Abstract

ABSTRACT Here we report on a noncollinear optical parametric oscillator (OPO) in periodically poled KTiOPO4. The noncollinear OPOcavity consisted of a 10 mm-long periodically poled KTiOPO4 crystal placed between two flat mirrors and pumped at532nm by a frequency doubled Q-switched Nd:YAG. The OPO threshold for the collinear configuration was reached at thepump pulse energy of 10 jtJ and increased monotonically when increasing the noncolinear interaction angle. The efficiencyof the OPO with PPKTP reached 50% in the collinear configuration and about 40% in the noncollinear configuration. Thenoncollinear OPO generated two signal-idler pairs. Only one of the waves in each pair was resonated in the OPO cavity,while the complementary waves were generated at different angles as required by momentum conservation. The OPO could be tuned over a range of about 290 nm around 1064 nm wavelength by adjusting the cavity angle and the PPKTP temperature. Narrowing of the OPO spectrum was observed for small noncollinear interaction angles.Keywords: Nonlinear optical materials, Periodically poled KTiOPO4, Optical parametric oscillators, Noncollinearinteractions.

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