Using passive coherent beam combining of two ultrafast fiber amplifiers, we demonstrate the generation of high temporal quality 300 fs and 650 μJ pulses corresponding to 60 W of average power at a repetition rate of 92 kHz. Furthermore, at 2 MHz of repetition rate record coherent combining average powers of 135 W before and 105 W after compression are measured. A combining efficiency higher tha...

Beam combining techniques have become an important tool in design of high-power highbrightness laser systems [1]. Maximum power that can be obtained from single high-power amplifiers is usually limited by thermal distortion of active medium and beam quality degradation in solid-state lasers or non-linear effects and active fiber damage in fiber lasers. Beam combining offers an alternative solut...

Up to 16 W output power has been obtained using spectral beam combining of two 1063 nm DBR-tapered diode lasers. Using a reflecting volume Bragg grating, a combining efficiency as high as 93.7% is achieved, resulting in a single beam with high spatial coherence. The result represents the highest output power achieved by spectral beam combining of two single element tapered diode lasers. Since s...

Certain properties of streptolysin in respect of hemolytic power and capacity for combining with antistreptolysins have been determined. The hemolytic strength may vary markedly, while under suitable conditions the combining power is constant. This stability of combining capacity makes it possible to prepare a large amount of streptolysin, standardize it against sera of known antistreptolysin s...

increasing the usage of electricity power illustrates its growing proportion and effective role in the energy economy. it also depicts the connection between using the electricity power and economic development. regarding the strategic role of power plants in the economic and social development, the absence of the environmental considerations in all phases, including site selection, planning, p...

in the past few decades, increasing growth of wind power plants causes different problems for the power quality in the grid. normal and transient impacts of these units on the power grid clearly indicate the need to improve the quality of the electricity generated by them in the design of such systems. improving the efficiency of the large-scale wind system is dependent on the control parameter...

Background and Objectives: In this paper, a new design strategy was proposed in order to enhance bandwidth and efficiency of power amplifier. Methods: To realize the introduced design strategy, a power amplifier was designed using TSMC CMOS 0.18um technology for operating in the Ka band, i.e. the frequency range of 26.5-40GHz. To design the power amplifier, first a power divider (PD) with a ver...

This paper describes the design, implementation and characterization of a high efficiency 10-GHz amplifier antenna array for spatial power combining. An average drain efficiency of 70% at 162 W EIRP, or about 1.5 W of transmitted power, is measured for an array of 16 amplifiers consisting of four 4-element subarays. The power combining efficiency of the 16-element array is above 79%. The active...