Abstract
Yttrium calcium oxy borate (YCOB) is an important nonlinear optical (NLO) crystal belongs to RECOB (RE=Gd, Sm, Nd, Er, La and Y) family of crystals with the general formula RECa4O(BO3)3. YCOB is a negative biaxial crystal which crystallizes in the monoclinic structure with non-centrosymmetric space group Cm. In the present work, the flux grown YCOB single crystals were irradiated with various fluences of 120MeV Au9+ heavy ions at ambient and at liquid nitrogen (LN2) temperatures, respectively. Grazing incidence angle X-ray diffraction (GIXRD) studies of pristine and irradiated crystals confirm the ion induced surface modification. UV–Visible spectral analysis shows that there was a red shift of optical edge of the pristine sample with ion fluence from 1011 to 1013ions/cm2. Laser Raman spectrum of YCOB crystal presents the intense band of (BO3)3− modes at 1123cm−1 and its peak intensity reduces with ion fluence. The dielectric loss and relative permittivity of YCOB crystal show a marked increase with ion irradiation fluence.
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