Tapered amplifier laser with frequency-shifted feedback

TL;DR

This paper introduces a frequency-shifted feedback laser using a tapered amplifier, producing a broadband, coherent light source with a wide spectrum and long coherence time, suitable for metrology applications.

Contribution

It demonstrates a novel FSF laser based on a tapered amplifier with broad spectral output and comb generation, enhancing practical utility in precision measurement.

Findings

Spectral width up to 370 GHz

Output power of 280 mW at 780 nm

Coherence time of 2.3 microseconds

Abstract

We present a frequency-shifted feedback (FSF) laser based on a tapered amplifier. The laser operates as a coherent broadband source with up to 370GHz spectral width and 2.3us coherence time. If the FSF laser is seeded by a continuous-wave laser a frequency comb spanning the output spectrum appears in addition to the broadband emission. The laser has an output power of 280mW and a center wavelength of 780nm. The ease and flexibility of use of tapered amplifiers makes our FSF laser attractive for a wide range of applications, especially in metrology.