Supercontinuum generation and carrier envelope offset frequency measurement in a tapered single-mode fiber

TL;DR

This paper demonstrates supercontinuum generation spanning over an octave using a tapered single-mode fiber with femtosecond Yb fiber laser pulses, and successfully measures the carrier envelope offset frequency with high signal-to-noise ratio.

Contribution

It introduces a method for broad supercontinuum generation and precise carrier envelope offset frequency measurement in a tapered fiber setup.

Findings

Achieved supercontinuum spectrum from 550 to 1400 nm with 1.3 W output power.

Measured carrier envelope offset frequency with nearly 30 dB SNR.

Coupling efficiency of up to 60% in the fiber setup.

Abstract

We report supercontinuum generation by launching femtosecond Yb fiber laser pulses into a tapered single-mode fiber of 3 um core diameter. A spectrum of more than one octave, from 550 to 1400 nm, has been obtained with an output power of 1.3 W at a repetition rate of 250 MHz, corresponding to a coupling efficiency of up to 60%. By using a typical f-2f interferometer, the carrier envelope offset frequency was measured and found to have a signal-to-noise ratio of nearly 30 dB.