Time–Frequency and Spectrum Analyses of All-Solid-State Self-Mode-Locked Burst Pulse Lasers

Author:

Xu Mengmeng1,Hu Miao1,Li Zerong1,Wang Jinxiu1,Fu Jiaxin1,Wang Shaokun1,Ji Yingying1,Li Haozhen1,Bi Meihua1,Zhou Xuefang1,Pan Sunqiang2,Liu Chong3

Affiliation:

1. College of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

2. Key Laboratory of Energy and Environmental Protection Measurement of Zhejiang Province, Zhejiang Institute of Metrology, Hangzhou 310015, China

3. College of Optoelectronic Science and Engineering, Zhejiang University, Hangzhou 310027, China

Abstract

The theoretical and experimental characteristics of all-solid-state self-mode-locked burst pulse lasers are investigated in this study. The time–frequency and spectrum analyses of the lasers incorporating Fabry–Pérot (F-P) structures are presented, along with the development of the corresponding theoretical model. Self-mode-locked burst pulse lasers are experimentally constructed to reduce intracavity losses using the front and rear end surfaces of the gain media to form F-P structures. When the laser cavity length is 600 mm and the gain media lengths are 5, 6, and 10 mm, each burst pulse produced contains 56, 47, and 28 subpulses, respectively, with the same burst pulse width of 2 ns. The burst pulse train with beam quality M2 = 1.37 and an average output power of 0.23 W is obtained when the gain medium length is 5 mm and the pump power is 4.5 W. The corresponding burst pulse repetition frequency is 0.25 GHz and the subpulse repetition frequency is 13.66 GHz. The time–frequency spectral analyses of the laser signals provide a good representation of laser spectral information that even the currently available highest-resolution spectrometers cannot resolve.

Funder

Primary Research and Development Plan of Zhejiang Province

Key Research and Development Program of Zhejiang Province

Fundamental Research Funds for the Provincial Universities of Zhejiang

Publisher

MDPI AG

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