title: Effects of non-lasing band in two-dimensional photonic-crystal lasers clarified using omnidirectional band structure.
abstract: 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.
authors.affiliation: Material Research Group, Central Research Laboratory, Hamamatsu Photonics K.K.,5000 Hirakuchi, Hamakitaward, Hamamatsu City 434-8601, Japan. yoshitaka.kurosaka@crl.hpk.co.jp
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Kurosaka
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Hirose
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Watanabe
authors.forename: Takahiro
authors.initials: T
authors.lastname: Sugiyama
authors.forename: Yong
authors.initials: Y
authors.lastname: Liang
authors.forename: Susumu
authors.initials: S
authors.lastname: Noda