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Proceedings Paper

Optical modeling for a laser phased-array directed energy system
Author(s): Gary B. Hughes; Philip Lubin; Janelle Griswold; Brianna Cook; Durante Bozzini; Hugh O'Neill; Peter Meinhold; Jonathan Suen; Johanna Bible; Jordan Riley; Isabella E. Johansson; Mark Pryor; Miikka Kangas
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Paper Abstract

We present results of optical simulations for a laser phased array directed energy system. The laser array consists of individual optical elements in a square or hexagonal array. In a multi-element array, the far-field beam pattern depends on both mechanical pointing stability and on phase relationships between individual elements. The simulation incorporates realistic pointing and phase errors. Pointing error components include systematic offsets to simulate manufacturing and assembly variations. Pointing also includes time-varying errors that simulate structural vibrations, informed from random vibration analysis of the mechanical design. Phase errors include systematic offsets, and time-varying errors due to both mechanical vibration and temperature variation in the fibers. The optical simulation is used to determine beam pattern and pointing jitter over a range of composite error inputs. Results are also presented for a 1 m aperture array with 10 kW total power, designed as a stand-off system on a dedicated asteroid diversion/capture mission that seeks to evaporate the surface of the target at a distance of beyond 10 km. Phase stability across the array of λ/10 is shown to provide beam control that is sufficient to vaporize the surface of a target at 10 km. The model is also a useful tool for characterizing performance for phase controller design in relation to beam formation and pointing.

Paper Details

Date Published: 17 September 2014
PDF: 7 pages
Proc. SPIE 9226, Nanophotonics and Macrophotonics for Space Environments VIII, 922603 (17 September 2014); doi: 10.1117/12.2059948
Show Author Affiliations
Gary B. Hughes, California Polytechnic State Univ., San Luis Obispo (United States)
Philip Lubin, Univ. of California, Santa Barbara (United States)
Janelle Griswold, Univ. of California, Santa Barbara (United States)
Brianna Cook, Univ. of California, Santa Barbara (United States)
Durante Bozzini, California Polytechnic State Univ., San Luis Obispo (United States)
Hugh O'Neill, California Polytechnic State Univ., San Luis Obispo (United States)
Peter Meinhold, Univ. of California, Santa Barbara (United States)
Jonathan Suen, Univ. of California, Santa Barbara (United States)
Johanna Bible, Univ. of California, Santa Barbara (United States)
Jordan Riley, Univ. of California, Santa Barbara (United States)
Isabella E. Johansson, Columbia Univ. (United States)
Mark Pryor, Vorticity, Inc. (United States)
Miikka Kangas, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 9226:
Nanophotonics and Macrophotonics for Space Environments VIII
Edward W. Taylor; David A. Cardimona, Editor(s)

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