Temperature stable solid-state laser package

A solid-state laser package comprising

• a heat sink,
• a thermo-electric cooler mounted on said heat sink,
• a thermally conductive, low thermal expansion, base plate mounted on said thermo-electric cooler, said base plate having a substantially planar top major surface,
• a thermally conductive, low thermal expansion, block on said top major surface of said base plate, said block having a groove formed in a top surface thereof,
• a laser diode means mounted to said base plate in alignment with said groove for producing a first laser beam with a thermally tunable first wavelength, said first laser beam directed along said groove,
• a solid material laser active medium mounted in said groove in said block in alignment with said first laser beam, said first wavelength of said first laser beam matching an absorption band of said active medium when said laser diode means is at a particular operating temperature,
• at least one lens mounted in said groove between said laser diode means and said active medium for directing said first laser beam into said active medium through an end of said active medium, whereby said active medium generates light under lasing conditions with a second wavelength,
• first and second cavity mirrors, a first mirror being a curved reflective coating on an end of said active medium in said groove between said at least one lens and said active medium, a second mirror being planar and mounted on said base plate perpendicular to the length of said groove with said active medium being between said first and second cavity mirrors,
• a transparent biplanar plate mounted on said base plate between said active medium and said second cavity mirror and oriented at a Brewster angle with respect to the length of said groove,
• an optical isolator mounted on said base plate in a path of a second solid state laser beam output emitted through said second cavity mirror,
• means for measuring a temperature of said base plate, and
• temperature stabilizing means, responsive to said temperature measuring means, for adjusting an electric current applied to said thermo-electric cooler to vary the rate of heat flow between said base plate and said heat sink so as to maintain said temperature of said base plate at said operating temperature, whereby an initial alignment of said laser diode means, at least one lens, active medium, cavity mirrors, transparent Brewster angle plate and optical isolator is maintained.