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Output Spectrum Tu na ble La se r A rra y Gas Sample MCT Detector I I Input Spectrum Lock-in Amplifier IR absorption spectroscopy of chem/bio agents High Intensity Mid and Far Infrared Laser Array for Chem/Bio Agent Detection/LADAR/Optical Communication Applications Army Issues and Technological Impact High intensity and high average power mid and far InfraRed (IR) lasers (3-20 m) are excellent candidates for a variety of defense applications.

Infrared imaging countermeasure.

Missile countermeasure.

Multi-spectral sensing of remote objects.

Laser radar.

Deceptive radar jamming.

Free-space optical communication link.

High-sensitivity chemical/molecular spectroscopy.

Technical Concept The Quantum Cascade (QC) lasers exhibit emission wavelengths which can be specified (3-20 m) by quantum mechanical design. The Cr2+:ZnSe lasers are of interest as mode-locked coherent sources exhibiting very broad emission band and near unity quantum efficiency at room temperature in the 2-3 m region. The main objective is to integrate these lasers into a synchronized array of high power coherent IR signal source. These high power laser sources can be used for laser radar detection, radar jamming, and missile countermeasure applications.

In the mid-IR region only few laser sources are established for high-resolution spectroscopy for biological/chemical agent detection. Both QC and ZnSe lasers are tunable with narrow linewidths ( = 0.1 cm-1 for QC) and can be used for high sensitivity (~100 ppb) spectroscopic analysis.

Computer Science and Mathematics Division T IR ra da r ja mm er Missile countermeasure Development Approach Additional research and development are needed to design IR lasers, achieve high power emission, and meet military performance criteria. This goal will be accomplished in two phases.

Phase I: Integrated optics task will be performed to fabricate GaAs-based QC and ZnSe-based chalcogenide lasers. Fabrication processes will be developed for the optimization of lasing parameters (average optical power, threshold current etc.) at room temperature.

Phase II: Techniques to mode lock arrays of lasers (developed at CESAR) in pulsed (LADAR application) and CW (spectroscopic application) will be applied to synchronize large arrays of lasers. High intensity and high average power laser sources will be demonstrated by coherently combining the synchronized lasers.

Facilities ORNL researchers of CESAR have developed a facility for synchronizing high power lasers. A strong and capable team with broad research qualifications in laser arrays, optics, photonic materials, and laser performance modeling has been assembled in collaboration with Fisk University. The facility at CESAR has numerical modeling tools and state-of-the-art equipment including optical tables, digital oscilloscope, two-channel power and energy meters, monochromator, infrared monitoring devices, single frequency diode lasers, high power diode laser arrays, diode laser isolators etc. Collaborators at Fisk present expertise in ZnSe-based laser material fabrication. The integrated team is capable of simulating, rapid prototyping, and a wide range of testing of the laser system.

Related Programs Technological outcomes of this research can be utilized for a variety of national defense and security missions. This project integrates material science and laser optics and presents collaboration among a diverse group of scientists.

Point of Contact: Y. Braiman Center for Engineering Science Advanced Research (CESAR) Computer Science and Mathematics Division Oak Ridge National Laboratory P.O.Box 2008 Oak Ridge, TN 37831-6355 865-241-2065

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