37. саветовање CIGRE Србија (2025) СИГУРНОСТ, СТАБИЛНОСТ, ПОУЗДАНОСТ И RESILIENCE ЕЛЕКТРОЕНЕРГЕТСКОГ СИСТЕМА МУЛТИСЕКТОРСКО ПОВЕЗИВАЊЕ У ЕНЕРГЕТИЦИ И ПРИВРЕДИ – D1-04
АУТОР(И) / AUTHOR(S): Милан Игњатовић, Никола Вуковић, Никола Баста, Александар Милићевић, Александар Атић, Александар Демић
DOI: 10.46793/CIGRE37.D1.04
САЖЕТАК / ABSTRACT:
A frequency comb is a spectrum of electromagnetic radiation composed of discrete and regularly spaced spectral lines. In the time domain, this spectrum can correspond to a regular train of ultrashort pulses. In an optical frequency comb, the frequency spacing between the different modes lies in the part of the spectrum belonging to radio waves. In this way, a direct connection is established between radio waves and the optical part of the spectrum. Atomic clocks operate in the microwave region of the spectrum, and a frequency comb enables the transfer of the accuracy of such clocks to the optical part of the electromagnetic spectrum. The first frequency combs were implemented using mode-locked lasers. Recently, passive mode locking has been achieved in terahertz quantum cascade lasers using a graphene saturable absorber. Quantum cascade lasers are semiconductor lasers consisting of a multilayer periodic structure that forms an array of quantum wells. Laser emission is achieved via intraband transitions, and population inversion is obtained by applying an external electric field. To simulate the dynamics of quantum cascade lasers, it is necessary to solve Maxwell’s equations for the electromagnetic field in conjunction with the Bloch equations that describe the population of laser levels via the density matrix formalism. The equations have been successfully solved numerically in full form without using the slow-varying field approximation, which increases the number of spatial and time steps in the calculation. Ultrafast and intense terahertz light pulses represent a key technology for the development of materials science, enabling the generation of a frequency comb for high-precision metrology and spectroscopy.
КЉУЧНЕ РЕЧИ / KEYWORDS:
frequency comb, quantum cascade laser, Maxwell-Bloch equations
ПРОЈЕКАТ / ACKNOWLEDGEMENT:
Резултати овог рада су добијени током истраживања на пројекту „Генерисање ултра кратких импулса помоћу терахерцног квантног каскадног ласера који ради у режиму пасивног закључавања модова са графенским сатурабилним апсорбером“, 10504, финансираном од стране Фонда за науку Републике Србије при Програму за изврсне пројекте младих истражвача – ПРОМИС.
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