We investigate the origin of line-shape induced enhancement stimulated Brillouin scattering (SBS) in narrow linewidth, noise broadened, high-power fiber lasers. A polarization-maintaining seed laser with continuously tunable linewidth (single frequency to >10 GHz), based on white modulation was developed for this study. With increasing linewidths, a substantial difference SBS thresholds observe...

We report theoretical results on the wavelength stability of a multisection master-oscillator power-amplifier emitting at 1064 nm. use traveling wave equation model to calculate optical output power and spectral maps versus currents injected into different sections device. The numerical explains quantitatively experimental findings, particularly collapse if current control section adjacent dist...

20 where K is a coefficient which is given by gain, the size of a laser diode, internal quantum efficiency, and a confinement factor; ae,f is an internal loss; Re and R, are the reflectivities of the etched and cleaved facets, respectively. We can evaluate Re by measuring the threshold current as a function of the cavity length and by using a typical value of 0.32 for R,. The results are shown ...

We show that spoof surface plasmons can be used to control the reflection of terahertz radiation at the output facet of a parallel-plate waveguide. Using a periodic groove pattern on the output face, reflectivity approaching 100% can be achieved within a limited spectral range. Unlike the conventional geometry for plasmon-enhanced transmission, this approach enables a unique method for studying...

few studies can be found which have directly addressed the issue of burn-out by considering the influence of teachers’ coping resources such as emotional intelligence and reflectivity especially in an efl context. therefore, in order to bridge this gap, the present study was conducted to investigate the relationship among teachers’ burnout, emotional intelligence, and reflectivity with a sample...