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On the beam radiance of mid-infrared quantum cascade lasers : a review

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Mroziewicz B. , Pruszyńska-Karbownik E.

Opto-Electronics Review

2019

tom Vol. 27, No. 2

161--173

Lasers emitting mid-infrared (MIR) beams have become indispensable for spectroscopy, free space communication or remote security measures. To the one of the most promising families of the lasers suitable for these applications certainly belongs a group of the Quantum Cascade Lasers (QCL). However, among the conditions they must satisfy there is a high enough radiance of the beam they emit. Radiance depends in a complicated way on the laser output power and optical quality of the laser beam. This paper has been devoted to a description and a short analysis of the factors that decide about radiance of so far developed QCLs. Literature concerning both single devices and QCL arrays operating in beam combining systems have been examined and results described. The survey may be useful for estimation of how far the QCLs have come of age.

A simple and precise method for the threshold current determination in vertical-cavity surface-emitting lasers

70%

Pruszyńska-Karbownik E. , Gębski M. , Marciniak M. , Lott J. A. , Czyszanowski T.

Optica Applicata

2020

tom Vol. 50, nr 2

281--288

In this paper, we present experimental results of spontaneous emission clamping in the threshold for vertical-cavity surface-emitting lasers (VCSELs) with oxide current confinement. We show that the spontaneous emission not wholly clamps in the threshold. We propose a new method for determining the threshold current value using the study of the clamping phenomena. This method has an advantage over the commonly used methods in the accuracy because the current of the spontaneous emission clamping is betted defined than the current of the slope change of the stimulated emission light-current curve. The estimated uncertainty of the method is no more than 20 μA.