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고출력 이중통과 erbium-doped 광섬유 레이저의 구현에 관한 연구
김광년,백운식 慶熙大學校 레이저 工學硏究所 2003 레이저공학 Vol.14 No.-
High power single wavelength laser which has variable wavelengths of up to 50nm was demonstrated in an Keerbium-doped fiber laser using a double-pass configuration. We injected the forward ASE into EDF again for the gain improvement. The double-pass configuration laser has more than 11dBm output power and less than 0.13nm linewidth.
김찬미,이영식 慶熙大學校 레이저 工學硏究所 1997 레이저공학 Vol.8 No.-
Laser pump-probe technique is a very important tool for chemical reaction dynamics research. In this article, the details of LIF spectroscopy using one YAG laser are presented. The 4th harmonic of TAG fundamental beam was used as a photolysis light while the 2nd harmonic beam was used for dye laser pumping. In a trial run, OH sample produced a unique OH LIF spectrum. From the result, we conclude that the constructed apparatus works correctly for LIF spectroscopy.
이응제,이희철,김용평 慶熙大學校 레이저 工學硏究所 2003 레이저공학 Vol.14 No.-
We suggest the optimal conditions for fabricating solid state dye and analysed its lasing characteristics. It is measured and analysed the output characteristics of solid state dye laser in various conditions such as pumping repeatition rate, input energy, molar concentration, and the length of dyecell, etc. The conversion efficiency of 40 % was obtained in this lasing material.
Nd:YAG 레이저 여기 광섬유 라만 레이저의 다파장 발생
황인덕,이주희 慶熙大學校 레이저 工學硏究所 1996 레이저공학 Vol.7 No.-
In this paper, we have developed the single pass tunable fiber Raman laser pumped by Q-switched Nd:YAG laser in multimode silica fiber for the generation of near- IR wavelengths which can effectively be used in optical communication, remote sensing, medical applications and performance measurements of singlemode or multimode fibers. Also we have investigated the output characteristics of fibr Raman laser as a function of input pump energy at the fixed fiber length of 40 m. The output components were dispersed by a prism and grating (600g/mm) and displayed on the infrared detection card. As a result many distict Stockes orders were seen at higher pump powers.
이주희,이관희,이용우,황인덕 慶熙大學校 레이저 工學硏究所 1995 레이저공학 Vol.6 No.-
In this paper, we have developed the tunable dye laser system pumped by N₂ laser(1mJ, 6ns, 1Hz) and investigated the output characteristics as a function of the dye(Rhodamine-6G) concentration in the master-oscillator and the first amplifier, respectively. In particular, we have studied continuous tunability of output spectrum using two prism as the tuning element.
XeCl/KrF 레이저 여기 스톡스 라만 레이저의 출력 특성
황인덕,이주희 慶熙大學校 레이저 工學硏究所 1993 레이저공학 Vol.4 No.-
In this paper, We have investigated the output characteristics of the Stokes Raman laser in hydrogen and deuterium gas as a function of the incident pump energy and gas pressure of Raman medium using the XeCl and KrF excimer lasers as pumping source for generating the differential absorption lidar(DLAL) wavelengths suitable in measuring the ozone concentration of stratosphere and troposphere. The confocal unstable optical cavity in the positive branch is used to improve the spatial uniformity of the pump beam.
Nd:YAG 레이저 여기 H₂/CH₄ 라만 레이저의 출력 특성
전성률,이주희,황인덕 慶熙大學校 레이저工學硏究所 1997 레이저공학 Vol.8 No.-
In this paper,we have developed H₂/CH₄ Raman laser pumped by Q-switched Nd:YAG laser for monitoring Water vapor or Aerosol in the atmosphere. Also we have investigated the output characteristics of H₂, CH₄ and mixed H₂/CH₄ Raman laser as functions of gas pressure and input pump energy, respectively.
국내 자동차 산업에서의 고객만족지수 개발과 활용 방안에 관한 연구
정지영,조재립 慶熙大學校 레이저 工學硏究所 2003 레이저공학 Vol.14 No.-
Customer Satisfaction Index (CSI), which customers themselves assess, is one of the most efficient ways to identify and evaluate whether a company is well managed. ACSI. KCSI and NCSI indices became a universal standard for measuring management outcome. In the mean time, these indices could not be applied to every single industry because they simply do not take into account all the typical characteristics of each different industry. In light of this, this study has focused on developing an effective model that is based on SEM already proved reliable and that could be applied to the domestic car manufacturing industry in particular. In order to increase accuracy, Human Sensibility Ergonomics technique is applied to the selection of key figures of the measurement. In addition, AHP Model, which is one of efficient decision-making methods, is factored in to help customers make a better and easier estimation.
동심원통형 레이저챔버를 가지는 1.6kHz 엑시머 레이저의 특성
이주희,박홍진 慶熙大學校 레이저 工學硏究所 1999 레이저공학 Vol.10 No.-
We developed the laser chamber with coaxial cylindrical form suitable for kHz class comfact size excimer laser with high repetion rate and We analyze the gas streamlined from in the laser chamber by phoenics program. The coaxial cylindrical laser chamber is constructed by two coaxial cylinder, and filled up the laser gas between two cylinder then use this chamber as a streamlined gas channer. the gas channel is consist of only the main electrode and the one axial illegal channel fan to minimize the fluid resistance. like this, the volume of small size chamber is 10 1, the size of illegal channel fan is 34cm×9cm, the speed of a running fluid with 5000 rpm is 42m/s, the KrF's average output power with 1.6kHz repetition rate is 52 watt, the total efficiency is 1.2%, and the output index is 5 watt/liter.
Nd: YAG펄스레이저 펌핑 다중모드 시리카 광섬유의 스톡스 라만레이저 해석
김기영,이주희,황인덕 慶熙大學校 레이저 工學硏究所 1998 레이저공학 Vol.9 No.-
. In this paper, we have nuumerically studied the evolution of Stokes spectrum and temporal profiles by stimulated Raman scattering. 1064 nm Nd:YAG laser with pulse width of 29 nsec(FWHM) is used as pumping sourse. The used optical fiber is a step-index multimode silica fiber with the core diameter of 50 μm, NA of 0.2, loss of 1dB/km at 1064 nm. We have investigated the stimulated Stokes spectrum and temporal profiles on the shape of the Roman gain curve, input pump power, fiber length, and temporal width of input pump, respectively. By these simulation results, we have shown that stimulated Raman spectra consists of a series of cascaded Stokes orders separated by frequency shifts of 440 cm corresponding to the peak of the broad Raman gain band. We have confirmed that the short pulse duration less than pump pulse in stimulated Raman temporal profile is generated in the high-order Stokes components.