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首页> 外文学位 >Thermal Lensing in a High Power Diode-Pumped Continuous Wave Yb+3:KY(WO4)2 Laser.
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Thermal Lensing in a High Power Diode-Pumped Continuous Wave Yb+3:KY(WO4)2 Laser.

机译：高功率二极管泵浦连续波Yb + 3：KY（WO4）2激光器中的热透镜。

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摘要

High power diode-pumped solid state (DPSS) lasers are a rapidly growing technology that is attractive for various applications in scientific and industrial fields. DPSS lasers are highly efficient, reliable and durable with superior beam quality when compared to flash-lamp pumped lasers. Double-tungstate crystals such as potassium yttrium tungstate Yb:KY(WO4)2 (Yb:KYW) are one of the most popular active materials used in DPSS lasers for generation of continuous wave radiation and ultrashort (i.e. femtosecond, 10-15 s) pulses with high average output power. The high pump power of laser diodes results in considerable heat generation in a laser crystal that in turn causes thermal lensing effect. Thermal lensing affects the performance and stability of a resonator, and plays an important role in limiting the output power and degrading the beam quality of solid state lasers. Despite these facts, no detailed studies of thermal effects in Yb:KYW lasers were reported to date. In this work thermal lensing in a diode-pumped Ng-cut Yb:KYW laser operating at the wavelength of 1.04 ?m was characterized. A maximum output power of 3.5 W with a nearly diffraction limited output beam (M 2 < 1.2) was achieved under the absorbed pump power of 13.8 W. The focal lengths of the induced thermal lenses were obtained from the laser output beam size measurements at various incident pump power levels and ABCD matrix analysis. At maximum output power the focal length of the induced thermal lens was found to be 814 mm for the Nm direction (horizontal) and 144 mm for the Np direction (vertical). Thermal lens sensitivity factors were 1.26 m-1/W and 0.32 m-1/W for the Np and Nm directions, respectively. This highly astigmatic thermal lensing can be explained by strong anisotropy of thermo-optical properties of the crystal and its cooling geometry. In addition, the finite element analysis (FEA) method was employed to obtain the focal lengths of the induced thermal lens inside the crystal. Simulation results obtained from the theoretical model were compared to experimental data, and the accuracy of the model was verified. The results of this work are critical for practical design of the efficient and reliable Yb:KYW lasers with multi-Watt average output power.
机译：高功率二极管泵浦固态（DPSS）激光器是一种快速发展的技术，在科学和工业领域的各种应用中具有吸引力。与闪光灯泵浦激光器相比，DPSS激光器高效，可靠，耐用，并具有出众的光束质量。双钨酸晶体，例如钨酸钇钇Yb：KY（WO4）2（Yb：KYW），是DPSS激光器中用于产生连续波辐射和超短（即飞秒，10-15 s）的最受欢迎的活性材料之一。平均输出功率高的脉冲。激光二极管的高泵浦功率会在激光晶体中产生大量热量，进而产生热透镜效应。热透镜会影响谐振器的性能和稳定性，并在限制输出功率和降低固态激光器的光束质量方面发挥重要作用。尽管有这些事实，迄今为止，尚未报道有关Yb：KYW激光器中热效应的详细研究。在这项工作中，对在波长为1.04μm的二极管泵浦Ng切割的Yb：KYW激光器中的热透镜进行了表征。在13.8 W的吸收泵浦功率下，获得了近乎衍射极限的输出光束（M 2 <1.2）的最大输出功率为3.5W。感应热透镜的焦距是通过在各种条件下的激光输出光束尺寸测量得出的泵的入射功率水平和ABCD矩阵分析。在最大输出功率下，发现感应热透镜的焦距在Nm方向（水平）为814 mm，在Np方向（垂直）为144 mm。对于Np和Nm方向，热透镜灵敏度因子分别为1.26 m-1 / W和0.32 m-1 / W。这种高度散光的热透镜可以通过晶体的热光学特性及其冷却几何形状的强各向异性来解释。此外，采用有限元分析（FEA）方法获得晶体内部感应热透镜的焦距。将理论模型获得的仿真结果与实验数据进行比较，并验证了模型的准确性。这项工作的结果对于高效设计和可靠的具有多瓦平均输出功率的Yb：KYW激光器的实际设计至关重要。

著录项

  • 作者

    Mirzaeian, Hamidreza.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Electrical engineering.;Condensed matter physics.;Optics.
  • 学位 M.Sc.
  • 年度 2013
  • 页码 68 p.
  • 总页数 68
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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