Potassium-(rare-earth)-double tungstates doped with rare-earth ions [R:KRe(WO4)2, shortly KReW, Re = Gd, Lu,Y are “passive” ions while R = Nd,Yb,Tm,Ho etc. are active trivalent rare-earth ions] are the promising materials for bulk and waveguide efficient, robust and short-pulse solid-state lasers [1]. For the aims of heat management of such laser systems, one should know the values of linear thermal expansion coefficients αT along the optical indicatrix axes Np, Nm and Ng (as the real laser elements are usually oriented along these directions). Unfortunately, up to now such measurements has not been performed (in the previous papers the values of αT obtained by X-ray analysis were reported only for crystallographic directions [2,3]). The results of several dila-tometric measurements [4,5] differ from [2,3]. The aim of present paper is the comparative experimental study of the αT anisotropy in the isostructural KReW crystals (including measurements in the Np, Nm and Ng directions).

© 2011 Optical Society of America

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