Stress-induced waveguides in Nd:YAG by simultaneous double-beam irradiation with femtosecond pulses - Castillo, Gabriel R.; Romero, Carolina; Lifante, Gines; Jaque, Daniel; Chen, Feng; Varela, Oscar; Garcia-Garcia, Enrique; Mendez, Cruz; Camacho-Lopez, Santiago; Vazquez de Aldana, Javier R.; (Optical Materials, 2016)