Browsing by Author "Wei, Rongling"

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    172 fs, 24.3 kW peak power pulse generation from a Ho-doped fiber laser system
    (2018-10-01) Wang, Mengmeng; Zhang, Hui; Wei, Rongling; Zhu, Zexiu; Ruan, Shuangchen; Yan, Peiguang; Wang, Jinzhang; Hasan, Tawfique; Sun, Zhipei; Department of Electronics and Nanoengineering; Department of Applied Physics; Centre of Excellence in Quantum Technology, QTF; Zhipei Sun Group; Shenzhen University; University of Chinese Academy of Sciences; University of Cambridge
    We demonstrate a high-peak-power femtosecond fiber laser system based on single-mode holmium (Ho)-doped fibers. 833 fs, 27.7 MHz pulses at 2083.4 nm generated in a passively mode-locked Ho fiber laser are amplified and compressed to near transform-limited 172 fs, 7.2 nJ pulses with 24.3 kW peak power. We achieve this performance level by using the soliton effect and high-order soliton compression. To the best of our knowledge, this is the first demonstration of sub-200 fs pulses, with peak power exceeding 10 kW from a Ho-doped single-mode fiber laser system without using bulk optics compressors.
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    High-Power Femtosecond Pulse Generation from an All-Fiber Er-Doped Chirped Pulse Amplification System
    (IEEE, 2020-04) Wei, Rongling; Wang, Mengmeng; Zhu, Zexiu; Lai, Weiyu; Yan, Peiguang; Ruan, Shuangchen; Wang, Jinzhang; Sun, Zhipei; Hasan, Tawfique; Department of Electronics and Nanoengineering; Centre of Excellence in Quantum Technology, QTF; Zhipei Sun Group; Shenzhen University; University of Cambridge
    We demonstrate a compact all-fiber Er-doped chirped pulse amplification (CPA) system that can produce ∼344 fs pulses with an average power of up to 1.02 W and a repetition rate of 40.6 MHz at 1.56 μm (corresponding to an energy of 25.1 nJ). The pulse compressor in the CPA system is based on a hollow core photonic crystal fiber which is directly butt-coupled to the silica fiber. A mismatched negative third-order dispersion is used to compensate the accumulated nonlinear phase shift in the amplification process for the first time, resulting in the generation of sub-400 fs pulses from an all-fiber Watt-level Er-doped CPA system. Our system architecture offers a possibility for ultrashort pulse generation from all-fiber Er-doped CPA lasers.
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    Soliton Mode-Locked Large-Mode-Area Tm-Doped Fiber Oscillator
    (IEEE, 2020-01-15) Zhu, Zexiu; Sun, Zhipei; Zhang, Hui; Wang, Mengmeng; Wei, Rongling; Zheng, Zhijian; Yan, Peiguang; Ruan, Shuangchen; Wang, Jinzhang; Hasan, Tawfique; Department of Electronics and Nanoengineering; Department of Applied Physics; Centre of Excellence in Quantum Technology, QTF; Zhipei Sun Group; Shenzhen University; University of Chinese Academy of Sciences; University of Cambridge
    We report a passively mode-locked fiber oscillator based on thulium-doped large-mode-area (LMA) fiber. Reliably mode-locking soliton operation can be readily achieved after the suppression of the higher-order modes by using mode field adapters in combination with coiling fiber method. The laser delivers 600-fs level pulses at ~\mu \text{m}$ with an average power of up to 243 mW and a repetition rate of 53.7 MHz. The output corresponds to a maximum pulse energy of 4.5 nJ, >5 times larger than that of a similar homemade mode-locked Tm laser with the LMA fibers replaced by single mode fibers, coinciding with theoretical prediction. The successful demonstration of our soliton mode-locked LMA fiber laser at ~\mu \text{m}$ offers another strategy for high performance ultrafast fiber sources at mid-infrared region.