Abstract
If the pump radiation is strongly absorbed in the laser material, end-pumping of solid-state lasers can lead to high efficiency as a result of the good mode overlap between the solid-state laser and the diode-laser pump. Weak absorption of the diode-laser radiation can result from the use of a very short solid-state laser cavity for single-mode operation,1 inherently weak absorption2 in the laser material at the wavelengths of available pump lasers, or low laser ion concentration in the host material. Weak absorption in quasi-three-level lasers can also result if short laser crystals or low-concentration material are used to reduce the reabsorption loss.3,4 Some method of increasing the total absorption of pump light is desired to increase the overall efficiency of laser systems with weak single-pass absorption.
© 1991 Optical Society of America
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