Figure 1
From: High-order harmonics generation in the laser-induced lead-free perovskites-containing plasmas
The schematic view of HHG setup. The uncompressed laser pulse was directed by a mirror (M) to the compressor comprising of the compressing grating (CG), vertical retroreflector (VRR), and horizontal retroreflector (HRR). The compressed probing pulse (PP) was focused by a focusing lens (FL1) inside the vacuum chamber (VAC) comprising the target and XUV spectrometer. The focused pulses propagated through the 0.2 mm thick BBO crystal to generate second harmonic (SH) for the two-color pump of plasma. Inset shows the relative positions of the SH (blue curve) and PP (red curve) pulses and their polarizations. The heating pulses (HP) were focused by a focusing lens (FL2) to produce the laser plasma on the surface of the target (TG). The generated harmonics and fundamental radiation propagated through the slit (SL) and entered the XUV spectrometer comprising of the cylindrical mirror (CM), flat-field grating (FFG), and micro-channel plate (MCP). Bottom panels: The spectra of (a) chirp-free 35 fs pulses and positively chirped 70 and 130 fs pulses and (b) chirp-free 35 fs pulses and negatively chirped 70 and 130 fs pulses. PD, pulse duration.
