BANDWIDTH ENGINEERING FOR EFFICIENT FREQUENCY DOUBLING OF HIGH POWER FIBER LASERS USING PERIODICALLY POLED KTP CRYSTALS

ABSTRACT

Dependence of both acceptance bandwidth and frequency conversion efficiency on the linear periodicity fluctuation in domain-inverted KTP crystals was investigated. The study was mainly focused on three main emission wavelength bands of current commercially available high power optical fiber lasers. That to use these artificially introduced domain periodicity fluctuations as the potential means to match the nonlinear crystal's acceptance bandwidth to a high power fiber laser's emission linewidth is believed effective in maximizing the nonlinear frequency conversion efficiency as much as possible.

keywords:

• KTP
• quasi-phase matching
• nonlinear optics
• fiber laser

ACKNOWLEDGMENT

The authors would like to acknowledge the support from the United States Air Force Office of Scientific Research (AFOSR) and the United States Air Force Research Laboratories (AFRL) at both Kirtland and Wright Patterson bases.