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Important features in meteor spectra are usually interpreted by synthetic convolution of lines extracted from databases. For such an assignment, in our study, we employed experimental technique of meteorite specimen laser ablation spectroscopy. The spectra are recorded by high resolution laboratory Echelle spectrograph and simultaneously using novel high resolution Meteor Spectral Camera for meteor...
Modulation instabilities discovered more than fifty and hundred fifty years ago created since then a framework for study complexity of different wave phenomena including turbulence and rogue waves. Using Erbium-doped fiber laser without any previously studied mode-locking mechanisms, here for the first time we demonstrate both experimentally and theoretically a new type of modulation instability,...
We report on a theoretical and experimental study performed on AlAs/GaAs micropillar cavities containing InGaAs quantum dots as active medium. The devices have the interesting property of having almost all emission (spontaneous and stimulated) channelled into one cavity mode. They are excellent experimental platforms for studying laser physics because their emission behaviours question our understanding...
Electrically tunable transformation of Bessel beams propagating along the optical axis of a barium-strontium niobate electro-optical crystal is theoretically investigated. Computer modeling showed the possibility of dynamic variation of the beam intensity at the output of an anisotropic crystal due to changes in refraction indices caused by the applied voltage. Controlling voltage required for the...
Optical communication technologies are the best solutions for the high-performance computing infrastructures (HPCs) and datacenter networks (DCNs). All-optical approach consists of switching all data at the packet in the optical domain which requires data rates higher than 100 Gbit/s. The quantum dot (QD) lasers are the promising candidates for such applications due to their high operation rates,...
Fiber lasers may exhibit instabilities and self-pulsed regimes that can have catastrophic consequences on their components. One of the self-pulsing regimes is the recently observed spontaneous laser line sweeping (SLLS). The SLLS is characterized by periodic wavelength drift over broad spectral interval of several nanometers followed by quick bounce backward. The sweeping rate is relatively slow,...
The linewidth enhancement (α-factor) of intersubband lasers was initially expected to be zero. However, nonzero values have been found in experimental investigations. This paper will give further details on how this controversy has been recently resolved by showing that counter rotating terms, usually ignored in simulations are the actual fundamental origin of nonzero α at peak gain even without inclusion...
The processes of absorption and stimulated emission are investigated via (i) energy conservation in a Fabry-Perot resonator, (ii) the Lorentz-oscillator model, and (iii) the Kramers-Kronig relations. Vacuum fluctuations are added and the relation between stimulated and spontaneous emission is clarified. It is shown that previous models start from incorrect assumptions about the physical foundations...
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