400nm ultra-broadband gratings for near-single-cycle 100 Petawatt lasers

Yuxing Han, Zhaoyang Li (), Yibin Zhang, Fanyu Kong, Hongchao Cao, Yunxia Jin (), Yuxin Leng, Ruxin Li and Jianda Shao ()
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Yuxing Han: Chinese Academy of Sciences
Zhaoyang Li: Chinese Academy of Sciences
Yibin Zhang: Chinese Academy of Sciences
Fanyu Kong: Chinese Academy of Sciences
Hongchao Cao: Chinese Academy of Sciences
Yunxia Jin: Chinese Academy of Sciences
Yuxin Leng: Chinese Academy of Sciences
Ruxin Li: Chinese Academy of Sciences
Jianda Shao: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Compressing high-energy laser pulses to a single-cycle and realizing the “λ3 laser concept”, where λ is the wavelength of the laser, will break the current limitation of super-scale projects and contribute to the future 100-petawatt and even Exawatt lasers. Here, we have realized ultra-broadband gold gratings, core optics in the chirped pulse amplification, in the 750–1150 nm spectral range with a > 90% −1 order diffraction efficiency for near single-cycle pulse stretching and compression. The grating is also compatible with azimuthal angles from −15° to 15°, making it possible to design a three-dimensional compressor. In developing and manufacturing processes, a crucial grating profile with large base width and sharp ridge is carefully optimized and controlled to dramatically broaden the high diffraction efficiency bandwidth from the current 100–200 nm to over 400 nm. This work has removed a key obstacle to achieving the near single-cycle 100-PW lasers in the future.

Date: 2023
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DOI: 10.1038/s41467-023-39164-3

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