| 摘要 |
<p>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 105 - 8 x 105 V/cm. Thus, SiO¿2? glass material has a nonlinear optical constant d of not less than 2.5 pm/V. Therefore, an optical functional device such as an optical switch can be made of the glass material.</p> |
