Correlation of CdSe quantum dot morphology, structure design and lasing properties of optically pumped green CdSe/ZnMgSSe lasers

Abstract

We report on the molecular beam epitaxy growth of optically pumped Cd(Zn)Se/ZnMgSSe laser heterostructures with CdSe/ZnSe quantum dots in the active region, emitting in the green spectral range. The lasing threshold as low as 2.5 kW/cm 2 and the external quantum efficiency of 43%, maximum pulse power of 22.35 W is demonstrated.

Compact green laser converter with injection pumping, based on MBE grown II–VI nanostructures

“…The waveguide was designed to obtain the optical confinement factor as high as G=0.021. The structure exhibited a superior performance both under optical pumping with an N 2 -laser [3] and as an active part of the optically pumped laser converter [6]. The active region of the second structure (#4585) contains five electronically coupled CdSe QD active layers, that provides the twice larger optical confinement factor G=0.042.…”

“…The II-VI QD laser heterostructures were grown by molecular beam epitaxy (MBE) on a GaAs epitaxial buffer layer [3]. Two of them were selected to be tested as an active element of the injection laser converter.…”

“…Recent development of blue-violet III-Nitride LDs has yielded the maximum operational wavelength of 485 nm at 300 K and faced the problem of degradation of the quantum efficiency in the involved InGaN quantum wells (QWs) with high enough content of In [2]. A high quantum efficiency (42%) and very low-threshold power density (2.5 kW/cm 2 at 300 K) were achieved in the optically pumped undoped ZnSe-based laser structures with a CdSe quantum dot (QD) active region [3]. These devices demonstrate much better degradation stability than ZnSe LDs and, therefore, they are promising candidates for the active elements of high-performance electron beam-pumped lasers [4].…”

ZnMgSSe/ZnSe/CdSe quantum dot heterostructures for green laser applications

“…As a result, an experimental sample of a compact violet-green integrated laser converter contained CdSe QD laser heterostructure pumped by an emission of the InGaN laser diode was obtained. This paper presents a short overview of our achievements in this field [15][16][17] and includes also some new unpublished results.…”

Internal parameters and optical properties of green II‐VI heterostructure lasers with active region composed of multi‐sheet electronically‐coupled CdSe quantum dots

“…3 Results and discussion For testing optical quality of new laser heterostructure, its photoluminescence (PL) spectrum was compared with that of previously grown laser heterostructures with two electronicallycoupled CdSe QD sheets, which exhibited the lowest laser threshold of 2.5 kW/cm 2 [3] among all our previously studied structures. Figure 1 shows PL spectra of both structures under the surface excitation by radiation of N 2 laser with the intensity of the order of the laser threshold value.…”