Spin-orbit interaction effects on the electronic structure of spherical quantum dot with different confinement potentials

The vertical-external-cavity surface-emitting laser (VECSEL) has shown promise in becoming an efficient source of high power and high beam quality coherent radiation. In order to live up to its true potential, the VECSEL must be thermally managed in order to avoid thermal damage as thermal lensing and filamentation causing preventing it from operating in a single mode regime. For an optically pumped VECSEL, optical cooling presents an elegant solution for thermal management as it does not require electrical or thermal conduction. The goal of optical refrigeration is to achieve radiation balance lasing (RBL) when the active medium is maintained at a steady uniform temperature. In this work, we investigate the active medium characteristics and operating conditions that can lead to RBL in a semiconductor medium and show that to achieve RBL, the gain medium should be engineered to create a density of states that simultaneously allows gain and strong anti-Stokes luminescence. Such a medium may incorporate bandtail states, impurities or quantum dots. We provide a recipe for optimization of such band structure-engineered materials to achieve the lowest threshold and highest output power.

show abstract

Bandgap engineering and prospects for radiation-balanced vertical-external-cavity surface-emitting semiconductor lasers

Vafapour

Khurgin

2018

Opt. Express

View full text Add to dashboard Cite

show abstract

Time, space, and spectral multiplexing for radiation balanced operation of semiconductor lasers

Vafapour

Khurgin

2018

Opt. Express

View full text Add to dashboard Cite

Radiation balanced lasing (RBL) is an attractive pathway towards the development of high power and good beam quality lasers because heat removal via anti-Stokes luminescence (optical refrigeration) does not require additional connections and components and the heat is dissipated away from the active medium. Optical refrigeration had been demonstrated in the rare-earth doped laser medium but is far more difficult to achieve it in semiconductors laser medium. The main obstacle to achieve RBL in semiconductors is that the most efficient cooling occurs at relatively low carrier densities, while the gain required to sustain laser operation occurs at much higher densities. In this study, we explore the means of resolving this conundrum by separating the optical refrigeration and lasing in temporal, spatial, and/or spectral domains. Time multiplexing involves modulating the pump and operating the laser in pulse modes with lasing and cooling intervals. Space multiplexing involves having separate regions (quantum wells and dots) for lasing and cooling. The spectral multiplexing involves operating with two separate pumps - one for lasing and one for cooling. These methods will be compared in the study with the goal of selecting the optimal path RBL in semiconductor lasers.

show abstract

Tunable light trapping and absorption enhancement with graphene-based complementary metasurfaces

Liu¹,

Zhou²,

Jiang³

et al. 2019

Opt. Mater. Express

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Spin-orbit interaction effects on the electronic structure of spherical quantum dot with different confinement potentials

Cited by 3 publications

References 38 publications

Bandgap engineering and prospects for radiation-balanced vertical-external-cavity surface-emitting semiconductor lasers

Bandgap engineering and prospects for radiation-balanced vertical-external-cavity surface-emitting semiconductor lasers

Time, space, and spectral multiplexing for radiation balanced operation of semiconductor lasers

Tunable light trapping and absorption enhancement with graphene-based complementary metasurfaces

Contact Info

Product

Resources

About