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BaTiO_3 전기 광학 결정에서의 홀로그램 회절특성에 관한 연구
한현미,황웅,이상조,곽종훈 嶺南大學校基礎科學硏究所 2001 基礎科學硏究 Vol.21 No.-
To understand the principle of hologram recording, we fabricate a hologram in a photopolymer film that has a large diffraction efficiency. We performed two-beam coupling experiments in photorefractive BaTiO_3 crystal and measured real-time diffraction efficiency against incident beam angle. Phase shift of photorefractive grating with respect to the intensity grating is also measured by means of the grating translation technique.
Knife edge 방법과 렌즈를 이용한 Z-scan 방법으로 초점에서 Gaussian 빔의 반경 측정 및 해석
이상조,우성룡,황웅,김지영,곽종훈 嶺南大學校基礎科學硏究所 2002 基礎科學硏究 Vol.22 No.-
A conventional knife edge method for profiling focused and unfocused laser beams with a high spatial resolution is presented. We also present a simple method for determining Gaussian beam waist by using lens Z-scan. And a good agreement is found between knife edge and lens Z-scan methods. Success in lens Z-scan method requires sensitive measurement of transmittance data.