Abstract

The thermal expansion coefficient and dn/dT are measured by interferometry techniques in undoped YAG below 300 K. The thermal expansion coefficient at 125 K is measured to be 2.70 × 10-6 K-1 and dn/dT at 633 nm is 2.5 × 10-6 K-1, compared with 7 × 10-6 K-1 and 9 × 10-6 K-1 for these quantities at 300 K.

© 1999 Optical Society of America

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