Single-shot 25-frame burst imaging of ultrafast phase transition of Ge2Sb2Te5 with a sub-picosecond resolution

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Authors: Suzuki, Takakazu; Hida, Ryohei; Yamaguchi, Yuki; Nakagawa, Keiichi; Saiki, Toshiharu & Kannari, Fumihiko
Abstract:

“We captured ultrafast two-dimensional (2D)-burst images of the crystalline-to-amorphous phase transition of Ge2Sb2Te5. These transitions were induced by a femtosecond laser pulse, and the images, with a sub-picosecond temporal resolution, were acquired on a single-shot basis through the change in local optical transmittance. We employed a 2D-burst imaging method of sequentially timed all-optical mapping photography utilizing spectral filtering (SF-STAMP). The SF-STAMP system consists of a 25-beam-generating diffractive optical element, a band-pass filter, and two Fourier transform lenses. We used a frequency-chirped broadband pulse and achieved 25-frame burst imaging with an interval of 133 fs in a single-shot time window of 3.2 ps.”

Open Access

Publication: Applied Physics Express
Issue/Year: Applied Physics Express, Volume 10; Number 9; Pages 092502; 2017
DOI: 10.7567/apex.10.092502
Link: https://doi.org/10.7567/apex.10.092502

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