Ring Cavity Surface Emitting Quantum Cascade Laser With A Near Gaussian Beam Profile
Keywords
beam quality; quantum cascade laser; Ring cavity; surface emission
Abstract
We propose a vertical spiral phase corrector for ring cavity surface emitting (RCSE) quantum cascade lasers (QCLs), which will allow achievement of near-Gaussian generated beam profile. A problem with RCSE QCLs is their donutshaped intensity distribution with a node along the symmetry axis of the ring. This arises because of the π phase difference for the azimuthally polarized rays emitted from opposite elements of the ring. We theoretically demonstrate that near-Gaussian beams can be achieved with a spiral phase shifter that adds one wavelength of additional optical path in going once around the ring. Various three dimensional lithographic techniques for fabricating such a phase shifter, including a grey scale mask, electron-beam resist dose dependency, and two photon induced photopolymerization, are considered. Ring cavity QCLs with the proposed phase corrector will feature better beam quality, larger power, and better resistance to radiative damage in comparison with traditional edge-emitting QCLs.
Publication Date
1-1-2015
Publication Title
Proceedings of SPIE - The International Society for Optical Engineering
Volume
9466
Issue
January
Document Type
Article; Proceedings Paper
Personal Identifier
scopus
DOI Link
https://doi.org/10.1117/12.2175616
Copyright Status
Unknown
Socpus ID
84937231763 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/84937231763
STARS Citation
Figueiredo, Pedro N.; Muraviev, Andrey; and Peale, Robert E., "Ring Cavity Surface Emitting Quantum Cascade Laser With A Near Gaussian Beam Profile" (2015). Scopus Export 2015-2019. 1709.
https://stars.library.ucf.edu/scopus2015/1709