Fig. 1. (a) Schematic diagram of experimental configuration for STS-UFP. (b) Generation of pulse train using the spectrum shuttle method. (c) Locations of replicated images with α and θ values of 56.3° and 33.7°, respectively. (d) Cropping of images using the entrance slit of a streak camera. BS1, BS2, beam splitters; G1, G2, gratings; M1–M6, mirrors; DS, dynamic scene; OB, objective; L1, lens; LP, lens pair; F, filter; HP, half-wave plate; S, slit; PBS, polarized beam splitter; QP1, QP2, quarter-wave plates; SC, streak camera.

Fig. 2. Schematic diagram of the image acquisition in STS-UFP.

Fig. 3. Characterization of STS-UFP system. (a) Processed image of the USAF 1951 target. (b) Intensity distribution curves along the horizontal and vertical lines on the 7-6 pattern in (a). (c) Temporal characteristics of the pulse train consisting of 12 sub-pulses. (d) Temporal characteristics of the pulse train consisting of 16 sub-pulses.

Fig. 4. (a) Experimental configuration for observing femtosecond laser-induced plasma and shockwave expansion in water using STS-UFP. (b) Processed images of plasma generation and shock wave expansion in water induced by 400 nm femtosecond laser pulses. (c) Expansion curves for the plasma and shockwave.

Fig. 5. (a) Experimental configuration for observing femtosecond laser ablation of biological tissue using STS-UFP. (b) Processed images of femtosecond laser ablation of onion epidermis. (c) Time-dependent transmittance in the ablated region. (d) Expansion curve for the ablated area.

Fig. 6. (a) Experimental configuration for observing femtosecond laser-induced shockwave on a silicon surface using STS-UFP. (b) Processed images of femtosecond laser-induced shockwave. (c) Extracted shockwave propagation distances in the horizontal and oblique 45° directions. The propagation distance in the oblique 45° direction is fitted using the Sedov–Taylor theory.