the (100) face of potassium dihydrogen phosphate (kdp) crystal by ex situ atomic force microscopy (AFM) with different pH values at different supersaturations at 40°C,it was found that the growth of crystal was controlled by step flow at lower supersaturations,and the morphologies of steps were different under different growth *** addition,at the higher supersaturations,2D nucleation mechanism controlled the *** the supersaturations were lower,the dislocation mechanism controlled the growth of crystal,and when σ≥0.05,2D nucleation mechanism played a dominant role in the growth of the (100) face for pH=4.2 and pH=***,for pH=5.0,the dislocation mechanism also dominated the growth of crystal when the supersaturations were lower,but when σ≥0.03,the crystal growth was controlled by 2D nucleation *** investigations on the step flow of the (100) face of kdp crystal by in situ AFM with different pH values at lower supersaturations at 25°C,the velocities of normal growth of the (100) face were estimated at different growth conditions by in situ *** was found that when the pH value was 5.0,the normal growth rate was the fastest at the same supersaturation compared to the other pH values and screw dislocation mechanism controlled the crystal *** addition,we found that with the reduction of the supersaturation of the solution,the density of steps also decreased,the width of steps became ***,a phenomenon which was the obvious anisotropic growth of steps in the step flow was observed by in situ AFM at σ=0.025 at pH=5.0.

关键词： pH value kdp AFM step flow

Optical Properties and Structural Perfection of Chicago Sky Blue 6B-doped kdp Crystals

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Chinese Journal of Structural Chemistry 2010年第1期29卷 121-125页

作者：牟晓明王圣来许心光程秀凤孙绍涛丁建旭 State Key Laboratory of Crystal Materials Shandong University

kdp crystals doped with Chicago Sky Blue 6B（CSB-6B） were grown by traditional lowering temperature *** optical properties and structural perfection of kdp crystals were investigated by transmittance spectra and high-resolution X-ray diffraction,*** results indicate that CSB-6B tends to be incorporated into the pyramidal sector of kdp crystals（PyS-kdp） and lead to inclusions parallel to（101） ***,the transmittance of as-grown kdp crystals decreases as the amount of CSB-6B increases. Moreover,the rocking curves of PyS-kdp suggest that CSB-6B can deteriorate the structural perfection of PyS-kdp.

关键词： crystal growth defects optical materials and properties kdp structure perfection