Open AccessA comprehensive study of impulse pumping of Ti:Sapphire by AlInGaN LEDs
Author(s) -
А. Е. Иванов,
A. V. Aladov,
A. E. Chernyakov,
N. A. Talnishnikh,
А. Л. Закгейм
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1851/1/012020
Subject(s) - light emitting diode , materials science , voltage droop , optoelectronics , sapphire , diode , laser , current density , pulse duration , impulse (physics) , optics , voltage , electrical engineering , physics , quantum mechanics , voltage divider , engineering
LEDs operating under high pulsed current density, which excludes self-heating, are of great interest for different applications, in particular, for pumping lasers with a short time of activator relaxation, such as Ti:Sapphire. The current dependences of the efficiency emission spectra as well as the rise and fall times of high-power blue and green LEDs were investigated under extremely high pulse current density up to 7 kA/cm 2 and a pulse duration of 100 ns to 3 μs. An analysis of the pulse behaviour of the LEDs reveals that the main droop in efficiency and a change in the spectrum occur up to the current densities ∼ 1 kA/cm 2 and seem to be non-thermal. The energy and spectral pulse characteristics of the radiation were studied with simultaneous recording the excited Ti:Sapphire photoluminescence in order to determine the optimal pumping conditions.