Details
| Original language | English |
|---|---|
| Article number | 054013 |
| Journal | Physical Review Applied |
| Volume | 14 |
| Issue number | 5 |
| Publication status | Published - 6 Nov 2020 |
Abstract
We propose a method to track signals from quadrant photodiodes (QPDs) 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 signals, this method employs a set of coupled tracking loops that operate directly on the combined length and angular signals. The benefits are an increased signal-to-noise ratio in the loops and the possibility of adapting the loop bandwidths to the differing 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 intersatellite laser interferometry in ultralow light conditions.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Physical Review Applied, Vol. 14, No. 5, 054013, 06.11.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tracking Length and Differential-Wavefront-Sensing Signals from Quadrant Photodiodes in Heterodyne Interferometers with Digital Phase-Locked-Loop Readout
AU - Heinzel, Gerhard
AU - Álvarez, Miguel Dovale
AU - Pizzella, Alvise
AU - Brause, Nils
AU - Delgado, Juan José Esteban
N1 - Funding information: The authors acknowledge the support of the German Space Agency, DLR (Grant No. FKZ 50OQ1801); Clusters of Excellence “QuantumFrontiers: Light and Matter at the Quantum Frontier: Foundations and Applications in Metrology” (EXC-2123, Project No. 390837967), and PhoenixD: “Photonics, Optics, and Engineering–Innovation Across Disciplines” (EXC-2122, Project No. 390833453).
PY - 2020/11/6
Y1 - 2020/11/6
N2 - We propose a method to track signals from quadrant photodiodes (QPDs) 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 signals, this method employs a set of coupled tracking loops that operate directly on the combined length and angular signals. The benefits are an increased signal-to-noise ratio in the loops and the possibility of adapting the loop bandwidths to the differing 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 intersatellite laser interferometry in ultralow light conditions.
AB - We propose a method to track signals from quadrant photodiodes (QPDs) 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 signals, this method employs a set of coupled tracking loops that operate directly on the combined length and angular signals. The benefits are an increased signal-to-noise ratio in the loops and the possibility of adapting the loop bandwidths to the differing 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 intersatellite laser interferometry in ultralow light conditions.
UR - http://www.scopus.com/inward/record.url?scp=85096091980&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2005.00003
DO - 10.48550/arXiv.2005.00003
M3 - Article
AN - SCOPUS:85096091980
VL - 14
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 5
M1 - 054013
ER -