[OPTICAL REVIEW Vol. 1, No. 1 (1994) 100-102]

Second-Harmonic Generation in Domain-Inverted Grating Induced by Focused Ion Beam

Kiminori MIZUUCHI and Kazuhisa YAMAMOTO

Materiais and Devices Laboratory, Matsushita Electric Industrial Co., Ltd., 3-1-1, Yagumo-Nakamachi, Moriguchi, Osaka 570, Japan

(Accepted August 2, 1994)

The fabrication of a periodic domain inversion in LiTaO3 and LiNbO3 using direct ion-beam writing is presented. The polarization of these materials can be reversed at room temperature by irradiating Si2+ ions into +c faces. A first-order periodic domain inversion with a 50% duty cycle, a depth of 300μm, and an interaction length of 1 mm was realized in LiTaO3. Using this structure, 30μW of blue light was generated for a conversion efficiency of 0.25%/W.

Key words : SHG (second-harmonic generation), QPM (quasi-phase matching), LiNbO3 (lithium niobate), LiTaO3 (lithium tantalate), FIB (focused ion beam), domain inversion