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Some optical properties of Cr~4+-doped crystals

机译：Cr〜4 +掺杂晶体的某些光学性质

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We summarize briefly some of our past studies, and report of preliminary recent new results concerning the optical properties of Cr~4+-doped crystals that are important for utilization as passive Q-switching devices in NdtYAG 1aser systems. The host crystals involved are YAG, YSGG, GGG, LuAG and forsterite. Excited-state lifetimes of 4.0, l.0 and 1.7 μs were measured by the Cr~4+ fluorescence decay (l.3--l.7 μm) following pulsed excitation at l064 nm in YAG, YSGG and GGG, respectively. The ground- and excited-state absorption (ESA) cross-sections at λ = l064 nm were estimated from transmission saturation measurements. For [Cr~4+Mg~2+]:YAG the respective results were σgs = (3.25 ± 0.15) x l0~-18 cm~2 and σes = (6.25 ± 0.5) x l0~-l9 cm~2. In the orthorhombic forsterite, the cross-sections were polar- ization dependent. We got ags < (3.3 ± l) x l0~-l9 cm~2 for EⅡa, σgs = (23 ± 2) x l0~-l9 cm~2 and σes = (9.0 ± 0.7) x l0~-l9 cm~2 for EⅡb, and σgs = (16 ± l) x l0~-l9 cm~2 and σes = (5.7 ± 0.4) x l0~-l9 cm~2 for EⅡc. Polarised ESA spectra were measured between 680 and 960 nm using the pulsed pump/probe technique. At 750 nm we got σgs = (110 ± l0) x l0~-19 cm~2 and σes = (25 ± 3) x 10~-l9 cm~2 for EⅡb. Passive Q-switching performance of a flashlamp-pumped Nd:YAG laser using an intracavity [Cr~4+,Ca~2+]:GGG sample is also demonstrated.
机译：我们简要总结了我们过去的一些研究，并报告了有关Cr〜4 +掺杂晶体的光学性质的最新近期初步结果，这些结果对于在NdtYAG 1aser系统中用作无源Q开关器件很重要。涉及的主体晶体是YAG，YSGG，GGG，LuAG和镁橄榄石。在YAG，YSGG和GGG中分别在1064 nm处进行脉冲激发后，Cr〜4 +荧光衰减（1.3--1.7μm）测得的激发态寿命为4.0、1.0和1.7μs。 λ= 1064 nm处的基态和激发态吸收（ESA）截面是根据透射饱和度测量值估算的。对于[Cr〜4 + Mg〜2 +]：YAG，各自的结果为σgs=（3.25±0.15）x l0〜-18 cm〜2和σes=（6.25±0.5）x l0〜-19 cm〜2。在斜方镁橄榄岩中，横截面与极化有关。 EⅡa的ags <（3.3±l）x l0〜-9 cm〜2，σgs=（23±2）x l0〜-l9 cm〜2和σes=（9.0±0.7）x l0〜-9 cm〜 EⅡb为2，σgs=（16±l）x l0〜-19 cm〜2，σes=（5.7±0.4）x l0〜-9 cm〜2。使用脉冲泵浦/探针技术在680至960 nm之间测量了极化ESA光谱。在750 nm处，EⅡb的σgs=（110±10）x l0〜-19 cm〜2，σes=（25±3）x 10〜-19 cm〜2。还证明了使用腔内[Cr〜4 +，Ca〜2 +]：GGG样品的闪光灯泵浦Nd：YAG激光器的无源Q开关性能。

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