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基于准相位匹配的掺铒飞秒光纤激光器倍频特性研究

Characteristics of Second Harmonic Generation in Erbium Doped Femtosecond Fiber Lasers Based on Quasi Phase Matching

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摘要

研究了不同厚度周期极化铌酸锂晶体(PPLN)对掺铒飞秒光纤激光器倍频特性的影响。基于非线性偏振旋转锁模原理和啁啾脉冲放大技术, 在1560 nm波段实现了重复频率为100 MHz, 输出功率为423 mW, 脉冲宽度为80 fs的掺铒飞秒光纤激光输出。以此为基频光源, 对0.5, 1, 10 mm三种不同厚度PPLN倍频晶体进行倍频特性研究, 实现了波长在780 nm的飞秒激光输出。其中采用0.5 mm晶体时获得了功率为100.4 mW、脉冲宽度为104 fs的倍频光输出, 倍频转换效率为23.7%; 采用1 mm晶体时获得了功率为165.0 mW、脉冲宽度为161 fs的倍频输出, 倍频转换效率为39%;采用10 mm晶体时获得了功率为185.5 mW, 脉冲宽度为305 fs的倍频光输出, 倍频转换效率达43.7%。并解释了倍频转换效率和倍频光脉冲宽度随PPLN晶体厚度的变化规律。实验数据为基于锁模光纤激光器产生780 nm波段飞秒光脉冲的研究提供了有益的参考。

Abstract

The second harmonic generation (SHG) characteristics of erbium doped femtosecond fiber lasers with different thicknesses of periodically poled lithium niobate crystals (PPLNs) are studied. Based on nonlinear polarization rotation mode locking and chirped pulse amplification, an erbium doped femtosecond fiber laser output with repetition rate of 100 MHz, output power of 423 mW, and pulse width of 80 femto-second (fs) is achieved at 1560 nm. Then we obtain 780 nm femtosecond lasers through SHG with three different PPLN crystals respectively. The thicknesses of PPLN crystals are 0.5, 1 and 10 mm. For 0.5 mm crystal, the SHG pulses with 104 fs width, 100.4 mW output power and 23.7% energy conversion efficiency can be obtained. For 1 mm crystal, the SHG pulses with 161 fs width,165.0 mW output power and 39% energy conversion efficiency can be obtained. For 10 mm crystal, the SHG pulses with 305 fs width, 185.5 mW output power and 43.7% energy conversion efficiency can be obtained. In addition, we explain how do energy conversion efficiency and pulse width of SHG pulses change with thickness of PPLN crystals. The experimental data provide a useful reference for the research of femtosecond optical pulses generated by mode-locked fiber laser at 780 nm band.

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中图分类号:O437

DOI:10.3788/cjl201845.0701001

所属栏目:激光器件与激光物理

基金项目:国家自然科学基金(91750203)

收稿日期:2017-11-27

修改稿日期:2018-01-30

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吴嘉瑞:北京大学人工微结构和介观物理国家重点实验室, 北京 100871
吕志强:北京大学人工微结构和介观物理国家重点实验室, 北京 100871
陆星:北京大学人工微结构和介观物理国家重点实验室, 北京 100871
刘关玉:北京大学区域光纤通信网与新型光通信系统国家重点实验室, 北京 100871
杨宏:北京大学人工微结构和介观物理国家重点实验室, 北京 100871
施可彬:北京大学人工微结构和介观物理国家重点实验室, 北京 100871

联系人作者:杨宏(yanghong@pku.edu.cn)

备注:吴嘉瑞(1993-), 男, 硕士研究生, 主要从事超快非线性光学、飞秒光纤激光器方面的研究。E-mail: wujiarui@pku.edu.cn

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引用该论文

Wu Jiarui,Lü Zhiqiang,Lu Xing,Liu Guanyu,Yang Hong,Shi Kebin. Characteristics of Second Harmonic Generation in Erbium Doped Femtosecond Fiber Lasers Based on Quasi Phase Matching[J]. Chinese Journal of Lasers, 2018, 45(7): 0701001

吴嘉瑞,吕志强,陆星,刘关玉,杨宏,施可彬. 基于准相位匹配的掺铒飞秒光纤激光器倍频特性研究[J]. 中国激光, 2018, 45(7): 0701001

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