Temporal self-compression and self-frequency shift of sub-microjoule pulses at 8 MHz repetition rate

TL;DR

This paper demonstrates a compact, high-repetition-rate laser system that produces ultrashort pulses with tunable wavelengths by leveraging soliton dynamics and self-frequency shifting in gas-filled hollow-core fibers.

Contribution

It introduces a turnkey laser setup capable of generating few-femtosecond pulses at 8 MHz with very low pump energies, utilizing innovative soliton self-frequency shift techniques.

Findings

Achieved 22 fs pulse duration

Operates at 8 MHz repetition rate

Tunable wavelength range from 1100 nm to 1474 nm

Abstract

We combine soliton dynamics in gas-filled hollow-core photonic crystal fibers with a state-of-the-art fiber laser to realize a turn-key system producing few-fs pulses at 8 MHz repetition rate at pump energies as low as 220 nJ. Furthermore, by exploiting the soliton self-frequency shift in a second hydrogen-filled hollow-core fiber, we efficiently generate pulses as short as 22 fs, continuously tunable from 1100 nm to 1474 nm.