High Power Crossed-Field Amplifier for Material Processing

1994 ◽  
Vol 347 ◽  
Author(s):  
M. S. Worthington ◽  
Guilford R. MacPhail
Keyword(s):  
Material Processing ◽  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
Average Power ◽  
Microwave Energy ◽  
Operating Characteristics ◽  
Industrial Processing ◽  
Long Life

AbstractThe use of microwave energy for industrial processing applications has been ongoing since the early 1950's. A number of high power tubes were developed in the mid-1960's at 805, 915 and 2,450 MHz for industrial uses. One super power crossed-field amplifier (CFA), the QKS1262, was available in either 50 or 100 kW continuous wave (CW) format. This CFA was designed with a platinum emitter which was pulse started with 100 W average power. The CFA operates at ∼20 kV at 5 amps (50 kW - CW output) or 10 amps (100 kW - CW output/65% efficiency).This paper will describe the operating characteristics of the QKS1262 and the options in design to attain high power with high efficiency and long life (25,000 hours).

Wideband, high-efficiency, high-power GaN amplifiers, using MIC and quasi-MMIC technologies, in the 1–4 GHz range

2014 ◽  
Vol 7 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Chamssedine Berrached ◽  
Diane Bouw ◽  
Marc Camiade ◽  
Kassem El-Akhdar ◽  
Denis Barataud ◽  
...  
Keyword(s):  
Output Power ◽  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
Power Gain ◽  
Frequency Range ◽  
Final Size ◽  
Trade Off ◽  
Power Added Efficiency ◽  
Circuit Technology

In this paper, the designs and experimental performances of wideband (higher than one octave) high-efficiency, high-power amplifiers (HPA) working in the 1–4 GHz range, using the same GaN process, are presented. They are based on the Bode–Fano integrals, which can be applied to a trade-off calculation between bandwidth and efficiency. Firstly, an microwave intregrated circuits (MIC) wideband HPA, externally matched, is presented. It generates a continuous wave (CW) output power (Pout) greater than 40 W, a power gain (GP) higher than 9.2 dB and a corresponding power added efficiency (PAE) (drain efficiency (DE)) ranged between 36 and 44% (40 and 48%) over the 1–3 GHz bandwidth. Two other amplifiers have been designed upon the same theoretical methodology, with a passive GaAs MMIC circuit technology, enabling to reduce the final size down to 420 mm2. The first internally matched Quasi monolithic microwave intergrated circuits (Quasi-MMIC) single-ended HPA generates a pulsed Pout greater than 25 W, GP higher than 9.8 dB, and a corresponding PAE (DE) ranged between 37 and 52.5% (40 and 55%) over the 2–4 GHz bandwidth. The second internally matched Quasi-MMIC HPA, based on balanced architecture, generates a pulsed Pout higher than 45 W, GP higher than 9.5 dB and PAE (DE) ranged between 33 and 44% (38 and 50%) over the 2–4 GHz bandwidth. These results are among the best ones published in terms of PAE and Pout in instantaneous octave bandwidth in the 1–4 GHz frequency range.

High power, high efficiency continuous-wave 808 nm laser diode arrays

2017 ◽  
Vol 97 ◽  
pp. 297-301 ◽  
Author(s):  
Zhenfu Wang ◽  
Te Li ◽  
Guowen Yang ◽  
Yunfei Song
Keyword(s):  
Laser Diode ◽  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
Laser Diode Arrays

High-efficiency, high-power, diode-pumped continuous-wave Tm:YAlO3 slab lasers

2009 ◽  
Vol 97 (3) ◽  
pp. 639-643 ◽  
Author(s):  
X. Cheng ◽  
F. Chen ◽  
G. Zhao ◽  
J. Xu
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
Diode Pumped ◽  
Power Diode ◽  
Slab Lasers

scholarly journals New High-Efficiency Resonant O-Type Devices as the Promising Sources of Microwave Power

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2514
Author(s):  
Andrei Baikov ◽  
Olga Baikova
Keyword(s):  
Radio Frequency ◽  
High Power ◽  
Microwave Power ◽  
High Efficiency ◽  
Microwave Energy ◽  
Input Circuit ◽  
Rf Power ◽  
Energy Regeneration ◽  
Microwave Sources ◽  
Effective Source

New O-type high-power vacuum resonant microwave devices are considered in this study: COM klystrons, CSM klystrons and resotrodes. All these devices can output a large amount of power (up to units of MW and higher) with an efficiency of up to 90%. Such devices are promising microwave sources for industrial microwave technologies as well as for microwave energy. The principle of GSP-equivalence for klystrons is described herein, allowing a complete physical analog of this device with other parameters to be created. The existing mathematical and computer models of klystrons are analyzed. The processes of stage-by-stage optimization and the embedding procedure, which leads to COM and to CSM klystrons, are considered. Resotrodes, IOT-type devices with energy regeneration in the input circuit, are also considered. It is shown that these devices can combine high power with an efficiency of up to 90% and a gain of more than 30 dB. Resotrodes with 0-regeneration can be effective sources of radio frequency (RF) power in the range of 20 to 200 MHz. Resotrodes with 2π-regeneration are an effective source of RF/microwave energy in the range of 200 MHz to 1000 MHz.

High efficiency and high power continuous-wave semiconductor terahertz lasers at ∼3.1THz

2013 ◽  
Vol 81 ◽  
pp. 68-71 ◽  
Author(s):  
Junqi Liu ◽  
Jianyan Chen ◽  
Tao Wang ◽  
Yanfang Li ◽  
Fengqi Liu ◽  
...  
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
Terahertz Lasers

Development of a High-Power Continuous-Wave Gyrotron for High-Efficiency Technological K-Band Microwave Complexes

2019 ◽  
Vol 62 (7-8) ◽  
pp. 506-512
Author(s):  
M. D. Proyavin ◽  
M. Yu. Glyavin ◽  
N. A. Zavol’sky ◽  
V.N. Manuilov ◽  
M.V. Morozkin ◽  
...  
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Continuous Wave ◽  
K Band

scholarly journals High power ytterbium-doped fiber lasers — fundamentals and applications

2014 ◽  
Vol 28 (12) ◽  
pp. 1442009 ◽  
Author(s):  
Michalis N. Zervas
Keyword(s):  
Material Processing ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Industrial Applications ◽  
Optical Damage ◽  
Fiber Nonlinearities ◽  
Fundamental Properties ◽  
Power Evolution

In this paper, we summarize the fundamental properties and review the latest developments in high power ytterbium-doped fiber (YDF) lasers. The review is focused primarily on the main fiber laser configurations and the related cladding pumping issues. Special attention is placed on pump combination techniques and the parameters that affect the brightness enhancements observed in high power fiber lasers. The review also includes the major limitations imposed by fiber nonlinearities and other parasitic effects, such as optical damage, modal instabilities and photodarkening. The paper summarizes the power evolution in continuous-wave (CW) and pulsed YDF lasers and their impact on material processing and other industrial applications.

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