Numerical modelling and optimization of actively Q-switched waveguide lasers based on liquid crystal transducers

Xinyue Lei*, Christoph Wieschendorf, Josiah Firth, Francois Ladouceur, Alex Fuerbach, Leonardo Silvestri

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have recently experimentally demonstrated that a novel liquid crystal-based photonic transducer for sensing systems could be utilized as an active Q-switch in a miniaturised and integrated waveguide laser system. In this paper, we now present a comprehensive numerical modelling study of this novel laser architecture by deriving a set of equations that accurately describe the temporal optical response of the liquid crystal cell as a function of applied voltage and by combining this theoretical model with laser-rate equations. We validate the accuracy of this model by comparing the results with previously obtained data and find them in excellent agreement. This enables us to predict that under realistic conditions and moderate pump power levels of 500 mW, the laser system should be capable of generating peak power levels in excess of 1.1 kW with pulse widths of about 20 ns, corresponding to pulse energies > 20 µJ. We believe that such a low-cost and ultra-compact laser source could find applications ranging from trace gas sensing and LIDAR to material processing.

Original languageEnglish
Pages (from-to)8777-8791
Number of pages15
JournalOptics Express
Volume27
Issue number6
DOIs
Publication statusPublished - 18 Mar 2019

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