Continuous-wave radiation of 5W at 532 nm was produced with an Nd:YVO_(4)/KTP intracavity&equency-doubled laser end-pumped by a diode-laser-array at pump power of 17.2 W,giving optical conversion efRciency of 29.1...Continuous-wave radiation of 5W at 532 nm was produced with an Nd:YVO_(4)/KTP intracavity&equency-doubled laser end-pumped by a diode-laser-array at pump power of 17.2 W,giving optical conversion efRciency of 29.1%.The output power stability was measured to be better than 1.5%in short term operation.The pump-induced thermal lensing was also measured,showing good agreement with the performance of the laser.展开更多
The nonlinear-optical coefficients of RCOB(R=Gd,Y)crystals are measured.The spatial distribution of deff effective nonlinear-optical coefficient is determined subsequently.Our experiments show that the maximum deff oc...The nonlinear-optical coefficients of RCOB(R=Gd,Y)crystals are measured.The spatial distribution of deff effective nonlinear-optical coefficient is determined subsequently.Our experiments show that the maximum deff occurs at the second quadrant.The second-harmonic-generation efficiency reaches 48%for a 6 mm-long,(113.2°,47.4°)-cut GdCOB,and 41.5%for a 5mm-long,(113°,36.5°)-cut YCOB,respectively.The intracavity frequency doubling of GdCOB is reported for the first time.展开更多
A special prism coupling technique with the KBe_(2)BO_(3)F_(2) crystal is adopted to produce deep ultraviolet light including the fourth harmonic from an Nd:YAG laser,for which a conversion efficiency as high as 10%ha...A special prism coupling technique with the KBe_(2)BO_(3)F_(2) crystal is adopted to produce deep ultraviolet light including the fourth harmonic from an Nd:YAG laser,for which a conversion efficiency as high as 10%has been obtained.展开更多
The diffusion behaviour of 1.0 and 2.0MeV Au^(+)implanted into LiB_(3)O_(5)single crystal has been studied by the Rutherford backscattering of 2.1 MeV He ions.Annealing was performed at temperatures of 600,700,and 800...The diffusion behaviour of 1.0 and 2.0MeV Au^(+)implanted into LiB_(3)O_(5)single crystal has been studied by the Rutherford backscattering of 2.1 MeV He ions.Annealing was performed at temperatures of 600,700,and 800℃each for 30 min.The results show that the diffusion behaviour is quite different in two cases.In LiB_(3)O_(5),the depth distribution of the 1.0MeV Au is nearly Gaussian and becomes bimodal after annealing at 800℃for 30 min.But in the case of 2.0 MeV,the depth distribution of as implanted Au^(+)in LiB_(3)O_(5)has splitting behaviour.After 800℃for 30 min annealing,there is no obvious diffusion observed.The precise interpretation is needed.展开更多
Second harmonic generation conversion efficiencies of Nd:YCOB and Nd:GdCOB were measured,the effective nonlinear coefficient(de_(ff))for both crystals at different phase-matching angles were estimated by comparison wi...Second harmonic generation conversion efficiencies of Nd:YCOB and Nd:GdCOB were measured,the effective nonlinear coefficient(de_(ff))for both crystals at different phase-matching angles were estimated by comparison with a KTP crystal.The self-frequency doubling laser performance c£these crystals were theoretically calculated by using these rfeff values and slope efficiency of the fundamental wave and lasing threshold.The results coincide very well.展开更多
RbTiOAsO_(4)(RTA)crystals of high optical quality were grown with flux method.The defects of RTA crystals are mainly growth striations,growth sector boundaries and sometimes ferroelectric domains.The refractive indice...RbTiOAsO_(4)(RTA)crystals of high optical quality were grown with flux method.The defects of RTA crystals are mainly growth striations,growth sector boundaries and sometimes ferroelectric domains.The refractive indices and electrooptic coefficients were measured together with dielectric constants,ionic conductivity and direct current resistivities.It is shown that RbTiOAsO_(4) is not only as good a nonlinear optical crystal as KTiOPO4 but also a superior electrooptic crystal.展开更多
A series of Nb doped KTP crystals are grown with seed Aux method and Hux pulling method.The results of our investigation on growth,morphology defects of the crystals are reported in this paper.We obtained the relation...A series of Nb doped KTP crystals are grown with seed Aux method and Hux pulling method.The results of our investigation on growth,morphology defects of the crystals are reported in this paper.We obtained the relationship between Nb contents and second-harmonic generation angles of the crystals.Noncritical phase matching has been realized by 4%Nb doped KTP crystal for Nd:YAG laser 1.06μm output.展开更多
基金Supported by the National Advanced Materials Commit tee of the"863 Program"under Grant No.863-715-001-0030.
文摘Continuous-wave radiation of 5W at 532 nm was produced with an Nd:YVO_(4)/KTP intracavity&equency-doubled laser end-pumped by a diode-laser-array at pump power of 17.2 W,giving optical conversion efRciency of 29.1%.The output power stability was measured to be better than 1.5%in short term operation.The pump-induced thermal lensing was also measured,showing good agreement with the performance of the laser.
基金Supported by the Key Program of the National Natural Science Foundation of China under Grant No.69890235the Key Program of Science and Technology Research of the Minis try of Education of China under Grant No.99182.
文摘The nonlinear-optical coefficients of RCOB(R=Gd,Y)crystals are measured.The spatial distribution of deff effective nonlinear-optical coefficient is determined subsequently.Our experiments show that the maximum deff occurs at the second quadrant.The second-harmonic-generation efficiency reaches 48%for a 6 mm-long,(113.2°,47.4°)-cut GdCOB,and 41.5%for a 5mm-long,(113°,36.5°)-cut YCOB,respectively.The intracavity frequency doubling of GdCOB is reported for the first time.
文摘A special prism coupling technique with the KBe_(2)BO_(3)F_(2) crystal is adopted to produce deep ultraviolet light including the fourth harmonic from an Nd:YAG laser,for which a conversion efficiency as high as 10%has been obtained.
基金Supported by the National Natural Science Foundation of China under Grant No.19775031,the Hong Kong University of Science and Technology Research Infracture Grant R191/92SC05Laboratory of Heavy Ion Physics,Peking University。
文摘The diffusion behaviour of 1.0 and 2.0MeV Au^(+)implanted into LiB_(3)O_(5)single crystal has been studied by the Rutherford backscattering of 2.1 MeV He ions.Annealing was performed at temperatures of 600,700,and 800℃each for 30 min.The results show that the diffusion behaviour is quite different in two cases.In LiB_(3)O_(5),the depth distribution of the 1.0MeV Au is nearly Gaussian and becomes bimodal after annealing at 800℃for 30 min.But in the case of 2.0 MeV,the depth distribution of as implanted Au^(+)in LiB_(3)O_(5)has splitting behaviour.After 800℃for 30 min annealing,there is no obvious diffusion observed.The precise interpretation is needed.
基金Supported by the National Natural Science Foundation of China under Grant No.68890235.
文摘Second harmonic generation conversion efficiencies of Nd:YCOB and Nd:GdCOB were measured,the effective nonlinear coefficient(de_(ff))for both crystals at different phase-matching angles were estimated by comparison with a KTP crystal.The self-frequency doubling laser performance c£these crystals were theoretically calculated by using these rfeff values and slope efficiency of the fundamental wave and lasing threshold.The results coincide very well.
基金the National 863 High Technology Program of China。
文摘RbTiOAsO_(4)(RTA)crystals of high optical quality were grown with flux method.The defects of RTA crystals are mainly growth striations,growth sector boundaries and sometimes ferroelectric domains.The refractive indices and electrooptic coefficients were measured together with dielectric constants,ionic conductivity and direct current resistivities.It is shown that RbTiOAsO_(4) is not only as good a nonlinear optical crystal as KTiOPO4 but also a superior electrooptic crystal.
基金Supported by a grant for Research Project in Climbing Program from the Science and Technology Commission of China.
文摘A series of Nb doped KTP crystals are grown with seed Aux method and Hux pulling method.The results of our investigation on growth,morphology defects of the crystals are reported in this paper.We obtained the relationship between Nb contents and second-harmonic generation angles of the crystals.Noncritical phase matching has been realized by 4%Nb doped KTP crystal for Nd:YAG laser 1.06μm output.
