Morin M, Duree G, Salamo G, Segev M
Opt Lett. 1995 Oct 15;20(20):2066-8. doi: 10.1364/ol.20.002066.
We show that a quasi-steady-state photorefractive spatial soliton forms a waveguide structure in the bulk of a photorefractive material. Although the optically induced waveguide is formed by a very low-power (microwatts) soliton beam, it can guide a powerful (watt) beam of a longer wavelength at which the medium is nonphotosensitive. Furthermore, the waveguide survives, either in the dark or when guiding the longerwavelength beam, for a long time after the soliton beam is turned off. We take advantage of the solitons' property of evolution from a relatively broad input beam into a narrow channel and show that the soliton induces a tapered waveguide (an optical funnel) that improves the coupling efficiency of light into the waveguiding structure.
我们证明，准稳态光折变空间孤子在光折变材料体内形成波导结构。尽管光致波导是由非常低功率（微瓦）的孤子光束形成的，但它能够引导波长更长且介质对其不感光的高功率（瓦）光束。此外，在孤子光束关闭后很长时间内，该波导在黑暗中或引导长波长光束时都能存在。我们利用孤子从相对较宽的输入光束演化为狭窄通道的特性，证明孤子会诱导出一个锥形波导（光漏斗），从而提高光与波导结构的耦合效率。
