1 华东师范大学精密光谱科学与技术国家重点实验室，上海 200062
2 中国计量大学光学与电子科技学院，浙江 杭州 310018
3 南开大学现代光学研究所，天津 300071
探索了一种基于两束相向传播飞秒光丝诱导荧光的光谱检测方法。实验结果表明，该方法能够延长荧光衰减时间，增强物质特征谱线强度。将该方法应用于盐水溶液中金属离子（K+、Na+、Mg2+）特征峰及含量的检测，其对Na+含量的检测灵敏度为4.3×10-6，较相同激发脉冲能量下的单丝诱导荧光检测技术提升了4倍，且具有良好的线性度。该方法有望为污染物检测提供新途径。
光谱学 光丝 荧光光谱 飞秒激光
1 华东师范大学精密光谱科学与技术国家重点实验室，上海 200062
2 华东师范大学重庆研究院精密光学重庆市重点实验室，重庆 401147
3 南开大学现代光学研究所，天津 300071
将时间拉伸色散傅里叶变换测量方法应用于飞秒光丝成像研究。通过光谱-空间编码的方式，结合高速单点探测器及示波器，实现了对飞秒光丝瞬态演化过程的一维成像。成像空间分辨率为60 μm，刷新速率为54.54 MHz。本文方法避开了CCD对图像刷新率的限制，为研究光丝与物质相互作用动力学提供了新方法。
超快光学 光丝 成像 傅里叶变换 飞秒激光 激光与光电子学进展
2022, 59(13): 1336001
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2 Chongqing Institute of East China Normal University, Chongqing 401147, China
3 Jinan Institute of Quantum Technology, Jinan 250101, China
In this paper, we demonstrated a series of short-living mode-locking (ML) states (each lasting a few to a hundred microseconds) that happened before a fiber laser reached a steady ML state. With time-stretched dispersion Fourier transform spectroscopy, a rich diversity of transient multi-pulse dynamics were revealed spectrally and temporally. As a result, we found that the formation of the short-living ML states was related to abundant pump power, and their decaying evolution dynamics were possibly governed by gain depletion and recovery. Our results revealed unexpected transient lasing behaviors of a soliton laser and thus might be useful to understand the complex dynamics of mode-locked lasers.
mode-locking soliton fiber laser Chinese Optics Letters
2021, 19(7): 071401
