Polarization dependent two-photon properties in an organic crystal

Hong-Hua Fang; Jie Yang; Ran Ding; Qi-Dai Chen; Lei Wang; Hong Xia; Jing Feng; Yu-Guang Ma; Hong-Bo Sun
September 2010
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p101101
Academic Journal
The dependence of the fluorescence on the excitation beam polarization under two-photon excitation was studied in a 1,4-bis(R-cyano-4-diphenylaminostyryl)-2,5-diphenylbenzene organic crystal. The crystal shows strong response to the polarization, especially when the pump intensity was increased. The polarization plays an important role on the threshold of amplified spontaneous emission (ASE) and the ΔGASE under two-photon excitation (TPE). Moreover, the polarization distribution between the TPE (800 nm) and one-photon excitation (400 nm) are very different. The former generates a cos4 θ distribution, while the later gives rise to cos2 θ distribution in different orientation.


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