Temperature-Dependent Characteristics of Single-Mode InAs Submonolayer Quantum-Dot Lasers

Temperature-dependent lasing characteristics of transverse single-mode GaAs-based InAs submonolayer (SML) quantum-dot (QD) lasers are investigated. The SML QD lasers, when operated under continuous wave (cw) conditions up to 65
$^{\circ}{\rm C}$
, exhibit a high characteristic temperature
$(T_{0})$
of around 101 K. The temperature-dependent net modal gain is also studied using the Hakki–Paoli method, yielding a narrow gain spectrum width of 15.6 meV at 20
$^{\circ}{\rm C}$
where the peak gain is 9.6
${\rm cm}^{-1}$
. The lasers exhibit a low loss of
${-}{6}$
to
${-}{\rm 9}~{\rm cm}^{-1}$
in the temperature range of 15
$^{\circ}{\rm C}$
to 65
$^{\circ}{\rm C}$
.