Many physical properties on the sintered multicrystal materials have been measured,but they did not provide enough data for theorists to understand the superconducting mechanism,because some special properties can onl...Many physical properties on the sintered multicrystal materials have been measured,but they did not provide enough data for theorists to understand the superconducting mechanism,because some special properties can only be measured on tbe single crystals of large size and perfect quality.Several papers have reported the growth of superco ducting single crystals in Bi-Sr-CarCu-O system^(1-3),but the crystal size is small and the crystai quality is imperfect.Up to now,no published papers have reported the systematic investigation of the effects of growth conditions on the crystal size and quality.In tbis paper we report a systematic investigation of the effects of the grwoth conditions on the crystai size in Bi-Sr-Ca-Cu-O system.展开更多
Recently optical amplifiers with a gain factor of 4000 have been cons true ted using photorefractive BaTiO_(3) crystal and CW At+laser^(1,2).In this letter we report for the first time that a high-gain coherent CW ima...Recently optical amplifiers with a gain factor of 4000 have been cons true ted using photorefractive BaTiO_(3) crystal and CW At+laser^(1,2).In this letter we report for the first time that a high-gain coherent CW image amplifier was constructed by using two-wave coupling in a BaTiO_(3) crystal,and a gain factor of 21400 has been achieved successfully.展开更多
文摘Many physical properties on the sintered multicrystal materials have been measured,but they did not provide enough data for theorists to understand the superconducting mechanism,because some special properties can only be measured on tbe single crystals of large size and perfect quality.Several papers have reported the growth of superco ducting single crystals in Bi-Sr-CarCu-O system^(1-3),but the crystal size is small and the crystai quality is imperfect.Up to now,no published papers have reported the systematic investigation of the effects of growth conditions on the crystal size and quality.In tbis paper we report a systematic investigation of the effects of the grwoth conditions on the crystai size in Bi-Sr-Ca-Cu-O system.
基金supported by National Natural Science Foundation of China。
文摘Recently optical amplifiers with a gain factor of 4000 have been cons true ted using photorefractive BaTiO_(3) crystal and CW At+laser^(1,2).In this letter we report for the first time that a high-gain coherent CW image amplifier was constructed by using two-wave coupling in a BaTiO_(3) crystal,and a gain factor of 21400 has been achieved successfully.
