Self-organized coherence between fiber lasers has been reported both via all-fiber 2x2 directional coupler trees and in spatially multi-core fibers. We have taken this a major step forward, coupling together a number of independent fiber lasers to obtain a spatially and spectrally coherent far field, with no active length, polarization, or amplitude control. The near field output comes from a spatial array rather than from a single fiber, making this approach scalable to extremely high power.
The use of solar cells to drive sensors with optical pumping using readily available laser sources over kilometer lengths is proposed. A simple evaluation finds near IR transmission around 1000-1070 nm is optimal. As proof of principle, we demonstrate a simple humidity sensor powered by solar cell through a 2 km optical fibre link using the 1057 nm output of a Nd:YLF solid state laser.
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