Patent ID: 7260124

Claim:
A laser apparatus, comprising: a laser gain medium, an excitation means coupled with the gain medium for pumping the gain medium, a cavity forming means surrounding the gain medium to form a resonate laser cavity, a harmonic generator capable of doubling the frequency of said radiation, said harmonic generator being a crystal having the general chemical formula Re1 x Re2 y Ca 4 (BO 3 ) 3 O, wherein Re1 is Gd and Re2 is Lanthanum; and x ranges from greater than 0 to about 0.7, y=1−x, and x+v=1; and wherein said Re1 and Re2, are manipulated in a predetermined fashion during the growth process of the crystal so as to modify the principle birefringence plane of said crystal and enable noncritical phase-matching for harmonic generation, and an energy extraction means in the cavity forming means to remove laser energy from the cavity.