Patent ID: 8824521

Claim:
A solid laser apparatus wherein the solid laser apparatus comprises: two reflection elements for forming an oscillator; a plate-shaped gain medium being disposed between said two reflection elements, thereby augmenting a stimulated emission light in a thickness-wise direction; a doughnut- or deformed-doughnut-type planar waveguide being disposed so as to make an inner peripheral face thereof come in contact with an outer peripheral face of said plate-shaped gain medium; and a plurality of excited-light sources being directed in five or more directions, the excited-light sources being coupled to an outer peripheral face of said doughnut- or deformed-doughnut-type planar waveguide so as to make excited lights propagate from the outer peripheral face of said doughnut- or deformed-doughnut-type planar waveguide to said plate-shaped gain medium; wherein the excited lights coming from said plurality of excited-light sources being directed in five or more directions are caused to fall on the outer peripheral face of said doughnut- or deformed-doughnut-type planar waveguide at such an angle that turns a space distribution of absorption intensities of said excited lights resulting from said plate-shaped gain medium into a shape of doughnut distribution that approximates a TEM01 mode.