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| 1 | High absorption large-mode area step-index fiber for tandem-pumped high-brightnes shigh-power lasers显示文摘A short absorption length ytterbium(Yb)-doped large-mode area(LMA)fiber is presented as a step forward to mitigate the stern problem of nonlinear scatterings in a tandem pumping scheme adopted for high-power fiber laser.The short absorption length was realized by incorporating high Yb concentration in the fiber core.Furthermore,by replacing the inherent silica cladding with a Ge-doped cladding,we were able to obtain low core numerical aperture(NA)and negate the detrimental effect of index-raising by high Yb concentrations.This overcomes the long-standing limitation in step-index Yb-doped fibers(YDFs)where high cladding absorption inevitably results in high NA,thus hampering single-mode operation.We report an LMA(~575μm^2)YDF with NA of 0.04 and absorption of 27 dB/m at 976 nm both traits promote power scaling of single-mode tandem pumped fiber lasers.To our knowledge,this is the highest cladding absorption attained in a low-NA step-index fiber to date.An all-fiber tandem-pumped amplifier was built using only^14 m of the YDF.The amplifier delivered a near-Gaussian beam(M^i.27)at 836 W output power(pump power limited)with a high slope efficiency of^83%.Thanks to the short length and the tandem pumping,no indication of limiting factors such as stimulated Raman scattering,photodarkening,and transverse mode instability was observed. | KANG-JIE LIM SAMUEL KA-WEN SEAH JOASH YONG'EN YE WENDY WEIYING LIM CHU-PERNG SEAH YUNN-BOON TAN SUTING TAN HUITING LIM RAGHURAMAN SIDHARTHAN ARUMUGAM RAJENDRA PRASADH CHEN-JIAN CHAN SEONGWOO YOO SONG-LIANG CHUA | 2020 | Photonics Research2020，8，10： | 5 |
| 2 | Conceptual design of the Kumgang laser: a high-power coherent beam combination laser using SC-SBS-PCMs towards a Dream laser显示文摘In this review paper, we introduce a self-phase controlled stimulated Brillouin scattering phase conjugate mirror(SCSBS-PCM) and the Kumgang laser. The SC-SBS-PCM was proposed and demonstrated its success at the academic low power level, ~100 mJ@10 Hz. The Kumgang laser is under development to verify whether the SC-SBS-PCM is operable at the k W level. It is a 4 kW beam combination laser combining four 1 k W beams using the SC-SBS-PCM. If the Kumgang laser functions successfully, it will be the most important step towards a Dream laser, a hypothetical laser with unlimited power and a high repetition rate. | Hong Jin Kong Sangwoo Park Seongwoo Cha Heekyung Ahn Hwihyeong Lee Jungsuk Oh Bong Ju Lee Soungwoong Choi Jom Sool Kim | 2015 | High Power Laser Science and Engineering2015，3，1： | 5 |
| 3 | Selecting and applying quantification models for ecosystem services to forest ecosystems in South Korea显示文摘There is growing interest in using ecosystem services to aid development of management strategies that target sustainability and enhance ecosystem support to humans. Challenges remain in the search for methods and indicators that can quantify ecosystem services using metrics that are meaningful in light of their high priorities.We developed a framework to link ecosystems to human wellbeing based on a stepwise approach. We evaluated prospective models in terms of their capacity to quantify national ecosystem services of forests. The most applicable models were subsequently used to quantify ecosystem services. The Korea Forest Research Institute model satisfied all criteria in its first practical use. A total of 12 key ecosystem services were identified. For our case study, we quantified four ecosystem functions, viz. water storage capacity in forest soil for water storage service, reduced suspended sediment for water purification service, reduced soil erosion for landslide prevention service, and reduced sediment yield for sediment regulation service. Water storage capacity in forest soil was estimated at 2142 t/ha,and reduced suspended sediment was estimated at 608 kg/ha. Reduced soil erosion was estimated at 77 m^3/ha, and reduced sediment yield was estimated at 285 m^3/ha. These results were similar to those reported by previous studies.Mapped results revealed hotspots of ecosystem services around protected areas that were particularly rich in biodiversity. In addition, the proposed framework illustrated that quantification of ecosystem services could be supported by the spatial flow of ecosystem services. However,our approach did not address challenges faced when quantifying connections between ecosystem indicators and actual benefits of services described. | Hyun-Ah Choi Woo-Kyun Lee Cholho Song Nicklas Forsell Seongwoo Jeon Joon Soon Kim So Ra Kim | 2016 | Journal of Forestry Research2016，27，6： | 1 |
| 4 | An integrated model for the design of end-of-aisle order picking system and the determination of unit load sizes of AGVs显示文摘 | HARK H SEONGWOO M MITSUO G | 2002 | Computer & Industrial Engineering2002，42，24： | 1 |
| 5 | The Historical Review of Traditional Korean Fermented Foods显示文摘 | Seongwoo | 1988 | Korea Society of Food and Cooking Science1988，3，4： | 1 |
| 6 | 新型冰箱用往复式压缩机的可靠性设计(上)显示文摘1 前言
如今,在欧盟和美国,产品责任法规对制造商的产品设计要求更加严格.一些有少许设计缺陷的产品可能就会被召回,品牌价值也大打折扣. | Seongwoo Woo Dennisl o’Neal 金尧 李红旗 | 2007 | 家电科技2007，，8： | 1 |
| 7 | 新型冰箱用往复式压缩机的可靠性设计(下)显示文摘4 结果和讨论
4.1 加速寿命试验和失效分析的有效性
图4为现实中失效产品和经过加速寿命试验之后的产品.从照片中可以看到,两者在断裂的形状和部位上是一样的. | Seongwoo Woo Dennisl o' Neal 金尧 李红旗 | 2007 | 家电科技2007，，10： | 1 |
| 8 | A simple technique to enhance diversity order in wireless fading relay channels显示文摘 | Han Jaemin Oh Eunsung Ahn Seongwoo and Hong Daesik | 2008 | IEEE Communications Letter2008，12，3： | 1 |
| 9 | The effect of the rural tourism policy on non-farm income in South Korea显示文摘 | JaeHee Hwang SeongWoo Lee | 2015 | Tourism Management2015，46，2： | 1 |
| 10 | Erbium:ytterbium co-doped large-core fiber laser with 297W continuous-wave output power 显示文摘 | YOONCHAN J SEONGWOO Y CODERAARD C A | 2007 | Selected Topics in IEEE J Q E2007，13，3： | 1 |
| 11 | Soil erosion risk in Korean watershed, assessed using the revised univmsal soil loss equation 显示文摘 | Soyoung Park Cheyoung Oh Seongwoo Jeon | 2011 | Journal of Hydrology2011，399，： | 1 |
| 12 | Soil erosion risk in Korean watersheds, assessed using the revised universal soil loss equation显示文摘 | Soyoung P Cheyoung O Seongwoo J | 2011 | Journal of Hydrology2011，399，： | 1 |
| 13 | Polarizationcontroller using nematic liquid crystals 显示文摘 | Zhuang Zhizhong Suh SeongWoo Patel J S | 1999 | Optics Letters1999，24，10： | 1 |
| 14 | Spectral control of optical gain in a rare earth-doped optical fiber using novel triple layered structures显示文摘 | Seongwoo Yoo Uh-Chan Ryu | 2006 | Optical Fiber Technology2006，12，4： | 1 |
| 15 | Fabri- cation process and electromagnetic wave absorption char- acterization of a CNT/Ni/Epoxy nanocomposite 显示文摘 | Seongwoo Ryu Chan Bin Mo Haeshin Lee | 2013 | Journal of Nanoscience and Nanotechnology2013，13，： | 1 |
| 16 | Output characteristics of high-power stimulated Brillouin scattering pulse compression enhanced by thermal effects based on HT270显示文摘Thermal effects are typically considered as obstacles to high-repetition-rate stimulated Brillouin scattering(SBS)pulse compression.In this paper,a novel method is proposed for improving the SBS output characteristics by exploiting thermal effects on the liquid medium.Using HT270,the SBS output parameters with the medium purification and rotating off-centered lens methods are studied at different repetition rates.The results indicate that these two methods can alleviate thermal effects and improve the energy efficiency,but the rotating method reduces the energy stability because of the aggravated optical breakdown at the kilohertz-level repetition rate.For a 35-mJ pump energy,the energy efficiency at 2 kHz without the rotating method is 30%higher than that at 100 Hz and 70%higher than that at 500 Hz.The enhancement of the SBS output characteristics by thermal effects is demonstrated theoretically and experimentally,and 2-kHz high-power SBS pulsecompression is achieved with HT270. | Hongli Wang Seongwoo Cha Hong Jin Kong Yulei Wang Zhiwei Lv | 2022 | High Power Laser Science and Engineering2022，10，4： | 0 |
| 17 | Novel optical soliton molecules formed in a fiber laser with near-zero net cavity dispersion显示文摘Soliton molecules(SMs)are stable bound states between solitons.SMs in fiber lasers are intensively investigated and embody analogies with matter molecules.Recent experimental studies on SMs formed by bright solitons,including soliton-pair,soliton-triplet or even soliton-quartet molecules,are intensive.However,study on soliton-binding states between bright and dark solitons is limited.In this work,the formation of such novel SMs in a fber laser with near-zero group velocity dispersion(ZGVD)is reported.Physically,these SMs are formed because of the incoherent cross-phase modulation of light and constitute a new form of SMs that are conceptually analog to the multi-atom molecules in chemistry.Our research results could assist the understanding of the dynamics of large SM complexes.These findings may also motivate potential applications in large-capacity transmission and all-optical information storage. | Xiao Hu Jun Guo Jun Wang Jie Ma Luming Zhao Seongwoo Yoo Dingyuan Tang | 2023 | Light(Science & Applications)2023，12，2： | 0 |
| 18 | Heat Treatment of the Photonic Crystal Fiber显示文摘We report heat treatment of the photonic crystal fiber. As the temperature was increased, the transmission of the photonic crystal fiber was increased, unlike conventional single mode fiber. The transmission increase at short wavelength region was larger than long wavelength region for the various temperatures. After crystallization of the silica glass, the spectra of the photonic crystal fiber were just decreased at all wavelength regions, but, in case of the single mode fiber, the absorption in visibl... | Joo Beom Eom Seongwoo Yoo Jinchae Kim Hokyung Kim Un-Chul Paek Byeong Ha Lee | 2003 | 光学学报2003，23，S1： | 0 |
| 19 | Editorial: HPLSE special issue on fibres for high-power lasers显示文摘In 2018, the journal High Power Laser Science and Engineering produced a Special Issue on Fibres for High Power Lasers. Nowadays, fibre-based laser sources have found extensive applications both in industry and in scientific research. The scope of the special issue was to span the latest developments on the fast developing fibre-based high-power lasers and amplifiers. The topics invited for inclusion were: | Yingying Wang Seongwoo Yoo | 2018 | High Power Laser Science and Engineering2018，6，4： | 0 |
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