Real-time control of polarisation in ultra-short-pulse laser micro-machining
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- Allegre, O.J., Perrie, W., Bauchert, K. et al. Appl. Phys. A (2012) 107: 445. doi:10.1007/s00339-012-6761-5
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The use of a fast-response, transmissive, ferroelectric liquid-crystal device for real-time control of the polarisation direction of a femtosecond laser beam, and the benefits for various aspects of ultra-short pulse micro-machining, are discussed. Several configurations have been used to drive the polarisation in real-time. Our microscopic investigations of the resulting features revealed significant improvements in process efficiency and quality, compared to static linear and circular polarisations. Following our successful micro-machining tests, real-time polarisation control could emerge as a powerful tool in laser engineering.