24.4 W of laser output has been obtained by sun-pumped, Cr-codoped Nd:yttrium
aluminum garnet ceramic. The water-cooled laser rod was pumped with a Fresnel lens focusing
the natural sunlight. By using the advantages of the Fresnel lenses, the maximum output for
unit area of sunlight was 18.7 W/m2. Direct concentrated solar illumination was used to pump a
9mm-diameter, 100mm length rod of Cr:Nd:YAG, which was obtained 9%–14% slope
efficiency for the laser output. We have analyzed the Cr:YAG laser medium and found it to be
an excellent high-power laser candidate for direct solar-pumping schemes which enhances the
laser output about 1.8 times more than Nd:YAG.
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