Wavelength Spacing Tunable, Multiwavelength Q-switched Fiber Laser Mode-locked by Graphene Oxide

TL;DR

This paper presents a fiber laser that can be tuned to generate multiple wavelengths with adjustable spacing, using graphene oxide, suitable for various optical applications.

Contribution

A novel wavelength spacing tunable, multiwavelength Q-switched mode-locked fiber laser based on graphene oxide with precise control via pump power.

Findings

Wavelength spacing tunable from ~0.001 nm to 0.145 nm.

Wavelength spacing controlled by pump power with less than 10 mW variation.

Potential for low-loss, tunable optical sources for diverse applications.

Abstract

We demonstrate a wavelength spacing tunable, multiwavelength Q-switched mode-locked fiber laser (QML) based on a fiber taper deposited with graphene oxide. The operation of the laser can be understood in terms of the formation of bunches of QMLs which possess small temporal intervals, and multiwavelength spectra are generated due to the Fourier transformation. We find that the temporal spacing of the QMLs is highly sensitive to the pump power, and as a result, the wavelength spacing can be easily tuned by varying the pump power. Our experimental laser provides a wavelength spacing tuning range from ~0.001 nm to 0.145 nm with a pump power variation less than 10 mW. The laser could be developed into a low lost wavelength spacing tunable optical source for a wide range of applications, such as spectroscopy, microwave/terahertz signal generation, optical metrology, optical communications and sensing.