Journal
QUANTUM ELECTRONICS
Volume 49, Issue 6, Pages 535-539Publisher
TURPION LTD
DOI: 10.1070/QEL17035
Keywords
optical pumping; ultraviolet stimulated radiation; ultrathin GaN/AlN quantum wells; molecular beam epitaxy
Funding
- State Programme of Research and Development Photonics, Opto-and Microelectronics [2.1.01, 2.1.04]
- RFBR-BRICS [17-52-278980089]
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The stimulated emission and photoluminescence of ultrathin GaN quantum wells with a nominal thickness of 1.5-2 monolayers (MLs) and AlN barrier layers 4-6.66 ML thick, obtained by plasma-activated molecular beam epitaxy on c-sapphire substrates, are studied. The stimulated emission of TE polarisation in ultrathin GaN/AlN quantum wells is obtained under pumping directly into quantum wells. The wavelength of stimulated emission varied from 262 to 290 nm, depending on the thickness of the wells and barriers. It is shown that stimulated emission is achieved on localised GaN states with a thickness of 2 and 3 ML in ultrathin quantum wells with a nominal thickness of 1.5 and 2 ML, respectively. The minimum excitation threshold of stimulated emission was 700 kW cm(-2) at lambda = 270 nm.
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