Two-photon absorption in diacrylate mesogens at 632.8 nm wavelength
Department of Photonics, National Sun Yat-Sen University - 70 Lienhai Road, Kaohsiung 80424, Taiwan, ROC
Accepted: 20 December 2010
Two-photon absorption has been observed in diacrylate mesogens for a low-power continuous laser irradiation at 632.8 nm wavelength. The two-photon absorption coefficients for the mesogens in different phases are determined, and found to be very large. In the isotropic state, the two-photon absorption coefficients of diacrylate mesogen RM257 can reach (4.36 ±0.49)×10−4 cm/mW. A larger two-photon absorption coefficient ((5.20 ±0.59)×10−4 cm/mW) has been observed in the nematic phase RM257.
PACS: 33.80.Wz – Other multiphoton processes / 61.30.Vx – Polymer liquid crystals / 42.70.Gi – Light-sensitive materials
© EPLA, 2011