中红外可调谐大能量飞秒脉冲激光产生

周华; 姚传飞; 贾志旭; 吴长锋; 秦冠仕; 秦伟平

doi:10.3788/fgxb20204104.0435

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中红外可调谐大能量飞秒脉冲激光产生

器件制备及器件物理 | 更新时间：2020-08-12

- 中红外可调谐大能量飞秒脉冲激光产生
- Mid-infrared Tunable High Pulse Energy Femtosecond Pulse Laser Generation
- 发光学报 2020年41卷第4期页码：435-441
- 作者机构：
  
  1. 北京工业大学激光工程研究院北京,100124
  2. 吉林大学电子科学与工程学院, 集成光电子学国家重点联合实验室,吉林长春,130012
  3. 南方科技大学生物医学工程系,广东深圳,518055
- 作者简介：
- 基金信息：
  
  国家自然科学基金（61378004，61527823，61605058，61827821）资助项目()
- DOI：10.3788/fgxb20204104.0435
  中图分类号：
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周华, 姚传飞, 贾志旭, 等. 中红外可调谐大能量飞秒脉冲激光产生[J]. 发光学报, 2020,41(4):435-441.

ZHOU Hua, YAO Chuan-fei, JIA Zhi-xu, et al. Mid-infrared Tunable High Pulse Energy Femtosecond Pulse Laser Generation[J]. Chinese Journal of Luminescence, 2020,41(4):435-441.
周华, 姚传飞, 贾志旭, 等. 中红外可调谐大能量飞秒脉冲激光产生[J]. 发光学报, 2020,41(4):435-441. DOI： 10.3788/fgxb20204104.0435.

ZHOU Hua, YAO Chuan-fei, JIA Zhi-xu, et al. Mid-infrared Tunable High Pulse Energy Femtosecond Pulse Laser Generation[J]. Chinese Journal of Luminescence, 2020,41(4):435-441. DOI： 10.3788/fgxb20204104.0435.

摘要

可调谐中红外飞秒光纤激光器具有非常普遍的应用，从而引起了人们的广泛关注。目前，非线性光纤中的拉曼孤子自频移效应是实现大范围可调谐飞秒脉冲激光的理想方法之一。然而，非线性光纤中其他高阶非线性效应的产生通常会限制拉曼孤子脉冲的能量提升。本文提出了利用有源掺杂光纤作为非线性介质和增益介质实现可调谐大能量中红外飞秒激光脉冲的方法。在理论上研究了有源掺杂非线性光纤中高阶孤子劈裂和孤子自频移效应的产生，以及线性增益对波长移动拉曼孤子能量、脉宽、光谱的影响。结果表明，通过为波长红移的低能量拉曼孤子提供线性增益，孤子脉冲的能量得到了显著提升且保持了其单脉冲特性，脉冲宽度为45 fs，且孤子脉冲的波长可通过所提供的增益进行大范围调谐。因此，利用有源掺杂光纤作为非线性介质是实现大能量可调谐中红外飞秒脉冲激光的一种有效方法。

Abstract

Mid-infrared tunable femtosecond fiber laser has attracted many attentions for widely applications. Recently, Raman soliton self-frequency shifting effect in nonlinear fibers was regarded as a promising approach to obtain such pulse laser. However, other higher order nonlinear effects occurred in fibers will limit the pulse energy promoting. So, to further enhance the pulse energy of Raman soliton, we proposed a novel method where the rare-earth doped nonlinear fiber was used as nonlinear medium. We numerically investigated the impacts of the optical gain on the pulse energy, pulse width and spectrum of the wavelength shifting Raman soliton. The results show that as the Raman soliton shifted into the wavelength range where the optical gain introduced, the pulse energy of the soliton pulse was enlarged by several times, and the pulse width was compressed to 45 fs. Meanwhile, the wavelength of the femtosecond Raman soliton pulse can be widely tuned by changing the optical net gain. Therefore, by using rare-earth doped fiber as the nonlinear medium and gain medium, we can achieve the generation of mid-infrared tunable high pulse energy femtosecond pulse laser.

关键词

中红外飞秒脉冲可调谐孤子自频移效应线性增益

Keywords

mid-infrared femtosecond pulsetunablesoliton self-frequency shifting effectsoptical gain

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