You Jang-Woo, Ahn Jeongho, Kim Soohyun, Kim Daesuk
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology 373-1, Kusong-dong, Yusong-gu, Daejeon, 305-701, Republic of Korea.
Opt Express. 2008 Dec 22;16(26):21505-11. doi: 10.1364/oe.16.021505.
We describe an efficient double-filtering method that uses a single acousto-optic tunable filter (AOTF) to improve the spectral resolution and intrinsic sidelobes for the spectral domain analysis systems. Double filtering with a single AOTF is realized by applying a unique feedback scheme based on the fact that incident light can be diffracted into two orthogonally polarized beams of light by an AOTF. Our theoretical explanation attempts to address and satisfy the main prerequisite for the proposed idea. The experimental results confirm that the proposed method achieves a 20% to 30% improvement in spectral resolution and 10 dB suppression of sidelobes with minimized light loss for the extraordinary incident light. We believe that the results of using an AOTF are comparable to the results achieved with two AOTFs in tandem.
我们描述了一种高效的双滤波方法，该方法使用单个声光可调滤波器（AOTF）来提高光谱域分析系统的光谱分辨率和固有旁瓣。通过应用基于AOTF可将入射光衍射为两束正交偏振光束这一事实的独特反馈方案，实现了使用单个AOTF进行双滤波。我们的理论解释试图解决并满足所提出想法的主要前提条件。实验结果证实，所提出的方法在光谱分辨率上提高了20%至30%，旁瓣抑制了10 dB，且对于异常入射光的光损失最小。我们认为，使用一个AOTF的结果与串联使用两个AOTF所取得的结果相当。
