Abstract: A nonlinear optical device having a yttrium-aluminum-garnet or yttrium-lithium-fluoride laser rod for producing radiation of a fundamental wavelength, a first mirror located in front of the laser rod along the longitudinal axis of the laser rod reflective of the radiation of the fundamental wavelength but transmissive of radiation of a desired harmonic wavelength, a second mirror located to the rear of the laser rod along the longitudinal axis of the laser rod reflective of radiation of the fundamental wavelength, a phase matched crystal harmonic wavelength generator mounted on a movable platform driven by a motor arranged between the front mirror and the laser rod responsive to radiation of the fundamental wavelength for generating radiation of the desired harmonic wavelength, an output sensor arranged in front of the first mirror for generating a signal indicative of the output power of the laser rod, a beamsplitter for directing a portion of the laser rod output power to the output sensor and a computer fo

Abstract: A linear cavity laser system having a yttrium-aluminum-garnet laser rod for producing a fundamental wavelength of radiation having a front face and a longitudinal axis, a first mirror reflective of the fundamental wavelength but transmissive of a desired harmonic wavelength located in front of the laser rod along the longitudinal axis, a second mirror reflective of both the fundamental wavelength and the desired harmonic wavelength located to a rear of the lasing rod along the longitudinal axis, a phase matched crystal harmonic wavelength generator responsive to the fundamental wavelength for generating the desired harmonic wavelength of radiation arranged between the front mirror and the lasing rod along the longitudinal axis and a dichroic member transmissive of the fundamental wavelength but reflective of the harmonic wavelength arranged between the laser rod and the harmonic wavelength generator along the longitudinal axis.