Affiliation:
1. Liaocheng University
2. Chinese Academy of Sciences
3. Shandong University of Science and Technology
4. Yunnan University
5. Shandong University
Abstract
In this Letter, using a Yb,Gd:CaSrF2 co-doping mixed crystal, an ultra-low threshold and efficient Kerr-lens mode-locked femtosecond oscillator is realized with a mode-locking threshold as low as 150 mW. With a 200-mW pump power, the shortest pulses are obtained with a pulse duration of 57 fs. A maximum mode-locked output power of 185 mW is observed under a 500-mW pump power, corresponding to an optical-to-optical efficiency of up to 37%. To the best of our knowledge, the 150-mW threshold is the lowest pump power to realize Kerr-lens mode-locking operation in Yb-doped bulk lasers. Furthermore, an optical efficiency of 37% is the highest efficiency in Yb-doped fluoride bulk lasers to date. Our results provide a new basis for high-efficiency and low-threshold Yb-doped ultrafast bulk lasers.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Introduction and Cultivation Plan of Youth Innovation Talents for Universities of Shandong Province
Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China
Subject
Atomic and Molecular Physics, and Optics
Cited by
5 articles.
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