AI Article Synopsis
- Optical phase-insensitive heterodyne detection is important for precise spatial and temporal measurements, but it suffers from sensitivity limits due to shot noise in both the signal and image bands.
- Researchers propose using squeezed light to eliminate shot noise from these bands, addressing the known 3-dB noise penalty.
- Experimental results confirm that this method reduces shot noise from both bands simultaneously, potentially enhancing the sensitivity of measurements beyond current capabilities.
Article Abstract
Optical phase-insensitive heterodyne (beat-note) detection, which measures the relative phase of two beams at different frequencies through their interference, is a key sensing technology for various spatial/temporal measurements, such as frequency measurements in optical frequency combs. However, its sensitivity is limited not only by shot noise from the signal frequency band but also by the extra shot noise from an image band, known as the 3-dB noise penalty. Here, we propose a method to remove shot noise from all these bands using squeezed light. We also demonstrate beyond-3-dB noise reduction experimentally, confirming that our method actually reduces shot noise from both the signal and extra bands simultaneously. Our work should boost the sensitivity of various spatial/temporal measurements beyond the current limitations.
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| http://dx.doi.org/10.1364/OE.498691 | DOI Listing |
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