Experimental observation of spectral Bloch oscillations.
We report on the first, to our knowledge, experimental observation of spectral Bloch oscillations in an optical fiber employing the interaction between a probe signal and a traveling-wave periodic potential. The spectrum of weak probe pulses is shown to oscillate on account of their group-velocity mismatch to the periodic field. The behavior of a cw probe spectrum reveals the actual discrete nature of the effect. Recurrences of the spectrum after one and two Bloch periods are demonstrated.
Bersch
Christoph
C
Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1/Building 24, 91058 Erlangen, Germany. christoph.bersch@mpl.mpg.de
Onishchukov
Georgy
G
Peschel
Ulf
U