UP-CONVERSION LUMINESCENCE IN THE ND3-FREQUENCY DOUBLING LASER CRYSTAL(YAB SELF)

In this work the infrared to visible up-converted luminescence in neod ymium-doped yttrium aluminium berate has been systematically investiga ted in the excitation spectral range corresponding to diode pumping (7 00-850 nm) under continuous wave and pulsed pumping. Three visible ban ds centred at 535, 590 and 675 nm are observed, these emissions mainly departing from the excited state (4)G(7/2). By Using a simple rate eq uation model to fit the experimental results, it has been concluded th at this excited state is populated via up-conversion energy transfer b etween Nd3+ ions. (C) 1998 Elsevier Science B.V. All rights reserved.