Study of second-order nonlinear hyperpolarisability of all-trans-β-carotene in solutions by linear spectroscopic technique

Abstract

This paper demonstrates the second-order nonlinear hyperpolarisability γ of all-trans-β-carotene in different solvents by linear spectroscopic technique that is based on resonance Raman scattering and UV–VIS (Ultraviolet-visible) absorption spectroscopy. Owing to the two-level model well describing the link that exists between the resonance Raman scattering and stimulated Raman scattering, the stimulated Raman polarisability αR can be calculated through the two-photon resonance system. The value of γ of all-trans-β-carotene in carbon bisulfide solution is 6.435 × 10−33 esu (1 esu of resistance = 8.98755 × 1011 ω) that is close to the true value, because the solution of all-trans-β-carotene in carbon bisulfide satisfies the rigid resonance Raman scattering condition. This method is expected to be worthy of applications to measure the second-order nonlinear hyperpolarisability of a conjugate organic molecule.

Multifrequency stimulated Raman scattering in ethanol under picosecond laser excitation

“…It was shown in [11] that, under picosecond laser excitation with a wavelength of 532 nm, two Stokes and one anti-Stokes components are observed in the SRS. In [12][13][14][15], SRS was studied in ethanol microdroplets with the addition of Rhodamine 6G. It is shown that the laser generation of Rhodamine 6G is partially compressed due to SRS in ethanol.…”

External Field Effect on Electronic and Vibrational Properties of Carotenoids

“…Many organic thin films have been fabricated and their physical properties have been examined in order to develop fine nonlinear optical devices. Carotenoids, although due to their poor structural stability, can be a good model to investigate because of their large nonlinear optical susceptibilities [9][10][11][12]. Different types of β-Car thin-films were fabricated, and their optical absorption and resonance Raman spectroscopy were examined.…”