Domain inversion in KTiOPO4 using electron beam scanning

Abstract

Domain inversion in c-cut KTiOPO4 was produced by scanning an electron beam on the −c face. The domain reversal occurred through the 1 mm thickness of the sample. Second-harmonic conversion efficiency of 7×10−5 was measured for a fifth-order grating by focusing the beam to a 7 μm spot in a 500-μm-long domain-inverted KTP crystal. This efficiency is close to the theoretical value of 9×10−5. The measured phase matching bandwidth was 1.9 nm, which is in agreement with the theoretical value of 1.5 nm indicating that the domain-inverted grating is reasonably uniform over its entire length.

Multiple-crystal x-ray topographic characterization of periodically domain-inverted KTiOPO4 crystal

“…14 Furthermore, techniques to fabricate periodic domain inversion in LiNbO 3 15-18 and LiTaO 3 , 19 as well as in KTP, 14,20,21 have been developed rapidly. However, it seems that periodically poled domain structures have not been well understood thus far.…”

Quasi-accord de phase et interactions non linéaires en optique intégrée

“…Depuis 1993, on a mené de nombreuses études pour parvenir à contrôler ce processus et aujourd'hui de nombreuses techniques ont été adaptées au LiNbO,, au LiTa0 3 , au KTP et au RTA [42,43,44,45,46,47,48]. Dans cette configuration, les guides d'onde introduisent les mêmes avantages et les mêmes exigences supplémentaires que dans le cas de l'accord de phase parfait, et les résultats obtenus en fluorescence paramétrique vont nous permettre d'illustrer leurs possibilités.…”

Bulk PPKTP by crystal growth from high temperature solution

“…Periodic inversion of ferroelectric domains in the nonlinear crystal KTiOPO 4 (KTP) [1][2][3][4] has been extensively used in order to achieve frequency conversion by Quasi-Phase-Matching (QPM) [5], which is more efficient than by performing Birefringence-Phase-Matching (BPM) in a single domain KTP crystal. Until now, commercially Periodically Poled KTP (PPKTP) crystals were fabricated by the electric field poling technique, based on the inversion of the spontaneous polarization P s by applying a high electric field to a single domain crystal [6].…”