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Laser shock wave‐induced visible mechanoluminescence from semi‐transparent organic crystals
Author(s) -
Sonwane V.D.,
Gour Anubha S.,
Jha Piyush
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3155
Subject(s) - laser , shock wave , mechanoluminescence , materials science , shock (circulatory) , fluence , optics , microsecond , crystal (programming language) , intensity (physics) , wavelength , optoelectronics , luminescence , mechanics , physics , medicine , computer science , programming language
Indirect focusing of the output from a pulsed infrared Nd 3+ :YAG laser through a shock‐generating layer onto organic crystals results in the emission of an intense microsecond duration pulse of mechanoluminescence (ML). The ML appears after a threshold laser fluence has been reached and increases sharply above this threshold. This specifies that there is a corresponding amplitude of a laser‐induced shock wave that is necessary to induce crystal fracturing. Thus, the intensity of ML can be controlled by varying the laser fluence. Piezoelectric charges produced on the surfaces of a fractured crystal create the foundation for luminescence. Initially, the ML intensity increases with the shock wave pressure and time due to the creation of more surfaces in the crystal; the ML intensity reaches a peak value and then decreases over time. Thus, laser shock wave‐induced ML provides a new optical technique for the study of materials under high pressure. Expressions explored for the characteristics of laser shock wave‐induced ML satisfactorily explain the experimental results. Copyright © 2016 John Wiley & Sons, Ltd.