Noise Reduction in Photorefractive Image Amplification by Contradirectional Two-Wave Mixing in Rh-Doped BaTiOa Crystal

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2000,（7）
• 页码范围: 507-509
• 页数: 3页
• 语种: 英文

摘要

Low noise image amplification owing to contradirectional two-wave mixing (CTWM) is proposed and demon strafed in Rh-doped BaTiOa crystal. Comparing with the conventional forward two-wave mixing scheme, an enhancement of signal-to-noise ratio in the order of 103 is obtained. The theoretical analyses are presented and give a reasonable explanation for the experimental results. The further discussion shows that CTWM scheme can also reduce the influence of the crystal absorption and crystal size on the two-wave mixing process to rise the signal beam gain.