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Stony Brook, NY, United States

Liang R.,State University of New York at Stony Brook | Chen J.,State University of New York at Stony Brook | Kipshidze G.,State University of New York at Stony Brook | Westerfeld D.,Power Photonics Corporation | And 2 more authors.
IEEE Photonics Technology Letters | Year: 2011

High-power 2.2-mμ diode lasers and their arrays were designed and fabricated. Laser heterostructures were grown using solid-source molecular beam epitaxy on GaSb substrates. The device active regions contained two 1.5% compressively strained GaInAsSb quantum wells. Heavy compressive strain in the active region ensured strong carrier confinement and high differential gain. A broadened waveguide design approach was utilized to obtain an internal optical loss below 4 cm-1 and a threshold current density below 100 A/cm 2. Individual high-power lasers produced 1.6 W of continuous-wave (CW) multimode power at room temperature from a single 100-μm-wide aperture. Linear laser arrays generated more than 25 W of quasi-continuous wave output power. The device power conversion efficiencies were better than 20% in peak and above 10% at maximum output power level. © 2011 IEEE.


Patent
Power Photonics Corporation | Date: 2015-07-01

An LED optimized for use in low-cost gas or other non-solid substance detection systems, emitting two wavelengths (colors) of electromagnetic radiation from the same aperture is disclosed. The LED device emits a light with a wavelength centered on an absorption line of the target detection non-solid substance, and also emits a reference line with a wavelength that is not absorbed by a target non-solid substance, while both wavelengths are transmitted through the atmosphere with low loss. Since the absorption and reference wavelengths are emitted from the same exact aperture, both wavelengths can share the same optical path, reducing the size and cost of the detector while also reducing potential sources of error due to optical path variation.


Jung S.,State University of New York at Stony Brook | Suchalkin S.,State University of New York at Stony Brook | Suchalkin S.,Power Photonics Corporation | Kipshidze G.,State University of New York at Stony Brook | And 4 more authors.
IEEE Photonics Technology Letters | Year: 2013

Light-emitting diodes emitting near 2 \mu{\rm m} producing quasi-continuous wave optical power of {>}{\rm 10}~{\rm mW} at room temperature have been demonstrated. The combination of a strain-engineered quantum well active region and a cascaded injection scheme made it possible to achieve an internal efficiency of 120%. The higher wall plug efficiency of the two-cascade devices indicates that Auger recombination is primarily responsible for the efficiency drop at high injection levels. © 2013 IEEE.

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