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The relaxation time of the transition from the lower laser level 4 I 11/2 to the ground state 4 I 9/2 of the Nd 3+ ions was determined experimentally for a crystal of Y 3 Al 5 O 12 :Nd 3+ . The relaxation time was measured by two independent methods. The value obtained, τ 21 ≤ 3· 10 –7 sec, was associated with the very broad (up to ~ 900 cm –1 ) phonon spectrum of the garnet crystal.
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Zlenko et al. (1973) studied this question.
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