Continuous Control Of Spatial Mode Rotation Using Second Harmonic Generation

This paper reports a continuously rotating spatial mode contributed from the interference between two second harmonic (SH) high-order modes, TM10 and TM01, which were generated in z-cut MgO:LN ridge waveguides with a periodically poled structure. The TM10 and TM01 SH modes were generated from the mixed first harmonic (FH) modes, the phase-matching conditions of the two modes were controlled to be close and to overlap so that the two modes can interference each other. The experiment results showed the interference of the two modes created an odd mode distribution with a specific angle and the distribution was continuously rotating according to the operation temperature. (C) 2010 American Institute of Physics. [doi:10.1063/1.3507267]