It is known that due to absence of uniform crystalline structure in Nd-doped glasses (comparing to Nd:YAG and Nd:YVO4 crystals) energy levels of Nd+ are significantly broadened.
This means that we have broadened absorption and emission peaks. Broadened absorption peak seems favorable, as it allows us better utilize energy of flash lamps or diode sources.
But we still have wide emission peak (up to 30nm wide). What happens when 1065nm photon reaches excited atom ready to emit 1055nm and vice-versa? I understand that excess energy will go to heat/be extracted from heat, but what is typical gain bandwidth we can completely deplete in single-frequency laser?
Are we doomed to have super-wide emission spectra from Nd:glass laser or have terrible efficiency when trying to make it narrow-bandwidth (or even single-frequency) by missing energy levels of 99% of excited atoms? Will we be able to excite 100% of Nd+ atoms in Nd:silica glass using 808nm laser, or only small fraction of them which happen to have their individual absorption peak overlaping 808nm laser emission (which is ~2nm wide)?
So to recap: Can someone clarify how does Nd:silica glass behave when a) pumped by narrow-band source, like 808nm laser b) excited in single-frequency laser with narrow-band pumping c) excited in single-frequency laser with wide-band pumping (flashlamp)