Optically based velocity and topographic measurement systems in the nano-scale for developing optical initiation

A. R. Valenzuela; G. Rodriguez; S. A. Clarke

doi:10.1117/12.734959

13 September 2007 Optically based velocity and topographic measurement systems in the nano-scale for developing optical initiation

A. R. Valenzuela, G. Rodriguez, S. A. Clarke

Author Affiliations +

Proceedings Volume 6662, Optical Technologies for Arming, Safing, Fuzing, and Firing III; 66620A (2007) https://doi.org/10.1117/12.734959
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

We have developed a suite of optical diagnostics and analyses for probing the velocity and spatial distribution of ablatively launched metal with nano-scale precision. We utilize a nanosecond laser pulse to launch a thin layer of metal and then use optical and opto-electronic devices to diagnose the velocity and topography. Our Photonic Doppler Velocimeter (PDV) utilizes the heterodyne principle that allows us to track multiple velocity components. We have investigated a number of different methods for analyzing this data to provide increased velocity and temporal resolution. We also discuss the possibilities to extend the sensitivity of the PDV system to provide a compact diagnostic with a broad range of capabilities. Our topographer is based on the Shack-Hartmann interferometer that can resolve the changing shape of the ablated metal surface as it is launched. We compare the experimental data to hydrodynamic simulations to provide a feedback loop to improve our theoretical models. The ultimate goal is to develop a well-understood laser-based firing set for direct optical initiation (DOI) of explosives.

Citation Download Citation

A. R. Valenzuela, G. Rodriguez, and S. A. Clarke "Optically based velocity and topographic measurement systems in the nano-scale for developing optical initiation", Proc. SPIE 6662, Optical Technologies for Arming, Safing, Fuzing, and Firing III, 66620A (13 September 2007); https://doi.org/10.1117/12.734959

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KEYWORDS

Pulsed laser operation

Laser ablation

Metals

Titanium

Sensors

Fiber lasers

Laser beam diagnostics

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