Dynamic cavity effect in Topological Insulator Bi2Te3 based Passive Q-switched Solid State Laser

TL;DR

This paper investigates the dynamic cavity effect in a Bi2Te3-based passive Q-switched solid state laser, revealing how the material's saturation properties influence laser stability and transition to continuous wave operation.

Contribution

It introduces the use of hydrothermally exfoliated Bi2Te3 as a sensitive saturable absorber and explains the transition from Q-switching to continuous wave state through modulation instability analysis.

Findings

Bi2Te3 serves as an effective saturable absorber at low saturation intensities.

Transition from Q-switched to CW state occurs with increased pump power.

The transition is explained by modulation instability spectrum of laser rate equations.

Abstract

Dynamic cavity effect of a Topological Insulator Bi2Te3 based Passive Q-switched (QS) solid state laser was investigated. With a saturation intensity as low as a few kW, Bi2Te3 processed by hydrothermal exfoliation serves a sensitive saturable absorber to initiate Q-switching. Without material damage, a transition from QS state to CW state was observed when the pumping strength increases which was explained by the modulation instability spectrum of laser rate equation.