增益介质位置对腔外倍频效率的影响

李嘉琦; 冯国英; 邓国亮; 陈永富; 周寿桓

doi:10.11884/HPLPB201830.170452

增益介质位置对腔外倍频效率的影响

doi: 10.11884/HPLPB201830.170452

李嘉琦^1,,
冯国英^1, ,,
邓国亮¹,
陈永富²,
周寿桓^{1, 3}

1.
四川大学电子信息学院激光微纳工程研究所, 成都 610064
2.
台湾交通大学理学院电子物理系, 台湾新竹 30010
3.
华北光电技术研究所, 北京 100015

基金项目: 国家自然科学基金项目

详细信息

作者简介:
李嘉琦(1993—)，男，硕士研究生，主要从事光电子技术等方面研究；viacactus@163.com

通讯作者:
冯国英(1969—)，女，教授，博士生导师，主要从事新型激光技术方面的研究；guoing_feng@scu.edu.cn

中图分类号: TN248.1
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- 被引次数: 0
出版历程
- 收稿日期: 2017-11-09
- 修回日期: 2017-12-27
- 刊出日期: 2018-04-15

Effect of the gain medium position on the external second harmonic generation conversion efficiency

1.
Institute of Laser and Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
2.
Department of Electrophysics, National Chiao Tung University, Taiwan Hsinchu 30010, China
3.
North China Research Institute of Electro-Optics, Beijing 100015, China

摘要

摘要: 采用MgO掺杂的周期性极化铌酸锂晶体作为非线性晶体，搭建了线性平-凹腔结构的外腔式倍频系统，分析了增益介质和输入耦合镜之间的距离对二次谐波转换效率的影响。实验中，使用光纤耦合二极管泵浦Nd: YVO₄激光器作为基频光源，通过改变增益介质和输入耦合镜的间距，测量了激光器的纵模数量、锁模脉冲稳定性、基频光线宽以及光-光转换效率。实验结果显示，增加增益介质和输入耦合镜之间的距离，可以在一定程度上提升自锁模脉冲的稳定性并有效减小基频光线宽。当泵浦功率较高时，适当增加该间距可以有效提升二次谐波转换效率。
- 二次谐波 /
- 周期性极化晶体 /
- Nd: YVO₄ /
- 转换效率 /
- 激光器
Abstract: The effect of the gain medium position in the resonator on the external second harmonic generation (SHG) conversion efficiency was studied. A MgO-doped periodically poled LiNbO₃ crystal (MgO: PPLN) was utilized to achieve a 532-nm green-light laser outside the resonator of a mode-locked diode-pumped Nd: YVO₄ 1064-nm laser. We theoretically and experimentally verified that increasing the mirror/crystal separation could reduce the longitudinal mode number, narrow the linewidth and stabilize the mode locked pulse owing to the spatial burning hole effect. These phenomena would further affect the SHG conversion efficiency.The experimental results show that, increasing the mirror/crystal separation could promote the SHG conversion efficiency with the fixed focus length, especially at the higher pump power. The theoretical analysis and experimental results have reference significance for improving the SHG efficiency of the external end-pumped mode-locked laser.
- second harmonic generation /
- MgO: PPLN /
- Nd: YVO₄ /
- conversion efficiency /
- laser

HTML全文

图 1 (a) 实验装置示意图；(b)基频光功率为1.54 W时，532 nm的输出功率和晶体加热温度的关系图

Figure 1. (a) Schematic of the experimental setup; (b) Experimental results of the output power at 532 nm as a function of crystal temperature (fundamental power P=1.54 W)

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图 2 在不同泵浦功率下，基频光功率和间距d之间的关系(a)及SHG转换效率和间距d之间的关系(b)

Figure 2. (a) The fundamental power, (b) the SHG conversion efficiency as a function of the separation d at various pump power

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图 3 (a) d=3.5 mm时实验测量得到的光谱图；(b) d=12 mm时实验测量得到的光谱图；(c)线宽和间距d的关系图；(d)理论计算和实验测量得到的纵模数量和间距d之间的关系图

Figure 3. (a) d=3.5 mm, (b) d=12 mm, experimental optical spectra for different crystal/mirror separation d; (c) the linewidth as a function of the separation d; (d) experimental results and theoretical calculation of the number of longitudinal lasing modes as a function of the separation d

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图 4 两个不同时间域下的脉冲序列

Figure 4. Pulse trains on two different timescales

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