Open AccessEffects of non-lasing band in two-dimensional photonic-crystal lasers clarified using omnidirectional band structure
Author(s) -
Yoshitaka Kurosaka,
Keikichi Hirose,
Akiyoshi Watanabe,
Takahiro Sugiyama,
Yong Liang,
Susumu Noda
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.021773
Subject(s) - lasing threshold , optics , photonic crystal , laser , omnidirectional antenna , materials science , optoelectronics , semiconductor laser theory , main lobe , gain switching , laser beam quality , physics , laser beams , telecommunications , computer science , antenna (radio)
We investigated the effects of non-lasing bands on the beam patterns in photonic-crystal lasers by evaluating the omnidirectional band structure both experimentally and theoretically. We found that a new, weak dual-streak pattern is occasionally generated around the main lobe of the output beam because of scattering of the lasing beam in the non-lasing bands despite a wavenumber mismatch. This result indicates that we can design the high-quality devices without such a noise pattern. In addition, this evaluation method is expected to be useful for developing various high-functionality PC lasers.