O.J. Allegre ·W. Perrie · K. Bauchert · D. Liu · S.P. Edwardson · G. Dearden · K.G.Watkins
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 micromachining, 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.