Digital inline holography (DIH) provides instantaneous three-dimensional (3D) measurements of diffracting objects; however, phase disturbances in the beam path can distort the imaging. In this Letter, a phase conjugate digital inline holography (PCDIH) configuration is proposed for removal of phase disturbances. Brillouin-enhanced four-wave mixing produces a phase conjugate signal that back propagates along the DIH beam path. The results demonstrate the removal of distortions caused by gas-phase shocks to recover 3D images of diffracting objects.

中文翻译：

---

相位共轭数字在线全息术（PCDIH）

数字在线全息术（DIH）提供了衍射物体的瞬时三维（3D）测量；但是，光束路径中的相位干扰会使成像失真。在这封信中，提出了一种相位共轭数字在线全息术（PCDIH）配置，用于消除相位干扰。布里渊增强的四波混频产生相位共轭信号，该信号沿DIH光束路径反向传播。结果表明，消除了由气相冲击引起的畸变，可以恢复衍射物体的3D图像。