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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.

Optical gain in one-dimensional photonic band gap structures with n-i-p-i crystal layers

Nefedov I.S., Gusyatnikov V.N., Marciniak M., Kononenko V.K., Ushakov D.V.

Journal of Telecommunications and Information Technology

2002

nr 1

60-64

The gain enhancement in a layered periodic photonic band gap structure containing active medium based on GaAs n-i-p-i superlattices separated by A1GaAs layers is analyzed. The dependences of extinction coefficient and refractive index on excitation level and wavelength are presented. Transmission characteristics of a probe light versus excitation level are calculated. It is shown that the threshold of generation can be essentially reduced if the wavelength of probe light falls to the band gap edge.