Abstract
We provide a comprehensive study on one-third harmonic generation (OTHG) in highly Germania-doped fiber (HGDF) by analyzing the phase matching conditions for the step index-profile and optimizing the design parameters. For stimulated OTHG in HGDF, the process can be enhanced by fiber attenuation at the pump wavelength which dynamically compensates the accumulated phase-mismatch along the fiber. With 500 W pump and 35 W seed power, simulation results show that a 31% conversion efficiency, which is 4 times higher than the lossless OTHG process, can be achieved in 34 m of HGDF with 90 mol. % GeO2 doping in the core.
Highlights
Third harmonic generation (THG) has been intensively investigated both theoretically and experimentally in past literature [1,2,3,4], the inverse process of one-third harmonic generation (OTHG) remains a new topic that has been attracting increasing research attentions
We provide a comprehensive study on one-third harmonic generation (OTHG) in highly Germania-doped fiber (HGDF) by analyzing the phase matching conditions for the step index-profile and optimizing the design parameters
With 500 W pump and 35 W seed power, simulation results show that a 31% conversion efficiency, which is 4 times higher than the lossless OTHG process, can be achieved in 34 m of HGDF with 90 mol. % GeO2 doping in the core
Summary
Third harmonic generation (THG) has been intensively investigated both theoretically and experimentally in past literature [1,2,3,4], the inverse process of one-third harmonic generation (OTHG) remains a new topic that has been attracting increasing research attentions. Previous studies on OTHG categorize the process into two kinds, namely, spontaneous downconversion and stimulated downconversion. The former was recently analyzed by Gravier [5], Corona [6] and Richard [7]. Stimulated downconversion, on the other hand, is more appealing as the OTHG process can be seeded to achieve high conversion efficiency. HGDF is a good candidate for OTHG because of its capability to achieve inter-modal phase matching and low attenuation characteristics around 0.5 μm and 1.5 μm.
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