In order to generate high power laser radiation it is often necessary to combine multiple lasers into a single beam. The recent advances in high power spectral beam combining using multiplexed volume Bragg gratings recorded in photo-thermo-refractive glass are presented. The focus is on using multiple gratings recorded within the same volume to lower the complexity of the combining system. Comb...

In this article, a wideband watt-level digital power amplifier (DPA) with high efficiency and large dynamic range is presented in CMOS technology for wireless applications. To achieve output enhanced operation bandwidth (BW), the matching network based on reconfigurable power-combining transformer used. Meanwhile, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http:...

In this paper, we compare two X-band highefficiency switched-mode amplifiers designed around two commercially available packaged MESFET’s, one having a four times larger gate periphery than the other. The amplifiers using the larger and smaller devices are designed to operate in classes E and F, respectively. The smaller device gives 685-mW output power with 7.4-dB gain and 64% overall efficien...