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15 February 2012 Nonlinear optical properties of Er3+ ions doped TeO2-Li2O-WO3 glass by 800nm femtosecond laser excitation
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Abstract
Upconversion and nonlinear optical properties of the glasses have been studied. Optical band gap value 3.52eV calculated from the linear optical absorption measurement of the glass. The green upconversion emission of Er3+ ions from 2H11/24I15/2 to 4S3/24I15/2 transitions have been measured under femtosecond laser excitation of 100fs pulse at 80Mhz repetition at 800nm wavelength .Upcoversion emission intensity variation was observed on laser pump power from 50mW to 100mW and confirmed that two photon processes are involved at lower pump power . The nonlinear absorption has been measured by z-scan measurements using 100fs laser pulse and optical nonlinearity of the glass was calculated. The relationship between the nonlinear optical properties and the glass structures estimated by Raman spectroscopy was discussed. The nonlinearity of these TWL glasses increased as the stretching Raman band of TeO4increased, while the stretching band of TeO3 decreased. This indicate that amount of TeO4 units was deeply related to the third order non-linearity.
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Ghizal F. Ansari, S. K. Mahajan, and J. Parashar "Nonlinear optical properties of Er3+ ions doped TeO2-Li2O-WO3 glass by 800nm femtosecond laser excitation", Proc. SPIE 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI, 82401L (15 February 2012); https://doi.org/10.1117/12.908085
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