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Yea, Kwon-hae,Lee, Sangyeop,Choo, Jaebum,Oh, Chil-Hwan,Lee, Sanghoon Royal Society of Chemistry 2006 Chemical communications Vol.2006 No.14
<P>Fluorescence resonance energy transfer has been used to illustrate its applicability to the sensitive detection of DNA hybridization reactions in a PDMS microfluidic channel.</P> <P>Graphic Abstract</P><P>This research applies fluorescence resonance energy transfer (FRET) to detect DNA hybridization reactions in a PDMS microfluidic channel. This technique overcomes many of the drawbacks of microarray chips, such as the long hybridization time and inconvenient immobilization procedures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b516253j'> </P>
이성만,Duck-Hee Kwon,Hyungki Cha,Ji Young Lee,이기태,Kwon-hae Yea,Sungmo Nam,Sungok Kwon,Yong Joo Rhee,Yong Woo Lee,Yong-Ho Cha,Young Uk Jeong 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
Fast neutrons were generated from a deuterated polystyrene (C$_8$D$_8$) solid target by using an ultraintense Ti:sapphire laser with a 27-fs pulse width and a 260-mJ pulse energy. The dependency of neutron generation on the amplified spontaneous emission (ASE) width was analyzed in terms of the deuteron energy. At a shorter ASE width of 1 ns, neutron tracks of the 3533/pulse were obtained for a target thickness of 80 $\mu$m. In addition, the time-of-flight (TOF) neutron signal was analyzed in terms of the X-ray and the neutron signals.
Efficient Fast Neutron Generation in a Femtosecond, Deuterated, Polystyrene Plasma
이성만,Sangsoon Park,Kwon-Hae Yea,Duck-Hee Kwon,Park,YoungUk Jeong,Hyungki Cha 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
Fast neutrons were generated from a deuterated polystyrene (C8D8) solid target by using an ultraintense Ti:sapphire laser with a 27-fs pulse width and a 900-mJ pulse energy. The dependency of the neutron generation on the laser peak power was analyzed in terms of the deuteron energy. At a pulse energy of 900 mJ, a neutron yield of 4.4 × 106 neutrons/shot was obtained for a target thickness of 45 μm. The number of generated neutrons corresponds to an approximately 63 times increase in comparison to that obtained with a 260-mJ, 27-fs laser. Fast neutrons were generated from a deuterated polystyrene (C8D8) solid target by using an ultraintense Ti:sapphire laser with a 27-fs pulse width and a 900-mJ pulse energy. The dependency of the neutron generation on the laser peak power was analyzed in terms of the deuteron energy. At a pulse energy of 900 mJ, a neutron yield of 4.4 × 106 neutrons/shot was obtained for a target thickness of 45 μm. The number of generated neutrons corresponds to an approximately 63 times increase in comparison to that obtained with a 260-mJ, 27-fs laser.
Relationship between Terahertz and X-ray signals Generated from Laser-Induced Plasma on Gas Targets
문정호,Seong Hee Park,Kwon-hae Yea,Young Uk Jeong,이기태,Yong Woo Lee,Pil Dong Ahn,Yong Ho Cha,Byung Cheol Lee,Hyung-Ki Cha,Ji Young Lee 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
We have observed terahertz (THz) radiation, by using liquid-helium-cooled THz detectors, from gas targets irradiated by ultra-intense laser pulses of 30 fs and 200 ~300 mJ. The irradiating intensity of the Ti:Sapphire laser pulse was more than 1018 W/cm2. For a helium gas target, it is incident on the gas jet at 500 ~900 µm above the gas nozzle of 1 mm in diameter by using an off-axis parabolic (OAP) mirror with a f-number of 6.8. The relationships between the THz and the X-ray signals are different in the target materials. In a solid target, the aluminum (Al) target shows a linear dependency between them but no relationship is observed for the Mylar target in the case of linear mode conversion. This may be due to different mechanism of transport of hot electrons in the plasmas from conducting and dielectric materials. The relationships between THz and X-ray signals from the helium gas target was measured, analyzed, and compared with the results from the solid targets. The THz signals were measured from coherent transition radiation that could be generated when short electron bunches passed through a plasma-vacuum boundary. We also observed the dependence of THz signals on total charges of accelerated electrons by changing the electron plasma density. We adjusted the experimental conditions by changing both the backing pressure of the gas and the interaction position from the gas nozzle. In this paper, we discuss the relationship between THz signals, X-ray signals, and the yield of laser-accelerated electrons by analyzing electron charge measured using a Lanex film.
이지영,Young Uk Jeong,Jae Heung Jo,이기태,Kwon-hae Yea,Seong Hee Park,Yong Ho Cha,Yong Woo Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
Experiments on laser-induced charged particle generation are now well under way by using an ultrashot, intense Ti:sapphire laser developed at KAERI (Korea Atomic Energy Researc Institute). For the measurements of protons and light ions generated, TASTRAK (CR39) plastic of 0.75 mm in thickness, manufactured by Track Analysis Systems Ltd. at Bristol University, was used as a nuclear track detector. We investigated the dependence of track development on the energy of the laser-induced charged particles and the etching conditions. We use the measured bulk etching rate to present the optimal etching conditions for the experiments on laser-accelerated proton generation by using a 10-TW laser system.rga
Jungho Mun,Young Uk Jeong,Byung Cheol Lee,Hyuk Jin Cha,Ji Young Lee,Kitae Lee,Kwon-hae Yea,Pil Dong Ahn,Seong Hee Park,Yong Ho Cha,Yong Woo Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
Terahertz (THz) pulses from solid targets, such as an aluminum (Al) and a strong polyester film (Mylar), irradiated by ultra-intense laser pulses were measured by using a liquid-helium-cooled Ge:Ga detector. The irradiating intensity of the Ti:Sapphire laser was more than 10$^{18}$ W/cm$^2$. The typical pulse energy and pulse duration on the target were 200 mJ and 30 fs, respectively. To prevent ultraviolet (UV), visible, and near-infrared (NIR) radiation from being measured by the detector, we used polyethylene (PE) plates and indium-tin-oxide (ITO) films as selective windows and mirrors for the THz radiation. The reflectivity of the ITO film for THz radiation is 10 times higher than that for visible and NIR radiations. The THz wave radiated from a laser-induced plasma has a linear component of the polarization, which may be explained by linear mode conversion from a laser wakefield. This intense and wide-band radiation is expected to be a useful source for various THz applications, as well as for real-time diagnostics for a plasma in which particles are accelerating.
Deuterium Clusters Fusion Induced by the Intense Femtosecond Laser Pulse
Hong-Jie, Liu,Zhi-Jian, Zheng,Yu-Qiu, Gu,Bao-Han, Zhang,Yong-Joo, Rhee,Sung-Mo, Nam,Jae-Min, Han,Yong-Woo, Rhee,Kwon-Hae, Yea,Jia-Bin, Chen,Hong-Bin, Wang,Chun-Ye, Jiao,Ying-Ling, He,Tian-Shu, Wen,Xia ALLERTON PRESS INC 2007 CHINESE PHYSICS LETTERS Vol.24 No.2
<P>Neutrons (2.45 MeV) from deuterium cluster fusion induced by the intense femtosecond (30 fs) laser pulse are experimentally demonstrated. The average neutron yield 10<SUP>3</SUP> per shot is obtained. It is found that the yield slightly increases with the increasing laser spot size. No neutron can be observed when the laser intensity I < 4.3×10<SUP>15</SUP> W/cm<SUP>2</SUP>.</P>