Phys. Rev. Lett. 83, 4756–4759 (1999)Experimental Observation of Linear and Nonlinear Optical Bloch OscillationsReceived 1 July 1999; published in the issue dated 6 December 1999 We experimentally demonstrate the occurrence of optical Bloch oscillations in a waveguide array with linearly growing effective index of the individual guides. We monitored the output profiles for varying propagation lengths and observed a periodic transverse motion of the field and a complete recovery of the initial excitation. The action of the focusing nonlinearity leads to a loss of recovery, symmetry breaking, and power-induced beam spreading. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.4756
DOI:
10.1103/PhysRevLett.83.4756
PACS:
42.82.Et, 42.65.Sf, 42.65.Wi
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