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16 February 2011 Adaptive shaping of complex pulsed nondiffracting light fields
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Proceedings Volume 7950, Complex Light and Optical Forces V; 795009 (2011)
Event: SPIE OPTO, 2011, San Francisco, California, United States
For an extended wavefront analysis, structured materials processing, optical information technologies, or superresolving microscopy with ultrashort pulses, more flexible and robust techniques of beam shaping are required. Non-Gaussian fringe-free Bessel beams ("needle beams") can be generated with programmable phase maps of phase-only displays. Such beams behave propagation invariant over relatively extended regions with respect to their characteristic spatio-temporal signatures. Here, we extend the concept of needle pulses towards other types of nondiffracting fields including significantly more complex ones. It is shown that also nondiffracting light slices, tubular beams or pixellated images can be composed from simple nondiffracting constituents of higher degree of symmetry. With arrangements of multiple small phase axicons programmed into liquid-crystal-on-silicon spatial light modulators, a large variety of non-conventional nondiffracting beams of even highly asymmetrically partitions can be achieved with widely propagation invariant spectral and temporal properties. Modified Shack-Hartmann sensors with integrated temporal sensitivity, advanced types of multichannel autocorrelators and adaptive materials processing with variable focal spots are proposed.
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M. Bock, S. K. Das, and R. Grunwald "Adaptive shaping of complex pulsed nondiffracting light fields", Proc. SPIE 7950, Complex Light and Optical Forces V, 795009 (16 February 2011);

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