Temperature effects on tunable cw Alexandrite lasers under diode end-pumping.
Temperature effects on tunable cw Alexandrite lasers under diode end-pumping.
复制标题
二极管端面泵浦下温度对可调谐连续紫翠玉激光器的影响。
DOI：
10.1364/oe.26.007771
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发表时间：
2018
期刊：
影响因子：
3.8
通讯作者：
M. Damzen
中科院分区：
文献类型：
--
作者：
W. Kerridge;M. Damzen
二极管泵浦的翠绿宝石是一种很有前途的高功率，高效和廉价的激光器，具有宽（701 nm至858 nm）的增益带宽;然而，其复杂的激光动力学存在挑战。我们提出了一个分析模型，应用于实验的红色二极管端面泵浦的紫翠宝石激光器，使记录的54%的斜率效率与输出功率为1.2 W。通过在振动模式下将晶体温度优化在8 °C和105 °C之间，获得了创纪录的最低激射波长（714 nm）和创纪录的调谐范围（104 nm）。研究了紫翠宝石的性质和分析模型，以理解和给出优化紫翠宝石激光器的一般规则，沿着它们的基本效率极限。发现最低阈值激光波长不一定是最有效的，并且较高和较低的温度分别对于较长和较短的激光波长是最佳的。通过将晶体温度从10 °C改变到90 °C，测得泵浦激发与基态吸收比从0.8降低到0.7。
Diode pumped Alexandrite is a promising route to high power, efficient and inexpensive lasers with a broad (701 nm to 858 nm) gain bandwidth; however, there are challenges with its complex laser dynamics. We present an analytical model applied to experimental red diode end-pumped Alexandrite lasers, which enabled a record 54 % slope efficiency with an output power of 1.2 W. A record lowest lasing wavelength (714 nm) and record tuning range (104 nm) was obtained by optimising the crystal temperature between 8 °C and 105 °C in the vibronic mode. The properties of Alexandrite and the analytical model were examined to understand and give general rules in optimising Alexandrite lasers, along with their fundamental efficiency limits. It was found that the lowest threshold laser wavelength was not necessarily the most efficient, and that higher and lower temperatures were optimal for longer and shorter laser wavelengths, respectively. The pump excited to ground state absorption ratio was measured to decrease from 0.8 to 0.7 by changing the crystal temperature from 10 °C to 90 °C.