Solar-pumped Cr/Nd: YAG ceramic laser focused by Fresnel lens

LU Yu; SHEN Zuo-chun

doi:10.3788/OPE.20162413.0294

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Solar-pumped Cr/Nd: YAG ceramic laser focused by Fresnel lens

更新时间：2020-08-13

- Solar-pumped Cr/Nd: YAG ceramic laser focused by Fresnel lens
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 294-299(2016)
- 作者机构：
  
  1. 天津职业技术师范大学天津,300222
  2. 哈尔滨工业大学可调谐激光技术研究所,黑龙江哈尔滨,150080
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0294
  CLC： TN241;TN248.1
- Received：31 May 2016，
  
  Revised：01 July 2016，
  
  Published：14 November 2016
- 稿件说明：
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芦宇, 申作春,. 菲涅尔透镜聚焦太阳光泵浦Cr/Nd:YAG陶瓷激光器[J]. 光学精密工程, 2016,24(10s): 294-299

LU Yu, SHEN Zuo-chun,. Solar-pumped Cr/Nd: YAG ceramic laser focused by Fresnel lens[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 294-299
芦宇, 申作春,. 菲涅尔透镜聚焦太阳光泵浦Cr/Nd:YAG陶瓷激光器[J]. 光学精密工程, 2016,24(10s): 294-299 DOI： 10.3788/OPE.20162413.0294.

LU Yu, SHEN Zuo-chun,. Solar-pumped Cr/Nd: YAG ceramic laser focused by Fresnel lens[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 294-299 DOI： 10.3788/OPE.20162413.0294.

摘要

菲涅尔透镜聚焦太阳能泵浦Cr/Nd：YAG陶瓷激光器中，泵浦光斑与激光棒一次轴向耦合度对激光输出功率有很大影响。采用跟踪偏差方法，即太阳光入射方向与菲涅尔透镜表面法向量不平行导致聚焦光斑与激光棒耦合度不同的方法，实验获得了激光输出功率随偏转角度的变化关系。该实验采用漫反射陶瓷腔，降低了二次或多次反射聚焦泵浦对输出功率的影响。实验结果表明，输出镜反射率为97%与99%两种情况下，跟踪偏差角度从0增加到0.5时，激光输出功率降低到初始功率的约1/6倍。所建立的匹配实验的物理模型其理论计算相同偏差角度结果与实验相符合。实验与理论均表明泵浦光与激光棒一次泵浦的轴向耦合效果最好，因此除去端面遮挡，通过增加二次聚光器获得高轴向耦合的端面泵浦光可以大幅度提高激光的输出功率。

Abstract

In solar-pumped laser with Fresnel lens and Cr/Nd:YAG ceramic

the laser output power depend highly on coupling factor of pumping light and laser rod in the axial direction. In this paper

the method of tracking angle error attributed to the incident solar ray unparallel with surface normal of Fresnel lens result

was used to calculate the dependence of laser output power on angles experimentally. By using ceramics cavity

the effect of secondary or more reflection beam condenser on the output power was reduced. The experiment result shows that the laser output powers are reduced by 1/6 of the original ones from 0to 0.5 for refractivity of 97% and 99%

respectively. The physical model was set up to analyze the effect in different tracking angle errors

where the calculation value is in agreement with the experiment result. Results indicate that the beam and laser rod coupled in axial direction perfectly

thereby the removal of the end mask and the adoption of the second condenser will obtain highly axially coupling end pumping beam by which the laser output power is improved greatly.

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references

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