Spatially single-mode source of bright squeezed vacuum

TL;DR

This paper demonstrates a method to generate bright squeezed vacuum that is spatially single-mode using two separated crystals in an optical parametric amplifier, maintaining high brightness and squeezing levels.

Contribution

It introduces a novel configuration of two separated crystals in an OPA to produce spatially single-mode bright squeezed vacuum without sacrificing brightness.

Findings

Achieved spatially single-mode bright squeezed vacuum.

Maintained high brightness and squeezing levels.

Validated the effectiveness of the two-crystal configuration.

Abstract

Bright squeezed vacuum, a macroscopic nonclassical state of light, can be obtained at the output of a strongly pumped non-seeded 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.