Few-cycle THz pulse generation in DSTMS driven by an 8.3-MHz amplified Mamyshev oscillator

This is the authors' abstract. We don't add key points for this paper.

Mamyshev oscillators are an emerging class of ultrafast fiber lasers that support exceptionally broadband spectra and few-femtosecond pulse durations, making them well-suited for nonlinear frequency conversion. Despite this potential, THz generation with Mamyshev oscillators has not been demonstrated to date. In this work, we report the generation of THz few-cycle pulses at an 8.3 MHz repetition rate via optical rectification of a 31-fs pulse duration, 1-W average power amplified Mamyshev oscillator in a 190-µm-thick DSTMS organic crystal. We measure a THz average power of 40 µW and a spectral bandwidth of 4 THz. To further investigate the advantages of combining the Mamyshev oscillator and organic crystals for THz generation at a multi-MHz repetition rate, we compare the THz pulses with those generated using a conventional inorganic 500 µm-thick GaP crystal, obtaining comparable bandwidth, but 20 times lower power with respect to DSTMS.