He Tingchao, Wang Changshun, Pan Xu, Yang Hui, Lu Guoyuan
Department of Physics, Shanghai Jiao Tong University, Shanghai, China.
Opt Lett. 2009 Mar 1;34(5):665-7. doi: 10.1364/ol.34.000665.
A stilbene-containing fluorinated polyimide with high optical and thermal stability was prepared. The photoinduced anisotropy in this polyimide was investigated by measuring its dichroism and photoinduced birefringence. A large photoinduced birefringence (Deltan approximately 10(-2)) was achieved in the polymer. Stable and pure polarization phase gratings without surface-relief structure were written in the polymer film by using two orthogonally linearly or circularly polarized 532 nm beams. The polarization gratings were studied with a 650 nm probe beam by measuring the diffraction efficiency of the probe beam and surveying the conversion of the polarization state of the probe beam.
制备了一种具有高光学和热稳定性的含芪氟化聚酰亚胺。通过测量其二向色性和光致双折射来研究该聚酰亚胺中的光致各向异性。在该聚合物中实现了大的光致双折射（Δn约为10⁻²）。通过使用两束正交的线性或圆偏振532nm光束，在聚合物薄膜中写入了无表面起伏结构的稳定且纯的偏振相位光栅。通过测量探测光束的衍射效率并检测探测光束偏振态的转换，用650nm探测光束对偏振光栅进行了研究。
