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Direct modulation characteristics of microdisk lasers with inGaAs/GaAs quantum well-dots

Photonics Research 2019年第6期7卷 664-668页

作者： N.V.KRYZHANOVSKAYA E.i.MOiSEEV f.i.zubov A.M.MOZHAROV M.V.MAXiMOV N.A.KALYUZHNYY S.A.MiNTAiROV M.M.KULAGiNA S.A.BLOKHiN K.E.KUDRYAVTSEV A.N.YABLONSKiY S.V.MOROZOV YU.BERDNiKOV S.ROUViMOV A.E.ZHUKOV St.Petersburg Academic University Khlopina 8/3 S t Petersburg 194021 Russia ioffe institute of RAS Politehnicheskaya 26 St. Petersburg 194021 Russia institute for Physics of Microstuctures of RAS Nizhny Novgorod 603950 Russia iTMO University Kronverkskiy prospekt 49 St. Petersburg 197101 Russia University of Notre Dame Notre Dame Indiana 46556 USA

GaAs-based microdisk lasers with an active region representing a dense array of indium-rich islands(inGaAs quantum well-dots) were studied using direct small-signal modulation. We demonstrate that using dense arrays of inGaAs quantum well-dots enables uncooled high-frequency applications with a GHz-range bandwidth for microdisk lasers. A maximum 3 dB modulation frequency of 5.9 GHz was found in the microdisk with a radius of 13.5 μm operating without a heatsink for cooling. A modulation current efficiency factor of 1.5 GHz∕mA1∕2 was estimated.

关键词： Direct modulation characteristics quantum well-dots

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Seasonal Variation in Krasnodar Greenbug Population for Virulence to Sorghum Genotypes

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Journal of Life Sciences 2011年第4期5卷 271-278页

作者： Eugene Radchenko Anton zubov Department of Genetics Vavilov Institute of Plant Industry St.-Petersburg 196600 Russia

intraspecific variability in Schizaphis graminum （Rondani） was studied in 2002-2005. Aphid clones were sampled from sorghum field at the Kuban Experimental Station （Krasnodar region, Northern Caucasus, Russia） in June （active greenbug migration to the field）, July （high rate of the population increasing）, and August （greenbug abundance decreasing） and at the end of September or in the beginning of October （appearance of sexual males and females）. Damage rating was estimated for two plant sets composed of three sorghum differentials. Set A contains Deer （gene for resistance Sgr4）, Sarvasi （Sgrl ＋ Sgr2） and Capbam （Sgrl2）. Set B contains Shallu （Sgr3）, Sorgogradskoe （Sgr5） and Durra Belaya （Sgr5 ＋ Sgr6）. To estimate variability in greenbug subpopulations criteria proposed by Zhivotovsky （1982） were used. frequencies of greenbug clones with virulence to sorghum accessions essentially differed. Very high overall and seasonal polymorphism of the insect for virulence was revealed. Among 517 aphid clones tested 33 phenotypes for virulence were identified. The aphid subpopulations collected from the same field at different periods of sorghum vegetation varied significantly in share of rare phenotypes. Criteria of similarities varied from 0.268 to 0.739; according to criterion of identity significant differences between 44 summer subpopulations from 66 studied were found.

关键词： Sorghum genotype greenbug virulence seasonal variation.

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