Analysis of four peaks second harmonic generation using phase shifters in multiple QPM

We investigate the effect of phase shifter domains to generate multiple Second harmonic Generation (SHG) response in a single channel QPM device. Phase shifters are the domains capable of changing phase of the interacting wave in the medium from 0 to 2π. In this article, we demonstrate the generation of four peak SHG in a QPM device by distributing three phase shifters. The effect of phase shifter are analyzed by changing its position and shape. When the position of the phase shifter changes, deviation in peaks were observed and the change in shape of the phase shifters resulted in the growth of single SHG peak to four.