Downconversion （DC） with emission of two near-infrared photons about 1000 nm for each blue photon absorbed was obtained in thulium （Tm3＋） and ytterbium （Yb3＋） codoped yt- trium lithium fluoride （LiYF4） singl...Downconversion （DC） with emission of two near-infrared photons about 1000 nm for each blue photon absorbed was obtained in thulium （Tm3＋） and ytterbium （Yb3＋） codoped yt- trium lithium fluoride （LiYF4） single crystals grown by an improved Bridgman method. The luminescent properties of the crystals were measured through photoluminescence excitation, emission spectra and decay curves. Luminescence between 960 and 1050 nm from yb3＋： 2Fs/2--＋2FT/2 transition, which was originated from the DC from Tm3＋ ions to Yb3＋ ions, was observed under the excitation of blue photon at 465 nm. Moreover, the energy transfer processes were studied based on the Inokuti-Hirayama model, and the results indicated that the energy transfer from Tm3＋ to Yb3＋ was an electric dipole-dipole interaction. The max- imum quantum cutting efficiency approached with 0.49mo1% Tm3＋ and 5.99mo1% Yb3＋. increasing the energy efficiency of crystalline energy part of the solar spectrum. up to 167.5% in LiYF4 single crystal codoped Application of this crystal has prospects for Si solar cells by photon doubling of the high展开更多
The Er^3＋/yb^3＋ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy （TEM） images showed that CaF2 nano-...The Er^3＋/yb^3＋ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy （TEM） images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3＋ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3＋ and Yb^3＋ was convinced and the possible mechanism of Er^3＋ up-conversion was discussed.展开更多
Crystal growth and optical properties of YbxY1 - xAl(BO3)(4)(abbreviated as Yb:YAB) are reported. Experimental results indicate that K2Mo3O10 is the most favorable flux for the growth of Yb:YAB. Based on the measured ...Crystal growth and optical properties of YbxY1 - xAl(BO3)(4)(abbreviated as Yb:YAB) are reported. Experimental results indicate that K2Mo3O10 is the most favorable flux for the growth of Yb:YAB. Based on the measured refractive indices, type I phase matching angle is calculated as theta (m) ( I ) = 34 degrees 12', which agrees well with the experimental result, theta (m) ( I ) = 34 degrees 38'. In the absorption spectra of this crystal, there exist two absorption bands located at 956 and 975 nm, respectively, which are suitable for InGaAs diode laser pumping, pi polarized absorption is slightly stronger than sigma polarized absorption at room temperature. In the fluorescence spectra, there are two fluorescence peaks located at 1.03 and 1.04 mu m respectively. The fluorescence lifetime at 1.03 mu m is 1.379 ms. The estimated emission cross section is in the magnitude of 10(-21) cm(2).展开更多
A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant di...A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant distinctions are revealed in many aspects of the lasing behavior for the Yb ion doped in the two crystal hosts, and Yb：LuPO_4 proves to be superior to Yb：LuVO4 since it enables efficient laser action to be much more easily achieved. With a 0.6 mm thick crystal plate of Yb：LuPO4, an output power of 3.30 W can be generated with an optical–optical conversion efficiency of 50.8%; whereas with a 2 mm long miniature crystal rod, the output power produced can reach 8.35 W with an optical–optical conversion efficiency of 46.7%.展开更多
We demonstrate a 1030-nm laser with end-pumped slab Yb:YAG geometry at room temperature.A maximum power of 86 W output at the pump power of 323 W is obtained.The optical-optical efficiency is about 26.6%and the slope ...We demonstrate a 1030-nm laser with end-pumped slab Yb:YAG geometry at room temperature.A maximum power of 86 W output at the pump power of 323 W is obtained.The optical-optical efficiency is about 26.6%and the slope efficiency is 31%.展开更多
文摘Downconversion （DC） with emission of two near-infrared photons about 1000 nm for each blue photon absorbed was obtained in thulium （Tm3＋） and ytterbium （Yb3＋） codoped yt- trium lithium fluoride （LiYF4） single crystals grown by an improved Bridgman method. The luminescent properties of the crystals were measured through photoluminescence excitation, emission spectra and decay curves. Luminescence between 960 and 1050 nm from yb3＋： 2Fs/2--＋2FT/2 transition, which was originated from the DC from Tm3＋ ions to Yb3＋ ions, was observed under the excitation of blue photon at 465 nm. Moreover, the energy transfer processes were studied based on the Inokuti-Hirayama model, and the results indicated that the energy transfer from Tm3＋ to Yb3＋ was an electric dipole-dipole interaction. The max- imum quantum cutting efficiency approached with 0.49mo1% Tm3＋ and 5.99mo1% Yb3＋. increasing the energy efficiency of crystalline energy part of the solar spectrum. up to 167.5% in LiYF4 single crystal codoped Application of this crystal has prospects for Si solar cells by photon doubling of the high
基金National Natural Science Foundation of China(51832007,52220105010)Natural Science Foundation of Shandong Province(ZR2020ZD35)Qilu Young Scholars Program of Shandong University。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61265004,51272097,and 11204113)the Nature and Science Fund from Yunnan Province Ministry of Education,China(Grant No.2011C13211708)
文摘The Er^3＋/yb^3＋ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy （TEM） images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3＋ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3＋ and Yb^3＋ was convinced and the possible mechanism of Er^3＋ up-conversion was discussed.
文摘Crystal growth and optical properties of YbxY1 - xAl(BO3)(4)(abbreviated as Yb:YAB) are reported. Experimental results indicate that K2Mo3O10 is the most favorable flux for the growth of Yb:YAB. Based on the measured refractive indices, type I phase matching angle is calculated as theta (m) ( I ) = 34 degrees 12', which agrees well with the experimental result, theta (m) ( I ) = 34 degrees 38'. In the absorption spectra of this crystal, there exist two absorption bands located at 956 and 975 nm, respectively, which are suitable for InGaAs diode laser pumping, pi polarized absorption is slightly stronger than sigma polarized absorption at room temperature. In the fluorescence spectra, there are two fluorescence peaks located at 1.03 and 1.04 mu m respectively. The fluorescence lifetime at 1.03 mu m is 1.379 ms. The estimated emission cross section is in the magnitude of 10(-21) cm(2).
基金Project supported by the National Natural Science Foundation of China(Grant No.11574170)
文摘A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant distinctions are revealed in many aspects of the lasing behavior for the Yb ion doped in the two crystal hosts, and Yb：LuPO_4 proves to be superior to Yb：LuVO4 since it enables efficient laser action to be much more easily achieved. With a 0.6 mm thick crystal plate of Yb：LuPO4, an output power of 3.30 W can be generated with an optical–optical conversion efficiency of 50.8%; whereas with a 2 mm long miniature crystal rod, the output power produced can reach 8.35 W with an optical–optical conversion efficiency of 46.7%.
文摘We demonstrate a 1030-nm laser with end-pumped slab Yb:YAG geometry at room temperature.A maximum power of 86 W output at the pump power of 323 W is obtained.The optical-optical efficiency is about 26.6%and the slope efficiency is 31%.
