Abstract

We found correlation between optical dephasing time T₂ and coefficient of far-infrared absorption α for doped with Nd³⁺ ordered and disordered (CaF₂)|_1-x-(YF₃)_x crystalline systems. We demonstrate that measured by accumulated photon echo technique T₂ value decreases from 3.6 ns for single CaF₂ to 0.6 11s for mixed CaF₂-YF₃ (x=0.12) crystal at picosecond excitation of Nd^{3+ 4}I_9/2-⁴G_5/2 transition (T=9K). Optical dephasing mechanism for both ordered and disordered [1] systems is described by direct relaxation with absorption of the single phonons of 30-100 cm^-1 frequencies and Raman two phonon process.

© 1996 IEEE