The present study aimed to evaluate the optical properties of 1D photonic crystal (PC) with a defect layer doped by four-level InGaN/GaN quantum dots. Transient and steady-state behavior of the medium completely relies on the intensities and relative phases of coherent coupling fields. In addition, the transient absorption–dispersion spectra of 1DPC can be easily adjusted by choosing the controllable parameters properly. Furthermore, the transmitted and reflected light pulses at λ = 1.55 μ m (long wavelength) can be tuned by controlling the Rabi frequencies of applied light due to their potential applications in all-optical systems. Furthermore, the effect of relative phase between applied fields on the light propagation was evaluated through the medium. In addition, all-optical switching time was found for subluminal/superluminal and absorption/transmission of light propagation. The required switching time ranges between 2–7 ps. The proposed model may provide some new possibilities for technological applications in optoelectronics and solid-state quantum information science and systems due to large applications in signal processing.

No abstract

No abstract

No abstract

The thermal interaction of lasers with matter is studied in this work. Using the Green's function approach, equations governing this interaction are solved semi-analytically. Real conditions, such as the temperature dependence of thermal coefficients, and the surface radiation of matter, were taken into account when solving these equations. A computational code was written in the C programming language to simulate the problem. The proposed method decreases both calculation and simulation times considerably. The proposed method and the developed code are validated by experimental tests, and by means of comparison with another previously-published approach. Since a combination of numerical and analytical methods are used, the developed code is much faster than the numeric software. In addition, the proposed method is more accurate than analytical methods, due to the use of nonlinear boundary conditions. The thermal effects of a CW fiber laser on Al is also investigated. Results show that there is a threshold power density for achieving a melting point due to surface radiation. Higher power densities result in a shorter interaction time to achieve a melting point.