Mid-infrared diode lasers for free space optical communications

Yin, M. and Krier, A. and Krier, S. and Jones, Robert and Carrington, P. (2006) Mid-infrared diode lasers for free space optical communications. In: Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components Architectures for Microwave Systems and Displays. SPIE-INT SOC OPTICAL ENGINEERING, Stockholm, U101-U106. ISBN 978-0-8194-6497-2

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In this work we report on a specially optimized type-I InAsSb/InAsSbP double heterostructure (DH) ridge laser grown by liquid phase epitaxy (LPE). To remove residual impurities and reduce Shockley-Read recombination, the active region was purified using a Gd gettering technique. In addition free carrier absorption loss was minimized by the introduction of two undoped quaternary layers with the same composition of the cladding layers either side of the active region. The inserted layers also helped alleviate inter-diffusion of unwanted dopants towards the active region during or after growth and reduced current leakage of the device. The diode lasers operate readily in pulsed mode at elevated temperatures and emit near 3.45 mu m at 170 K with a threshold current density as low as 118 A/cm(2) at 85 K. Compared to the conventional 3-layer DH laser, the optimized 5-layer structure with reduced optical loss can raise the maximum lasing temperature by 95K to similar to 210K.

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07 Aug 2012 09:56
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17 Sep 2023 03:47