Abstract
We report a multimicrojoule, ultrabroadband midinfrared optical parametric amplifier based on a GaSe nonlinear crystal pumped at . The generated idler pulse has a flat spectrum spanning from 4.5 to 13.3 μm at and 4.2 to 16 μm in the full spectral range, with a central wavelength of 8.8 μm. The proposed scheme supports a subcycle Fourier-transform-limited pulse width. A ()-dimensional numerical simulation is employed to reproduce the obtained idler spectrum. To our best knowledge, this is the broadest spectrum ever obtained by optical parametric amplifiers in this spectral region. The idler pulse energy is with a conversion efficiency of from the pump to the idler pulse.
© 2019 Optical Society of America
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