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Cambridge, MA, United States

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: 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.

Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 79.99K | Year: 2015

We envision a coherently coupled QCL array architecture featuring 2nd order DFB gratings to vertically couple out light with excellent beam quality and high output power. This approach does not require cleaving of the devices or facet coatings and is therefore inherently more robust and manufacturable than facet emitters. Additionally, we will implement electronically-controlled tuning elements to allow for fast broadband tuning of the emission wavelength.

Agency: Department of Defense | Branch: Navy | Program: STTR | Phase: Phase I | Award Amount: 149.40K | Year: 2011

EOS Photonics proposes to develop, together with MIT- Lincoln Laboratories, the next generation of high power quantum cascade laser (QCL) source with output power exceeding 15 Watts at a wavelength of 4.6 microns. The proposed subsystem will include a DFB QCL array integrated monolithically with power amplifiers, low-loss passive waveguides and optical elements aimed at realizing on-chip wavelength beam combining. The design parameters will be explored to maximize output power and wall plug efficiency while minimizing the number of integrated elements necessary. Paths to reach power levels exceeding 50 Watts will be explored, as well as methods to manufacture the laser systems with high production yield.

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