Broadband amplitude squeezing in a periodically poled KTiOPO_4 waveguide

TL;DR

This paper reports the achievement of -2.2 dB broadband amplitude squeezing at 1064 nm in a PPKTP waveguide, marking the highest squeezing level in KTP waveguides, limited by propagation losses.

Contribution

It demonstrates the first large-scale broadband amplitude squeezing in a PPKTP waveguide, highlighting potential for further improvements with lower-loss waveguides.

Findings

Achieved -2.2 dB broadband amplitude squeezing.

Largest squeezing reported in KTP waveguides to date.

Limited by propagation losses, with potential for enhancement.

Abstract

We generated -2.2 dB of broadband amplitude squeezing at 1064 nm in a periodically poled KTiOPO_4 (PPKTP) waveguide, by coupling of the fundamental and second harmonic continuous-wave fields. This is the largest amount of squeezing obtained to date in a KTP waveguide, limited by propagation losses. This result paves the way for further improvements by use of lower-loss buried ion-exchanged waveguides.