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Hetero-integrated high-peak-optical-power laser source(940 nm) for time-of-flight sensors

Chinese Optics Letters 2024年第7期22卷 86-90页

作者： Sergey Olegovich Slipchenko aleksandr aleksandrovich podoskin Ilia vasil'evich Shushkanov Marina Gennad'evna rastegaeva Artem Eduardovich rizaev Matvey Igorevich Kondratov Artem evgen'evich Grishin nikita aleksandrovich pikhtin Timur Anatol'evich Bagaev Maxim Anatol'evich Ladugin aleksandr Anatol'evich Marmalyuk vladimir aleksandrovich Simakov Ioffe Institut Russian Academy of Sciences rUDn University Open Joint-Stock Company M.F.Stel'makh polyus research Institute

The generation of high-power laser pulses using a compact hetero-integrated assembly based on a semiconductor laser with a dual-element composite 2 μm × 100 μm aperture and a compact heterothyristor switch is demonstrated. The achieved peak optical power was 33 W with a pulse duration of 3 ns at a thyristor operating voltage of 55 v. The leading edge of the laser pulse turn-on was 50 ps to a power level of 24.7 W, and the turn-on delay between the elements of the composite aperture was 160 ps.

关键词： Diode lasers High power lasers Laser arrays Laser sources Semiconductor lasers vertical cavity surface emitting lasers

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Exploring the impact of soil water variability and varietal diversity on alfalfa yield,nutritional quality,and farm profitability

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Grassland research 2023年第4期2卷 266-278页

作者： rudra Baral S.v.Krishna Jagadish nathan Hein romulo p.Lollato aleksan Shanoyan Anil K.Giri Jiyung Kim Myungkyo Kim Doohong Min University of Missouri Extension ColumbiaMissouriUSA Deartment of plant and Soil Science Texas Tech UniversityLubbockTexasUSA Department of Agronomy Kansas State UniversityManhattanKansasUSA Department of Agricultural Economics Kansas State UniversityManhattanKansasUSA Economic research Service United States Department of AgricultureKansas CityMissouriUSA School of Business Hanyang UniversitySeoulSouth Korea

Background:Despite high nutritional and economic value,alfalfa yield has not been improved in the United *** moisture critically influences alfalfa's yield and quality,affecting its physiological processes,nutrient uptake,and stand ***,the maturity stage at harvest can significantly impact both hay yield and ***,this study aimed to assess the effect of different soil moisture levels and harvesting times on forage yield,nutritive value,and the overall profitability of commercially cultivated ***:Two conventional and three lower-lignin alfalfa varieties were planted in a randomized complete block with split plot design under drought,rainfed,and irrigation conditions in 2020 in Manhattan,Kansas,*** dry matter yield(DMy)and forage nutritive value were evaluated at late bud,early flowering,and 7 days after early flowering stages,***:DMy varied with production year,soil water availability,and growth stages,with drought conditions causing a decline in DMy of 5%to 38%in the second production *** conditions and maturity stages influenced crude protein(Cp)and in vitro dry matter digestibility(IvDMD).Higher soil moisture and advancing maturity stages negatively impacted Cp,IvDMD,and relative forage *** study revealed net profit margins of 62%,64%,and 52%for drought-prone,rainfed,and irrigated production,***:Harvest timing and irrigation practices were found to have substantial implications for forage yield and nutritive value of *** yield-quality trade-off differed under drought and irrigation,with early harvesting leading to lower yields but higher protein content and *** study findings provide potential guidance for improving alfalfa hay yield,quality,and profitability.

关键词： crude protein drought dry matter yield forage nutritive value irrigation net farm income rainfed relative forage quality

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