CC BY 4.0 UnportedBock, MartinGrafenstein, Lorenz vonGriebner, UweElsaesser, Thomas2023-06-052023-06-052018https://oa.tib.eu/renate/handle/123456789/12373http://dx.doi.org/10.34657/11405Spectral pulse shaping in a high-intensity midwave-infrared (MWIR) optical parametric chirped pulse amplifier (OPCPA) operating at 1 kHz repetition rate is reported. We successfully apply a MWIR spatial light modulator (SLM) for the generation of ultrashort idler pulses at 5 μm wavelength. Only bulk optics and active phase control of the 3.5 μm signal pulses via the SLM are employed for generating compressed idler pulses with a duration of 80 fs. The 80-fs pulse duration corresponds to less than five optical cycles at the central wavelength of 5.0 μm. The pulse energy amounts to 1.0 mJ, which translates into a peak power of 10 GW. The generated pulse parameters represent record values for high-intensity MWIR OPCPAs.enghttps://creativecommons.org/licenses/by/4.0/530620600Chirp modulationInfrared radiationLight modulationLight modulatorsOptical pulse shapingParametric amplifiersPulse repetition rateSpectrum analyzersArticle