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Cambridge, MA, United States

Agency: Department of Homeland Security | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 99.72K | Year: 2011

EOS Photonics, in collaboration with the group of Prof. Capasso at Harvard University, proposes to develop a novel widely tunable, high power quantum cascade laser source for remote sensing applications. The tuning mechanism relies on the integration of intersubband tuning elements fabricated monolithically with DBR gratings to ensure electrically-controlled wavelength tuning over a wide wavelength range and with excellent mode suppression ratio.

A spectroscopy system includes an array of quantum cascade lasers (QCLs) that emits an array of non-coincident laser beams. A lens array coupled to the QCL array substantially collimates the laser beams, which propagate along parallel optical axes towards a sample. The beams remain substantially collimated over the lens arrays working distance, but may diverge when propagating over longer distances. The collimated, parallel beams may be directed to/through the sample, which may be within a sample cell, flow cell, multipass spectroscopic absorption cell, or other suitable holder. Alternatively, the beams may be focused to a point on, near, or within the target using a telescope or other suitable optical element(s). When focused, however, the beams remain non-coincident; they simply intersect at the focal point. The target transmits, reflects, and/or scatters this incident light to a detector, which transduces the detected radiation into an electrical signal representative of the targets absorption or emission spectrum.

Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 99.20K | Year: 2011

A new technique is proposed for improved trace gas detection and measurement that combines the high absorption depths afforded by mid-infrared Integrated Cavity Output Spectroscopy (ICOS) with the added precision and sensitivity of Frequency Modulated Spectroscopy (FMS). To our knowledge, the two-tone FM technique described and prototyped in this proposal is the first demonstration of this combination. This proposal requests funding to advance on the breakthrough preliminary work shown here and to fully realize FM ICOS as a means to achieve one a one order of magnitude increase in detection precision compared to the very sensitive ICOS technique, enabling a new era of trace gas quantification including isotope ratio determinations of carbon, nitrogen and oxygen species.

Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 149.27K | Year: 2014

The objective of the present program is to develop a lambda ~ 4.6 microns source based on a stack of QCL bars with unprecedented power level exceeding 100 Watts while maintaining good beam quality. The solution proposed needs to be (1) compatible with beam combining solutions and (2) scalable to the kilowatt level. Eos Photonics proposes to leverage its experience building, cooling and packaging 1-D QCL array, in order to assemble several such bars into a 2D stack. Detailed mechanical and thermal modeling will be required to properly size the different components. Keeping in mind the constraints posed by the very large thermal load, Eos will find materials, and mounting procedures minimizing the mechanical stress on the laser array and also minimizing SMILE. Eos will also investigate potential failure mechanisms and find mitigating solutions. All design parameters as well as their expected deviations (from mounting error, thermal effects or mechanical stress) will be evaluated in the context of the beam combining solution identified to maintain an excellent beam quality.

Agency: Department of Defense | Branch: Army | Program: STTR | Phase: Phase I | Award Amount: 149.63K | Year: 2014

To achieve the goals of this program improving spectral coverage and output power of monolithic QCL sources as well as the development of a production and manufacturing plan - we propose to develop in collaboration with MIT Lincoln Laboratory a broadly tunable high power source that is based on Eos"proprietary QCL array technology. The current generation of Eos"commercially available fully packaged QCLAs ("The Matchbox") can be tuned over a wavelength range of up to 200 cm-1. The development of the proposed next generation QCLA source with increased power level and spectral breadth will strongly benefit from Eos"s unique expertise and experience in design and fabrication of monolithic QCL sources.

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