Patent ID: 7505491
Filing Date: 2009-03-17
Classification: G02F,H01S

Abstract:
1. A laser, comprising: a laser-resonator having first, second, and third branches; at least one gain-element located in the third branch of the resonator; an arrangement for optically pumping the gain-element such that laser radiation having a fundamental wavelength circulates in the laser-resonator; one or more polarization-selective devices optically connecting the first and second branches of the resonator to the third branch of the resonator, the polarization-selective devices and the laser-resonator being arranged such that fundamental-wavelength radiation in the first and second resonator-branches is polarized in respectively first and second orientations perpendicular to each other; and at least one optically nonlinear crystal located in the first branch of the resonator and arranged to convert a portion of the fundamental-wavelength radiation to frequency-converted radiation having a wavelength different from the fundamental wavelength.