Excitation photon energy and carrier density dependence of spin dynamics in bulk CdTe crystal was studied by time resolved pump-probe reflectivity technique at room temperature. The results show that spin relaxation time decreases monotonously. While with increasing excitation carrier density, the time constants increases initially then decreases after reaching a maximum value. Our experimental results reveal that both D’yakonov–Perel’ [M. I. D’yakonov and V. I. Perel’, Sov. Phys. JETP38, 177 (1974)] and Elliot–Yafet [R. J. Elliott, Phys. Rev.96, 266 (1954); Y. Yafet, Solid State Phys.14, 1 (1963)] mechanisms dominate the spin relaxation process in CdTe crystal.

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