A barium fluorosilicate glass fiber, when pumped in the infrared, exhibits powerful green surface-like defect luminescence whose intensity is a strong function of temperature. Optical thermometry over the range from 25°C-130°C is demonstrated.

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A barium fluorosilicate glass fiber, when pumped in the infrared, exhibits powerful green luminescence whose intensity maintains a Pekarian-lineshape. Combined with correlated Raman spectroscopy, oxygen-excess surface defects are suggested as the origin.

All glass optical fibers drawn from crystalline precursors via the molten core method demonstrate instantaneous and greatly enhanced second harmonic generation. Results when pumping in the NIR at relatively low powers (< 1W) are presented.

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