High-Temperature Operation of a Quantum Cascade Laser With Definite Parity of the Wave Functions

Kato, Takashi; Mori, Hajime; Yoshinaga, Hiroyuki; Souma, Satofumi

doi:10.1109/lpt.2021.3071484

Cited by 1 publication

(1 citation statement)

References 16 publications

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“…( 12)] decreases with decreasing Np [54,55] since the threshold-power density decreases with decreasing Np. From 10-stage, 30-wide ridge-waveguide, 4.6 μmemitting devices CW operation was obtained to above 100 o C [54], something that only BH devices have been able to achieve [2,56,57]. 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].…”

Section: Optical Output Powermentioning

confidence: 98%

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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