THEORETICAL CALCULATIONS OF THE PRESSURE-INDUCED SHIFT OF A PHOTOACOUSTIC PHASE SIGNAL IN ALEXANDRITE (BEAL2O4CR3+)

The effect of pressure on the phase (delta) of the photoacoustic signa l in alexandrite was considered theoretically. It is shown that increa se of pressure induces a non-linear increase of delta. The possibility of using the normalized phase difference shift of the photoacoustic s ignal in alexandrite upon pressure as a new method for high-pressure m easurement in the diamond anvil cell is discussed.