Angle-resolved polarized Raman spectroscopy of KGd(WO₄)₂ crystals: analysis of coupled lattice vibrations at 768 cm^-1 and 901 cm^-1

We present a comprehensive experimental and theoretical study of angle-resolved polarized Raman scattering (ARPRS) in N p -cut KGd(WO 4 ) 2 (KGW) crystals, focusing on the prominent Raman shifts at 768 cm -1 and 901 cm -1 . Raman intensity distributions were recorded under both linear and circular polarization conditions, and the resulting polar plots were interpreted using Raman tensor analysis. The results reveal anisotropic behavior consistent with coupled A g vibrational modes and indicate spectral overlap from multiple unresolved vibrational contributions. These findings provide valuable insight into the complex vibrational dynamics of KGW and have important implications for optimizing the performance of Raman-active crystals in high-power laser systems.