Accession Number:

ADA621905

Title:

Lasing and Longitudinal Cavity Modes in Photo-Pumped Deep Ultraviolet AlGaN Heterostructures

Descriptive Note:

Journal article

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Xie, Jinqiao
• Mita, Seiji
• Bryan, Zachary
• Guo, Wei
• Hussey, Lindsay
• Moody, Baxter
• Schlesser, Raoul
• Kirste, Ronny
• Gerhold, Michael
• Collazo, Ramon

Report Date:

2013-04-29

Pagination or Media Count:

7.0

Abstract:

To unambiguously distinguish lasing from super luminescence, key elements of lasing such as longitudinal cavity modes with narrow line-width, polarized emission, and elliptically shaped far-field pattern, need to be demonstrated at the same time. Here, we show transverse electric polarized lasing at 280.8 nm and 263.9 nm for AlGaN based multi-quantum-wells and double heterojunction structures fabricated on single crystalline AlN substrates. An elliptically shaped far-field pattern was recorded when pumped above threshold. With cavities shorter than 200 micrometers, well-defined, equally spaced longitudinal modes with line widths as narrow as 0.014 nm were observed. The low threshold pumping density of 84kWcm2 suggests that the electrically pumped sub-300 nm ultraviolet laser diodes are imminent.

Descriptors:

• *ALUMINUM GALLIUM NITRIDES
• *DIODE LASERS
• *LASER CAVITIES
• *OPTICAL PUMPING
• CHEMICAL VAPOR DEPOSITION
• CRYSTALLIZATION
• ELECTRIC POWER
• ELECTRICAL PROPERTIES
• EPITAXIAL GROWTH
• HETEROJUNCTIONS
• LIGHT EMITTING DIODES
• LOW DENSITY
• LUMINESCENCE
• POLARIZATION
• SUBSTRATES
• THRESHOLD EFFECTS
• ULTRAVIOLET LASERS
• ULTRAVIOLET RADIATION
• WAFERS

Subject Categories:

• Physical Chemistry
• Lasers and Masers
• Electricity and Magnetism
• Optics
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE