Photoluminescence, stimulated and laser emission in CuInSe2 crystals

I. E. Svitsiankou, V. N. Pavlovskii, E. V. Lutsenko, G. P. Yablonskii, A. V. Mudryi, O. M. Borodavchenko, V. D. Zhivulko, R. W. Martin, M. V. Yakushev

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Abstract

Excitonic quality CuInSe2 crystals were studied using low-temperature (10 K) photoluminescence (PL) excited by continuous wave and nanosecond pulsed lasers at power densities from 0.01 kW/cm2 to 76 kW/cm2 . Increasing the excitation power density level to 26 kW/cm2 resulted in the appearance of a stimulated emission SE-band in the PL spectra at 1.035 eV. Further increase in the excitation level to 39 kW/cm2 generated on the top of the SE band a structure of equidistant sharp lines attributed to laser emission. at 1.035 eV. Further increase in the excitation level to 39 kW/cm2 generated a structure of equidistant sharp lines attributed to laser emission on the top of the SE band. The lasing regime suggests the presence of volumes with parallel faces (microcracks or grain boundaries), which act as laser mirrors within the CuInSe2 crystals.
Original languageEnglish
Article number212103
Number of pages6
JournalApplied Physics Letters
Volume119
Issue number21
DOIs
Publication statusPublished - 23 Nov 2021

Keywords

  • CuInSe2
  • crystal
  • photoluminescence
  • pulsed laser excitation
  • stimulated emission
  • lasing

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