Optical guiding properties of high-brightness parabolic bow-tie laser arrays
D. Masanotti,F. Causa +1 more
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In this article, the characteristics of parabolic bow-tie laser arrays (PBTLAs) are presented, which are a novel category of laser diodes specially designed to achieve high power with high brightness at 980 nm.Abstract:
This paper presents the characteristics of parabolic bow-tie laser arrays (PBTLAs) which are a novel category of laser diodes specially designed to achieve high power with high brightness at 980 nm. Output powers in excess of 2.8 W/facet have been measured from five-element PBTLAs with output beam less than twice the diffraction limit, achieving high brightness of 275 MWcm/sup -2/srad/sup -1/ at 3 A (pulsed) injection current (=22 times the threshold). Changes in the achievable brightness due to changes in the optical cavity geometry and in the lateral optical guiding strength are discussed in detail, using the coupled-mode theory to interpret the experimental results. At threshold all devices operate in the highest (double lobed) array mode. At higher currents the arrays of tapered lasers change to quasi-in-phase operation when the modal gain of the fundamental array mode dominates because of the combined effect of carrier hole burning and spatial filtering from the narrow stripe central section of the device. Similar trends have been observed under continuous-wave operation. The reduction of lateral optical guiding strength is deleterious for the operational characteristics of PBTLAs and linear bow-tie arrays, and it leads to filamentation in gain-guided devices even at low currents. Theoretical results presented in this paper show that scalability is in principle possible; however, changes in the lateral gain profile due to hole-burning can significantly increase the modal gain of higher order modes and, therefore, strongly influence the optical output profile.read more
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Journal ArticleDOI
Design and Simulation of Next-Generation High-Power, High-Brightness Laser Diodes
Jun Jun Lim,Slawomir Sujecki,Lei Lang,Zhichao Zhang,David Paboeuf,Gilles Pauliat,Gaëlle Lucas-Leclin,Patrick Georges,Roderick C. I. MacKenzie,P.J. Bream,S. Bull,K.-H. Hasler,Bernd Sumpf,Hans Wenzel,G. Erbert,B. Thestrup,Paul Michael Petersen,Nicolas Michel,Michel Krakowski,Eric C. Larkins +19 more
TL;DR: In this paper, the brightness limitations of broad-area laser diodes, including the use of asymmetric feedback to improve the modal discrimination, are investigated, with an emphasis on emerging device technologies for applications requiring electrical modulation and high spectral brightness.
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On-chip coherent combining of angled-grating diode lasers toward bar-scale single-mode lasers
Yunsong Zhao,Lin Zhu +1 more
TL;DR: This article has demonstrated a novel integrated laser architecture in which Bragg diffraction is used to realize simultaneous modal control and coherent combining of broad-area diode lasers.
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Lateral-Longitudinal Modes of High-Power Inhomogeneous Waveguide Lasers
TL;DR: In this article, the authors show that corrugations of the stripe boundaries along the longitudinal direction cause discrimination of the lateral modes in stripes which are typically wider than those supporting single lateral mode emission.
Journal ArticleDOI
Observation and Analysis of Phase-Locking in Parabolic Bow-Tie Laser Arrays
F. Causa,D. Masanotti +1 more
TL;DR: In this paper, it was shown that in-phase coherent coupling occurs in high-power arrays of parabolic bow-tie lasers for high-brightness operation at 980 nm, and the maximum brightness achieved was 318 MWmiddotcm-2 sr-1 at 20 times the threshold with far-field full-width at half-maximum less than 1.5 times the diffraction limit.
Patent
Device comprising a laser
TL;DR: In this paper, a waveguide stripe has at least one corrugated edge section along its longitudinal axis to provide preferable amplification of the fundamental lateral mode or inphase supermode and to obtain high brightness of the emitted radiation.
References
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Proceedings ArticleDOI
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Journal ArticleDOI
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TL;DR: In this paper, a theoretical analysis of beam instability (steering) commonly observed in high power ridge waveguide laser diodes is presented, and a physical model of multiple interfering lateral modes is proposed and implemented in a two-dimensional self-consistent numerical code.
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