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1.  Dr. Timothy Day, Daylight Solutions, USA
Late-Breaking Results: Late Breaking Results with Ultra Broad Tuning in External Cavity Quantum Cascade Lasers
Speaker Biography: Timothy Day: is a co-founder of Daylight Solutions and serves as the CEO and CTO for the company. Daylight Solutions is a manufacturer of advanced molecular detection and imaging products, serving markets that include Industrial Process Control, Medical Diagnostics, Defense and Security, and Fundamental Research using mid-IR lasers and sensor systems. Dr. Day has over 20 years' experience in both technical and business management in the photonics industry. He has led engineering, research, product development, manufacturing, and marketing operations. He started his career as a co-founder of New Focus, where he served from 1990 through 2004. During his time at New Focus, he was involved in all aspects of the company’s history, concluding with his work on the sale of the company to Bookham Technology PLC for $338M. While at New Focus he also contributed to the raising of over $500M though public and private equity offerings. From 1990 to the present, while at New Focus and Daylight Solutions, Dr. Day has developed extensive patent and product portfolios and transferred numerous products into production, both onshore and overseas.

Summary: The mid-IR portion of the electromagnetic spectrum (~3-20 µm) is a feature-rich spectroscopic region. Most molecules have fundamental vibrational transitions in this region that are typically 30-1000 times stronger than overtones or combination bands that occur in the more easily accessible visible and near-infrared portion of the spectrum. Molecules with absorption bands in the mid-IR are of interest for a wide range of applications, from environmental monitoring to defense and security to bio-medical diagnostics. Many of these applications benefit from a source with broad tuning across the mid-IR range with both a narrow linewidth and broad wavelength tuning. One approach to controlling the linewidth and frequency of a QCL is to grow a Bragg Reflector epitaxially onto the surface of the waveguide. By controlling the temperature of the gain chip, this Distributed Feedback (DFB) system can be used to tune with narrow linewidth over a limited frequency range (~ 5-15 cm-1). Multiple DFBs can be combined on a device to expand the tuning range. Much more of the available gain bandwith may be exploited with even narrower linewidth by employing an External Cavity. Over 525 cm-1 of single mode tuning from a single QCL chip at 4.2 microns has been achieved, representing tuning of 22% of the center bandwidth. Late-breaking results exceeding tuning over 40% of the center wavelength will be presented.
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