Pure and neodymium-doped gadolinium calcium oxoborate crystals of high quality were grown by the Czochralski method.The orientation of crystal was precisely determined,and the samples for measurements were prepared.Th...Pure and neodymium-doped gadolinium calcium oxoborate crystals of high quality were grown by the Czochralski method.The orientation of crystal was precisely determined,and the samples for measurements were prepared.Through synchrotron x-ray topography and high-resolution x-ray diffractometry,the twin structure was discovered.Some properties such as the figure of merit value,and dielectric,piezoelectric,and elastic constants were meausured along with a discussion of the anisotropy of the laser properties.展开更多
采用熔盐顶部籽晶法从K 2 Mo 3 O 10-B 2 O 3助熔剂中生长出尺寸为20 mm的优质GdAl 3(BO 3)4(简称GAB)和Nd^3+激活的自变频激光晶体。确定了GAB晶体的透光波长范围、折射率和倍频系数随波长的变化,结果表明其在整个透光范围内均可实现...采用熔盐顶部籽晶法从K 2 Mo 3 O 10-B 2 O 3助熔剂中生长出尺寸为20 mm的优质GdAl 3(BO 3)4(简称GAB)和Nd^3+激活的自变频激光晶体。确定了GAB晶体的透光波长范围、折射率和倍频系数随波长的变化,结果表明其在整个透光范围内均可实现相位匹配。测定了Nd^3+∶GAB晶体在室温下的偏振吸收、荧光光谱和荧光寿命,进行了光谱计算,测试了晶体的自变频激光性能,实现了紫外-可见光-红外-中红外多波段激光输出。展开更多
Considering that KBe2BO3F2(KBBF) is an outstanding deep ultraviolet crystal which can generate the shortest wavelengths in second harmonic generation and sum-frequency generation,we report the determination of the non...Considering that KBe2BO3F2(KBBF) is an outstanding deep ultraviolet crystal which can generate the shortest wavelengths in second harmonic generation and sum-frequency generation,we report the determination of the nonlinear optical coefficients of the KBBF crystal.The d11 coefficient was determined to be 0.49pm/V by the Maker fringes method at the wavelength 1064nm,which is in agreement well with the theoretical value.展开更多
YbxY1-xAl3(BO3)4(x=0.1,0.07 and 0)crystals have been grown by the flux method.The growth defects of YbxY1-xAl3(BO3)4 crystals were detected by X-ray topography.It is found that the perfcetion of YbYAB crystal with low...YbxY1-xAl3(BO3)4(x=0.1,0.07 and 0)crystals have been grown by the flux method.The growth defects of YbxY1-xAl3(BO3)4 crystals were detected by X-ray topography.It is found that the perfcetion of YbYAB crystal with low Yb dopant is better than that with high Yb dopant.In Yb0.1Y0.9Al3(BO3)4 crystal,growht bands,growth boundaries,grown-in dislocations and inclusions were observed.Howver,the densities of growth defects for Yb0.07Y0.93Al3(BO3)4 and YAl3(BO3)4 are low and no obvious inclusions are observed in these crytals.In addition,growth twins wrer detected in YbxY1-xAl3(BO3)4 crystal by using the chemical etching method.It is found that the growth twins occur frequently in Yb0.01Y0.9Al3(BO3)4 crystal whereas no growth twin appears in YAl3(BO3)4 crystal. Based on the experimental observations,the formation mechanism of growth twins is discussed.In the meantime,the effective measures for reducing the growth twins and defects are proposed.2001 Elsevier Science B.V.All rights reserved.展开更多
文摘Pure and neodymium-doped gadolinium calcium oxoborate crystals of high quality were grown by the Czochralski method.The orientation of crystal was precisely determined,and the samples for measurements were prepared.Through synchrotron x-ray topography and high-resolution x-ray diffractometry,the twin structure was discovered.Some properties such as the figure of merit value,and dielectric,piezoelectric,and elastic constants were meausured along with a discussion of the anisotropy of the laser properties.
文摘采用熔盐顶部籽晶法从K 2 Mo 3 O 10-B 2 O 3助熔剂中生长出尺寸为20 mm的优质GdAl 3(BO 3)4(简称GAB)和Nd^3+激活的自变频激光晶体。确定了GAB晶体的透光波长范围、折射率和倍频系数随波长的变化,结果表明其在整个透光范围内均可实现相位匹配。测定了Nd^3+∶GAB晶体在室温下的偏振吸收、荧光光谱和荧光寿命,进行了光谱计算,测试了晶体的自变频激光性能,实现了紫外-可见光-红外-中红外多波段激光输出。
文摘Considering that KBe2BO3F2(KBBF) is an outstanding deep ultraviolet crystal which can generate the shortest wavelengths in second harmonic generation and sum-frequency generation,we report the determination of the nonlinear optical coefficients of the KBBF crystal.The d11 coefficient was determined to be 0.49pm/V by the Maker fringes method at the wavelength 1064nm,which is in agreement well with the theoretical value.
文摘YbxY1-xAl3(BO3)4(x=0.1,0.07 and 0)crystals have been grown by the flux method.The growth defects of YbxY1-xAl3(BO3)4 crystals were detected by X-ray topography.It is found that the perfcetion of YbYAB crystal with low Yb dopant is better than that with high Yb dopant.In Yb0.1Y0.9Al3(BO3)4 crystal,growht bands,growth boundaries,grown-in dislocations and inclusions were observed.Howver,the densities of growth defects for Yb0.07Y0.93Al3(BO3)4 and YAl3(BO3)4 are low and no obvious inclusions are observed in these crytals.In addition,growth twins wrer detected in YbxY1-xAl3(BO3)4 crystal by using the chemical etching method.It is found that the growth twins occur frequently in Yb0.01Y0.9Al3(BO3)4 crystal whereas no growth twin appears in YAl3(BO3)4 crystal. Based on the experimental observations,the formation mechanism of growth twins is discussed.In the meantime,the effective measures for reducing the growth twins and defects are proposed.2001 Elsevier Science B.V.All rights reserved.
