Array size scalability of passively coherently phased fiber laser arrays | Zendy

Wei-zung Chang | Zendy; Tsai-wei Wu | Zendy; Herbert G. Winful | Zendy; Almantas Galvanauskas | Zendy

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Array size scalability of passively coherently phased fiber laser arrays

Author(s) -

Wei-zung Chang,

Tsai-wei Wu,

Herbert G. Winful,

Almantas Galvanauskas

Publication year - 2010

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.18.009634

Subject(s) - optics , beat (acoustics) , fiber laser , phased array , laser , wavelength , materials science , laser power scaling , power (physics) , physics , telecommunications , computer science , quantum mechanics , antenna (radio)

We explore, by means of experiments and simulation, the power combining efficiency and power fluctuation of coherently phased 2, 4, 6, 8, 10, 12, 14, 16-channel fiber-laser arrays using fused 50:50 single-mode couplers. The measured evolution of power combining efficiency with array size agrees with simulations based on a new propagation model. For our particular system the power fluctuations due to small wavelength-scale length variations are seen to scale with array size as N(3). Beat spectra support the notion that a lack of coherently-combined supermodes in arrays of increasing size leads to a decrease in combined-power efficiency.

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