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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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Published on: March 12, 2019

Time-lens photon Doppler velocimetry (TL-PDV).

Pinghan Chu¹, Velat Kilic², Mark A Foster²

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

The Review of Scientific Instruments

|July 10, 2021

Summary

A novel time lens (TL) enhances photon Doppler velocimetry (PDV) systems by expanding dynamic range. This technology, demonstrated through simulations, allows for broader velocity measurements and use of lower bandwidth electronics.

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Area of Science:

Photonics and Optical Engineering
Advanced Measurement Techniques

Background:

Photon Doppler velocimetry (PDV) measures target motion via Doppler frequency shifts.
Current PDV systems face limitations in velocity range due to electronic sampling rates.

Purpose of the Study:

To introduce a time lens (TL) system for expanding the dynamic range of PDV.
To demonstrate the feasibility of TL-PDV for enhanced velocity measurements.

Main Methods:

Utilizing a four-wave-mixing (FWM) time lens to apply quadratic temporal phase modulation to optical signals.
Employing nonlinear media like integrated photonic waveguides or highly nonlinear optical fibers.
Implementing spectral isolation of the FWM idler product and dispersion management for temporal magnification.

Main Results:

Simulations confirm the feasibility of the TL-PDV principle.
A magnification factor (M) of 10 is shown to be achievable for the time lens.
The system effectively "slows down" Doppler frequency shifts.

Conclusions:

The developed TL-PDV system significantly expands the velocity measurement range of PDV.
This advancement enables the use of lower bandwidth electronics, reducing system complexity and cost.
TL-PDV is poised to facilitate new research in dynamic material experiments.