K. Imai et al., HOMOGENEITY AND SHG PROPERTIES OF K3LI2-XNB5-CRYSTALS GROWN BY MICRO-PULLING-DOWN TECHNIQUE(XO15+2X SINGLE), Journal of crystal growth, 177(1-2), 1997, pp. 79-87
Homogeneity of potassium lithium niobate single-crystal fibers grown b
y micro-pulling-down technique is examined via second-harmonic-generat
ion measurement both in axial and radial directions, It is found that
fluctuation of phase-matching wavelength along the growth axis is smal
l and independent of growth rate. On the other hand, relatively large
variation of phase-matching wavelength is found along the radial direc
tion. The phase-matching wavelength shows its minimum around the cente
r of the section of the fiber and increase toward the periphery. Compo
sitional inhomogeneity and internal strain in the radial direction are
investigated in association with variation of phase-matching waveleng
th. X-ray rocking-curve analysis, absorption measurement and polarized
beam transmittance are also reported.