Modelling and measurement of thermal stress-induced depolarisation in high energy, high repetition rate diode-pumped Yb:YAG lasers

Mariastefania De Vido, Paul D. Mason, Michael Fitton, Rupert W. Eardley, Gary Quinn, Danielle Clarke, Klaus Ertel, Thomas J. Butcher, P. Jonathan Phillips, Saumyabrata Banerjee, Jodie Smith, Jacob Spear, Chris Edwards, John L. Collier

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
11 Downloads (Pure)

Abstract

In this paper, we present a model to predict thermal stress-induced birefringence in high energy, high repetition rate diode-pumped Yb:YAG lasers. The model calculates thermal depolarisation as a function of gain medium geometry, pump power, cooling parameters, and input polarisation state. We show that model predictions are in good agreement with experimental observations carried out on a DiPOLE 100 J, 10 Hz laser amplifier. We show that singlepass depolarisation strongly depends on input polarisation state and pumping parameters. In the absence of any depolarisation compensation scheme, depolarisation varies over a range between 5% and 40%. The strong dependence of thermal stress-induced depolarisation on input polarisation indicates that, in the case of multipass amplifiers, the use of waveplates after every pass can reduce depolarisation losses significantly. We expect that this study will assist in the design and optimisation of Yb:YAG lasers.

Original languageEnglish
Pages (from-to)5607-5623
Number of pages17
JournalOptics Express
Volume29
Issue number4
Early online date5 Feb 2021
DOIs
Publication statusPublished - 15 Feb 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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