High gain fiber-solid hybrid double-passing end-pumped Nd: YVO4 picosecond amplifier with high beam quality

doi:10.1088/1674-1056/ab8218

中国物理B ›› 2020, Vol. 29 ›› Issue (5): 54207-054207.doi: 10.1088/1674-1056/ab8218

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality

Xueyan Dong(董雪岩), Pingxue Li(李平雪), Shun Li(李舜), Dongsheng Wang(王东生)

Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

收稿日期:2020-02-13 修回日期:2020-03-05 出版日期:2020-05-05 发布日期:2020-05-05
通讯作者: Pingxue Li E-mail:pxli@bjut.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61675009 and 61325021) and Key Program of Beijing Municipal Natural Science Foundation, China (Grant No. KZ201910005006).

High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality

Xueyan Dong(董雪岩), Pingxue Li(李平雪), Shun Li(李舜), Dongsheng Wang(王东生)

Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

Received:2020-02-13 Revised:2020-03-05 Online:2020-05-05 Published:2020-05-05
Contact: Pingxue Li E-mail:pxli@bjut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61675009 and 61325021) and Key Program of Beijing Municipal Natural Science Foundation, China (Grant No. KZ201910005006).

摘要/Abstract

摘要：

We propose a fiber-solid hybrid system which consists of a semiconductor saturable absorber mirror (SESAM) mode-locked fiber seed with a pulse width of 10.2 ps and a repetition rate of 18.9 MHz, a two-level fiber pre-amplifier and a double-passing end-pumped Nd:YVO₄ amplifier. In the solid-state amplifier, to enhance the gain and the extraction efficiency, a specially designed structure in which the seed light passes through the gain medium four times and makes full use of population inversion is used as the double-passing amplifier. Besides, the beam filling factor (the ratio of the seed light diameter to the pump light diameter) and the thermal lens effect of the double-passing amplifier are considered and its optical-to-optical conversion efficiency is further improved. To preserve the beam quality of the double-passing amplifier, a new method of spherical-aberration self-compensation based on the principles of geometrical optics is used and discussed. Our system achieves a maximum average power of 9.5 W at the pump power of 28 W, corresponding to an optical-to-optical efficiency of 27%. And the beam quality factor M² reaches 1.3 at the maximum output power.

关键词: picosecond fiber-solid hybrid, double-passing amplifier, high beam quality, spherical-aberration self-compensation

Abstract:

Key words: picosecond fiber-solid hybrid, double-passing amplifier, high beam quality, spherical-aberration self-compensation

中图分类号: (Fiber lasers)

42.55.Wd

42.55.Px (Semiconductor lasers; laser diodes) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.55.Xi (Diode-pumped lasers)

董雪岩, 李平雪, 李舜, 王东生. High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality[J]. 中国物理B, 2020, 29(5): 54207-054207.

Xueyan Dong(董雪岩), Pingxue Li(李平雪), Shun Li(李舜), Dongsheng Wang(王东生). High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality[J]. Chin. Phys. B, 2020, 29(5): 54207-054207.

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High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality

High gain fiber-solid hybrid double-passing end-pumped Nd: YVO₄ picosecond amplifier with high beam quality

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