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Spatial-mode demultiplexing for enhanced intensity and distance measurement
Optics Express
|October 20, 2023
Summary
Spatial-mode demultiplexing (SPADE) enhances precision measurements for bright, incoherent sources. This technique offers improved signal-to-noise ratios over direct imaging for sub-wavelength separations.
Area of Science:
- Optics
- Quantum Optics
- Metrology
Background:
- Spatial-mode demultiplexing (SPADE) is a technique for measuring transverse separation between incoherent sources.
- Previous research suggested SPADE's potential in the photon-counting regime.
Purpose of the Study:
- To explore SPADE for precision measurements with bright, incoherent sources.
- To analyze SPADE's performance in estimating source intensity distribution moments.
Main Methods:
- Theoretical analysis of SPADE for extended incoherent sources.
- Experimental validation using two bright, point-like sources.
Main Results:
- SPADE theory predicts significant signal-to-noise ratio (SNR) improvement over direct imaging for sub-wavelength separations.
- Experimental demonstration confirmed SNR enhancement for estimating transverse separation and relative intensity.
Conclusions:
- SPADE is a valuable tool for high-precision measurements of bright, incoherent sources.
- The technique offers superior performance compared to direct imaging in the sub-wavelength regime.
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