Wetting-layer-pumped continuous wave surface emitting quantum dot laser

Hani J. Kbashi, Adrian H. Quarterman, Oliver J. Morris, Mohamed Henini, Anne C. Tropper, Keith G. Wilcox

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report a continuous wave 1 μm laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56% with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 μm thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.

Original languageEnglish
Title of host publicationVertical External Cavity Surface Emitting Lasers (VECSELs) II
EditorsAnne C. Tropper
Volume8242
DOIs
Publication statusPublished - 26 Mar 2012
EventVertical External Cavity Surface Emitting Lasers (VECSELs) II - San Francisco, CA, United States
Duration: 23 Jan 201224 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8242
ISSN (Print)0277-786X

Conference

ConferenceVertical External Cavity Surface Emitting Lasers (VECSELs) II
CountryUnited States
CitySan Francisco, CA
Period23/01/1224/01/12

Fingerprint

Quantum dot lasers
Wetting
Surface Waves
Quantum Dots
Surface waves
wetting
continuous radiation
quantum dots
pumping
Laser
Pump
Pumps
pumps
lasers
Diamond
Absorption
Heat
Semiconductor quantum dots
Strombus or kite or diamond
Diamonds

Keywords

  • And wetting layer
  • Optically pumped
  • Quantum dot
  • Semiconductor laser
  • VECSEL

Cite this

Kbashi, H. J., Quarterman, A. H., Morris, O. J., Henini, M., Tropper, A. C., & Wilcox, K. G. (2012). Wetting-layer-pumped continuous wave surface emitting quantum dot laser. In A. C. Tropper (Ed.), Vertical External Cavity Surface Emitting Lasers (VECSELs) II (Vol. 8242). [82420Y] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8242). https://doi.org/10.1117/12.906192
Kbashi, Hani J. ; Quarterman, Adrian H. ; Morris, Oliver J. ; Henini, Mohamed ; Tropper, Anne C. ; Wilcox, Keith G. / Wetting-layer-pumped continuous wave surface emitting quantum dot laser. Vertical External Cavity Surface Emitting Lasers (VECSELs) II. editor / Anne C. Tropper. Vol. 8242 2012. (Proceedings of SPIE - The International Society for Optical Engineering).
@inproceedings{4a81aa6b72b5411c83bbc7b505a6cf39,
title = "Wetting-layer-pumped continuous wave surface emitting quantum dot laser",
abstract = "We report a continuous wave 1 μm laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56{\%} with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 μm thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.",
keywords = "And wetting layer, Optically pumped, Quantum dot, Semiconductor laser, VECSEL",
author = "Kbashi, {Hani J.} and Quarterman, {Adrian H.} and Morris, {Oliver J.} and Mohamed Henini and Tropper, {Anne C.} and Wilcox, {Keith G.}",
year = "2012",
month = "3",
day = "26",
doi = "10.1117/12.906192",
language = "English",
isbn = "9780819488855",
volume = "8242",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
editor = "Tropper, {Anne C.}",
booktitle = "Vertical External Cavity Surface Emitting Lasers (VECSELs) II",

}

Kbashi, HJ, Quarterman, AH, Morris, OJ, Henini, M, Tropper, AC & Wilcox, KG 2012, Wetting-layer-pumped continuous wave surface emitting quantum dot laser. in AC Tropper (ed.), Vertical External Cavity Surface Emitting Lasers (VECSELs) II. vol. 8242, 82420Y, Proceedings of SPIE - The International Society for Optical Engineering, vol. 8242, Vertical External Cavity Surface Emitting Lasers (VECSELs) II, San Francisco, CA, United States, 23/01/12. https://doi.org/10.1117/12.906192

Wetting-layer-pumped continuous wave surface emitting quantum dot laser. / Kbashi, Hani J.; Quarterman, Adrian H.; Morris, Oliver J.; Henini, Mohamed; Tropper, Anne C.; Wilcox, Keith G.

Vertical External Cavity Surface Emitting Lasers (VECSELs) II. ed. / Anne C. Tropper. Vol. 8242 2012. 82420Y (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8242).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Wetting-layer-pumped continuous wave surface emitting quantum dot laser

AU - Kbashi, Hani J.

AU - Quarterman, Adrian H.

AU - Morris, Oliver J.

AU - Henini, Mohamed

AU - Tropper, Anne C.

AU - Wilcox, Keith G.

PY - 2012/3/26

Y1 - 2012/3/26

N2 - We report a continuous wave 1 μm laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56% with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 μm thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.

AB - We report a continuous wave 1 μm laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56% with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 μm thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.

KW - And wetting layer

KW - Optically pumped

KW - Quantum dot

KW - Semiconductor laser

KW - VECSEL

UR - http://www.scopus.com/inward/record.url?scp=84858640683&partnerID=8YFLogxK

U2 - 10.1117/12.906192

DO - 10.1117/12.906192

M3 - Conference contribution

SN - 9780819488855

VL - 8242

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Vertical External Cavity Surface Emitting Lasers (VECSELs) II

A2 - Tropper, Anne C.

ER -

Kbashi HJ, Quarterman AH, Morris OJ, Henini M, Tropper AC, Wilcox KG. Wetting-layer-pumped continuous wave surface emitting quantum dot laser. In Tropper AC, editor, Vertical External Cavity Surface Emitting Lasers (VECSELs) II. Vol. 8242. 2012. 82420Y. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.906192