Bright squeezed-vacuum source with 1.1 spatial mode

Opt Lett. 2014 Apr 15;39(8):2403-6. doi: 10.1364/OL.39.002403.

Abstract

Bright squeezed vacuum, a macroscopic nonclassical state of light, can be obtained at the output of a strongly pumped nonseeded traveling-wave optical parametric amplifier (OPA). By constructing the OPA of two consecutive crystals separated by a large distance, we make the squeezed vacuum spatially single-mode without a significant decrease in the brightness or squeezing.