Photorefractivity and transmission-type holograms of a poly(N-vinylcarbazole)-based composite with N-4-nitrophenyl-(l)-prolinol as chromophore
✍ Scribed by Peng Wang; Zhiming Feng; Youming Chang; Cheng Ye; Feng Wang; Qihuang Gong
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 139 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The photorefractivity of a poly(N-vinylcarbazole)/2,4,7-trinitro-9-fluorenone/N-4-nitrophenyl-(l)-prolinol/N-ethylcarbazole composite was investigated by twobeam coupling and degenerate four-wave mixing experiments. The composite in a weight ratio 35 : 1 : 50 : 15 exhibited a 22% steady-state diffraction efficiency and 70 cm Ϫ1 two-beam coupling coefficient at the applied external field of 55 V/m. Zero applied field transmission-type holograms were observed in the photorefractive sample as well as the spin-coated thin film. The dynamic decay of diffraction light indicated that there existed two contributors with different phase-shift, and the slow decay time can be as long as several h under continuous illumination by the readout beam.