公开(公告)号：JPH05289137A

公开(公告)日：1993-11-05

申请号：JP9127992

申请日：1992-04-10

Applicant: SONY CORP

Inventor： MATSUMOTO SHUICHI ,  YAMADA MASAHIRO

IPC: G02B6/12 ,  G02B6/13 ,  G02F1/37 ,  H01S3/083 ,  H01S3/09 ,  H01S3/109

Abstract: PURPOSE:To improve conversion efficiency by constituting a resonator including a non-linear optical crystal. CONSTITUTION:The device is provided with the non-linear optical crystal plate 2 having a periodic structure of reversing polarization 1 in which a polarization reversing region is formed throughout the thickness of the plate and the resonator containing the nonlinear optical crystal plate 2 is constituted. Thus, since phase matching is surely performed, a so-called bulk-type SHG(a second harmonic generator) with a high conversion efficiency is constituted. Since total reflection is generated by forming the principal planes 2a and 2b of the non-linear optical crystal 2 for optical waveguiding into parallel planes or a fundamental wave is made to propagate over comparatively a long distance by crystallizing the reflecting plane while the guided light satisfies a pseudo phase-matching condition by means of a periodic structure of reversing polarization 1, the distance of non-linear interaction is extended and the conversion efficiency of the second harmonic is increased.