Pump steering mirror cavity

Claim 1

A singly resonant tunable optical parametric oscillator comprising: an oscillator resonant cavity; first and second resonant cavity mirrors defining opposite ends of said cavity, said cavity having an optical axis extending between said mirrors; a nonlinear optical crystal mounted for rotation in said cavity between said resonant cavity mirrors and lying on said axis, said optical crystal being rotatable about a crystalline axis perpendicular to said cavity axis for tuning said oscillator; first and second pump steering mirrors in said cavity, said first pump steering mirror being positioned on said cavity axis between said first resonant cavity mirror and a first end of said crystal, said second pump steering mirror being positioned on said cavity axis between said second resonant cavity mirror and a second end of said crystal; a laser pumping source directing a pump beam of pulses into said cavity, said pump beam being incident on said first pump steering mirror and being deflected thereby into and through said crystal to said second pump steering mirror, said second pump steering mirror directing said pump beam out of said cavity, said pump beam having a wavelength and power sufficient to produce parametric luminescence in said crystal which is emitted therefrom as parametrically generated signal and idler output beams of light having wavelengths dependent upon the rotational position of said crystal with respect to said optical axis; and wherein said resonant cavity mirrors each have a transmittance spectrum which produces substantial reflectance and some transmittance at the wavelengths of a selected one of said parametrically generated output beams to produce singly resonant oscillation in said cavity and to permit light having said selected parametrically generated wavelength to be emitted from the cavity.