Abstract:

The thermal expansion coefficient of PWO crystals grown by Bridgman technology was measuredand its effects on the cracking of the crystals were discussed. The approach of overcoming the crack wasalso investigated. It was shown that the strains resulted from temperature distribution along the longitudeduring manufacture, and the large thermal expansion coefficient with tlie maked anisotropy of the crystalsare the important reason of the cracking.

Key words: lead tungstate crystal, Bridgman technology, thermal expansion coeffident, crystal crack