Phase-matched third-harmonic generation in highly germanium-doped fiber

摘要

Phase-matched third-harmonic generation is demonstrated in a germanium-doped optical fiber. Green light at 514.4 nm is generated in an LP_(03) mode when a pump field at approx1543.3 nm is launched into the fiber in the fundamental LP_(01) mode. The phase matching is achieved for a particular combination of the germanium doping concentration and the fiber core diameter.