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Chin. Phys. B, 2020, Vol. 29(11): 114206    DOI: 10.1088/1674-1056/abb3e9
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

All-fiberized very-large-mode-area Yb-doped fiber based high-peak-power narrow-linewidth nanosecond amplifier with tunable pulse width and repetition rate

Min Yang(杨敏), Ping-Xue Li(李平雪), Dong-Sheng Wang(王东生), Ke-Xin Yu(于可新), Xue-Yan Dong(董雪岩), Ting-Ting Wang(王婷婷), Chuan-Fei Yao(姚传飞), and Wei-Xin Yang(杨卫鑫)
Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
Abstract  

We demonstrate an all-fiberized narrow-linewidth nanosecond amplifier with high peak power, tunable pulse width, and repetition rate. A fiber-coupled narrow-linewidth laser diode operating at 1064.1 nm is employed as the seed source, which is gain-switched to generate nanosecond pulses with tunable pulse widths of 1–200 ns and tunable repetition rates of 10 Hz–100 kHz. By utilizing a very-large-mode-area Yb-doped fiber with a core diameter of 50 μm in the power amplifier, thresholds of the stimulated Brillouin scattering at different pulse widths and repetition rates are increased. The maximum average power reaches 30.8 W at the pulse width of 4 ns and a repetition rate of 100 kHz, corresponding to an optical-to-optical conversion efficiency of ∼55.2%. Pulse energy and peak power are calculated to be 0.2 mJ and 50 kW, respectively, which are limited by stimulated Brillouin scattering. The 3-dB spectral linewidth remains around 0.05 nm during the power scaling process. The stimulated Brillouin scattering limited output powers at different pulse widths and repetition rates are investigated. Peak power of 47.5 kW (0.19 mJ) is obtained for the 4 ns pulses at a repetition rate of 50 kHz, which is nearly the same as that of 4 ns pulses at 100 kHz. When the pulse width of the seed source is increased to 8 ns, peak powers/pulse energies are decreased to 19.6 kW/0.11 mJ and 13.3 kW/0.08 mJ at repetition rates of 50 kHz and 100 kHz, respectively.

Keywords:  nanosecond      all-fiber amplifier      very-large mode area      tunable pulse width and repetition rate  
Received:  10 April 2020      Revised:  26 July 2020      Published:  03 November 2020
Fund: the National Natural Science Foundation of China (Grant No. 61675009) and the Beijing Natural Science Foundation Program, China, and Scientific Research Key Program of Beijing Municipal Education Commission, China (Grant No. KZ201910005006).
Corresponding Authors:  Corresponding author. E-mail: pxli@bjut.edu.cn第一通讯作者   

Cite this article: 

Min Yang(杨敏), Ping-Xue Li(李平雪), Dong-Sheng Wang(王东生), Ke-Xin Yu(于可新), Xue-Yan Dong(董雪岩), Ting-Ting Wang(王婷婷), Chuan-Fei Yao(姚传飞), and Wei-Xin Yang(杨卫鑫) All-fiberized very-large-mode-area Yb-doped fiber based high-peak-power narrow-linewidth nanosecond amplifier with tunable pulse width and repetition rate 2020 Chin. Phys. B 29 114206

Fig. 1.  

Schematic diagram of the narrow-linewidth nanosecond fiber MOPA. LD, laser diode; BPF, band-pass filter; WDM, wavelength division multiplexer; YDF, Yb-doped fiber; FBG: fiber Bragg grating; OC, optical coupler; ISO, isolator; DCF, double-clad fiber; CMS, cladding mode stripper.

Fig. 2.  

Spectrum of the backward propagating pulses.

Fig. 3.  

Backward propagating pulses at 1.4 W (a) and 17.8 W (b).

Fig. 4.  

Output average powers of the main amplifier at different pulse widths and repetition rates.

Fig. 5.  

The M2 factor at the maximum output power of 30.8 W.

Fig. 6.  

Seed pulses and amplified pulses of the main amplifier seeded by pulses of 4 ns/50 kHz (a), 4 ns/100 kHz (b), 8 ns/50 kHz (c), 8 ns/100 kHz (d). Insets: pulse sequences at each pulse width and repetition rate.

Fig. 7.  

Output spectrums of the main amplifier seeded by 4 ns pulses with the PRF of 100 kHz. (a) Spectral distribution at 30.8 W, inset: enlarged spectrum; (b) evolutions of spectrum.

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