Carrier-phase measurement of subharmonic optical pulses

Summary form only given.We have developed a subharmonic generator by using the femtosecond optical parametric oscillator (OPO) and observed phase relation between three pulses. Wavelengths of the pump, signal and the idler are 850 nm (3w), 1275 nm (2w) and 2550 nm (w), respectively by using KTiOPO/sub 4/ (KTP) with a 71.5 deg. phase matching angle.