Advanced LD pumped 3.3 J/1 Hz nanosecond Nd:glass preamplifier for SG-II upgrade laser facility

Author:

Guo Jiangtao1,Wang Jiangfeng1,Lu Xinghua1,Huang Wenfa1,Huang Dajie1,Wang Xiaochao1,Wei Hui1,Fan Wei1ORCID,Li Xuechun1

Affiliation:

1. Shanghai Institute of Optics and Fine Mechanics

Abstract

We demonstrate a laser-diode-pumped multipass Nd:glass laser amplifier with a range of advanced characteristics. The amplifier exhibits high extraction efficiency, enables arbitrary shaping of spatial beam intensity, and effectively suppresses frequency modulation to amplitude modulation conversion. Our approach achieves excellent beam quality via thermal lensing and thermal depolarization compensation. When a 1.82 mJ/5 ns laser pulse was injected into the amplifier, the output energy reached up to 3.3 J with a repetition rate of 1 Hz at a central wavelength of 1053.3 nm. The near-field modulation of the amplified output beam was below 1.2, and the far-field focusing ability of the beam was 90% at 2.9 times the diffraction limit. This laser amplifier system holds potential for integration as a preamplifier within the SG-II upgrade high power laser facility.

Funder

Strategic Priority Research Program of the Chinese Academy of Sciences

Program of Shanghai Academic Research Leader

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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