Abstract

Efficient frequency doubling in phosphorous doped optical fibers has been widely observed. A conversion efficiency of 13% at 951 watts peak power at the fundamental frequency has been reported [1]. Fibers prepared with only fundamental light (1.064µm) have previously been studied [2] and found to have the characteristic input intensity squared dependence on second harmonic (SH) output associated with χ⁽²⁾ interactions. However, the growth of the SH is not quadratic with length [3], implying a length dependent χ⁽²⁾ in the optical fiber. The purpose of this study is to determine what parameters are important during the preparation of the fiber for the final length dependence of the SH.

© 1989 Optical Society of America