Roles of resonance and dark irradiance for infrared photorefractive self-focusing and solitons in bi-polar InP:Fe

TL;DR

This study provides experimental evidence of photorefractive self-focusing and solitons in InP:Fe at infrared wavelengths, and demonstrates that a single photocarrier model can explain these phenomena despite the material's bipolar nature.

Contribution

It shows that the traditional single photocarrier model effectively explains photorefractive solitons in bipolar InP:Fe, linking dark irradiance and resonance intensity.

Findings

Photorefractive self-focusing observed at 1.06 and 1.55 μm in InP:Fe.

Single photocarrier model applicable despite bipolar nature.

Relationship established between dark irradiance and resonance intensity.

Abstract

This paper shows experimental evidence of photorefractive steady state self-focusing in InP:Fe for a wide range of intensities, at both 1.06 and 1.55$\mu$m. To explain those results, it is shown that despite the bi-polar nature of InP:Fe where one photocarrier and one thermal carrier are to be considered, the long standing one photocarrier model for photorefractive solitons can be usefully applied. The relationship between the dark irradiance stemming out of this model and the known resonance intensity is then discussed.