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Multi-wavelength crosstalk-free photonic Doppler velocimetry
Yohan Barbarin1, Gaël Le Blanc1, Thierry d'Almeida1
1CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France.
The Review of Scientific Instruments
|December 31, 2020
Summary
Multiplexed photonic Doppler velocimetry systems were enhanced using wavelength multiplexing to eliminate crosstalk in high-density velocity measurements for shock physics experiments. This advancement enables more accurate data collection on novel materials.
Area of Science:
- Physics
- Materials Science
- Optical Engineering
Background:
- Multiplexed photonic Doppler velocimetry (PDV) is crucial for high-density velocity measurements in shock physics experiments.
- Decreasing mesh size in PDV systems can introduce crosstalk, compromising data accuracy.
- Wavelength multiplexing offers a solution to mitigate crosstalk issues in PDV.
Purpose of the Study:
- To develop and demonstrate a crosstalk-free multiplexed photonic Doppler velocimetry system.
- To overcome crosstalk limitations in high-density velocity measurements for novel materials research.
- To reduce the number of fiber components in PDV systems through wavelength multiplexing.
Main Methods:
- Characterization of crosstalk on a line of eight collimators with a 1 mm pitch.
- Development of a photonic Doppler velocimetry system utilizing 16 telecom wavelengths.
- Design of the system for velocities up to 1000 m/s and a 2 GHz bandwidth with 100 GHz channel spacing.
Main Results:
- A crosstalk-free photonic Doppler velocimetry system with 16 telecom wavelengths was successfully built.
- Wavelength multiplexing led to a reduction in the total number of fiber components.
- The system demonstrated dynamic performance at approximately 80 m/s during a ramp compression experiment.
Conclusions:
- Wavelength multiplexing effectively eliminates crosstalk in multiplexed photonic Doppler velocimetry systems.
- The developed system is suitable for high-density velocity measurements in demanding physics experiments.
- This technology advances the study of novel materials under shock conditions.
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