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30 October 2001 Ultrafast harmonic mode-locking of monolithic compound-cavity laser diodes incorporating photonic-bandgap reflectors
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Proceedings Volume 4598, Photonics Technology in the 21st Century; (2001)
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore
We present the first demonstration of reproducible harmonic modelocked operation from a novel design of monolithic semiconductor laser comprising a compound cavity formed by a 1-D photonic-bandgap (PBG) mirror. Modelocking is achieved at a harmonic of the fundamental round-trip frequency with pulse repetition rates from 131 GHz up to a record high frequency of 2.1 THz. The devices are fabricated from GaAs/AlGaAs material emitting at a wavelength of 860 nm and incorporate two gain sections with an etched PBG reflector between them, and a saturable absorber section. Autocorrelation studies are reported, which allow the device behaviour for different modelocking frequencies, compound cavity ratios, and type and number of intra-cavity reflectors to be analyzed. The highly reflective PBG microstructures are shown to be essential for subharmonic-free modelocking operation of the high-frequency devices. We have also demonstrated that the multi-slot PBG reflector can be replaced by two separate slots with smaller reflectivity. These lasers may find applications in terahertz imaging, medicine, ultrafast optical links, and atmospheric sensing.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dan A. Yanson, Michael W. Street, Stewart D. McDougall, Iain G. Thayne, John H. Marsh, and Evgenii A. Avrutin "Ultrafast harmonic mode-locking of monolithic compound-cavity laser diodes incorporating photonic-bandgap reflectors", Proc. SPIE 4598, Photonics Technology in the 21st Century, (30 October 2001);


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