An innovative pump concept for diode-pumped, solid-state lasers is introduced as an example for an Er:YSGG laser, permitting its miniaturization. Embedded in a multireflective pump cavity, the laser crystal is simultaneously side and end pumped. Specially calculated and shaped deflecting optics distribute the coaxially input pumping light homogeneously over the lateral surface of the crystal, therefore reducing the size of the laser head, including the optical resonator, to a length of 27.5 mm and an outside diameter of 12.5 mm. The differential efficiency achieved is between 8.7% and 24%. The laser emits energy of 15.7 mJ at an absolute efficiency of 9.1% and a repetition rate of 4 Hz.
© 2004 Optical Society of America
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3500) Lasers and laser optics : Lasers, erbium
(140.5560) Lasers and laser optics : Pumping
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(220.4830) Optical design and fabrication : Systems design
Jörg Meister, Rene Franzen, Christian Apel, and Norbert Gutknecht, "Multireflection Pumping Concept for Miniaturized Diode-Pumped Solid-State Lasers," Appl. Opt. 43, 5864-5869 (2004)