Frequency doubling with periodically poled KTiOPO4 at the fundamental wave of ce

We report the continuous wave (CW) second harmonic generation (SHG) with a periodically poled KTiOPO4 (PPKTP) pumped by a diode laser at 852.356 nm, which is exactly resonant on the cesium D2 transition. An output power of 54.4 mW of blue light at 426 nm was obtained at the pump power of 136.4 mW. T