Raman lasers offer great potential for efficiently pumping optical parametric oscillation (OPO) and achieving parametric radiations with high beam quality. Compact noncritically phase-matched 1625-nm KTiOPO4 (KTP) OPO intracavity driven by the 1091-nm KTiOAsO4 (KTA) Raman laser is demonstrated. The maximum average output power at the signal wavelength of 1625 nm is 180 mW obtained under the LD pump power of 8 W. Corresponding pulse repetition rate and pulse width are, respectively, measured to be 8 kHz and 2.1 ns, with the single pulse energy and peak power calculated to be 22.5 μJ and 10.7 kW, respectively. The M2 factor of the signal wave is measured to be 1.3 by knife-edge technique. The cascaded Raman conversion in KTA and OPO in KTP may provide a new method for obtaining 1625-nm laser with high beam quality, a potential light source for optical time-domain reflectometer.