Q-switched EDF LASER Cavity using ITO as Saturable Absorber

Bilal Nizmani,Bhawani Shankar Chowdhary,Ghulam Fizza,Faisal Ahmed Memon,Suleiman Wadi Harun

doi:10.33317/ssurj.314

Abstract

In this work, we have experimentally reported Q-switched pulse generation by indium tin oxide as a saturable absorber. First the glass slide was placed in electron beam deposition chamber and indium tin oxide layer was coated over the glass slide. Then the indium tin oxide was exfoliated from the glass slide, over the fiber ferrules in erbium doped fiber laser cavity. The Q-switched laser operated at center wavelength of 1562.6 nm. The repetition rate and pulse width were obtained to be 48.31-64.52 kHz and 5.65-4.23 µs, respectively.

Highlights

The lasers emitting pulses have gained attention in a plethora of applications including material processing and telecommunication [1]
Owing to the mirror alignment issues in SESAMs, many other potential materials emerged as new Saturable Absorber (SA) which included Graphene, Black-Phosphorus, Transition Metal Di-Chalcogenides (TMDs), Topology Insulators (TIs), organic materials, metals, metal carbides, and metal oxides [6,7,8,9,10,11,12,13]
All these SAs could achieve stable mode-locked and Q-switched lasers. They suffer from few drawbacks such as Graphene and TMDs have a low modulation depth, metals such as silver oxidize and Black-Phosphorus is a hydrophilic material that is not considered as environment-friendly SA [14]

Summary

INTRODUCTION

The lasers emitting pulses have gained attention in a plethora of applications including material processing and telecommunication [1]. Owing to the mirror alignment issues in SESAMs, many other potential materials emerged as new SAs which included Graphene, Black-Phosphorus, Transition Metal Di-Chalcogenides (TMDs), Topology Insulators (TIs), organic materials, metals, metal carbides, and metal oxides [6,7,8,9,10,11,12,13]. All these SAs could achieve stable mode-locked and Q-switched lasers. The Q-switching pulse was stable with a pumping power of 63.41-112.86 mW, and the smallest pulses width was obtained as 4.23 μs

PREPARATION AND CHARACTERIZATION OF SATURABLE ABSORBER

EXPERIMENTAL SETUP

EXPERIMENTAL RESULT

CONCLUSION