Quartz glass with low content of hydroxyl and high purity and method for preparing the same

A method for preparing quartz glass with low content of hydroxyl and high purity, comprising:

• preparing silica powders, the silica powders comprising hydroxyl groups;
• dehydroxylating the silica powders, comprising:
• adjusting a temperature of a furnace to a first temperature and drying the silica powders in the furnace at the first temperature;
• raising the temperature of the furnace up to a second temperature and introducing a first oxidizing gas comprising halogen gas into the furnace, a total mass of the introduced first oxidizing gas being within 1% of a total mass of the silica powders, thereby heating the silica powers at the second temperature and obtaining first dehydroxylated powders;
• raising the temperature of the furnace up to a third temperature and introducing a second oxidizing gas comprising oxygen or ozone into the furnace, thereby heating the silica powers at the third temperature and obtaining second dehydroxylated powders;
• heating the second dehydroxylated powders up to a fourth temperature to vitrify the second dehydroxylated powders, thereby obtaining a vitrified body;
• and
• cooling the vitrified body to obtain the quartz glass.