Characterization and Characteristics of a ULE~(~R) Glass Tailored for the EUVL Needs

摘要

The EUVL industry has unique material requirements, which are being addressed. Implementation of metrology methods new to ULE~(~R)Glass will be discussed along with material characteristics altered to meet the needs of EUVL. Metrology methods include multiple means of evaluating the striae, CTE and inclusions. Material characteristics have been altered to better meet the demands of the industry. The reduction in inclusion levels along with other improvements such as in the area of striae will be discussed here. Improvements of greater than 4x were achieved in these preliminary striae reduction trials.