Thermal and population induced lensing in Alexandrite lasers

Thermal and population induced lensing in Alexandrite lasers
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紫翠玉激光器中的热和粒子诱导透镜效应

DOI:
10.1117/12.2542289
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Tawy G
Tawy G
中科院分区:
--
文献类型:
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作者:
Tawy G

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本文综述了端面泵浦的紫翠宝石激光器的泵浦诱导透镜效应。利用Shack-Hartmann波前传感器测量了二极管泵浦的紫翠宝石激光器在非激光和激光条件下的折射透镜功率。在非激光条件下,测量了两种泵浦尺寸的透镜折射率,发现这两种情况下透镜的折射率与所吸收的泵浦功率几乎成线性关系。在激光条件下,透镜的屈光度降低了60%。基于一个由热透镜和由折射率电子分量产生的布居透镜组成的组合透镜的模型,非激射和激射实验结果很好地吻合。使用分析模型对两种泵尺寸的拟合参数也被发现是一致的。得到了激发态到基态极化率的差值,并发现与之前对紫翠宝石和其他掺铬增益介质的测量结果一致。
We present an overview of pump-induced lensing effects in end-pumped Alexandrite lasers. The dioptric lens power is measured for a diode pumped Alexandrite laser using a Shack-Hartmann wavefront sensor under both non-lasing and lasing conditions. Under non-lasing conditions, the lens dioptric power is measured for two pump sizes and in both cases is found to be nearly linear with respect to the absorbed pump power. Under lasing conditions the lens dioptric power is up to 60% weaker. Good agreement is found between the non lasing and lasing experimental results using a model based on a combined lens consisting of a thermal lens, and a population lens arising from the electronic component of the refractive index. Fitting parameters using an analytical model for the two pump sizes are also found to be consistent. Values for the difference in excited to ground state polarizability are obtained and found to be consistent with prior measurements for Alexandrite and other Chromium-doped gain media.
DOI: --
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