High-power, diode-pumped solid state (DPSS) pulsed lasers are preferred
for applications such as micromachining, via drilling of integrated
circuits, and ultraviolet (UV) conversion. Nd:YVO.sub.4 (vanadate) lasers
are good candidates for high power applications because they feature a
high energy absorption coefficient over a wide bandwidth of pumping
wavelengths. However, vanadate has poor thermo-mechanical properties, in
that the material is stiff and fractures easily when thermally stressed.
By optimizing laser parameters and selecting pumping wavelengths and
doping a concentration of the gain medium to control the absorption
coefficient less than 2 cm.sup.-1 such as the pumping wavelength between
about 910 nm and about 920 nm, a doped vanadate laser may be enhanced to
produce as much as 100 W of output power without fracturing the crystal
material, while delivering a 40% reduction in thermal lensing.