SILICA GLASS MATERIAL HAVING SECOND ORDER OPTICAL NONLINEARITY AND ITS MANUFACTURING METHOD

摘要

Ge density of a core portion (10a) is greater than 12% and less than or equal to 30 mol%. The voltage to be applied in UV-excited poling is in a range of 1x105 to 8x105V/cm. With this arrangement, optical non-linearity of 2.5pm/V or more as an optical non-linearity constant d is imparted to SiO2-based glass material. As a result, an optical functional element, such as an optical switch, can be made using the glass material.