Speaker
Description
The post-compression of femto-second pulsed lasers utilizing spectral broadening in solid and gas is now commonly used for obtaining few-cycle pulses. In the long-wavelength infrared (LWIR) region, solid targets such as ZnSe, and KRS-5 has been utilized*. I performed spectral broadening experiment with a 3-mm-thick KRS-5 plate at the FEL wavelength of 11 micro-m to see what would happen when the spectral broadening technique utilized for FEL pulses whose micro-pulse repetition rate was 29.75 MHz. I could observe near infrared components (1.5-2.6 micro-m), which induced by the spectral broadening in the KRS-5 plate, using a InGaAs detector. When the KRS-5 plate was placed before the focusing point of the focus point of the LWIR-FEL, strong multi-pulse effects were observed due to nonlinear absorption in the KRS-5 plate. The strong multi-pulse effects and nonlinear absorption can be understood by the accumulated carrier induced by multi-photon excitation of previous micro-pulses. This work was supported by MEXT Q-LEAP (JPMXS0118070271).
Footnotes
S. Qu et al., Opt. Lett. 45, pp.2175-2178 (2020).
*H. Zen et al., Opt. Express 31, pp.40928-40936 (2023).
Funding Agency
Funding Agency: MEXT Q-LEAP (JPMXS0118070271)
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