Study of Periodically Poled Lithium Niobate Strip Waveguide Green Lasers
Date Issued
2009
Date
2009
Author(s)
You, Wen-Chun
Abstract
Periodically poled lithium niobate (PPLN) is successfully fabricated on optical ridge waveguide for the second harmonic generation (SHG) of green laser. Various nickel in-diffused lithium niobate waveguides were fabricated for optical characterization. Experimental results show diffusion at 800ºC for 4 hr gives rise to the highest output power. For comparison, PPLN structures of the same length 6 mm but two different widths were fabricated. The first type of PPLN structure is fabricated on ridge structure of height 3μm and width 20 μm, and the second type has a width of 150 μm but without the ridge. For optical characterization, the temperature of phase-matching and conversion efficiency are measured by two different optical systems. Experimental results show the ridge waveguide exhibits a conversion efficiency of 20 % when pumped with a diode laser of wavelength 1064 nm, average power 6 mW, and peak intensity 25.5MW/cm2. The strip waveguide has a conversion efficiency of 13 % at an average power of 6.7 mW and a peak intensity of 12 MW/cm2. The results indicate more SHG energy can be obtained in a wider PPLN region.
Subjects
PPLN
SHG
lithium niobate
conversion efficiency
Type
thesis
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