By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu...By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu3+ =Y2O3 and laser crystals Tb3+:=YAlO3 and Nd3+:YVO4, are investigated in detail. On the basis of three fitting Ω parameters and the effective reduced matrix elements, the spectral linestrengths, spontaneous emission probabilities, fluorescent branching ratios and lifetimeare calculated. The better agreement between theoretical results and experimental dataindicates the importance of J-mixing in the spectroscopic study of laser crystals.展开更多
A theoretical model of the self sum-frequency-mixing(SFM)laser generated by a single crystal is proposed,in which spatial distribution of the pump and circulating fundamental lasers with arbitrary beam waists are take...A theoretical model of the self sum-frequency-mixing(SFM)laser generated by a single crystal is proposed,in which spatial distribution of the pump and circulating fundamental lasers with arbitrary beam waists are taken into account.The model is then applied to two kinds of crystals of current interest,Nd:YAI_(3)(BO_(3))_(4) and Nd:Ca_(4)GdO(BO_(3))_(3).Numerical analyses of the self-SFM laser properties predict and confirm some experimental results.The model proposed is not limited to self-SFM lasers and may be applied to general analyses of the fundamental or nonlinear laser generation with Gaussian beams.展开更多
The laser performance of Neodymium-doped potassium gadolinium tungstate(Nd:KGd(WO4)2)crystal was studied by using Ti:Sapphire laser as the pump source.The maximum optical-to-optical efficiencies for the 1.067 and 1.3...The laser performance of Neodymium-doped potassium gadolinium tungstate(Nd:KGd(WO4)2)crystal was studied by using Ti:Sapphire laser as the pump source.The maximum optical-to-optical efficiencies for the 1.067 and 1.3μm laser outputs were measured to be 60%and 32.3%,respectively.The internal loss coefficient of the crystal for 1.067μm laser was estimated to be as low as 0.004 cm-1.The oscillation thresholds at 1.067 and 1.3μm for different output transmittances are also given.展开更多
基金Project(2021zzts0775) supported by the Independent Exploration and Innovation Project for Graduate Students of Central South University,ChinaProject(2021JJ30053) supported by the Hunan Natural Science Foundation,China。
文摘By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu3+ =Y2O3 and laser crystals Tb3+:=YAlO3 and Nd3+:YVO4, are investigated in detail. On the basis of three fitting Ω parameters and the effective reduced matrix elements, the spectral linestrengths, spontaneous emission probabilities, fluorescent branching ratios and lifetimeare calculated. The better agreement between theoretical results and experimental dataindicates the importance of J-mixing in the spectroscopic study of laser crystals.
基金Supported by Fujian Provincial Natural Science Foundation of China(No.A9910019)Fujian Provincial International Cooperation Foundation of China(No.99-1-7)Foundation of Chinese Academy of Sciences for Outstanding Returned Scholars.
文摘A theoretical model of the self sum-frequency-mixing(SFM)laser generated by a single crystal is proposed,in which spatial distribution of the pump and circulating fundamental lasers with arbitrary beam waists are taken into account.The model is then applied to two kinds of crystals of current interest,Nd:YAI_(3)(BO_(3))_(4) and Nd:Ca_(4)GdO(BO_(3))_(3).Numerical analyses of the self-SFM laser properties predict and confirm some experimental results.The model proposed is not limited to self-SFM lasers and may be applied to general analyses of the fundamental or nonlinear laser generation with Gaussian beams.
基金Supported by the National Natural Science Foundation of China under Grant No.59772004.
文摘The laser performance of Neodymium-doped potassium gadolinium tungstate(Nd:KGd(WO4)2)crystal was studied by using Ti:Sapphire laser as the pump source.The maximum optical-to-optical efficiencies for the 1.067 and 1.3μm laser outputs were measured to be 60%and 32.3%,respectively.The internal loss coefficient of the crystal for 1.067μm laser was estimated to be as low as 0.004 cm-1.The oscillation thresholds at 1.067 and 1.3μm for different output transmittances are also given.
基金This project was supported by the grants from National Natural Science Foundation of China （No. 30971323）, Shanghai Science and Technology projects （No. 08411961000, No. 0852nm05600, No. 09411951500） and Shanghai Excellent Academic Leaders Plan （No. 08XD1403400）.
