| 摘要 |
<p>An optical member includes a fused silica glass having a concentration of SiH moiety below detection limit as measured by Raman spectroscopy and a concentration of molecular hydrogen of at least 1 x 1017 molecules/cm3. The fused silica glass exhibits an induced absorption level which quickly attains an initial peak upon exposure to irradiation and rapidly decays to a low value. The induced absorption level after decaying to the low value remains substantially unchanged by further irradiation.</p> |
