摘要
为了研究不同的抽运光分布对晶体端面温度场的影响,提出一种平顶光的归类方法,并依据所提出的平顶光的归类方法划分出圆柱光、高斯光和平顶光.重点研究了圆柱光、高斯光和平顶光在不同的功率和不同的焦斑半径下端面温度分布.发现在相同的抽运功率和相同的光斑半径下圆柱光抽运时晶体的端面温度最高,平顶光次之,高斯光最小的重要结论,说明抽运光的分布严重影响晶体端面的温度场.最后讨论了端面温度场引起的热效应对DPL光束质量的影响,发现端面热效应引起端面热透镜等效曲率半径减小,从而引起束腰半径的减小.热效应引起热透镜等效曲率半径减小,曲率半径在85mm和150mm之间时,振荡光远场发散角和腔内束腰半径均急剧变化,激光器工作于非稳区.
In order to study how different pumping light profiles affect the crystal end temperature field, a classification creterion is suggested, according to which the pumping light can be classified as column light, Gaussian light and plane top light. The end temperature under different pumping power and different pumping light focus diameter are studied. It was found that the end temperature is the highest under the column pumping light, intermediate plane top pumping light and lowesl under Gaussian pumping light when the pumping light has the same power and the same focus diameter. It shows that the pumping light profile can seriously affect the crystal end temperature field. Finally the effect of the thermal effect caused by the end temperature was studied, which was found to affect the laser quality seriously. When the equivalent curvature radius of the thermal lens changes from 85 to 150 mm, the far field walk-off angle and waist diameter become larger and larger and the laser works unsteadily.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期223-229,共7页
Acta Physica Sinica
基金
西安建筑科技大学基础基金(批准号:JC0717)资助的课题~~
关键词
圆柱光
平顶光
端面抽运
温度场
column light, plane top pumping light, end pumping, temperature field
