12 July 2006 High brilliance photonic band crystal lasers
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Proceedings Volume 6350, Workshop on Optical Components for Broadband Communication; 635005 (2006) https://doi.org/10.1117/12.693348
Event: Workshop on Optical Components for Broadband Communication, 2006, Stockholm, Sweden
Abstract
High concentration of optical power in a narrow exit angle is extremely important for numerous applications of laser diodes, for example, for low-cost fiber pumping and coupling, material processing, direct frequency conversion, etc. Lasers based on the longitudinal photonic band crystal (PBC) concept allow a robust and controllable extension of the fundamental mode over a thick multi-layer waveguide region to achieve a very large vertical optical mode spot size and, consequently, a very narrow vertical beam divergence. Many undesirable effects like beam filamentation, lateral multimode operation and catastrophic optical mirror damage (COMD) are strongly reduced. 650 nm GaInP/GaAlInP PBC lasers show narrow far field pattern (FWHM~7°) stable up to the highest output powers. Differential efficiency up to 85% is demonstrated. Total single mode output power as high as 150 mW is achieved in 4 μm-wide stripes in continuous wave operation, being limited by COMD due to not passivated facets. The lateral far field FWHM is 4 degrees. 840 nm GaAs/GaAlAs PBC lasers show a vertical beam divergence of 8° (FWHM) and a high differential efficiency up to 95% (L=500 μm). A total single mode CW power approaches 500 mW for 1 mm-long 4 μm-wide stripes devices at ~500 mA current, being COMD-limited. The lateral far field FWHM is 5 degrees. Another realization of a longitudinal PBC laser allows lasing in a single high-order vertical mode, a so-called tilted mode, which provides wavelength selectivity and substantially extends the possibility to control the thermal shift of the lasing wavelength. In a multilayer laser structure, where the refractive index of each layer increases upon temperature, it is possible to reach both a red shift of the lasing wavelength for some realizations of the structures, and a blue shift for some others. Most important, the absolute thermal stabilization of the lasing wavelength of a semiconductor laser can be realized.
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V. A. Shchukin, V. A. Shchukin, N. N. Ledentsov, N. N. Ledentsov, N. Yu. Gordeev, N. Yu. Gordeev, L. Ya. Karachinsky, L. Ya. Karachinsky, N. V. Kryzhanovskaya, N. V. Kryzhanovskaya, S. M. Kuznetsov, S. M. Kuznetsov, M. B. Lifshits, M. B. Lifshits, M. V. Maximov, M. V. Maximov, I. I. Novikov, I. I. Novikov, Yu. M. Shernyakov, Yu. M. Shernyakov, T. Kettler, T. Kettler, K. Posilovic, K. Posilovic, D. Bimberg, D. Bimberg, } "High brilliance photonic band crystal lasers", Proc. SPIE 6350, Workshop on Optical Components for Broadband Communication, 635005 (12 July 2006); doi: 10.1117/12.693348; https://doi.org/10.1117/12.693348
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