Spectral and laser studies on energy transfer binary dye-doped polymer laser rods

Bamini, N Sesha; Ramalingam, A.; Gowri, Vijayendran; Rekha, R.

doi:10.1080/09500340802267175

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Different solid-state materials like polymers, organic semiconductors, zeolites, sol–gel, and NLO crystals have been used as host media for organic laser dyes. These studies are aimed at the fabrication of dye-doped single-crystal microlasers. − …”

Section: Introductionmentioning

confidence: 99%

New Nonlinear Optical Crystal of Rhodamine 590 Acid Phthalate

et al. 2020

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The synthesis and crystal structure of rhodamine 590 acid phthalate (RhAP) have been reported. This novel solid-state rhodamine derivative not only has a longer fluorescence lifetime compared to rhodamine solid-state matrixes where emission is quenched but also possesses strong nonlinear optical characteristics. The static and dynamic first- and second-order hyperpolarizabilities were calculated using the time-dependent density functional theory at the B3LYP/6-31+G* level. The computed static values of β and γ of RhAP by the X-ray diffraction (XRD) structure were 31.9 × 10 –30 and 199.0 × 10 –36 esu, respectively. These values were about 62 times larger than the corresponding values in urea, an already well-known nonlinear optical material. The second-order hyperpolarizability of the compound was determined experimentally by measuring the two-photon absorption cross section using intensity-modulated light fields. The reported compound, excitable at near-infrared, exhibited frequency upconversion with the two-photon absorption coefficient enhanced by two orders of magnitude compared to that of the dye solution. Hosting the dye in the solid, at high concentrations, exploits the nonlinearity of the dye itself as well as results in significant excitonic effects including formation of broad exciton band and superradiance.

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