Efficient molecular photorefractive materials based on methine dyes

Wang, Liming; Ng, Man-Kit; Yu, Luping
February 2001
Applied Physics Letters;2/5/2001, Vol. 78 Issue 6, p700
Academic Journal
This letter reports a series of molecular materials that shows efficient photorefractive effect. The materials which consist of monolithic methine dye molecules can form amorphous films. A net photorefractive gain of 215 cm-1 and a diffraction efficiency of 87.6% at a semiconductor laser wavelength of 780 nm are observed. These materials are the simplest molecular materials and possess the best photorefractive performances. Due to the large photorefractive effect, optical self-defocusing and instability of the laser beam are observed in these materials when the applied electric field is above a threshold. © 2001 American Institute of Physics.


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