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The operation of THz quantum cascade laser in the region of negative differential resistance

Khabibullin R. A., Shchavruk N. V., Ponomarev D. S., Ushakov D. V., Afonenko A. A., Maremyanin K. V., Volkov O. Y., Pavlovskiy V. V., Dubinov A. A.

Opto-Electronics Review

2019

Vol. 27, No. 4

329--333

We investigate the light-current-voltage characteristics and emission spectra of 2.3THz quantum cascade laser operating in the negative differential resistance (NDR) region. It was shown that the formation of electric field domains (EFDs) leads to a large number of discontinuities on the current-voltage and the total optical power on current characteristics. Measurements of emission spectra at different current (before the NDR region and in the NDR region) shows that the formation of EFDs results in decrease of the output intensity, but does not influence on lasing frequencies. The performed calculations qualitatively explain the experimental results.

Asymmetric multiple quantum well heterostructure laser systems : conception, performance, and characteristics

Kononenko V. K., Afonenko A. A., Manak I. S., Nalivko S. V.

Opto-Electronics Review

2000

Vol. 8, No. 3

241-250

A new type of laser diodes and amplifiers based on asymmetric quantum-well heterostructures having active layers of different thickness and / or compositions has been considered. Bistable switching and regimes of regular radiation pulsation at two or three remote wavelengths in the range 790 - 850 nm in the GaAs-AlGaAs bi- and triple - quantum-well heterostructures are described. Influence of non-linear processes including gain suppression due to carrier heating on lasing regimes has been examined. Transformation of gain bands for TE and TM modes in dependence on the pump current has been studied for asymmetric four-quantum-well structures. The interval of tuning amplification wavelengths in the system reaches up to 70 nm.