Power-scaling Nd:YAG's quasi-four-level transition

Power-scaling Nd:YAG's quasi-four-level transition
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功率缩放 Nd:YAG 的准四能级跃迁

DOI:
10.1117/12.847996
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发表时间:
2010
期刊:
--
影响因子:
--
通讯作者:
Mackenzie J
Mackenzie J
中科院分区:
--
文献类型:
--
作者:
Mackenzie J

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提高 Nd:YAG 的 4F3/2→4I9/2 准四能级跃迁的输出功率对于为生命科学接口、测距和传感应用提供波长低于 1 微米的高辐射源很有吸引力,或者当频率转换为可见光谱的蓝绿部分时作为下一代显示技术的重要元件。激光波长处的重吸收损耗与相对较低的受激发射截面以及与更强的 1.06 微米跃迁的竞争相结合,需要具有与 808 nm 处的泵浦饱和强度相当的高泵浦强度的配置,以实现高效运行。然而,即使使用越来越亮的二极管激光器,激发循环的热不足和 YAG 主体介质的热光特性目前限制了 9xx nm 下可实现的输出功率。这里介绍的是双包层平面波导 Nd:YAG 激光器,工作激光波长为 946 nm,输出功率为 100 W,光光转换效率高于 50%。波导结构增强的热管理特性使得功率扩展远远超出了体激光器配置中可能实现的范围。我们将讨论这些优点和进一步的功率扩展可能性。
Increasing the output power of Nd:YAG's4F3/2→4I9/2quasi-four-level transition is attractive for providing a highradiance source with a wavelength below 1micron for applications at the life sciences interface, ranging and sensing, or as a vital element for next-generation display technologies, when frequency converted into the blue-green part of the visible spectrum. Reabsorption losses at the lasing wavelength combined with a relatively low stimulated emission crosssection and competition with the much stronger 1.06 micron transition, demands a configuration with high pumping intensity, comparable to the pump saturation intensity at 808 nm, to achieve efficient operation. However, even with the availability of increasingly bright diode-lasers, the thermal deficit of the excitation cycle and the thermo-optic properties of the YAG host medium currently limit the achievable output power at 9xx nm. Presented here is a double-clad planarwaveguide Nd:YAG laser, operating at a lasing wavelength of 946 nm with an output power in the 100 W regime and better than 50% optical to optical conversion efficiency. The enhanced thermal management characteristics of the waveguide structure have enabled power-scaling well beyond that possible in a bulk laser configuration. These advantages and further power-scaling possibilities will be discussed.
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DOI: 10.1364/assp.2005.tub34
发表时间: 2005
影响因子: 2.5
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DOI: 10.1109/jqe.2002.808158
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