Abstract
Quasi-phase matching (QPM) in waveguides enables high conversion efficiency of only one passage in second-harmonic generation(SHG) devices because of high power density and long interaction length. Among nonlinear materials, LiTaCO3 has high resistance to optical damage1) and large nonlinearity. We have already demonstrated a LiTaO3-SHG device with the periodical domain inversion by proton exchange and heating2). However, because proton diffusion shapes the domain inversion, the shorter the period, the shallower the inversion. For 3 to 4-µm periods in 1st-order QPM, the domain inversion was less than 1 µm deep for a waveguide depth of about 2 µm. Recently, quick heat treatment has given a 1.5-µm depth with a 3.5 µm period3). Deeper domain inversion over the waveguide depth increases SHG efficiency. Other approaches for deep domain inversion are electron-beam scanning4)5) and direct electric-field application6).
© 1992 Optical Society of America
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