Abstract
Laser action of the photo-thermo-refractive (PTR) glass, which is the photosensitive material for holographic recording of volume Bragg gratings (VBGs), was demonstrated for the first time by introducing . Nd:PTR glass has a bandwidth of and for luminescence and absorption, respectively. An uncoated thick Nd:PTR element generated cw laser output of , with a slope efficiency of 25%, by laser diode pumping. This Nd:PTR glass also performed wide bandwidth laser action at , where the decrease of the pump-absorption efficiency was held off below 30%, even under a shift of pump wavelength from its absorption center.
© 2011 Optical Society of America
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