High Power Laser Science and Engineering, 2018, 6 (2): 02000e19, Published Online: Jul. 4, 2018  

Efficient high harmonics generation by enhancement cavity driven with a post-compressed FCPA laser at 10 MHz

Author Affiliations
1 The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
2 Department of Physics, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Abstract
Efficient high harmonics generation (HHG) was demonstrated at 10 MHz repetition rate with an external femtosecond enhancement cavity, seeded by a ${\sim}70~\text{fs}$ post-compressed 10 MHz fiber chirped pulse amplifier (FCPA) laser. Operation lasting over 30 min with 0.1 mW outcoupled power at 149 nm was demonstrated. It was found that shorter pulse was beneficial for alleviating the nonlinear plasma effect and improving the efficiency of HHG. Low finesse cavity can relax the plasma nonlinearity clamped intra-cavity power and improve the cavity-locking stability. The pulse duration is expected to be below 100 fs for both 1040 nm and 149 nm outputs, making it ideal for applications such as time-resolved photoemission spectroscopy.

Zhigang Zhao, Akira Ozawa, Makoto Kuwata-Gonokami, Yohei Kobayashi. Efficient high harmonics generation by enhancement cavity driven with a post-compressed FCPA laser at 10 MHz[J]. High Power Laser Science and Engineering, 2018, 6(2): 02000e19.

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