Patent ID: 7633978
Filing Date: 2009-12-15
Classification: H01S

Abstract:
1. A laser arrangement, comprising: a pump source for providing optical pumping radiation; a first and a second cavity end mirror forming a resonant optical cavity; an optically pumpable gain material located in said resonant optical cavity, said gain material being capable of emitting fundamental coherent radiation at a fundamental wavelength when optically pumped by said pumping radiation; a birefringent, nonlinear element capable of converting the frequency of said fundamental radiation; a polarizing element structured and arranged to provide low losses for light of a predetermined polarization state oscillating within the resonant cavity; and a folding mirror defining a first and a second branch for said resonant optical cavity; wherein said polarizing element and said folding mirror are arranged on opposite sides of the birefringent, nonlinear element, and wherein the polarizing element is arranged between the birefringent, nonlinrear element and one of the cavity end mirrors in a branch of the resonant optical cavity other than the branch containing the gain material.