Paving the way for third harmonic generation in hollow-core photonic bandgap fibers

Abstract

We present two novel hybrid photonic structures made of silica that possess two well-separated frequency bandgaps. The addition of interstitial air holes in a precise location and size allows these bandgaps to open up with a ratio of $\sim 3$ between their central frequencies at the air line $c{k}_z/w=1$, thus fulfilling the basic guidance condition for third harmonic generation in hollow-core fibers. In addition, these designs may serve as high-power laser delivery of two well-separated wavelengths, such as visible and near infrared.

4 pages with 5 figures