Geoscience Reference
In-Depth Information
(a)
(b)
(c)
(d)
100
100
010
001
001
001
110
110
010
Nd: YVO
4
Nd: YVO
4
Eu: YVO
4
(e)
Figure 7.77 (a
d) Photographs of doped YVO
4
crystals and (e) schematic diagrams
[321]
.
morphology is rod shaped or prismatic habit. Since the requirement of a crystal for
solid-state laser host is a thin tabular platelet of 5
3
5
3
2mm
3
dimension, the
crystals obtained either by flux or melt technique exhibiting highly facetted morpho-
logical forms have to be cut and polished to the desired shape before the device
fabrication. Hence, an emphasis has been made on the influence of pH of the growth
media to get the desired morphology.
Figure 7.77a
shows photographs of doped
YVO
4
crystals, and the corresponding schematic diagrams are shown in
Figure 7.77b
.
Table 7.27
gives the morphology of the rare earth vanadates. The mor-
phology could be changed from elongated broad hexagonal platelets to more or less
cubic shape by a systematic variation in the pH of the growth media, and the thick-
ness was controlled to approximately 2 mm. Thus, the largest crystals obtained
