Mid-Infrared 2-5um Master-Oscillator Power-Amplifier Lasers

We propose to design, construct, and optimize "master-oscillator power amplifier" (MOPA) lasers for the 2-5 um mid-infrared spectrum. These devices would have high output (>100Mw) and operate at or near room temperature. Our innovation is to use multiple quantum-wells in the AlGaAsSb/InGaAsSb materials systems in the design of MOPA mid-infrared semiconductor diode lasers. In Phase I, we would develop design rules for the quantum wells and optical structures and design a complete MOPA structure for the 3.3 um emission, a key wavelength for methane gas (CH4) detection. In Phase II, we would take advantage of our ongoing materials research with expitaxial layers of AlGaAsSb and InGaAsSb and fabricate a working MOPA laser for 3.3 um. We would optimize the power output and beam quality of this device and then apply this know-how to other wavelengths for gas spectroscopy, such as 4.2 um (carbon dioxide) and 4.6 um (carbon monoxide). Dr Ray Martinelli of the SRI David Sarnoff Research Center will consult on the project.