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류한용,이주희,김용평 한국광학회 1994 한국광학회지 Vol.5 No.3
XeCl 엑시머 레이저를 횡방향의 전자빔으로 여기하여 이의 출력특성을 조사하였다. 전자빔의 출력은 880kV, 21kA(70ns, FWHM)이며 전자빔의 전류밀도는 다이오드(A-K) 간격과 공진기 외부에 설치한 펄스자계코일(4.7kG)로 제어하였다. 레이저 매질에 주입되는 전자빔의 축적에너지는 35J(4기압)이다. 축적에너지는 Radcolor film의 감광면적과 압력상승법에 의해 측정한 가스매질의 상승압력으로부터 환산된 수치이며, 이 때의 여기체적은 $320cm^{3}$이었다. 레이저 가스의 혼합비율은 HCl/Xe/Ar=0.2/6.3/93.5%이고 총압력이 3기압일 때, 최대효율 1.7%를 얻었다. 이 때의 출력에너지, 특성에너지는 각각 0.52J, 1.7J/l이었다. 실험결과의 분석을 위해 컴퓨터 시뮬레이션코드를 완성하였다. 시뮬레이션 결과는 실험결과와 잘 부합하고 있음을 확인하였고 그 결과를 이용하여 XeCl의 형성채널, 완화채널, 308nm의 흡수채널을 이론적으로 설명하였다. We have investigated output characteristics of XeCI excimer laser excited by transeverse electronbeam. We used e-beam output of 880 kV, 21 kA (70 ns, FWHM) and controlled current density of e-beam by pulsed magnetic coil (4.7 kG) which was fabricated around an e-beam diode (A-K gap is 21 mm) and laser chamber. We have obtained 35 J (4 atm) of e-beam deposition energy injected into laser media. The deposition energy was converted from an exposure area of Radcolor film and rising pressure of gas media which is measured by pressure jump method. The excited volume of $320cm^{3}$ was calculated. The maximum efficiency of 1.7% was obtained with the mixing ratio of HCllXe/Ar==0.2/ 6.3/93.5% and total pressure of 3 atm. Also laser output energy and specific energy were obtained 0.52 J and 1.7 J/I, respectively. For the analysis of experimental results we have developed computer simulation code. From the good agreements with the results of experiment and simulation we could theoretically explain the XeCI* formation channel. relaxation channel, and absorption channel of 308 nm.308 nm.
김용평,이주희,류한용 慶熙大學校 레이저 工學硏究所 1992 레이저공학 Vol.3 No.-
By developing a comprehensive computer modeling code, we have theoretically studied electron-beam-excited XeCl excimer laser. In this studied, we have analyzied XeCl?? formation channel, XeCl?? relaxation channel, and absorption channel at 308nm in upper laser level. It could be use of computer modeling which is constucted kinetic rate equation. Also we have invstigated intrinsic efficiency, photon extraction efficiency, formation efficiency of XeCl laser as a function of HCl halogen donor which intensively affects laser output.
전자빔여기 XeF(C→A) 엑시머 레이저의 출력특성에 대한 시뮬레이션 해석
류한용(Han-Yong Ryu),이주희(Choo Hie Lee) 한국광학회 1995 한국광학회지 Vol.6 No.3
전자빔여기 XeF(C→A) 엑시머 레이저의 상준위 B-와 C-상태에 대하여 충돌혼합 운동과정을 포함하는 모델을 컴퓨터 시뮬레이션하여 이의 출력특성을 해석하였다. XeF*(B)의 수밀도에 관련되는 XeF*(C)의 형성에 대하여 레이저 에너지를 실험치와 비교하였다. 이 결과는 70 ns [FWHM]의 전자빔 (800㎸, 21㎄)을 사용한 대기압 매질에서 매우 좋은 일치(28.5mJ±5%)를 보였고, Xe/F₂/Ar=5.26/0.46/94.28%의 최적화된 가스혼합비를 확인하였다. 또한 시뮬레이션으로 XeF*(C)의 형성경로, XeF*(C)의 완화경로, 청록색 파장대역의 흡수경로에 대한 F₂ 할로겐 도우너 및 Xe 압력의 함수관계를 조사하였다. By the use of computer simulation including collisional mixing kinetic processes of the B- and C-state in the upper laser level the output characteristics of electron-beam pumped XeF(C→A) excimer laser are analyzed. We compared the results between experiments and simulations for the XeF*(C) formation that correlated the number of densities of the XeF*(B). We obtained good agreement(28.5 mJ ± 5%) with comparisons between experiment and simulation and confirmed the optimal gas mixing ratio of Xe/F₂/Ar=5.26/0.46/94.28% at atmospheric pressure laser medium under the condition of 70 ns [FWHM] electron-beam (800 ㎸, 21 ㎄). Also through the simulation we have investigated that the XeF*(C) formation channel, the XeF*(C) relaxation channel, and the absorption channel of blue-green wavelength region as a function of F₂ halogen donor and Xe partial pressure.
넓은 범위의 압력에서 Xe 농도 변화에 대한 XeF(C→A) 레이저의 출력특성
류한용(Han-Yong Ryu),이주희(Choo Hie Lee) 한국광학회 1995 한국광학회지 Vol.6 No.3
레이저매질의 넓은 압력범위(0.5~3.5 기압)에 대한 70 ns [FWHM]의 전자빔 가속기(800 ㎸, 21 ㎄)로 여기할 때 free-running XeF(C→A) 엑시머 레이저의 출력과 Xe 농도와의 상호관계를 조사하였다. 공진기를 쌍색성의 출력거울로 구성하고, 레이저 출력을 레이저매질(Xe/F₂/Ar)의 총압력과 가스혼합비의 함수로써 최적화 하였다. F₂ 0.46%를 고정한 조건에서, 레이저 고유효율은 총압력 1, 2, 3 기압에서 최대 0.38%, 1.03%, 0.29%로 측정되었다. 이때 레이저의 최대 고유효율은 레이저매질의 총압력이 낮을수록 높은 Xe 농도에서 높게 나타났다. 이같은 상호관계를 XeF*(C)의 형성효율 및 XeF(C→A) 레이저 추출 효율에 대해 동력학적으로 해석하므로써 Xe 농도의 의존성을 설명하였다. 그 결과로 대기압 XeF(C→A) 레이저의 효율적인 동작을 제안한다. When the broad pressure region (0.5~3.5 atm) of laser media is pumped by 70 ns [FWHM] electron-beam accelerator (800 ㎸, 21 ㎄), the correlation between free-runnuing XeF(C→A) excimer laser out-put and Xe concentration are studied. The resonator consisted of dichroic output coupler, and the laser output is optimized with laser media (Xe/F₂/Ar) as functions of total pressure and gas mixing ratio. Under the condition of F₂ 0.46% fixed, the laser intrinsic efficiencies of 0.38%, 1.03%, and 0.29% are obtained at 1, 2, and 3 atm, respectively. So then the peaks of laser intrinsic efficiency occured to the higher Xe concentration with decreasing total gas pressure. By analyzing the kinetics for the XeF*(C) formation efficiency and XeF(C→A) laser extraction efficiency the dependence of Xe concentration on their correlation is explained. As the results we propose efficient operation of an atmospheric-pressure XeF(C→A) laser.
전자빔 여기 청록색 XeF(C→A) 엑시머 레이저 출력 특성
류한용,이주희 慶熙大學校 레이저 工學硏究所 1993 레이저공학 Vol.4 No.-
We obtained the XeF excimer laser energies of 7.8mJ(2.5 atm) and 128mJ(3.5 atm) at the regions of C→A and B→X transition, respectively which had been pumped by electron-beam with 800 kV and 21 kA(70ns, FWHM). In use of Xe, F₂, and Ar gases we found optimized gas mixing ratio and total gas pressure and measured XeF(C→A) laser peak intensity at 478.86nm.
전자빔 여기 XeF(C→A)레이저의 출력에 대한 Xe 농도 의존성
류한용,이주희 慶熙大學校 레이저 工學硏究所 1995 레이저공학 Vol.6 No.-
Characteristics of the XeF(C →A) excimer laser has been investigated through both experiment and theoretical analysis. The 70 ns [FWHM] of e-beam (800 kV, 21 kA) could excited Ar gas of 1 atm at the excitation rate of 1 MW/㎤ under the magnetic flux density of 4.7kG. The XeF laser system with a dichroic output coupler was optimized by adjusting the total pressure and mixing ratio of the laser media. The optimal mixing ratio was Xe/F₂/Ar=5.26/0.46/94.28% and the maximum energy of the laser pulse was measured about 100 mJ and 30 mJ at the total pressure of 2 atm and 1 atm, respectively. The atmospheric-pressure XeF(C →A) laser showed a higher intrinsic efficiency with higher Xe concentration when the total pressure of the laser media was less than 1 atmosphere. This result was also confirmed by the simulation based on gas kinetics as functions of XeF*(C) formation efficiency and extraction efficiency of XeF(C →A) laser.
양종원,신진우,류한용,허훈,이우상,김창구,남상훈,소준호,Yang, Jong-Won,Shin, Jin-Woo,Ryu, Han-Young,Heo, Hoon,Lee, Woo-Sang,Kim, Chang-Gu,Nam, Sang Hoon,So, Joon-Ho 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.5
In this paper, we have proposed high power generator with Induction Voltage Adder of three cells. IVA which has n cells can generate n-th times high power pulse, is a more stable system than Marx generator in the view of breakdown. We applied amorphous metal magnetic cores as an energy storing material for IVA rather than ferrite cores because of their higher magnetic flux swing to make it more compact system and the loss of it was also considered in the design. For driving the IVA, we design Blumlein pulse generators which are filled with pure water for high dielectric constant and high breakdown field strength, and triggered by single Marx generator. We have presented the PSPICE simulation and its test result.