Thermal lensing characterization of a high-radiance 946nm planar waveguide laser

Thermal lensing characterization of a high-radiance 946nm planar waveguide laser
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高亮度 946nm 平面波导激光器的热透镜特性

DOI:
10.1117/12.922895
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发表时间:
2012
期刊:
--
影响因子:
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通讯作者:
Ng S
Ng S
中科院分区:
--
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作者:
Ng S

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我们介绍了准四级 Nd:YAG 平面波导 (PW) 激光器中面内热透镜的特性,该激光器配置为具有外部稳定腔的高辐射操作。我们的方法同时测量近场和远场位置处的激光器输出辐照度分布,以获得“实时”光束传播参数,从而获得光束品质因数 M2。结合腔内束腰处与腔内热透镜相关的光束尺寸的知识,对与功率相关的有效热透镜焦距进行了表征。在高达 87 W 的最大水平的所有入射泵浦功率下,获得了 >450 mm 的热透镜焦距。这一特性使得能够构建 29 W 946 nm PW 激光器,其输出辐射亮度达到创纪录的 4.3 TWm-2sr-1。
We present the characterization of the in-plane thermal lens in a quasi-four-level Nd:YAG planar waveguide (PW) laser configured for high-radiance operation with an external stable-cavity. Our approach utilises the measurement of the laser's output irradiance distribution at the near- and far-field positions concurrently in order to obtain the "real time" beam propagation parameter and thus beam quality factor, M2. Coupled with the knowledge of the intra-cavity-thermal-lens- dependent beam sizes at an intra-cavity beam waist, the power dependent effective thermal lens focal length was characterized. A thermal lens focal length of >450 mm was obtained at all incident pump powers up to the maximum level of 87 W. This characterization enabled the build of a 29 W 946 nm PW laser with a record output radiance of 4.3 TWm-2sr-1.
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