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Broadband mid-infrared (MIR) molecular spectroscopy demands a bright andbroadband light source in the molecular fingerprint region. To this end,intra-pulse difference frequency generation (IDFG) has shown excellentproperties among various techniques. However, previous IDFG systems have mainlyused unconventional long-wavelength 2-${\mu}$m ultrashort pulsed lasers. A fewsystems have been demonstrated with 1-${\mu}$m lasers, but they use bulky100-W-class high-power Yb thin-disk lasers. In this work, we demonstrate asimple and robust approach of 1-${\mu}$m-pumped broadband IDFG with aconventional mode-locked Yb-doped fiber laser. We first generate 3.3-W, 12.1-fsultrashort pulses at 50 MHz by a simple combination of spectral broadening witha short single-mode fiber and pulse compression with chirped mirrors. Then, weuse them for pumping a thin orientation-patterned gallium phosphide (OP-GaP)crystal, generating 1.2-mW broadband MIR pulses with the -20-dB bandwidth of480 cm$^{-1}$ in the fingerprint region (760-1240 cm$^{-1}$, 8.1-13.1${\mu}$m). The 1-${\mu}$m-based IDFG system allows for simultaneous generationof ultrashort pulses in the ultraviolet and visible regions, enabling, forexample, 100-MHz-level high-repetition-rate vibrational sum-frequencygeneration spectroscopy or pump-probe spectroscopy.

A simple approach of broadband mid-infrared pulse generation with a mode-locked Yb-doped fiber laser