Designing novel chalcone single crystals with ultrafast nonlinear optical responses and large multi-photon absorption coefficients |
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Affiliation: | 1. Division of Energy Systems Research, Ajou University, Suwon 443-749, Republic of Korea;2. Department of Physics, Mangalore University, Karnataka 574 199, India;3. Division of Electrical and Computer Engineering, Ajou University, Suwon 443-749, Republic of Korea |
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Abstract: | A chalcone single crystal, 1-(4-chlorophenyl)-3-(4-methoxyphenyl)prop-2-en-1-one that is transparent over the visible to infrared region is introduced as a new potential material to third-order nonlinear optical applications. The crystal exhibits ultrafast optical response (≤90 fs) and large optical nonlinearity in the wavelength range 800–1200 nm. A very large effective two-photon absorption coefficient βeff exceeding 120 cm/GW can be obtained with this chalcone crystal, at a low intensity threshold of 41 MW/cm2. The mechanism of nonlinear absorption at different levels of intensity has been discussed. The crystal shows no damage against the laser pulse intensity as high as 8 GW/cm2. We discuss the molecular and crystal designing of chalcones with large and ultrafast optical nonlinearity combined with low optical cut-off (<450 nm). |
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