We demonstrate optical beam auto-focusing without the need of a focusing lens or nonlinearity. Radial Airy beams with inward and outward accelerations are used and an abrupt transition between Airy and Bessel behavior is observed.
© 2011 OSA
(050.1970) Diffraction and gratings : Diffractive optics
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
P. Zhang, J. Prakash, Z. Zhang, Y. Hu, N. Efremidis, V. Kajorndejnukul, D. Christodoulides, and Z. Chen, "Observation of auto-focusing radially symmetric Airy beams," in CLEO:2011 - Laser Applications to Photonic Applications, OSA Technical Digest (CD) (Optical Society of America, 2011), paper QThS7.
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