Few-cycle, carrier–envelope-phase-stable laser pulses from a compact supercontinuum source

Abstract

We report on a few-cycle, carrier–envelope-phase-stable laser source based on supercontinuum generation driven by an amplified Er:fiber-based system. Laser pulses from an Er:fiber oscillator are amplified, and these amplified pulses generate a stable supercontinuum in a highly nonlinear optical fiber. The short- and long-wavelength tails of this continuum are used in an $f$-to-$2f$ interferometer to stabilize the carrier–envelope phase (CEP) of the Er:fiber oscillator via an acousto-optic modulator. Compressing the central part of the continuum, we generate a train of CEP-stabilized laser pulses with a central wavelength of 1170 nm, duration of 9.1 fs ($\sim 2.3$ optical cycles), and repetition rate of 78.4 MHz. Characterizing the CEP stability of our output pulse train with an out-of-loop $f$-to-$2f$ interferometer, we find a phase jitter of only 157.4 mrad when integrating the radiofrequency spectrum from 5 mHz to 5 MHz.

© 2019 Optical Society of America

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