Power scaling and experimentally fitted model for broad area quantum cascade lasers in continuous wave operation

Suttinger, Matthew; Go, Rowel; Figueiredo, Pedro; Todi, Ankesh; Hong, Su Jin; Leshin, Jason; Lyakh, Arkadiy

doi:10.1117/1.oe.57.1.011011

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…Future work should focus on the selection of an appropriate array element ridge width and interspace, the use of buried ridge waveguides, and the thermal management with micro-impingement coolers [ 28 ]. In addition, the reduced cascade number of the AR will make great contribution to the high duty cycle operation of high brightness QCLs [ 29 ].…”

Section: Discussionmentioning

confidence: 99%

Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

et al. 2018

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Power scaling in broad area quantum cascade laser (QCL) usually leads to the deterioration of the beam quality with an emission of multiple lobes far-field pattern. In this letter, we demonstrate a tapered QCL array integrated with Talbot cavity at one side of the array. Fundamental supermode operation is achieved in the arrays with taper straight-end connected to the Talbot cavity. Lateral far-field of the fundamental supermode shows a near diffraction limited beam divergence of 2.7°. The output power of a five-element array is about three times as high as a single-ridge laser with an emission wavelength of around 4.8 μm. However, arrays with the taper-end connected to the Talbot cavity always show a high-order supermode operation whatever Talbot cavity length is.

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Section: Discussionmentioning

confidence: 99%

Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

et al. 2018

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“…However, the maximum CW Popt and wp values were only 0.9 W and 5 %, respectively [55] since both Popt and wp are strong function of Np [12]. A similar scaling approach was applied to BH QCLs [58] by using 15-stage, broad-area BH devices, with the best result being 2.3 W single-facet CW power from 21 μm-wide ridges at  = 5.7 μm. As expected, Popt was limited since it is dependent on Np.…”

Section: Optical Output Powermentioning

confidence: 99%

“…The highest values for each growth method [8,59,60] occur in the 4.5-5.0 µm wavelength range because of low aw values and/or relatively high thermalconductance values and/or strong carrier-leakage suppression [12]. MBE-grown QCLs of NRE, vertical-transition design [58,60]…”

Section: Optical Output Powermentioning

confidence: 99%

High-Power Mid-Infrared (λ∼3-6 μm) Quantum Cascade Lasers

Mawst

Botez

2022

IEEE Photonics J.

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The performances of mid-infrared (IR) quantum cascade lasers (QCLs) are now reaching a maturity level that enables a variety of applications which require compact laser sources capable of watt-range output powers with high beam quality. We review the fundamental design issues and current performance limitations, focusing on InGaAs/AlInAs/InP QCLs with emission in the 3-6 m wavelength range. Metamorphic materials broaden the available compositions for accessing short emission wavelengths (≤3.5 m) or for integration with GaAs-and Si-photonics platforms. Conductionband engineering through the use of varying compositions throughout the active-region structure has been utilized to achieve the highest performance levels to date. Interface roughness scattering plays a dominant role in determining both the lower-laser-level lifetime as well as the carrier-leakage current. Numerous approaches have been implemented in attempts to control, scale, and stabilize the spatial mode to high output powers. Of all approaches photonic-crystal structures with high built-in index contrast, thus capable of maintaining modal properties under strong self-heating, are the most promising device configuration for achieving single-spatial-mode, single-lobe reliable CW operation to multiwattrange power levels. Such devices have demonstrated to date > 5W front-facet output powers with diffraction-limited beams in shortpulse operation.

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“…This beam quality is achievable via a narrow Fabry-Perot cavity, generally between 8 and 15 μm in width and 3-5 mm in length. Such form factors have led to incremental increases in efficiency [1,2,3] and associated increases in CW output power capabilities of research grade QCLs. However, remaining with this form factor will limit the amount of available power produced by the laser to single digit Watt emission.…”

Section: Introductionmentioning

confidence: 99%

Improving transverse mode quality of broad area quantum cascade lasers

Suttinger,

Go,

2024

Novel in-Plane Semiconductor Lasers XXIII

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Results of novel broad area QCL waveguides fabricated at Air Force Research Laboratory are discussed. An "ultrawide" Fabry-Perot waveguide design is modified to bring the waveguide mode closer to the electrical contact and splitting said contact into a Dual Contact Strip. The mode quality in the fabricated ultrawide device is rectified to fundamental-like behavior. Overlapped angled cavity waveguides with a low tilt angle, interrupted with "notches" etched out of areas far from the internal beam path of the fundamental mode, are designed and fabricated. The beam quality of the overlapped angled cavity array demonstrates coherence between outputs.

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Power scaling and experimentally fitted model for broad area quantum cascade lasers in continuous wave operation

Cited by 15 publications

References 9 publications

Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities

High-Power Mid-Infrared (λ∼3-6 μm) Quantum Cascade Lasers

Improving transverse mode quality of broad area quantum cascade lasers

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