1. Milesa Srećković, Elektrotehnički fakultet, Univerzitet u Beogradu, Bulevar Kralja Aleksandra 73, Serbia
2. A. A. Ionin, Lebedev Institute, Moscow, Russian Federation
3. Aco Janicijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Srbija, Serbia
4. Aleksandar Bugarinović, 2Telekom Srpske, Bijeljina, Republika Srpska, B i H, ,
Republic of Srpska, Bosnia and Herzegovina
5. S. Ostojić, Faculty of Technology and Metallurgy, Belgrade, Serbia
6. Mirjana Janićijević, Univerzitet u Kragujevcu, Srbija, Fakultet Medicinskih Nauka,, 7. N. Ratković Kovačević, High technical school, Požarevac, Serbia, Serbia
During six decades of quantum electronics, a vast number of new types of quantum generators were developed. Although the principle of population inversion united different ranges of electromagnetic spectra (and respective quantum generators), the existence of title laser without the inversion population, it seems exception makes the rule, meaning this title deserves a discussion.
Developing formalisms describing the operation of quantum generators, at this time exist several approaches, which must have a quantum mechanics base. For practical reasons, negative coefficient of absorption is acquired using classic electromagnetics also, but for the population purposes quantum presentation must be entered.
A few levels of formalisms will be set, linked to quantum generators accenting the optical portion of spectra in this paper. The descriptions on lowest level will be shown including equivalent lumped circuits. This range could be widened to other equivalents of physical problems, using developed programs packages in electrical engineering (Spice, etc.). Schematics are at the level of macroscopically as well as on microscopically defined equivalent values (atomic – electronic levels). The kinetic equations with of simple approach will be considered as well as simplified laser equations based on quantum semi-quantum approaches. The use of Fourier analysis, appropriate transformations the main five laser equations are acquired giving the base for various working regimes of quantum generators and amplifiers (free generation regime, Q switch, synchronization, operation with filters, two modes regime, regime with losses, etc.). The Ljapunov’ theory of stability has to be included here, etc.
For some of the chosen types, analytical modeling will be analyzed as well as results of program packages developed for lasers dynamics, regimes and parameters. The systems pumped with electronic beams (relativistic) will be considered and the nuclear physics attitude which must be set at the beginning, for needed parts of the condensed – solid state theory and laser techniques to be included, after slowing down towards thermal energies.
Existing program packages give the opportunity for fast modeling and depiction of laser energy distribution, temperature, modes, etc. both in active material and in resonator. For special geometries a modeling will be done and a temperature distribution acquired during operation of chosen laser system in active material, too. A comparison of different pump geometries will be performed. Contemporary lasers with shortest existing pulse durations demand new formalisms. Areas of nonlinear optics and quantum electrodynamics, Glauber’s states and similar, are areas itself witch must be included. Two main formalisms thermodynamic and quantum mechanical with transition probabilities using perturbation methods and secondary quantization naturally had to be complemented if more generally are included Brillouin, Raman, Compton, soliton, fiber and other lasers.
Ključne reči :
Tematska oblast:
SIMPOZIJUM A - Nauka materije, kondenzovane materije i fizika čvrstog stanja
Datum:
15.07.2016.
Contemporary Materials 2016 - Savremeni Materijali
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