High-Precision Interferometric Measurements of Gas Refractive Index Using Homodyne Detection.

ABSTRACT: Balanced homodyne detection, which offers advantages that include low noise and strong anti-interference capabilities, is commonly used as a detection method in quantum metrology. In this article, we propose application of the balanced homodyne detection technique to the gas sensing and measurement field. By constructing a Mach-Zehnder interferometer based on balanced homodyne detection, we realize high-precision measurement of the refractive index of air. The device exhibits interference efficiency of 99% and a common-mode rejection ratio of 40 dB, thus enabling dynamic monitoring of optical phase changes. Under conditions that include a stabilized temperature of 25 °C, atmospheric pressure of 100.08 kPa, and relative humidity of 30%, the refractive index of air was measured experimentall

SUBMITTER: Miao Y 

PROVIDER: S-EPMC12158383 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature