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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->专题:脉冲功率激光]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research progress of supercontinuum laser source]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Along with the maturity of high-nonlinearity optical fiber manufacturing technology and the improvement of the performance of fiber lasers, the supercontinuum sources have entered a period of rapid development. Supercontinuum generation by using optical fibers as the non-linear media has become a research hotspot. The technical schemes and recent progress of supercontinuum generation were been reviewed from three different bands:visible, near-infrared and mid-infrared. At present, the output power of the visible and near-infrared supercontinuum sources broke through 100 W. At the same time, many new schemes such as supercontinuum generation in multi-core photonic crystal fibers, fiber amplifiers and random fiber lasers were developed. The output power of mid-infrared supercontinuum generation by using fluoride and tellurite fibers as non-linear media, also reached 10 W. The output spectrum of supercontinuum generation with chalcogenide optical fibers as non-linear medium was extended to more than 12 μm.]]></description>
<pubDate>2020/1/19 0:00:00</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[YANG Weiqiang, SONG Rui, HAN Kai, HOU Jing]]></author>
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<atom:name>YANG Weiqiang, SONG Rui, HAN Kai, HOU Jing</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Distributions of the electron in the interactions between high power microwave and plasma]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As an important physical parameter, the electron number density is usually used to analyze the change process of the interaction between high power microwave and plasma. The change characteristics of electrons in plasma was studied by combining the wave equation, the electron transport equation and the heavy species transport equation by using the fluid approximate method, and the average electron number density and electron energy in the plasma region were calculated with the help of the software COMSOL. Result shows that the electron avalanche effect in the plasma appears as HPM(high power microwave) propagates inside the plasma, the electron numerical density increases rapidly, and the peak value shift towards the incident direction of HPM. In addition, it can be admitted that the electron energy increases with the HPM and decreases as the electron density increases.]]></description>
<pubDate>2020/1/19 17:05:06</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[LI Zhigang, CHEN Zongsheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Zhigang, CHEN Zongsheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001002]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Coupling effects of open-ended metal enclosure induced by powerful electromagnetic pulse]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to investigate the influence of an opening in a metal cavity on the destruction efficiency of HEMP (high-amplitude electromagnetic pulse) and HPM (high power microwave), the model of electromagnetic pulse coupling into an open-ended metal enclosure was built with the help of CST software. Based on the model, the influences of the location, size and length-to-width ratio of the aperture on coupling effects of HEMP and HPM were researched. As for HEMP, the location, size and length-to-width ratio of the aperture can exert great influence on the coupling effect, so the destruction efficiency of HEMP can be weakened by reasonable controls of these factors. As for HPM, its coupling effect is obviously stronger than that of HEMP under the same conditions. After the aperture reaches a certain size, its size and length-to-width ratio have few influences on the coupling effect of HPM, and only the location of the aperture has a great influence. The coupling effect is the weakest when the plane of the opening is in parallel with the incident direction of HPM, but the energy coupled into the cavity can easily reach the electromagnetic damage level of many electronic components.]]></description>
<pubDate>2020/1/19 17:05:07</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[CHEN Zongsheng, LI Zhigang]]></author>
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<atom:name>CHEN Zongsheng, LI Zhigang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001003]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Laser dazzling effect assessment based on local features and image quality in target region]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A laser dazzling effect assessment of optoelectronic systems based on local features and image quality in the target region was proposed. The feature points were used to describe the local feature of the image. The structural similarity index was computed to reveal the image quality. The assessment utilized the point feature matching algorithm to locate the target region in the scene image. Then the ratio of the number of feature points and the unsaturated area and also the structure similarity index in the target region between the original image and dazzled image were computed. The final assessment index was achieved by the product of these three factors above. The implementation of the assessment to a typical dazzled image suggested that this assessment can provide a more broad range of index value and more obvious nonlinear variation than that obtained by only the structural similarity index in the target region, which indicated that this assessment method suggested in this paper has the ability to show more detail of laser dazzling process and more suitable for the assessment to lase-dazzling effect to image system.]]></description>
<pubDate>2020/1/19 17:05:07</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[SUN Ke, YE Qing, SUN Xiaoquan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SUN Ke, YE Qing, SUN Xiaoquan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001004]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of phase fluctuation by atmospheric turbulence on phase estimation of coherent state quantum radar]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The Mach-Zehnder interferometer and phase-diffusion main equation were used to simulate the influence of atmospheric phase fluctuation on the quantum radar, and the evolution process under phase diffusion channel was solved. The influence of atmospheric phase fluctuation on the phase estimation resolution and optimal sensitivity of the coherent state parity probe quantum radar were thoroughly analyzed, and the Cramer-Rao limit of phase estimation sensitivity under atmospheric phase fluctuation was calculated. The study found that the effect of phase fluctuation on resolution can be eliminated by increasing the average number of photons per pulse. Moreover, in the case of strong phase fluctuation, the best sensitivity of parity detection may seriously deviate from the shot noise limit, but in the case of weak phase fluctuation, it is found that the parity detection is a quasi-optimal detection compared with the Cramer-Rao limit.]]></description>
<pubDate>2020/1/19 17:05:07</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[TAO Zhiwei, WANG Shu, REN Yichong, RAO Ruizhong]]></author>
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<atom:name>TAO Zhiwei, WANG Shu, REN Yichong, RAO Ruizhong</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001005]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on fault diagnosis of pulse power supply]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Pulsed power supply is the most vulnerable part of the electromagnetic launch system, and the failure of the pulsed power supply will make the whole system performance decline. Thus, in view of the pulse power supply failure, a model search support vector machine fault diagnosis method based on multi-layer wavelet analysis for fault information extraction was proposed. By establishing the soft fault model of pulse power supply, the current fault data samples were obtained through simulation analysis, and the discrete wavelet decomposition of the fault samples was carried out, then the wavelet coefficients of the specified layer details were obtained as the fault feature quantities. The principal component analysis of the fault feature was carried out, and the dimension of wavelet coefficients was reduced, so that the fault diagnosis was effectively carried out. Through the experiment, the proposed fault diagnosis method was compared with the other three kinds of fault diagnosis results, and the effectiveness of the method was verified.]]></description>
<pubDate>2020/1/19 17:05:07</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[XIONG Shicheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XIONG Shicheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001006]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Impact of temperature on degradations of laser diode]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202001007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The impact of temperature on laser diode degradations were studied by equivalent circuit model simulation and accelerated degradation experiment. Two degradation modes of laser diode were analyzed and concluded that the active region degradation will cause the threshold current to increase, and the cavity surface degradation will cause the slope efficiency to decrease. The thermal characteristics of laser diode were modeled and simulated, and were concluded that the threshold current increases with the temperature rise. The accelerated degradation experiments were carried out by a laser diode accelerated degradation experiment platform. The results of simulation and experiment showed that the increase of temperature will aggravate the cavity surface degradation, but has no significant effect on the active region degradation of laser diode. These conclusions will improve the laser diode temperature degradation simulation modelling. The current study is beneficial for the mechanism of temperature on laser diode degradation and protective measures.]]></description>
<pubDate>2020/1/19 17:05:07</pubDate>
<category><![CDATA[专题:脉冲功率激光]]></category>
<author><![CDATA[YANG Peng, HU Yerong, WANG Guishan]]></author>
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<atom:name>YANG Peng, HU Yerong, WANG Guishan</atom:name>
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