High-Resolution Refractive Index and Micro-Raman Spectroscopy of Planar Waveguides in KGd(WO4)(2) Formed by Swift Heavy Ion Irradiation - Agullo Lopez, Fernando; Merchant, C A; Scrutton, P; Garcia-Blanco, S; Hnatovsky, C; Taylor, R S; Garcia-Navarro, A; Garcia, G; Olivares, J; Helmy, A S; Aitchison, J S (Ieee Journal Of Quantum Electronics, 2009)