Youjian Song

Tianjin University

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Minglie Hu

Tianjin University

174

Chingyue Wang

Tianjin University

Lu Chai

Xi'an Jiaotong University

Haochen Tian

University of Electro-Communications

Bowen Liu

Tianjin University

Defeng Zou

Southern University of Science and Technology

Jungwon Kim

Pusan National University

Jintao Fan

Tianjin University

Qingyue Wang

Nanjing University

Ruoyu Liao

China Academy of Engineering Physics

Cooperative Institutions

Samsung (South Korea)

235

Chinese Academy of Sciences

151

Tianjin University

139

University of Chinese Academy of Sciences

Beijing University of Posts and Telecommunications

Peking University

Shanghai Jiao Tong University

Zhejiang University

Korea Advanced Institute of Science and Technology

Huazhong University of Science and Technology

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Femtosecond Mamyshev oscillator with 10-MW-level peak power

Optica (2019)

Wu Liu Ruoyu Liao Jun Zhao Jiahua Cui Youjian Song

Ultrafast fiber lasers exhibit high broadband gain per pass, superior thermo-optical properties, and excellent beam quality, making them very suitable for practical use. For simplicity and efficiency, advanced mode-locked oscillator designs which can compete with the amplifier systems are always favorable. Here, we demonstrate a high-peak-power Mamyshev oscillator based on single-polarization, large-mode-area photonic crystal fibers. Using properly arranged filters, the fiber oscillator directly emits pulses with 9 W average power at 8 MHz repetition rate, corresponding to a single-pulse energy exceeding 1 μJ. The pulses are dechirped to 41 fs outside the cavity, leading to a record oscillator peak power as high as 13 MW. With such unprecedented performance, the proposed single-stage oscillator should be very attractive for various applications.

10.1364/optica.6.000194

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Citations (131)

中空フォトニックバンドギャップに基づくフェムト秒レーザパルス圧縮【JST・京大機械翻訳】

Chinese Journal of Lasers (2009)

Bowen Liu Qingyue Wang Xu Bo Yi Li Youjian Song

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High-power wavelength-tunable photonic-crystal-fiber-based oscillator-amplifier-frequency-shifter femtosecond laser system and its applications for material microprocessing

Laser Physics Letters (2008)

Bingguo LIU Minglie Hu Xiaohui Fang Yuanyuan Wu Youjian Song

A high-power wavelength-tunable femtosecond fiber laser source is developed based on photonic-crystal fiber technology. Laser oscillator and amplifier stages in this system employ diode-pumped ytterbium-doped single-polarization large-mode-area photonic-crystal fibers in a stretcher-free configuration, delivering laser pulses with an average power of 10.4 W, a pulse width of 52 fs, and a peak power of 4 MW at a repetition rate of 50 MHz after pulse compression. Nonlinear transformation of such laser pulses in a highly nonlinear photonic-crystal fiber yields light pulses smoothly tunable within the range of wavelengths from 1.0 to 1.4 μm and allows the generation of supercontinuum stretching from 450 to at least 1750 nm. We report experiments on silicon microprocessing and chromium nanofilm patterning at a high repetition rate, demonstrating the potential of the developed fiber-laser source for fast micromachining, microfabrication, and microprocessing.

Supercontinuum

10.1002/lapl.200810084

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Citations (105)

Sideband-free dispersion-managed Yb-doped mode-locked fiber laser with Gires–Tournois interferometer mirrors

Chinese Optics Letters (2023)

Aoran Feng Bowen Liu Dongyu Yan Genyu Bi Youjian Song

High-order dispersion introduced by Gires–Tournois interferometer mirrors usually causes spectral sidebands in the near-zero dispersion region of mode-locked fiber lasers. Here, we demonstrate a sideband-free Yb-doped mode-locked fiber laser with dispersion-compensating Gires–Tournois interferometer mirrors. Both the simulation and the experiment demonstrate that the wavelength and energy of the sidebands can be tuned by changing the transmission coefficient of the output mirror, the pump power, and the ratio of the net cavity dispersion to the net third-order dispersion in the cavity. By optimizing these three parameters, the laser can generate a sideband-free, Gaussian-shaped spectrum with a 13.56-nm bandwidth at -0.0232 ps2 net cavity dispersion, which corresponds to a 153-fs pulse duration.

10.3788/col202321.061401

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A ranging system based on dual-comb femtosecond laser ranging technology

wen dai Dezhao Yang Youjian Song Tingyu Liu Guanyu Liu

Ranging

Dose-ranging study

10.1117/12.3039929

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Timing Jitter of the Dual-Comb Mode-Locked Laser: A Quantum Origin and the Ultimate Effect on High-Speed Time- and Frequency-Domain Metrology

IEEE Journal of Selected Topics in Quantum Electronics (2018)

Haosen Shi Youjian Song Ting Li Chingyue Wang Xin Zhao

We study on the timing jitter characteristics of a passively mode-locked dual-wavelength dual-comb Er-fiber laser that generates two femtosecond optical frequency combs with an offset repetition rate in a shared cavity. The relative timing jitter is characterized directly in the time domain with tens of attoseconds precision by utilizing the intrinsic asynchronous optical sampling process between the two laser beams. This sensitive measurement reveals an amplified spontaneous emission (ASE) noise dominated random walk of the relative pulse timing, which has not been observed before in a dual-comb laser. The quantum-limited relative timing jitter behavior shows that the common-mode noise suppression based on a shared cavity does not apply to quantum noise. We further conduct a time-of-flight ranging experiment and a Fourier-transform spectroscopy simulation based on this dual-comb laser, showing that the quantum-limited relative timing jitter sets an ultimate limit on the reachable performance in time- and frequency-domain dual-comb applications particularly when the high acquisition rate is desired.

Mode-Locking

10.1109/jstqe.2018.2810381

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Citations (24)

Controllable high-speed rotated femtosecond cylindrical vector beam based on optical heterodyne interference

Optics Express (2022)

Yuwei Zhao Jintao Fan Youjian Song Minglie Hu

Structured light beams that possess unique polarization distribution could offer a new degree of freedom for a variety of applications, and hence its flexible polarization manipulation is necessary. Here we experimentally report a heterodyne interference-based method for generating femtosecond cylindrical vector beam (CVB) with high-speed controllable rotated polarization states. The femtosecond CVBs are created through the superposition of two optical vortices with opposite handedness. The use of two acoustic-optical modulators (AOMs) with frequency differences allows to achieve polarization rotation in a hopping-free scheme at on demand speed. Up to 1 MHz of the rotation frequency is demonstrated by visualizing the fast rotation events through a fast-frame-rate CCD camera. Moreover, we show our method can be readily extended to produce higher order CVBs with more complex rotated polarization distributions. Such a simple yet versatile femtosecond polarization-controlled laser system has the capability to act as a nonlinear trapping platform, thus opening tremendous potential opportunities in the fields of micromachining, nanofabrication, and so force.

10.1364/oe.460710

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Citations (1)

Ultra-flat supercontinuum generated from high-power, picosecond telecommunication fiber laser source

Applied Optics (2016)

Ruoyu Liao Youjian Song Xiaokang Zhou Lu Chai Chingyue Wang

An ultra-flat, high-power supercontinuum generated from a picosecond telecommunication fiber laser was presented. The pulse from a carbon nanotube mode-locked oscillator was amplified using an Er-Yb codoped fiber amplifier. The output of the system achieved an average power of 2.7 W, with the center wavelength at 1564 nm and a FWHM of 6 nm in the spectral domain. By passing this amplified high-power pulse through a 4.6 m highly nonlinear photonic crystal fiber, an ultra-flat supercontinuum spanning 1600-2180 nm is generated. And the average power of the supercontinuum achieves 1 W.

Supercontinuum

Picosecond

10.1364/ao.55.009384

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Pulse-shaping dynamics controlled by four structural parameters in an all-normal-dispersion mode-locked fiber laser

Journal of the Optical Society of America B (2009)

Chunmei Ouyang Lu Chai Hui Zhao Minglie Hu Youjian Song

The characteristics of pulse-shaping dynamics based on four structural parameters in a fiber laser without any dispersion compensation are studied numerically. The simulations show that the four structural parameters, i.e., the location and bandwidth of the spectral filter and the location and output coupling ratio of the output coupler, are crucial for achieving high pulse energy and high pulse peak power in all-normal-dispersion fiber lasers. To obtain high pulse energy and high pulse peak power, optimal positions of the spectral filter and the output coupler inside the cavity are proposed.

10.1364/josab.26.001875

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Citations (8)

LabVIEW based stability evaluation for femtosecond laser light source on distance measurement

Ningxia Engineering Technology (2012)

Youjian Song

In order to evaluate the light source stability of femtosecond lasers distance measurement,the system collects the repeat frequency data of the light source using frequency meter,Allan Variance is calculated through LabVIEW program.The analysis shows that the key factors to the laser repetition frequency stability is phase modulation and random walk frequency modulation.

Allan variance

Modulation (music)

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