Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstrasse 8, 79110 Freiburg, Germany.
Opt Lett. 2009 Dec 1;34(23):3659-61. doi: 10.1364/OL.34.003659.
We report what we believe to be the first realization of a computer-generated complex-valued hologram recorded in a single film of photoactive polymer. Complex-valued holograms give rise to a diffracted optical field with control over its amplitude and phase. The holograms are generated by a one-step direct laser writing process in which a spatial light modulator (SLM) is imaged onto a polymer film. Temporal modulation of the SLM during exposure controls both the strength of the induced birefringence and the orientation of the fast axis. We demonstrate that complex holograms can be used to impart arbitrary amplitude and phase profiles onto a beam and thereby open new possibilities in the control of optical beams.
我们报告了首例在单张光活性聚合物干板上记录的计算机生成的复值全息图，我们相信这是首例。复值全息图可产生具有振幅和相位可控性的衍射光场。全息图通过一步直接激光写入过程生成，其中空间光调制器（SLM）被成像到聚合物薄膜上。曝光过程中 SLM 的时间调制控制了所引起的双折射的强度和快轴的方向。我们证明，复值全息图可用于对光束赋予任意的振幅和相位分布，从而为光束控制开辟了新的可能性。
