Articles written in Pramana – Journal of Physics
Volume 96 All articles Published: 19 May 2022 Article ID 0103 Research Article
High-speed photon Doppler velocimetry for laser-driven flyer acceleration studies
S CHAURASIA ASHUTOSH MOHAN A K POSWAL JOHN PASLEY
Photon Doppler velocimetry (PDV), a high-speed velocimetry technique, was implemented for measuring the rear-surface velocity of a laser-driven flyer. This system is compact and rugged compared to the VISAR and Fabry–Perot interferometer-based diagnostics that are often employed in laser-driven flyer experiments to measure the velocity of fast-moving surfaces. The main components of this system are an ultra-low bandwidth 2W CW laser operating at 1550 nm, an optical circulator, a fibre-optic probe, a fast photodiode (<35 ps rise time and >10 GHz bandwidth) and a high-bandwidth (8 GHz) digitizer with 20 GSa/s sampling rate. The maximum flyer velocity that can be measured by our implementation of this diagnostic is 5 km/s which is limited by the bandwidth of electronic components used in the system. Here, we also studied the optimisation of the diagnostic using different types of speakers with different in-house developed software depending on the applications. Finally,the system was used to measure the rear-surface velocity of a laser-driven flyer in the air. The maximum flyer velocity measured is ∼1.49 km/s. One-dimensional (1D) radiation-hydrodynamics simulations using the HYADES code were performed and were found to be in excellent agreement with the measured velocities.
Volume 97, 2023
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode