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Acta Optica Sinica

Cr^4+:YAG可饱和吸收特性测量

Mali Gong, 翟刚, 时顺森, 刘彦巍, Nan Ma, 李晶, 王更生, 丁育明, 金锋

Published Jan 1, 1998• 0 citations
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Abstract

测量了Cr^4+:YAG材料的可饱和吸收特性,用多种数据分析方法处理了实验结果,Cr^4+:YAG的基态吸收截面σgs=11×10^-19cm^2,激光发态吸收截面σgs=1.2×10^-19cm^2。

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应用激光吸收和荧光方法,测量了Cs(6P)态与Ne碰撞的精细结构转移和碰撞猝灭截面。Cs原子被激光激发到6P3/2态,将与泵浦激光束反向平行的检测激光束调到6PJ→8S1/2的跃迁,测量6PJ激发态的密度及空间分布,由此计算了6PJ→06S的有效辐射率。在T=337K和Ne密度0.5×10^18〈N〈4×10^18cm^-3。范围内测量了6P1/2→6S1/2(895nm)发射的敏化荧光强度I895,量N/I895与N有抛物线型的关系,表明6PJ的猝灭是由于与Ne原子的碰撞产生的,而不是由与Cs基态原子碰撞产生的。由最小二乘法确定的二次多项式的系数得到6P态与Ne碰撞精细结构转移截面σ21=(1.90±0.82)×10^-19cm^2,猝灭截面σD=(8.97±3.85)×10^-19cm^2。
Saturation absorption experiments are conducted on the title compound at 1.064 μm with laser light propagating along both the [001] and [111] crystallographic axes. Rotation of the crystals about these axes during the experiments reveals that the transmission of the polarized 1.064 μm radiation is highly anisotropic in the saturation regime. The details of the anisotropy and saturation curves are explained using a simple model of subsets of optical centers along with a relevant set of rate equations. The ground and excited-state absorption cross sections at 1.064 μm are calculated to be σgs=5.7(±2)×10−18 cm2 and σes=8(±2)×10−19 cm2, respectively, and the optimum crystallographic orientation for utilization in optical devices is discussed.
研究了Cs(6^2P)多重态分别与N2、He的光学碰撞中的精细结构分支比,定义分支比为|(D1)/|(D2),|(D1)、|(D2)分别为Ca的D1和D2线的荧光强度。单模半导体激光器激发Cs原子到6P3/2态,通过与N2、He的激发转移、碰撞传能研究了6^2p原子的精细结构混合。得到了6P3/2→6P1/2的转移截面如下:Cs-He的转移截面为σ21=2.25×10^-19cm^2,Cs-N2的转移截面为σ21=1.808×10^-18cm^2。并对结果进行了讨论。