AI Article Synopsis
- The paper introduces a model that predicts how thermal stress affects birefringence in high energy, high repetition rate Yb:YAG lasers by analyzing factors like geometry, pump power, and cooling parameters.
- Experimental results from a DiPOLE 100 J, 10 Hz laser amplifier show that the model's predictions align well with what was observed.
- The study highlights that the level of depolarisation—ranging from 5% to 40%—is influenced by the input polarisation state, suggesting that using waveplates in multipass amplifiers can significantly minimize depolarisation losses.
Article 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 single-pass 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.
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| http://dx.doi.org/10.1364/OE.417152 | DOI Listing |
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