A new self-doubling material: RbTiOPO4:(Nb,Ln)

Abstract Concentrations of Er 3+ and Yb 3+ of 0.65 × 10 20 and 1.95 × 10 20 atoms cm −3 , respectively, have been obtained in RbTiOPO 4 :Nb (RTP:Nb) crystals. Some of the Er 3+ and Yb 3+ spectroscopic properties in RTP:Nb crystals are discussed to illustrate the contribution of different centres to the optical absorption and photoluminescence properties. The second harmonic generation capability of crystals containing Nb slightly increase with respect to RTP and a strong dependence was observed with the ratio between the concentration of Nb and lanthanide in them. All these results open the possibility of obtaining a new self-doubling material.