Design and Fabrication of Multi-Periodically Poled Lithium Niobate Strip Waveguide Green Lasers
Date Issued
2012
Date
2012
Author(s)
Yang, Yu-Hsuan
Abstract
Segment-chirped grating structure is used for the fabrication of multi-periodically poled lithium niobate (PPLN) for second harmonic generation (SHG) of green laser. To enhance the optical confinement, some metal diffused waveguides are fabricated on the structure. Green laser of wavelength 532nm is obtained by the quasi-phase matching second harmonic generation (QPM-SHG), when launched with an incident laser of wavelength 1064nm.
Zinc-and-nickel co-diffusion and gallium diffusion waveguides of the same linewidth 160 μm are fabricated. TM and TE modes are supported in the zinc-and-nickel co-diffusion waveguide, but only TM modes are supported in the gallium diffusion waveguide.
PPLN with the zinc-and-nickel co-diffusion waveguide has a temperature bandwidth of 45˚C and a green laser conversion efficiency of 15%. PPLN with the gallium diffusion waveguide has a temperature bandwidth of 50˚C and a green laser conversion efficiency of 13.3%.
As compared with single period waveguide PPLN, the temperature bandwidth of segment-chirped grating ZnNi:PPLN is broadened by a factor of 9, whereas the conversion efficiency is reduced only by a factor of 1.47. As for the Ga:PPLN, the temperature broadening factor 7 and the conversion efficiency reduction factor is 1.33. That shows waveguides provide significant optical confinement to compensate for the decrease in conversion efficiencies of PPLN.
Subjects
Poling
Segment chirped grating
green laser
Lithium niobate
second harmonic
Type
thesis
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