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Optical properties of Nd3+ -doped phosphate glasses have been studied on the basis of the Judd-Ofelt theory. With the intermediate cross-section value and the weak 4 / 6 parameter, we expect a relatively prominent 4 F3/2 4 I11/2 laser emission. The quenching effect of the emission intensity is discussed in terms of cross-relaxation between the Nd3+ ions as well as energy transfer processes within the host matrix. From the investigation of the decay rate from the 4 F3/2 state with the neodymium concentration, we suggest that self-quenching is insured by dipole-dipole interaction. This result was also confirmed by the simulation of the decay with the Inokuti-Hyrayama model.

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