Infrared Supercontinuum Generation in Cladding of a Hollow-Core Fiber Pumped with a 1-ns 1.06-μm Nd3+:YAG/Cr4+:YAG Microchip Laser

摘要

We present an experimental treatment for the super-continuum (SC) generated through a hollow-core fiber by ananosecond pulse launched from a Q-switched microchip Nd3+:YAG/Cr4+:YAG laser. The SC spectrally spans over ahalf-octave in near IR (~1.0–1.5 μm) and is attainable yet at fairly moderate fiber length (tens of cm). The SC generationprocess is shown to originate from silica nodes of the fiber cladding (“secondary cores”), where the pump radiation istightly focused, and to be triggered out by a four-wave mixing process, which is boosted up by the Raman response in thefiber.