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研發成果 >> New Research

 

A Preliminary Study on Air-Borne Lightwave Amplification Using Weibel-type Instabilities


Abstract

In man-made plasma sources, and in fusion experimental machines (such as the Tokamak), the emergence of a plasma phenomenon called the Weibel EM instability was sometimes witnessed. However, in those cases, Weibel instability was a path for system energy loss, and thus was undesirable. Here, instead, we intended to explore the possibility of applying such instability in the amplification of lightwaves of arbitrary wavelengths and amplitudes, in open space, in comparison with the traditional approach of resorting it to spatially-confined, wavelength-restricted erbium-doped optic fiber (EDOF). The attempted approach was to utilize controlled “plasma,” in the form of vertically oscillating (with respect to the intended incident light) electrons within a conductive grating, which in turn would trigger Weibel type instability on the incident lightwave such that exponential growth of the latter would occur. Rather than directly tackling the obscure nonlinear mechanism associated with the saturation phase of such instability, the anticipated lighwave amplification in air was verified unambiguously by experiments through the aid of a lock-in amplifier. The desirable amplitude enhancement could have been one to two orders of magnitude, in principle, had the incident wave phasing, amplifier transparency and arraying been properly conditioned and arranged. However, to achieve these ambitious goals in the future, nontrivial tasks such as dynamically sorting and synchronizing lightwave phases between the plasma electrons and photons of different coherent wave packets need to be accomplished in the first place.


 


Optical setup with lock-in amplifier

 

 

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