Share Email Print
cover

Proceedings Paper • new

Semipolar III-nitride laser diodes for solid-state lighting
Author(s): Shlomo Mehari; Daniel A. Cohen; Daniel L. Becerra; Haojun Zhang; Claude Weisbuch; James S. Speck; Shuji Nakamura; Steven P. DenBaars
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Several hurdles to further enhance the performance of semipolar III-Nitride laser diodes are addressed in this work. Particularly, we focused on improving their high operating voltage by thinning the p-GaN cladding layer and utilizing a transparent conductive oxide p-contact. On-wafer optical absorption measurements showed that a further reduction in voltage with thinner p-GaN was limited by increased optical loss due to increased mode overlap with the ITO/metal anode. In separate attempts to minimize bulk-related optical losses, we implemented a new design that consisted of an AlGaN electron blocking layer (EBL) placed remotely from the quantum wells (QWs) and a low p-waveguide Mg doping profile. A very low optical loss of about 2 cm-1 was extracted but the net improvement in differential efficiency was limited by lower internal injection efficiency due to carrier accumulation in the p-waveguide region. With an optimized design, that consisted of a lightly doped EBL close to the QWs and a UID p-waveguide, an improved light output power of 1.4 W at 1.5 A and a low threshold current density of 1.2 kA/cm2 were obtained.

Paper Details

Date Published: 1 March 2019
PDF: 6 pages
Proc. SPIE 10939, Novel In-Plane Semiconductor Lasers XVIII, 109390G (1 March 2019); doi: 10.1117/12.2506798
Show Author Affiliations
Shlomo Mehari, Univ. of California, Santa Barbara (United States)
Daniel A. Cohen, Univ. of California, Santa Barbara (United States)
Daniel L. Becerra, Univ. of California, Santa Barbara (United States)
Haojun Zhang, Univ. of California, Santa Barbara (United States)
Claude Weisbuch, Univ. of California, Santa Barbara (United States)
CNRS, Ecole Polytechnique (France)
CNRS (France)
James S. Speck, Univ. of California, Santa Barbara (United States)
Shuji Nakamura, Univ. of California, Santa Barbara (United States)
Steven P. DenBaars, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 10939:
Novel In-Plane Semiconductor Lasers XVIII
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

© SPIE. Terms of Use
Back to Top