High homogeneity silica glass prepared through a sol-gel procedure

A silica glass characterized by the following specific properties:

• a) light internal transmittance in the wave length between 185 nm and 193 nm higher than 85%;
• b) light internal transmittance in the wave length between 193 nm and 2600 nm higher than 99.5%;
• c) light internal transmittance in the wave length between 2600 nm and 2730 nm higher than 99%;
• d) light internal transmittance in the wave length between 2730 nm and 3200 nm higher than 85%;
• e) no streak, material of class 4 or better according to the rule DIN ISO 10110-4;
• f) no strip;
• g) no signal in the shadography (no shadow or intensity change);
• and wherein said silica glass is made by a sol gel process.