We report measurements on flashlamp pumped YAG crystals doped with chromium, thulium and holmium. Near room temperature laser operation on the 2.1 μm holmium transitions was characterized using a frequency selective resonator. Small signal gain and stored energy lifetimes were analyzed to determine the strength and dependence of loss mechanisms. Analysis of thermal lensing experiments demonstrated a high degree of excess heat generation in this material.

© 1991 Optical Society of America

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