Green-pumped CW singly resonant optical parametric oscillator based on MgO:PPLN with frequency stabilization

This paper shows that it is possible to build a stable cw optical parametric oscillators from MgO doped periodically poled lithium niobate pumped at 532 nm by a single-mode DPSS (diode-pumped solid-state) laser. The ring cavity is resonant for the signal wave and one mirror is mounted on a piezo-actuator for scanning and controlling the cavity length. The temperature controlled, 40 mm-long MgO:PPLN crystal is placed between the mirrors. An uncoated glass etalon inside the resonator allows for frequency fine tuning. To prove the stability of our cw SRO we performed Doppler-free saturation spectroscopy of the 133Cs D2 line at the signal wavelength of 852 nm by scanning the cavity length over 1.2 GHz .Hence, results indicate that MgO:PPLN can be considered an appropriate material for green-pumped cw SROs.