Large phase shift of spatial soliton in lead glass by cross-phase modulation in pump-signal geometry

TL;DR

This paper demonstrates a significant phase shift in a bi-color spatial soliton pair within lead glass, achieved through cross-phase modulation, with experimental results closely matching theoretical predictions.

Contribution

It presents the first experimental observation of large phase shifts in bi-color spatial solitons in lead glass using pump-signal geometry, confirming theoretical models.

Findings

Achieved a π phase shift of the signal beam with a 14 mW increase in pump power.

Experimental results closely match theoretical predictions.

Demonstrated synchronous propagation of pump and signal beams in lead glass.

Abstract

We investigate the large phase shifts of the bi-color spatial soliton pair in a cylindrical lead glass rod. The theoretical study suggests a synchronous propagation of a strong pump beam and a weak signal beam under the required initial condition. We experimentally obtain a $\pi$ phase shift of the signal beam by changing the power of the pump beam by about 14 mW around the soliton critical power, which agrees qualitatively with our theoretical result. The ratio of the phase shift rate of the signal soliton to that of the pump soliton shows a close match to the theoretical estimation.