Multistage smoothing based multistep pulse compressor for ultrahigh peak power lasers

A 100-PW compressor based on single-pass single-grating pair

“…Figure 3(h) shows the FTL temporal profiles at the same three positions, 0, 217 and 434 mm, and the FWHM pulse durations are approximately 14.3, 16.5 and 37.3 fs, respectively. The spectral clipping that causes modulation occurs at less than half the peak intensity away from the top hat region [13,20] , as shown in Figure 3(c).…”

“…In the previous work [13] , an AFGC was used as the main compressor to compensate for the spectral chirp and induce a suitably small spatial chirp to smooth the laser beam simultaneously. This is because an AFGC is equal to a symmetric four-grating compressor and an SSGP compressor with a short grating-pair distance.…”

“…According to previous work, the spatial chirp induced beam-smoothing effect is proportional to the induced spatial chirp width [11][12][13] , which can be expressed as follows:…”

“…In this method, the pulse-energy-limitation problem in the grating-based compressor is transferred to the spatiotemporal properties of the input/output laser beams [11] . As an improvement of the typical MPC, a multistage-smoothing MPC (MS-MPC) based on an asymmetric four-grating compressor (AFGC) was also proposed to achieve ultrahigh peak-power output and safe operation simultaneously [12,13] .…”