All-fiber system at 1750 nm delivering 35 fs 230 kW peak power pulses

Ultra-short (<70 fs) pulses in the short-wavelength infrared (>1.55 µm) are very attractive for many applications such as three-photon microscopy¹, frequency metrology², or high harmonic generation³. Solitonic self-compression is an attractive effect for this purpose as compression to sub-50 fs pulses can be achieved without the need for external compressing optics, directly out of an optical fiber. Self-compression at high energy was demonstrated around 2 µm in all-solid⁴ or gas-filled⁵ hollow-core-PCFs. However, the latter demonstrations were restricted to Tm emission band in order to reach the soliton self-compression effect in low-nonlinearity media. In this communication, we present a compact monolithic all-fiber source of ultrashort (35 fs) pulses emitting outside conventional lasing bands, from 1.65 to 2 µm based on Raman-induced soliton self-frequency shift (SSFS) and soliton self-compression (SSC).