Clean few-cycle blue soliton self-compressed pulses generation in hollow-core fibers

TL;DR

This paper demonstrates a novel hollow-core fiber scheme for generating 4.4 femtosecond blue pulses through self-compression, combining broadband frequency doubling and multi-stage dispersion management, advancing ultrafast blue pulse technology.

Contribution

It introduces a multi-stage hollow-core fiber approach for efficient, dispersion-managed blue soliton self-compression, extending ultrashort pulse generation into the blue spectral region.

Findings

Achieved 4.4 fs blue soliton self-compressed pulses

Enhanced efficiency and dispersion control in pulse generation

Eliminated need for dispersion compensation components

Abstract

Blue pulses with few-cycle temporal durations hold significant value in attosecond science and ultrafast spectroscopy. In this work, we combine efficient broadband frequency doubling, multiplate continuum (MPC) post-compression and blue soliton self-compression in hollow-core fibers (HCF), experimentally demonstrating HCF-based 4.4 fs clean blue soliton self-compressed pulse. Our scheme offers three-fold advantages: (1) prevention of excessive dispersion accumulation by gradually suppressing dispersion through multi-stage design; (2) enhanced overall efficiency for self-compression-based ultrashort blue pulse generation; and (3) elimination of dispersion compensation components for the final spectral broadening stage compared to post-compression schemes. This work extends HCF-based self-compression soliton to the blue spectral region and paves the way for generating energetic ultrashort blue pulses.