Songtao Du

Shanghai Institute of Optics and Fine Mechanics

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Qihong Lou

Shanghai Institute of Optics and Fine Mechanics

Jing He

Mianyang Normal University

Jun Zhou

Chinese Academy of Sciences

Zhaokun Wang

Hebei University of Technology

Jun Zhou

Institute of Mountain Hazards and Environment

Ziwei Wang

North China University of Technology

Yunrong Wei

Shanghai Institute of Optics and Fine Mechanics

Weibiao Chen

University of Chinese Academy of Sciences

Ziwei Wang

Tsinghua University

Qihong Lou

Shanghai Institute of Optics and Fine Mechanics

Cooperative Institutions

Chinese Academy of Sciences

Shanghai Institute of Optics and Fine Mechanics

University of Chinese Academy of Sciences

China Jiliang University

Nanchang University

Qufu Normal University

Shandong University

Academia Sinica

Beijing University of Posts and Telecommunications

Huazhong University of Science and Technology

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通过光纤端面磨布儒斯特角实现线偏振输出的掺镱光纤激光器

Chinese Optics Letters (2010)

Xia Liu Songtao Du Jun Zhou Jingxing Dong Yunrong Wei

A new method to obtain linear polarization operation by Brewster's angle-polished fiber end is demonstrated.By using the special polarization operation technique together with introducing a narrow-linewidth fiber grating into the laser cavity, a cladding-pumped linear polarization and single-transverse-mode (M 2 < 1.1) Yb-doped fiber laser with narrow linewidth whose full-width at half-maximm (FWHM) is less than 0.2 nm, is obtained in a simple configuration.The output power is up to 10 W which is continuouswave output at 1085 nm, and the slope efficiency is 63% with respect to the coupled pump power and 75% with respect to the absorbed pump power, respectively.The measured 21-dB polarization extinction ratio does not degrade with the output power.The simplicity of such an approach is highly beneficial for a number of applications, including the use of a fiber laser for the nonlinear wavelength conversion (especially for the intracavity frequency doubling) and for the coherent and spectral beam combination.

10.3788/col20100802.0184

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Citations (7)

Wavelength-Tunable Rectangular Pulses Generated from All-Fiber Mode-Locked Laser Based on Semiconductor Saturable Absorber Mirror

Chinese Physics Letters (2016)

Zhao-Kum Wang Feng Zou Ziwei Wang Songtao Du Jun Zhou

The wavelength-tunable rectangular mode-locking operation is demonstrated in an all-fiber laser based on semiconductor saturable absorber mirror. As the dissipative soliton resonance signature, the pulse duration varies from 580 ps to 2.1 ns as a function of the increasing pump power. Correspondingly, the maximum pulse energy is 9.11 nJ. Moreover, it is found that the wavelength tunable operation with a range of approximately 10 nm could be obtained by properly adjusting the polarization controllers. The characteristics of the rectangular pulses at different wavelengths are similar to each other. The demonstration of the wavelength tunable rectangular pulses would be beneficial to some applications for many fields such as spectroscopy and sensing research.

Saturable absorption

Pulse duration

10.1088/0256-307x/33/9/094206

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Tunable and Switchable Narrow Bandwidth Semiconductor-Saturable Absorber Mirror Mode-Locked Yb-Doped Fiber Laser Delivering Different Pulse Widths

Chinese Physics Letters (2016)

Zhaokun Wang Feng Zou Ziwei Wang Songtao Du Jun Zhou

The wavelength-tunable and switchable narrow bandwidth mode-locking operation is demonstrated in an all fiber laser based on semiconductor-saturable absorber mirror (SESAM). Two narrow-band fiber Bragg gratings centered at 1029.9 nm and 1032 nm respectively with a polarization controller inserted between them are used to realize the wavelength switchable between 1029.9 nm and 1032 nm. The laser delivers different pulse widths of 7.5 ps for 1030 nm and 20 ps for 1032 nm. The maximum output power for both could reach ~6.5 mW at single pulse operation. The output wavelength could be tuned to about 0.9 nm intervals ranging from 1030.2 nm to 1031.1 nm and from 1032.15 nm to 1033.7 nm with the temperature change of the fiber Bragg grating, respectively.

Fiber Bragg Grating

Saturable absorption

Polarization controller

10.1088/0256-307x/33/3/034202

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Citations (5)

The improvement of output pulse shape in nanosecond pulse fiber amplifier

Xia Liu Songtao Du Yuhao Xue Jun Zhou Bing He

The change of pulse shape in a MOFPA system was experimentally demonstrated. Through optimized the pulse shape, the amplifier can provide 59-W 1064 nm laser with pulse duration of 22.7 ns at 50 kHz repetition rate.

Nanosecond

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Fiber amplifier

10.1109/cleopr.2009.5292638

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High power single transverse mode operation of a tapered large-mode-area fiber laser

Optics Communications (2007)

Libo Li Qihong Lou Jun Zhou Jingxing Dong Yunrong Wei

Slope efficiency

10.1016/j.optcom.2007.10.024

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Citations (31)

20‐W average power, high repetition rate, nanosecond pulse with diffraction limit from an all‐fiber MOPA system

Microwave and Optical Technology Letters (2008)

Songtao Du Jun Zhou Fangpei Zhang Yutong Feng Qihong Lou

Abstract In this article, we report an all‐fiber master oscillator power amplifier (MOPA) system, which can provide high repetition rate and nanosecond pulse with diffraction‐limit. The system was constructed using a (2 + 1) × 1 multimode combiner. The Q‐Switched, LD pumped Nd:YVO 4 solid‐state laser was used as master oscillator. The 976‐nm fiber‐coupled module is used as pump source. A 10‐m long China‐made Yb 3+ ‐doped D‐shape double‐clad large‐mode‐area fiber was used as amplifier fiber. The MOPA produced as much as 20‐W average power with nanosecond pulse and near diffraction limited. The pulse duration is maintained at about 15 ns during 50–175 kHz. The system employs a simple and compact architecture and is therefore suitable for the use in practical applications such as scientific and military airborne LIDAR and imaging. Based on this system, the amplification performances of the all‐fiber amplifier is investigated. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2546–2549, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23770

Nanosecond

Pulse repetition frequency

10.1002/mop.23770

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Frequency doubling of narrow-linewidth pulsed fiber laser

Chinese Optics Letters (2012)

Wendi Wu Wendi Wu Tingqi Ren Jun Zhou Songtao Du Xia Liu Xia Liu

A pulsed master oscillator power amplifier system is constructed using a double-cladding polarized Ybdoped fiber and an all-fiber Q-switched narrow-linewidth pulsed laser used as seed laser.This system has a high repetition rate and provides a nanosecond pulsed laser with a narrow linewidth and linear polarization.Moreover, it generates amplified radiation with up to 14 W of average power, narrow linewidth (full-width at half-maximum is smaller than 0.12 nm), linear polarization at 1 080-nm wavelength, repetition rate of 51 kHz, and pulse duration of approximately 50 ns.Based on this pulsed amplified radiation, 3.5 W of green laser, with an optical-to-optical efficiency of 27.3%, is obtained via single-pass frequency doubling using a noncritical phase matching KTP crystal.

Laser linewidth

Nanosecond

10.3788/col201210.050604

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Compact All-Fiber 102 W Picosecond MOPA Laser with a Narrow Spectral Linewidth

Chinese Physics Letters (2011)

Wendi Wu Tingqi Ren Jun Zhou Songtao Du Xijia Gu

We report an all-fiber-based master oscillator power amplifier picosecond ytterbium-doped fiber laser with an average power of 102 W and a spectral line width of 0.1 nm. The seed source is a compact single mode passively mode-locked fiber laser with an average power of 2.48 W. Finally, the laser maximum average output power of 102 W picosecond pulses is realized by a direct all-fiber amplifier structure in one stage. The experiment enables the optical-to-optical conversion efficiency to reach 61.4%, with the central wavelength of 1063.7nm. A significant feature of this experiment is the spectral line width of 0.1nm. The spectrum has no broadening or nonlinear effects when the pump is strengthened.

Laser linewidth

Picosecond

Spectral width

10.1088/0256-307x/28/11/114206

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Citations (5)

Millijoule-class Pulse Energy, High Peak Power Q-switching Large-Mode-Area Photonic Crystal Fiber Laser at 978nm

International Photonics and Optoelectronics Meetings (2012)

Songtao Du Jing He Ziwei Wang Wendi Wu Qihong Lou

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text S. Du, J. He, Z. Wang, W. Wu, Q. Lou, J. Zhou, and Y. Wei, "Millijoule-class Pulse Energy, High Peak Power Q-switching Large-Mode-Area Photonic Crystal Fiber Laser at 978nm," in International Photonics and Optoelectronics Meetings, OSA Technical Digest (online) (Optica Publishing Group, 2012), paper MTh5A.5. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Mode (computer interface)

10.1364/ltst.2012.mth5a.5

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Short-length large-mode-area photonic crystal fiber laser operating at 978 nm

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2013)

Jing He Ziwei Wang Wendi Wu Songtao Du Qihong Lou

The laser performance of a short-length Yb-doped rod-type photonic crystal fiber (PCF) laser is studied experimentally both in the three-level scheme and quasi-four-level scheme in this contribution. In the free oscillation mode, the rod-type PCF laser produce 13.6 W output power on the quasi-four-level system with center wavelength of 1030 nm. The laser operating on the three-level system is obtained with the introduction of specialized feedback around the 976 nm radiation. Up to 7 W output power is generated with wavelength centered in 978 nm.

10.1117/12.2010950

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Citations (1)