Stimulated Raman scattering influenced by concentration, fluorescence profile and bandwidth of β‐carotene in liquid‐core optical fiber

Abstract

We demonstrated stimulated Raman scattering (SRS) of carbon disulfide (CS 2 ) influenced by β-carotene in a liquid-core optical fiber (LCOF). Owing to the double fluorescence characteristics and large third-order optical nonlinearity of β-carotene, the high-order Stokes lines, such as the seventh-order Stokes line of CS 2 , can be observed at a relatively low input-laser power. The thresholds of Stokes lines lowered with the addition of the carotenoid when the concentration of solution was within 10 −12 and 10 −7 mol/L; the threshold increments and intensities of Stokes lines were correlative with the fluorescence profile of β-carotene: when the fluorescence intensity of the wavenumber region on the spectrum was high, the Stokes line intensity was also high and its threshold increment was small, and vice versa. These results are expected to be worthy of the applications on the tunable laser and the seeding laser.

Enhanced stimulated Raman scattering by intermolecular Fermi resonance

“…The facture of the LCOF is shown by previous papers [19][20][21]. The experimental setup is shown elsewhere [13].…”

“…In order to lower the threshold of SRS and enhance the intensity of SRS, some methods are applied, such as fluorescent dyes to enhance the SRS [7], micrometer-sized droplets to enhance the SRS [8,9], liquid-core optical fibers (LCOFs) to enhance the SRS [10], intramolecular Fermi resonance to enhance the SRS [11] and so on. The fluorescent dye enhancement to SRS in a LCOF has been investigated by our team in the last few years [12,13]. But the intermolecular Fermi resonance to enhance the SRS has not been researched as far as we know.…”

Continuous wave stimulated Raman scattering of benzene by fluorescence enhancement in hollow fused silica fiber

“…[16] The experimental setup is given elsewhere. [17] For excitation, two semiconductor lasers were used that emit at 658 and 532 nm. The laser power was in a range of 0-1 W and 0-30 mW, respectively.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part IV

“…Lorono et al [138] reported high-resolution SRS and analysis of the overtone symmetric motion of C 2 H 4 . Men et al [139] showed that the SRS of CS 2 is influenced by β-carotene in a liquid-core optical fiber. Their results are expected to be useful for applications involving tunable as well as seeding lasers.…”