Abstract
Diode laser pumping of solid state lasers can provide high conversion efficiency to the TEM0o mode when the emission from the pump source is concentrated in the desired lasing volume within the active medium. This manner of mode matched pumping is best illustrated by diode array end pumped designs which typically provide >30% slope efficiency to the TEM0o mode.1 Higher power schemes utilizing diode bars have employed side pumped geometries which are not well mode matched resulting in TEM0Q slope efficiencies of typically 10-15 % .2 We discuss a new solid state laser design using a tightly folded resonator (TFR) approach which provides a laser geometry mode matched to a diode bar resulting in diffraction-limited output powers of several watts and slope efficiencies of over 40 %.
© 1989 Optical Society of America
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