Potasiyumu Titanyle Arsenate (KTiOAsO4), cyangwa kristu ya KTA, ni kristu nziza cyane idafite umurongo wa optique ya Optical Parametric Oscillation (OPO).Ifite coefficient nziza idafite umurongo wa optique na electro-optique, yagabanije cyane kwinjiza mukarere ka 2.0-5.0 µm, ubugari bwagutse nubushyuhe bwagutse, buke bwa dielectric.