Real-time Control of Polarization in Ultra-short Pulse Laser Micro-processing
The use of a fast-response, transmissive, ferroelectric liquid-crystal device for real-time control of the polarization direction of a femtosecond laser beam, and the benefits on various aspects of ultra-short pulse micro-processing, are discussed. Several configurations have been used for driving the polarization in real time. Following successful testing of these applications, real-time polarization control has emerged as a flexible toolbox for the laser processing engineer. Microscopic investigation of the produced features revealed the significant improvement in process quality.