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

doi:10.1088/1674-1056/ab8218

Abstract

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.

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

Received: 13 February 2020
Revised: 05 March 2020
Accepted manuscript online:

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

Fund:

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).

Corresponding Authors: Pingxue Li
E-mail: pxli@bjut.edu.cn

Cite this article:

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 2020 Chin. Phys. B 29 054207

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

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