Patent ID: 8243765
Filing Date: 2012-08-14
Classification: G02F,H01S

Abstract:
1. Optical apparatus, comprising: first and second resonators having first and second portions with the first resonator portions being coaxial and the second portions separate; an OPS-structure located in the second portion of the first resonator; a light source for delivering optical pump radiation to the OPS-structure such that laser radiation having a fundamental wavelength circulates in the first resonator; a first optically nonlinear crystal located in the coaxial first portions of the first and second resonators and arranged for optical parametric division of a portion of the fundamental wavelength radiation into signal radiation and idler radiation portions, the signal radiation portion having a wavelength greater than the wavelength of the fundamental-wavelength radiation and less than the wavelength of the idler radiation portion; an optical arrangement for directing the signal radiation into the second portion of the second resonator such that signal radiation circulates in the second resonator; and a second optically nonlinear crystal located in the second resonator, the second optically nonlinear crystal being arranged for frequency-converting circulating signal radiation to a wavelength shorter than the wavelength of the circulating fundamental wavelength radiation.