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Updated: Jun 4, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Relative intensity squeezing by four-wave mixing with loss: an analytic model and experimental diagnostic
M Jasperse1, L D Turner, R E Scholten
1ARC Centre of Excellence for Coherent X-Ray Science, University of Melbourne, VIC 3010, Australia. martijn.jasperse@monash.edu
Abstract:
Four-wave mixing near resonance in an atomic vapor can produce relative intensity squeezed light suitable for precision measurements beyond the shot-noise limit. We develop an analytic distributed gain/loss model to describe the competition of mixing and absorption through the non-linear medium. Using a novel matrix calculus, we present closed-form expressions for the degree of relative intensity squeezing produced by this system. We use these theoretical results to analyze experimentally measured squeezing from a 85Rb vapor and demonstrate the analytic model's utility as an experimental diagnostic.
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