Lasing and Longitudinal Cavity Modes in Photo-Pumped Deep Ultraviolet AlGaN Heterostructures
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 84kW/cm2 suggests that the electrically pumped sub-300 nm ultraviolet laser diodes are imminent.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 29, 2013
- Accession Number
- ADA621905
Entities
People
- Baxter Moody
- Jinqiao Xie
- Lindsay Hussey
- Michael Gerhold
- Ramón Collazo
- Raoul Schlesser
- Ronny Kirste
- Seiji Mita
- Wei Guo
- Zachary Bryan
Organizations
- North Carolina State University