Abstract
In this contribution we present a β-BaB2O4 optical parametric oscillator (OPO) that is pumped at 355 nm by a Q-switched single-axial mode pulsed Nd: YAG laser. The OPO, operated in a ring-cavity configuration, is injection seeded by a low power diode laser at 830 nm. The results of the injection seeding indicate a narrow-bandwidth output of the OPO at the signal (620 nm) and idler (830 nm) wavelengths. To stabilize the length of the OPO cavity, a Hänsch-Couillaud1 locking mechanism is incorporated: the continuous light from the diode laser transmitted through the OPO cavity is used to optimize the cavity length. This stabilization technique is also used to stabilize external cavities in continuous laser systems.2 The idler output of the OPO follows the same optical path as the diode laser (Fig. 1). To prevent disturbance of the locking mechanism by the idler light pulses, a chopper was placed in front of the lock box. With this scheme we are able to tune the seeded OPO, while keeping the cavity length optimized.
Published Version
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