采用外加电场极化法 ,实现了 Li Nb O3 晶体的周期性极化 ,并制备出周期为 9.5μm的三阶准相位匹配周期性极化 Li Nb O3 晶体 (PPLN) ;用准连续钛宝石激光器作基频光源 ,对准相位匹配周期性极化 Li Nb O3 进行了光学倍频实验 ,得到了 1 ...采用外加电场极化法 ,实现了 Li Nb O3 晶体的周期性极化 ,并制备出周期为 9.5μm的三阶准相位匹配周期性极化 Li Nb O3 晶体 (PPLN) ;用准连续钛宝石激光器作基频光源 ,对准相位匹配周期性极化 Li Nb O3 进行了光学倍频实验 ,得到了 1 2μW的蓝光输出。展开更多
New CCD photometric observations for asteroid（1028）Lydina,carried out with the 1-m and 2.4-m telescopes at Yunnan Observatory from 2011 December 19 to 2012 February 3,are presented.Using the new light curves,the rot...New CCD photometric observations for asteroid（1028）Lydina,carried out with the 1-m and 2.4-m telescopes at Yunnan Observatory from 2011 December 19 to 2012 February 3,are presented.Using the new light curves,the rotation period of 11.680±0.001 hours is derived with the Phase Dispersion Minimization（PDM） method.In addition,using the Amplitude-Aspect method,the elementary results of the pole orientation of asteroid（1028）Lydina are obtained：λp=111°＋4°-4°,βp=31°＋4°-5°. Meanwhile,the axial ratios of the tri-axial ellipsoid are estimated：a/b=1.77＋0.10 -0.08 and b/c=1.17＋0.07 -0.09 .展开更多
基金funded by the National Natural Science Foundation of China(Grant Nos.10933004 and 11073051)
文摘New CCD photometric observations for asteroid（1028）Lydina,carried out with the 1-m and 2.4-m telescopes at Yunnan Observatory from 2011 December 19 to 2012 February 3,are presented.Using the new light curves,the rotation period of 11.680±0.001 hours is derived with the Phase Dispersion Minimization（PDM） method.In addition,using the Amplitude-Aspect method,the elementary results of the pole orientation of asteroid（1028）Lydina are obtained：λp=111°＋4°-4°,βp=31°＋4°-5°. Meanwhile,the axial ratios of the tri-axial ellipsoid are estimated：a/b=1.77＋0.10 -0.08 and b/c=1.17＋0.07 -0.09 .
