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

摘要

The Ge concentration in a core part (10a) is higher than 12 mol.% and not higher than 30 mol.%. The voltage which is applied at the time of ultraviolet radiation excitation polling is within a range of 1 x 10 5 - 8 x 10 5 V/cm. Thus, SiO2 glass material has a nonlinear optical constant d of not less than 2.5 pm/V. Therefore, an optical function al device such as an optical switch can be made of the glass material.