Abstract

ABSTRACT The performance (in tenns of output power and slope efficiency) of the passively Q-switched Nd:YAG and Nd:YVO4lasers, both side pumped and endpumped, will be reported and compared to our theoretical model. Passive Qswitchoperation by a Cr:GGG element as a saturable absorber was studied in terms of pulse frequency as a function ofpump power. Keywords: CW lasers, Qswitched lasers, Neodymium:solid lasers, Optical pumping, Laser excitation, Laser thermal factors. 1. INTRODUCTIONDiode pumped solid state lasers based on Nd doped crystals such as YAG and YVO4 have been extensively developed and are now available as compact, efficient sources both in the 1.06 jtm and in the frequency doubledwavelength of 532 nm a. They are employed for various scientific, medical and military applications, wherecompact, reliable, stable, and highly efficient sources are desirable. Passively Q-switched devices using inorganicdoped ions such as Cr -doped garnets have an added value in this respect.The matching between the pump mode, and the fundamental cavity modes plays an important role in the laserperformance. Currently, the methods used to diode pumping are longitudinal pumping, with optical efficienciesabove 50% and side pumping , which has the potential of scaling for high power operation by adding up pumpingelements in various configurations along the laser rod '.

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