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Mixing partially coherent fields with gaussian irradiance profiles; optimization criteria.
Applied Optics
|January 16, 2010
Summary
This study details signal-to-noise ratio (SNR) in partially coherent beam mixing. Optimal local oscillator beam size and coherence area are derived for enhanced SNR.
Area of Science:
- Optics and Photonics
- Signal Processing
Background:
- Signal-to-noise ratio (SNR) is critical in optical systems employing beam mixing.
- Partially coherent beams and Gaussian irradiance profiles are common in such systems.
Purpose of the Study:
- To analyze the average SNR from mixing partially coherent, collinear Gaussian beams.
- To express SNR as a function of beam parameters and photodetector area.
- To theoretically explain observed phenomena like saturation and coherence degradation.
Main Methods:
- Detailed mathematical analysis of SNR.
- Examination of SNR dependence on beam cross-sections, coherence areas, and photodetector area.
- Derivation of optimal parameters for local oscillator beams.
Main Results:
- SNR is shown to be a function of beam cross-sections, coherence areas, and photodetector area.
- Saturation, coherence suppression, and degradation effects are theoretically explained.
- Optimum local oscillator beam size and coherence area are derived.
Conclusions:
- The derived SNR function provides a comprehensive understanding of system performance.
- The findings offer practical guidance for optimizing optical mixing systems.
- Theoretical explanations for observed phenomena enhance the understanding of partially coherent beam interactions.
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