Tracking Length and Differential-Wavefront-Sensing Signals from Quadrant Photodiodes in Heterodyne Interferometers with Digital Phase-Locked-Loop Readout
| Autor: | N. Brause, Miguel Dovale Álvarez, Alvise Pizzella, Juan Jose Esteban Delgado, Gerhard Heinzel |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics - Instrumentation and Detectors
Wavefronts FOS: Physical sciences General Physics and Astronomy Phase locked loops Dynamical behaviors 02 engineering and technology Quadrant (instrument) 01 natural sciences Laser mode locking law.invention Attractive solutions Heterodyne interferometer Heterodyne laser interferometers Laser interferometry Optics law Underwater acoustics 0103 physical sciences Astronomical interferometer ddc:530 Light conditions 010306 general physics Photodiodes Instrumentation and Methods for Astrophysics (astro-ph.IM) Wavefront Physics Signal to noise ratio Interferometers business.industry Quadrant photodiodes Instrumentation and Detectors (physics.ins-det) 021001 nanoscience & nanotechnology Laser Photodiode Phase-locked loop Heterodyning Differential wavefront sensing Digital phase locked loops Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik Astrophysics - Instrumentation and Methods for Astrophysics 0210 nano-technology business Physics - Optics Optics (physics.optics) |
| Zdroj: | Physical Review Applied 14 (2020), Nr. 5 Physical Review Applied |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.14.054013 |
| Popis: | We propose a method to track signals from quadrant photodiodes (QPD) in heterodyne laser interferometers that employ digital phase-locked loops for phase readout. Instead of separately tracking the four segments from the QPD and then combining the results into length and Differential Wavefront Sensing (DWS) signals, this method employs a set of coupled tracking loops that operate directly on the combined length and angular signals. Benefits are increased signal-to-noise ratio in the loops and the possibility to adapt the loop bandwidths to the different dynamical behavior of the signals being tracked, which now correspond to physically meaningful observables. We demonstrate an improvement of up to 6 dB over single-segment tracking, which makes this scheme an attractive solution for applications in precision inter-satellite laser interferometry in ultra-low-light conditions. Comment: 11 pages, 8 figures |
| Databáze: | OpenAIRE |
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