The novel phenomenon of induced focusing predicted to occur in a self-defocusing non-linear medium is reported experimentally. A 10 ps pump pulse optically induces a refractive index spatial profile in a GaAs/AlGaAs planar waveguide which results in induced focusing of a subsequent weak copropagating probe pulse for appropriate relative spatial positions. With pump and probe pulses separated by one beam waist, the probe output peak intensity is increased by 40%. These observations are consistent with two-transverse-dimension beam-propagation computations with the carrier-density-dependent optical non-linearity modelled by the plasma theory.
|Original language||English (US)|
|Number of pages||6|
|Journal||Quantum Optics: Journal of the European Optical Society Part B|
|State||Published - 1992|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics