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19 November 2007 High power VCSEL device with periodic gain active region
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Proceedings Volume 6782, Optoelectronic Materials and Devices II; 67820O (2007)
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation, lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure, a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure, with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400μm-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16° were observed with current beyond 4.8A.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. Q. Ning II, L. Qin, Y. F. Sun, T. Li, J. J. Cui, B. Peng, G. Y. Liu, Y. Zhang, Y. Liu, L. J. Wang, D. F. Cui, and Z. Y. Xu "High power VCSEL device with periodic gain active region", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67820O (19 November 2007);

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