Lasers are essentially chaotic system. However, semiconductor lasers are classified into stable class B lasers. Meanwhile, they are easily destabilized by external perturbations (introduction of extra degree of freedom). We discuss chaos in lasers and also instability and chaos in semiconductor lasers. Recently, new semiconductor lasers with extra device structures have been developed and they ...

introduction: diode laser irradiation has recently shown promising results for treatment of gingival pigmentation. this study sought to compare the efficacy of 2 diode laser irradiation protocols for treatment of gingival pigmentations, namely the conventional method and the sieve method. methods: in this split-mouth clinical trial, 15 patients with gingival pigmentation were selected and their...

The rouge waves in an optically injected semiconductor lasers are receiving a lot of interest. In this work, the generating and controlling of the rogue waves in semiconductor lasers have been investigated. For this purpose, the laser’s rate equations are solved numerically in a specified time interval, then the field amplitude and the intensity versus time are calculated and analyzed. To solve...

Mutually-coupled semiconductor lasers are of great current interest because of the important insight they provide into coupled physical, chemical, and biological systems. Two semiconductor lasers either with or without optoelectronic feedback are mutually coupled together through optoelectronic paths. It is found that mutual coupling can signi cantly a ect the dynamics of the semiconductor lase...

Past research efforts have attempted to demonstrate semiconductor lasers with reduced levels of phase noise, approaching noise levels typically observed in highly coherent solid state lasers. In this work, detailed phase noise measurements have been performed on an expanded-mode, external cavity semiconductor laser with a longer cavity length and much higher output power than similar commercial...

We have generated picosecond opfic1 pulses with very pure spectral characteristics using semiconductor lasers with monolithic cavities. Fx repetition rates less than 10 GHz, gain-switching of DFB lasers with quantum well loss-gratings is usul. Monolithic colliding pulse mode-locked semiconductor lasers are used to generate short pulses with repetition rate up to 350GHz.