Abstract
Two examples are treated of nonequilibrium phonons in ruby as studied with optical pumping for generation and luminescence for detection. The first example concerns nonequilibrium 29 cm - 1 and near-zone-boundary phonons generated in the nonradiative decay from higher multiplets to 2 A ¯ ( 2 E ) and E ¯ ( 2 E ) . The second example shows that coherent phonons are produced by stimulated emission over the Zeeman transition within the E ¯ ( 2 E ) metastable doublet.
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