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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 5: Optical Methods

K 5.2: Vortrag

Donnerstag, 5. März 2026, 11:30–11:45, HS 20

Nonlinear absorption and lasing properties of Rhodamine-110 dye composites using a 532 nanosecond laser — •Abeer Salah, Elham M. Mostafa, Randa Saad Hassan, and Ahmed M. Saad for the Z Scan Abeer Salah collaboration — National Institute of Laser Enhanced Sciences, Cairo University, Egypt

Rhodamine 110 (Rh-110) is a xanthene-based fluorescent dye that has garnered significant attention in scientific and industrial communities. The linear and nonlinear optical properties of the laser dye Rhodamine 110 in an ethanol solvent at various concentrations, ranging from 2 mM to 0.001 mM, were studied. The maximum lasing was observed at 1 mM via 532 nm pumping; the absorption and emission wavelengths were found to be 501 nm and 522 nm, respectively. RH-110 was polymerized in methyl methacrylate MMA, Glycidyl Methacrylate GMA, and GMA-MMA polymer matrices. The absorption and emission are slightly shifted compared to the liquid samples. The absorptivity, oscillator strengths, and emission cross sections were calculated. Observations indicate apparent concentration-dependent variations in spectral features, which is correlated with nonlinear optical measurements. Nonlinear absorption was carried out via a Z-scan using 532 nm nanosecond pulses. The measurements reveal saturable absorption, which provides an explanation for the lasing behavior of the Rh-100 series. The GMA-MMA dyes exhibit enhanced nonlinearity compared to GMA or MMA alone. The composite RH110 can be utilized in photonic devices due to its nonlinear optical properties.

Keywords: Lasing threshold; Z scan; lifetime; Saturable absorption