Intra-Cavity Second Harmonic Generation in Fiber Lasers by a WSe2 Monolayer

Christian Neureuter

WSe2 flakes on a fiber-optic cable.

WSe2 flakes on a fiber-optic cable

Undergraduate Student Project

Introduction

Typically, a laser's cavity is very sensitive to any changes, so who would think it would be possible to place something inside a fiber laser cavity and it would still work?

I'm Christian Neureuter and I am a senior physics major at the University at Buffalo. I have been working in the optics lab of Dr. Tim Thomay for a year, where I have had the opportunity to assist in research into non-linear optical properties of semiconductor materials. I have worked closely with Dr. Thomay and one of his PhD students, Muhammed Kilinc on their research into the optical properties of atomically thin TMDs. I assisted Muhammed in running the experiments and we have all been working on writing a manuscript for the research.

Current methods for generating second harmonics involve bulk crystals and free-space lasers. We wanted to find out whether the high non-linear response of monolayer TMDs could be successfully incorporated into a robust, integrated fiber laser system.

Abstract

We demonstrate intra-cavity Second Harmonics Generation (SHG) in a passively mode-locked ps fiber laser from a monolayer Transition Metal Dichalcogenide (TMD). This shows the feasibility of utilizing the ultra-high non-linearity of non-centro-symmetric monolayers, in an integrated fiber laser system.

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