Spectral shaping of an OPCPA preamplifier for a sub-20-fs multi-PW laser
작성자 관리자 작성일 2019-03-22
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최근수정일 2019-03-22, IP 172.25******

We developed an OPCPA preamplifier with an actively shaped output spectrum to obtain a sub-20-fs-duration pulse for a 4-PW laser. The active spectral shaping was facilitated by controlling the temporal profile of a pump pulse in the OPCPA preamplifier. By optimizing the output spectrum of the OPCPA to compensate for the gain-depletion effect in the 4-PW laser, a final laser pulse with a broad spectrum of 101-nm in width (FWHM), resulting in a short pulse duration of 17 fs, was achieved. 

[Amplified spectra measured after each of the amplification stages]