| 摘要 |
PURPOSE:To improve the efficiency of optical pumping, and to increase an output by applying irradiation light to an optical conversion means composed of a semiconductor, generating fluorescence and optically pumping a laser active substance in a laser medium by the fluorescence. CONSTITUTION:An optical conversion means 10 consisting of a semiconductor absorbing irradiation light 1R and generating fluorescence having a wavelength proper to the optical pumping of a laser active substance is provided, and irradiation light 1R is applied to the optical conversion means 10 and the laser active substance in a laser medium 1 is optically pumped while using fluorescence generated from the optical conversion means 10 as excitation light EL. Not only a wavelength component within a wavelength range having the excellent efficiency of the optical pumping of the laser active substance in irradiation light but also a wavelength component within a wavelength range shorter than the wavelength component are absorbed by previously conforming the wavelength of fluorescence emitted from the optical conversion means 10 within the wavelength range having the excellent efficiency of the optical pumping of the laser active substance, and the wavelength, component which has not been used is utilized effectively for optically pumping the laser active substance. Accordingly, the efficiency of optical pumping is improved, and a large output can be acquired. |
