Characteristics of periodically domain-inverted LiNbO3 and LiTaO3 waveguides for second harmonic generation

Kazuhisa Yamamoto, Kiminori Mizuuchi, Kunihiko Takeshige, Yoichi Sasai, Tetsuo Taniuchi

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65 Citations (Scopus)

Abstract

Characteristics of waveguides with periodically domain-inverted regions in LiNbO3 and LiTaO3 for quasi-phase-matched (QPM) second harmonic generation are investigated. The domain-inverted regions in LiNbO 3 are formed by heat treatment using selective SiO2 mask and those in LiTaO3 are formed by heat treatment using selective proton exchange. The domain-inverted region in LiTaO3 is fabricated up to 2.7 μm depth, which is twice as deep as that in LiNbO3. The channel waveguides incorporating the regions are fabricated using proton exchange by pyrophosphoric acid. The propagation loss (0.9 dB/cm) of LiTaO 3 waveguide is much lower than that of LiNbO3 waveguide (2.9 dB/cm). The second harmonic power generated in LiTaO3 waveguide by third-order QPM consequently has three time higher conversion efficiency, compared to that in LiNbO3 waveguide. In domain-inverted LiNbO 3 waveguide, we have observed optical damage. On the other hand, in domain-inverted LiTaO3 waveguide, stable blue light (421 nm) has been obtained without optical damage.

Original languageEnglish
Pages (from-to)1947-1951
Number of pages5
JournalJournal of Applied Physics
Volume70
Issue number4
DOIs
Publication statusPublished - 1991 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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