| 一体化Y型腔正交偏振氦氖激光器的温度场仿真与实验 |
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| 引用本文： | 龚梦帆,肖光宗,于旭东,张斌.一体化Y型腔正交偏振氦氖激光器的温度场仿真与实验[J].红外与激光工程,2016,45(5):505002-0505002(6). |
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| 作者姓名： | 龚梦帆 肖光宗 于旭东 张斌 |
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| 作者单位： | 1.国防科学技术大学 光电科学与工程学院,湖南 长沙 410073 |
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| 基金项目： | 国家自然科学基金(61308058) |
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| 摘 要： | 为了研究一体化Y型腔正交偏振氦氖激光器腔内温度场分布对其输出频差稳定性的影响,利用ANSYS有限元软件建立了该激光器的热力学模型。详细介绍了材料热参数的处理、激光器增益区热载荷的施加和换热系数的计算方法,通过仿真得到了该激光器腔体在稳态和瞬态情况下的温度场分布。采用红外热像仪设备拍摄得到腔体表面的实际温度值,与仿真结果对比,表明二者的温度值差异小于1%,建立的仿真模型准确可靠。激光器启动后,热量逐步从增益区向非增益区传导。当激光器温度分布稳定时,腔体存在明显的温度梯度分布,其中表面区域温度梯度最大;表面温度最高点位于阴极附近,最低点位于远离增益区的子腔体下表面。两子腔表面温度差值为0.05℃,引起的频差漂移为0.067 MHz。研究表明:激光器两子腔随时间变化产生的温度差值仍是制约激光器输出频差稳定性的主要因素,为下一步提高频差稳定性和优化激光器几何结构设计提供了指导。
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| 关 键 词： | 氦氖激光器 温度场仿真 ANSYS有限元 一体化Y型腔 |
| 收稿时间： | 2015-10-10 |
Temperature field simulation and experimental of orthogonal polarized He-Ne laser with integrated Y-shaped cavity |
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| Affiliation: | 1.College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,China |
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| Abstract: | Thermal effects could dramatically destroy the performances of the orthogonal-polarized He-Ne laser featured with an integrated Y-shaped cavity. To explore detailed impacts on the output frequency difference stability, one thermal model was established via the ANSYS software. Material disposals and heat source loading were presented, including the calculations of heat flux density and transfer coefficients. Thermal features were shown and discussed both in steady-state and transient-state. Later practical experiments were employed with a thermal infrared imager. The differences between simulations and experimental results were barely smaller than 1%, which had validated the accuracy and reliability of the simulations. After the laser setting to work, heat gradually transmitted from gain area to non-gain area. When the temperature distribution of the laser was in steady state, the cavity surface regions had maximum thermal gradient. The points maximum temperature were always near the cathode, while those with minimum temperature were close to the underlying surfaces of the sub-cavities. The temperature difference was about 0.05℃ between the surfaces of the sub-cavities, and the resulted frequency drift was about 0.067 MHz. It reveals that the time-dependent temperature divergences between two sub-cavity is still the main restricting factor in the stability of the laser output frequency difference, which can provide some important guidance for improving the stability of laser frequency difference and optimizing the design of laser geometry construction. |
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