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Proceedings Paper

Local phase control for a planar array of fiber laser amplifiers
Author(s): Patrick Steffanic; Benjamin T. Johannes; Claudia A. Sison; Gary B. Hughes; Philip Lubin; Peter Meinhold; Jonathan Suen; Hugh O'Neill; Miikka Kangas; Travis Brashears; Qicheng Zhang; Janelle Griswold; Jordan Riley; Caio Motta
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Paper Abstract

Arrays of phase-locked lasers have been developed for numerous directed-energy applications. Phased-array designs are capable of producing higher beam intensity than similar sized multi-beam emitters, and also allow beam steering and beam profile manipulation. In phased-array designs, individual emitter phases must be controllable, based on suitable feedback. Most current control schemes sample individual emitter phases, such as with an array-wide beam splitter, and compare to a master phase reference. Reliance on a global beam splitter limits scalability to larger array sizes due to lack of design modularity. This paper describes a conceptual design and control scheme that relies only on feedback from the array structure itself. A modular and scalable geometry is based on individual hexagonal frames for each emitter; each frame cell consists of a conventional lens mounted in front of the fiber tip. A rigid phase tap structure physically connects two adjacent emitter frame cells. A target sensor is mounted on top of the phase tap, representing the local alignment datum. Optical sensors measure the relative position of the phase tap and target sensor. The tap senses the exit phase of both emitters relative to the target normal plane, providing information to the phase controller for each emitter. As elements are added to the array, relative local position data between adjacent phase taps allows accurate prediction of the relative global position of emitters across the array, providing additional constraints to the phase controllers. The approach is scalable for target distance and number of emitters without loss of control.

Paper Details

Date Published: 1 September 2015
PDF: 12 pages
Proc. SPIE 9616, Nanophotonics and Macrophotonics for Space Environments IX, 961607 (1 September 2015); doi: 10.1117/12.2189821
Show Author Affiliations
Patrick Steffanic, California Polytechnic State Univ., San Luis Obispo (United States)
Benjamin T. Johannes, California Polytechnic State Univ., San Luis Obispo (United States)
Claudia A. Sison, California Polytechnic State Univ., San Luis Obispo (United States)
Gary B. Hughes, California Polytechnic State Univ., San Luis Obispo (United States)
Philip Lubin, Univ. of California, Santa Barbara (United States)
Peter Meinhold, Univ. of California, Santa Barbara (United States)
Jonathan Suen, Univ. of California, Santa Barbara (United States)
Hugh O'Neill, Ventura College (United States)
Miikka Kangas, Univ. of California, Santa Barbara (United States)
Travis Brashears, Univ. of California, Santa Barbara (United States)
Qicheng Zhang, Univ. of California, Santa Barbara (United States)
Janelle Griswold, Univ. of California, Santa Barbara (United States)
Jordan Riley, Univ. of California, Santa Barbara (United States)
Caio Motta, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 9616:
Nanophotonics and Macrophotonics for Space Environments IX
Edward W. Taylor; David A. Cardimona, Editor(s)

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