High-energy, diode-pumped, solid-state laser technology, such as DiPOLE, is key for a wide range of applications including the realisation of petawatt-class chirped pulse amplification systems operating at an unprecedented 10Hz repetition rate. In particular, optimisation of the non-linear frequency conversion process from 1030nm to 515nm is required for pumping titanium sapphire, a common gain material. This process is polarisation-sensitive and suffers from losses due to depolarisation, an effect that causes the polarisation state of the beam to vary across the beam aperture. A summary of the methods used for measuring and controlling polarisation in DiPOLE systems will be presented.
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