Affiliation:
1. Xi’an Institute of Optics and Precision Mechanics
2. School of Electronics and Information Engineering Xi’an Jiaotong University
3. University of Chinese Academy of Sciences
Abstract
Ultrafast fiber lasers combining high peak power and excellent beam quality in the 1-µm wavelength range have been explored to applications in industry, medicine and fundamental science. Here, we report generation of a high-energy sub 300 fs polarization maintaining fiber chirped pulse amplification (CPA) system by using a Yb-doped large mode area tapered polarization maintaining (PM) optical fiber with the core/cladding diameters of 35/250 µm at the thin end and 56/400 µm at the thick end. The taper fiber design features a confined core for selective gain amplification and multi-layer cladding for enhanced suppression of higher order modes. In this regime, we have demonstrated 266 fs pulse amplification with peak power of up to 132 MW at a repetition rate of 2 MHz and high beam quality with measured M2 value of 1.1∼1.3. To the best of our knowledge, it is the highest peak power reported in such tapered Yb-doped fiber (T-YDF) amplifier in the femtosecond regime. This work indicates the great potential of the T-YDF to realize further power scaling, high laser efficiency, and excellent beam quality in high-power femtosecond fiber lasers.
Funder
West Light Foundation of the Chinese Academy of Sciences
Research Fund for Young Star of Science and Technology in Shaanxi Province
Key Project of “Double Chain” Integration of Shaanxi Province
National Natural Science Foundation of China
Youth Innovation Promotion Association of the Chinese Academy of Sciences
CAS-SAFEA International Partnership Program for Creative Research Teams
Subject
Atomic and Molecular Physics, and Optics
Cited by
4 articles.
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