Test of photovoltaic model of photoinduced second-harmonic generation in optical fibers

Eugeni M. Dianov; Peter G. Kazansky; Christof G. Krautschik; Dmitrii Yu. Stepanov

doi:10.1117/12.51145

30 December 1991 Test of photovoltaic model of photoinduced second-harmonic generation in optical fibers

Eugeni M. Dianov, Peter G. Kazansky, Christof G. Krautschik, Dmitrii Yu. Stepanov

Proceedings Volume 1516, International Workshop on Photoinduced Self-Organization Effects in Optical Fiber; (1991) https://doi.org/10.1117/12.51145
Event: International Workshop on Photoinduced Self-Organization Effects in Optics, 1991, Quebec City, Canada

Abstract

It is shown that second-harmonic generation efficiency in a photovoltaic model depends on the relationship of illuminated size to grating period. Model test experiments are proposed and realized. To explain the photo-induced second-harmonic generation (SHG) in glass optical fibers, two groups of models have been suggested, some based on separation of charges and appearance of a strong electrostatic field the others based on orientation of defects. However, a strong electrostatic field (approximately equals 10⁴ V/cm) appears also in the last models. That is why neither the experiment on the discovery of such a field nor the experiment on the measurement of the component (chi)⁽²⁾ tensor ratio gives an answer to the preference of either model. This paper shows that the efficiency of SHG by a (chi)⁽²⁾ grating, resulting from a coherent photocurrent, depends strongly (approximately equals (r₀/(Lambda) )^-4) on the ratio of the transverse size r₀ of the light beam, used for the grating preparation, and the grating period (Lambda). So we think that an experiment on SHG in a bulk sample to check this point will make it possible to clear up the mechanism of (chi)⁽²⁾ grating formation. Another possibility is an experiment with the (chi)⁽²⁾ grating writing by pump and second-harmonic waves, propagating in opposite directions in a fiber. In this case the grating period will decrease to (lambda)_p/4 approximately equals 0.25 micrometers.

Citation Download Citation

Eugeni M. Dianov, Peter G. Kazansky, Christof G. Krautschik, and Dmitrii Yu. Stepanov "Test of photovoltaic model of photoinduced second-harmonic generation in optical fibers", Proc. SPIE 1516, International Workshop on Photoinduced Self-Organization Effects in Optical Fiber, (30 December 1991); https://doi.org/10.1117/12.51145

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