| 摘要 |
<p>A method and apparatus for wavelength conversion of coherent light which can prevent optical destruction of a wavelength conversion element (14) and achieve a high wavelength conversion efficiency. The apparatus for wavelength conversion of coherent lights in the present invention has an optical focusing system for focusing the input coherent light on the wavelength conversion element in an optical cavity (15), which optical focusing system makes the cross-sectional shape of a light beam non-circular, preferably, elliptical. <IMAGE></p> |
