Wide-bandgap GaN-based watt-class photonic-crystal lasers
Keiji Emoto,Tomoaki Koizumi,M. Hirose,M. Jutori,Takuya Inoue,Kenji Ishizaki,Menaka De Zoysa,Hiroyuki Togawa,Susumu Noda +8 more
Reads0
Chats0
TLDR
In this paper , a GaN-based photonic-crystal surface-emitting laser (PCSEL) with a very narrow divergence angle at blue wavelengths was proposed.Abstract:
Abstract Short-wavelength (blue-violet-to-green) lasers with high power and high beam quality are required for various applications including the machining of difficult-to-process materials and high-brightness illuminations and displays. Promising light sources for such applications are wide-bandgap GaN-based photonic-crystal surface-emitting lasers (PCSELs), which are based on two-dimensional resonance in the photonic crystal. Developments of these devices have lagged behind those of longer-wavelength GaAs-based PCSELs, because device designs for achieving robust two-dimensional resonance and a nanofabrication process that avoids introducing disorders have remained elusive for wide-bandgap GaN-based materials. Here, we address these issues and successfully realize GaN-based PCSELs with high, watt-class (>1 W) output power and a circular, single-lobed beam with a very narrow (~0.2°) divergence angle at blue wavelengths. In addition, we demonstrate continuous-wave operation with a high output power (~320 mW) and a high beam quality ( M 2 ~1). Our results will enable the use of GaN-based PCSELs in the above-mentioned applications. read more
Citations
More filters
Journal ArticleDOI
フォトニック結晶面発光レーザーの進展と展望
TL;DR: Society 5.0.0 as discussed by the authors ] is the current edition of PCSEL, which is used in this article.http://www.society5.0-society.org
Journal ArticleDOI
Continuous wave room temperature operation of the 2 μm GaSb-based photonic crystal surface emitting diode lasers
TL;DR: In this paper , a 2'μm GaSb-based photonic-crystal surface-emitting diode laser has been realized, achieving a threshold current densities of 500'A/cm2 at 20'°C.
Journal ArticleDOI
Photonic-crystal surface-emitting lasers with modulated photonic crystals enabling 2D beam scanning and various beam pattern emission
Ryoichi Sakata,Kenji Ishizaki,Menaka De Zoysa,Kyoko Kitamura,Takuya Inoue,John L. Gelleta,Susumu Noda +6 more
TL;DR: In this article , an inverse Fourier transform was used to enable the emission of various beam patterns, such as flash patterns and multi-dot patterns, from a single photonic crystal without using external optical elements.
Journal ArticleDOI
Smart laser with on-demand mode control
Menaka De Zoysa,Yu Nakagawa,Koki Izumi,Takuya Inoue,Kenji Ishizaki,Masahiro Yoshida,John L. Gelleta,Susumu Noda +7 more
TL;DR: In this paper , the authors demonstrate mixed-mode state control in a photonic crystal surface-emitting laser at the chip level by leveraging the mechanism of mutual injection locking via dynamic control of the current injection distribution.
References
More filters
Journal ArticleDOI
Coherent two-dimensional lasing action in surface-emitting laser with triangular-lattice photonic crystal structure
TL;DR: In this article, a surface-emitting laser with a two-dimensional photonic crystal structure is investigated, where the wavelength of the active layer is designed to match the folded (second-order) Γ point of the Γ−X direction.
Journal ArticleDOI
Watt-class high-power, high-beam-quality photonic-crystal lasers
Kazuyoshi Hirose,Kazuyoshi Hirose,Yong Liang,Yoshitaka Kurosaka,Yoshitaka Kurosaka,Akiyoshi Watanabe,Takahiro Sugiyama,Susumu Noda +7 more
TL;DR: In this paper, a watt-class high-power, single-mode operation by a two-dimensional photonic-crystal surface-emitting laser under room-temperature, continuous-wave conditions was demonstrated.
Journal ArticleDOI
GaN Photonic-Crystal Surface-Emitting Laser at Blue-Violet Wavelengths
TL;DR: This work has developed a fabrication method, named “air holes retained over growth,” in order to construct a two-dimensional gallium nitride (GaN)/air photonic-crystal structure, which has aPhotonic-Crystal band-edge effect sufficient for the successful operation of a current-injection surface-emitting laser.
Journal ArticleDOI
Photonics: lasers producing tailored beams.
TL;DR: Photonic crystals are engineer to generate semiconductor lasers that produce a range of beam patterns while maintaining stable single-mode oscillation to contribute to the realization of compact lasers that are capable of producing diverse beam patterns on demand.
Book ChapterDOI
The General Approach
Mark Tatham,Katherine Morton +1 more
TL;DR: Separate legislation may be the best way of promoting and embedding BSL as a minority language in Scotland and improve consistency of service delivery to BSL users and make informed choice a reality for members of the deaf community.