Construction of Rea-Ltime Phase Conjugate Interferometer Using Dye-Doped Films

本文研究了用染料掺杂聚合物薄膜构建实时相位共轭干涉仪并对其进行了评价。该干涉仪由ar离子激光器作为光源，简并四波混频（DFWM）干涉仪组成。它使用一个相位共轭器和一个传感部分。整个系统设置在隔振光学台上。该相位共轭干涉仪具有两种功能：实时感知两个物体之间的相位差和幅值差，或实时感知一个物体的时间变化。由于这两种功能，除了传统的实时干涉测量之外，还可以进行边缘增强、缺陷检测等。为了使这样的操作成为可能，要求染料掺杂薄膜。有：(1)由于DFWM过程中不仅有相位共轭波，而且有记录的干涉条纹不发育，因此可以产生相位共轭波；(2)前、后相位共轭信号的极化状态与输入探测波的极化状态相同。分别读出泵波。一种烘烤红血素b掺杂PVA薄膜适合于此目的。由于DFWM过程，相位共轭信号的上升时间为-lmsec。，反射率-1%为。得到在515nm处的泵浦功率为-1w/cm^2。我们实验室制备的薄膜尺寸为5cm × 10cm，厚度为50 μ m-100 μ m。经验证，该相位共轭干涉仪工作良好。用甲基橙掺杂PVA薄膜作为相位共轭剂。可以进行过滤。

The present work is concerned with a construction of a real-time phase conjugate interferometer using dye-doped polymer films and its evaluation. This interferometer consists of an Ar-ion laser as a light source, an interferometer of degenerate four-wave mixing (DFWM) configuration. which uses a phase conjugator, and a sensing part. The whole system is set on a vibration-isolated optical table. This phase conjugate interferometer has two kinds of functions : a real-time sensing of the phase difference and amplitude difference between two objects or in temporal variation in an object. Owing to both functions, an edge enhancement, a defect detection and so on also can be performed in addition to traditional real-time interferometry.In order to make possible such operations, the requirements for the dye-doped film. are : (1) it can generate phase conjugate waves due to not only the DFWM process but also a recorded interference fringe without development and (2) the polarization states of the former and latter phase conjugate signals are the same as those of the input probe wave and the. read-out pump wave, respectively.A baked erythrosin-B-doped PVA film was suitable for this purpose. The rising time of the phase conjugate signal due to the DFWM process was-lmsec., and the refrectivity of-1% was. obtained at 515nm for the pump power of-1w/cm^2. The films prepared in our laboratory had 5cm x 10cm in size and 50 mu m-100 um m in thickness.This phase conjugate interferometer was verified to work well. With a methyl-orange doped PVA film as a phase conjugator a. novelty. filtering can be performed.