Tri-allylthiourea mercury chloride(ATMC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.The SHG effect of ATMC is three times as large as that of urea cry...Tri-allylthiourea mercury chloride(ATMC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.The SHG effect of ATMC is three times as large as that of urea crystal.Transparent single crystal of 15×15×10mm^(3) has been grown.Comprehensive studies of crystal growth,structure,and general properties have been carried out.The results show that organometallic complexes are promising nonlinear optical materials for wide applications.展开更多
Lattice matched GaInP/GaAs heterostructures were grown by atmospheric pressuremetal organic vapor phase epitaxy(AP-MOVPE).Compositional intermixing of As/P and Ga/In near the heterointerfaces was studied by photolumin...Lattice matched GaInP/GaAs heterostructures were grown by atmospheric pressuremetal organic vapor phase epitaxy(AP-MOVPE).Compositional intermixing of As/P and Ga/In near the heterointerfaces was studied by photoluminescence(PL)spectroscopy.Indium segregation,memory effect of In into GaAs and the carry-over of As in the GaInP layer during the growth process were considered as three major factors giving rise to the anomalous emissions in the PL spectra.Both thermal annealing and zinc doping strongly enhanced the compositional interdiffusion near the heterointerfaces.展开更多
In this paper,by comparing the three possible combinations of the basic structure unit TiO_(6) octahedra,a simple model is proposed to explain the cause of the formation of the bicrystal structure in KTiOPO_(4)(KTP)cr...In this paper,by comparing the three possible combinations of the basic structure unit TiO_(6) octahedra,a simple model is proposed to explain the cause of the formation of the bicrystal structure in KTiOPO_(4)(KTP)crystals.The theoretical morphology of KTP crystal is studied and the rate of the appearance possibilities of different faces are obtained.The relationships between bicrystal structure and crystal properties are discussed.展开更多
We have grown two structures of AlAs/GaAs/AlAs double barrier resonant tunneling diodes by metal-organic chemical vapor deposition.The resonances to the first excited states were obtained,the measured peak-to-valley c...We have grown two structures of AlAs/GaAs/AlAs double barrier resonant tunneling diodes by metal-organic chemical vapor deposition.The resonances to the first excited states were obtained,the measured peak-to-valley current ratio is 1.3 at 77 K,room temperature peak current is 8kA/cm^(2),the resonance voltages are in agreement with the theoretical approach by transfer-matrix method.展开更多
A prospective new organic material:3-methoxy-4-hydroxy-benzaldehyde(MHBA)with powder second harmonic generation efficiency 30 times as large as that of urea and the cutoff wavelength of 370nm is reported.MHBA belongs ...A prospective new organic material:3-methoxy-4-hydroxy-benzaldehyde(MHBA)with powder second harmonic generation efficiency 30 times as large as that of urea and the cutoff wavelength of 370nm is reported.MHBA belongs to monoclinic system space group P2_(1),and the unit cell parameters are:a=14.057Å,b=7.875Å,c=15.037Åandβ=115.45°,the general physicalchemical properties are also presented.展开更多
Tri-allyIthiourea cadmium chloride(ATCC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.Transparani single crystal of 30×30×25mm has been grown....Tri-allyIthiourea cadmium chloride(ATCC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.Transparani single crystal of 30×30×25mm has been grown.Com-prehensive studies of crystal growth,structure and general properties have been carried out.The results show that organometallic complexes are promising nonlinear optical materials for wide applications.展开更多
Using dye laser as pumping light source,we have first realized on NYAB crystal the laser self-frequency doubling run from 1.06μm to 0.53μm.The threshold energy is less than 4mJ;conversion efficiency is 6.2%,and the ...Using dye laser as pumping light source,we have first realized on NYAB crystal the laser self-frequency doubling run from 1.06μm to 0.53μm.The threshold energy is less than 4mJ;conversion efficiency is 6.2%,and the self-frequency-doubling green light output energy is 2.5mJ.展开更多
This paper presents metalorganic chemical vapor deposition(MOCVD)growth of GaAs/Al_(x)Ga_(1-x)As superlattices in our laboratory.Superlattice structures are characterized by using cros&-sectional transmission elec...This paper presents metalorganic chemical vapor deposition(MOCVD)growth of GaAs/Al_(x)Ga_(1-x)As superlattices in our laboratory.Superlattice structures are characterized by using cros&-sectional transmission electron microscopy,and the results show that they are in agreement with designed parameters.The superlattice used as buffer layer can smooth out interface tiuctuations.The high mobility of Ga-containing species and the anisotropic growth rate of GaAs on different facets lead to the planarization of the wavy interface;whereas the low mobility of Al-containing species tends to preserve the surface shape.展开更多
In China, a number of power plants are installed with large imported FGD equipment. As from 1990s, China has built several demonstration projects with wet limestone-gypsum, simplified wet limestonegypsum, spray semi-d...In China, a number of power plants are installed with large imported FGD equipment. As from 1990s, China has built several demonstration projects with wet limestone-gypsum, simplified wet limestonegypsum, spray semi-drying, seawater, LIFAC and EBA processes along with vigorous introduction of foreign FGD equipment and technologies. As seen by FGD projects being under invitation for bid, large-sized units will generally be fitted with limestone-gypsum FGD equipment. Although theefficiency of FGD equipment is being raised rapidly, especially that of limestone/gypsum FGD equipment can reach 90%, such a technology has much room for improvement. In the coming ten years, China should exert itself to institute design and construction specification and standards, improve operation and maintenance techniques and develop new materials, etc.展开更多
基金Projects supported by the National Science Fundation of China(918700100).
文摘Tri-allylthiourea mercury chloride(ATMC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.The SHG effect of ATMC is three times as large as that of urea crystal.Transparent single crystal of 15×15×10mm^(3) has been grown.Comprehensive studies of crystal growth,structure,and general properties have been carried out.The results show that organometallic complexes are promising nonlinear optical materials for wide applications.
文摘Lattice matched GaInP/GaAs heterostructures were grown by atmospheric pressuremetal organic vapor phase epitaxy(AP-MOVPE).Compositional intermixing of As/P and Ga/In near the heterointerfaces was studied by photoluminescence(PL)spectroscopy.Indium segregation,memory effect of In into GaAs and the carry-over of As in the GaInP layer during the growth process were considered as three major factors giving rise to the anomalous emissions in the PL spectra.Both thermal annealing and zinc doping strongly enhanced the compositional interdiffusion near the heterointerfaces.
基金Supported by a grant for Key Research Projection Climbing Program from the State Science and Technology Commission of China。
文摘In this paper,by comparing the three possible combinations of the basic structure unit TiO_(6) octahedra,a simple model is proposed to explain the cause of the formation of the bicrystal structure in KTiOPO_(4)(KTP)crystals.The theoretical morphology of KTP crystal is studied and the rate of the appearance possibilities of different faces are obtained.The relationships between bicrystal structure and crystal properties are discussed.
基金Supported by the National Natural Science Foundation of China.
文摘We have grown two structures of AlAs/GaAs/AlAs double barrier resonant tunneling diodes by metal-organic chemical vapor deposition.The resonances to the first excited states were obtained,the measured peak-to-valley current ratio is 1.3 at 77 K,room temperature peak current is 8kA/cm^(2),the resonance voltages are in agreement with the theoretical approach by transfer-matrix method.
基金Supported by the National Natural Science Foundation(918700100).
文摘A prospective new organic material:3-methoxy-4-hydroxy-benzaldehyde(MHBA)with powder second harmonic generation efficiency 30 times as large as that of urea and the cutoff wavelength of 370nm is reported.MHBA belongs to monoclinic system space group P2_(1),and the unit cell parameters are:a=14.057Å,b=7.875Å,c=15.037Åandβ=115.45°,the general physicalchemical properties are also presented.
文摘Tri-allyIthiourea cadmium chloride(ATCC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)effect.Transparani single crystal of 30×30×25mm has been grown.Com-prehensive studies of crystal growth,structure and general properties have been carried out.The results show that organometallic complexes are promising nonlinear optical materials for wide applications.
文摘Using dye laser as pumping light source,we have first realized on NYAB crystal the laser self-frequency doubling run from 1.06μm to 0.53μm.The threshold energy is less than 4mJ;conversion efficiency is 6.2%,and the self-frequency-doubling green light output energy is 2.5mJ.
基金Supported by the National Natrual Science Foundation of China.
文摘This paper presents metalorganic chemical vapor deposition(MOCVD)growth of GaAs/Al_(x)Ga_(1-x)As superlattices in our laboratory.Superlattice structures are characterized by using cros&-sectional transmission electron microscopy,and the results show that they are in agreement with designed parameters.The superlattice used as buffer layer can smooth out interface tiuctuations.The high mobility of Ga-containing species and the anisotropic growth rate of GaAs on different facets lead to the planarization of the wavy interface;whereas the low mobility of Al-containing species tends to preserve the surface shape.
文摘In China, a number of power plants are installed with large imported FGD equipment. As from 1990s, China has built several demonstration projects with wet limestone-gypsum, simplified wet limestonegypsum, spray semi-drying, seawater, LIFAC and EBA processes along with vigorous introduction of foreign FGD equipment and technologies. As seen by FGD projects being under invitation for bid, large-sized units will generally be fitted with limestone-gypsum FGD equipment. Although theefficiency of FGD equipment is being raised rapidly, especially that of limestone/gypsum FGD equipment can reach 90%, such a technology has much room for improvement. In the coming ten years, China should exert itself to institute design and construction specification and standards, improve operation and maintenance techniques and develop new materials, etc.
