Single-section quantum dash semiconductor lasers have attracted much attention as an integrated and simple platform for the generation of THz-wide flat optical frequency combs in telecom C-band. In this work, we present experimental method allowing to increase spectral width laser comb by injection a broadband noise from external amplifier that is spectrally overlapped with comb. The induces am...

The Bennett hole is analysed for a medium of two-level particles with weak collisions beyond the scope of the perturbation theory. In the limit of small homogeneous width, the analytical expression for the hole shape is of the form of a Bessel function. The result is compared with data obtained by the variational approximation and numerical calculation. It is shown that the approximation gives ...

The diagonalization algorithm in VASP, Davidson block iteration scheme, produced discontinuous potential energy curve and even diverged at some distances using standard settings in VASP, due to the multi-reference nature of the system (see manusript). We attempted to improve the convergence and we increased the width of the smearing σ , which determines how the partial occupancies are set for e...

first approximation. The resonant scattered gamma-ray distribution is shown in Fig. 2 for a source strength of 20 millicuries. The ratio of the 837-kev to 961-kev photopeaks is 1.8 which is in agreement with the ratio of the p rays before scattering, 1.4, corrected for detection e%ciencies and for the different angular distributions of the scattered gamma rays at 100'—the mean angle of scatteri...

Abstract The injection of electron cyclotron (EC) waves fulfills a number important tasks in nuclear fusion devices for which detailed knowledge the spatial power deposition profile is critical. This commonly determined using forward models such as beam or ray tracing. Recent numerical and experimental studies have shown that small-angle scattering EC it passes through turbulent plasma edge can...

Abstract A quasilinear operator for wave–particle interactions in the electron cyclotron range is derived using cold plasma dispersion relation. The finite width of beam implies a broadening resonance layer velocity space which allows use numerically efficient treatment operator. specific case pure heating injected at outer mid-plane then treated. It to treat propagation and absorption easily, ...

The secondary electron spectrum (SES) contains complex surface information and is widely used in analysis technology. A theoretical model of the SES for metals was proposed to reveal effect potential barrier on SES. In our model, an improved inner energy distribution established according free gas model. transmission coefficient electrons determined by solving density electronic states. Finally...

The lasing characteristics of InP-based InAs/In 0.53 Ga 0.47 As quantum well (QW) lasers with different ridge widths are investigated. Two groups grown for comparison, one active triangular QW regions and the other rectangular regions. Their output powers, characteristic temperatures ( T 0 ), external differential efficiencies η d ) junction j analyzed compared. parameter width is found to play...