Some optical properties of Cr4+-doped crystals
Some optical properties of Cr4+-doped crystals
复制标题
DOI：
10.1016/s0925-3467(99)00020-8
复制
发表时间：
1999-10
影响因子：
3.9
通讯作者：
B. Lipavsky;Y. Kalisky;Z. Burshtein;Y. Shimony;S. Rotman
中科院分区：
文献类型：
--
作者：
B. Lipavsky;Y. Kalisky;Z. Burshtein;Y. Shimony;S. Rotman
We summarize briefly some of our past studies, and report of preliminary recent new results concerning the optical properties of Cr4+-doped crystals that are important for utilization as passive Q-switching devices in Nd:YAG laser systems. The host crystals involved are YAG, YSGG, GGG, LuAG and forsterite. Excited-state lifetimes of 4.0, 1.0 and 1.7 μs were measured by the Cr4+fluorescence decay (1.3–1.7 μm) following pulsed excitation at 1064 nm in YAG, YSGG and GGG, respectively. The ground- and excited-state absorption (ESA) cross-sections at λ=1064 nm were estimated from transmission saturation measurements. For [Cr4+,Mg2+]:YAG the respective results were σgs=(3.25±0.15)×10−18cm2and σes=(6.25±0.5)×10−19cm2. In the orthorhombic forsterite, the cross-sections were polarization dependent. We got σgs<(3.3±1)×10−19cm2for E‖a, σgs=(23±2)×10−19cm2and σes=(9.0±0.7)×10−19cm2for E‖b, and σgs=(16±1)×10−19cm2and σes=(5.7±0.4)×10−19cm2for E‖c. Polarised ESA spectra were measured between 680 and 960 nm using the pulsed pump/probe technique. At 750 nm we got σgs=(110±10)×10−19cm2and σes=(25±3)×10−19cm2for E‖b. Passive Q-switching performance of a flashlamp-pumped Nd:YAG laser using an intracavity [Cr4+,Ca2+]:GGG sample is also demonstrated.
