Real-time control of polarisation in ultra-short-pulse laser micro-machining

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.

[1]  Philippe M. Fauchet,et al.  Growth of spontaneous periodic surface structures on solids during laser illumination , 1982 .

[2]  A. Ostendorf,et al.  Polarization effects in ultrashort-pulse laser drilling , 1999 .

[3]  Michael J Withford,et al.  Pulse-to-pulse polarization-switching method for high-repetition-rate lasers. , 2007, Applied optics.

[4]  Friedrich Dausinger,et al.  Precise drilling of steel with ultrashort pulsed solid state lasers , 2003, Other Conferences.

[5]  I. Ursu,et al.  High‐intensity laser irradiation of metallic surfaces covered by periodic structures , 1987 .

[6]  V. Niziev,et al.  Influence of beam polarization on laser cutting efficiency , 1999 .

[7]  Michael D. Perry,et al.  Material effects in ultra-short pulse laser drilling of metals , 1999 .

[8]  B. Krauskopf,et al.  Proc of SPIE , 2003 .

[10]  Andreas Ostendorf,et al.  Development of an industrial femtosecond laser micromachining system , 2002, SPIE LASE.

[11]  Andreas Ruf,et al.  Fundamental aspects in machining of metals with short and ultrashort laser pulses , 2004, SPIE LASE.

[12]  Friedrich Dausinger,et al.  High precision deep drilling with ultrashort pulses , 2003, International Symposium on Laser Precision Microfabrication.

[13]  Stuart Edwardson,et al.  Fast parallel diffractive multi-beam femtosecond laser surface micro-structuring , 2009 .

[14]  Hans Kurt Tönshoff,et al.  Microdrilling of metals with ultrashort laser pulses , 2000 .

[15]  Friedrich Dausinger,et al.  Influences on hole quality in high precision drilling of steel with ultra-short pulsed laser systems , 2002 .

[16]  V. Konov,et al.  Drilling of Metals , 2004 .

[17]  Sergei V. Govorkov,et al.  Microdrilling and micromachining with diode-pumped solid-state lasers , 2004 .

[18]  Friedrich Dausinger,et al.  Energy Coupling Efficiency in Laser Surface Treatment , 1993 .

[19]  Friedrich Dausinger,et al.  Machining of metals with ultrashort laser pulses: from fundamental investigations to industrial applications , 2005, International Symposium on High Power Laser Systems and Applications.

[20]  R. Vajtai,et al.  Periodic nanostructures observed by STM on vanadium surface preilluminated with a cw Yag-laser , 1992 .