MIOMD-XI Speakers    
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1.  Dr. Siamak Forouhar, Jet Propulsion Lab, USA
Invited Talk: Record high-power laterally coupled distributed-feedback lasers in the 2–3 μm wavelength range
Speaker Biography: Siamak received his Ph.D. in Electrical Engineering from the University of California, San Diego in 1983. In 1987, he joined the Jet Propulsion Laboratory in 1992. During his tenure at JPL he developed the world's first InGaAs strained layer laser in the 1.8-2.1 micron range and lead the delivery of those lasers to Mars 98' mission. He is currently the Deputy Director of Microdevices Laboratory at JPL and still leads a group developing unique semiconductor lasers for space applications. He has been awarded the NASA Exceptional Engineering Achievement Award for the development of tunable diode lasers for planetary in-situ studies.

Summary: Lasers operating in the 2.0-3.0 μm spectral range are of particular interest for spectroscopy and atmospheric studies. High-performance semiconductor lasers have been demonstrated in this wavelength range based on InGaAsSb/AlGaAsSb alloys. Typically, these structures employ molecular-beam epitaxy (MBE) to grow compressively strained multi-quantum-well active layers of InGaAsSb sandwiched between lattice-matched AlGaAsSb waveguide layers on GaSb substrates. In spite of excellent results reported on broad-area and Fabry-Perot lasers, the development of single-frequency lasers suitable for gas spectroscopy has been limited. Conventional fabrication of DFB lasers incorporating buried gratings for longitudinal mode selection is extremely challenging due to the difficulty of epitaxial regrowth over GaSb alloys. An alternative method for DFB fabrication makes use of Bragg gratings etched alongside a ridge waveguide to form a laterally coupled distributed-feedback (LC-DFB) laser. This approach enables fabrication of single-longitudinal-mode lasers following a single epitaxial growth process. However, all the demonstrated lasers to date have relied on deposited metal gratings that provide strong feedback but generate additional absorption loss in the laser cavity, which limits the output power of the lasers to only few milliwatts. In this work, we report on high-power LC-DFB lasers with etched gratings.
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