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Nd:YAG 레이저의 제 2조화파로 종여기하는 펄스형 Ti:sapphire 레이저 발진기와 이를 이용한 단일경로 형태의 Ti:sapphire 증폭기의 출력특성
김경남,조재흥,임권,차병헌,Kim, Kyung-Nam,Jo, Jae-Heung,Lim, Gwon,Cha, Byung-Heon 한국광학회 2007 한국광학회지 Vol.18 No.1
레이저 분광용 고출력 파장가변 레이저로 이용할 Nd:YAG 레이저의 제 2조화파로 종여기한 평행평면형 공진기 구조의 펄스형 Ti:sapphire 레이저 발진기와 이를 이용한 단일경로 형태의 Ti:sapphire 레이저 증폭기의 출력특성을 조사하였다. 발진기의 경우에는 여기광의 에너지, 공진기 길이, 출력거울의 반사율을 변화시키면서 출력스펙트럼, 펄스 발생시간, 펄스폭, 출력에너지를 측정하였다. 그리고 증폭기의 경우, 발진기의 레이저 광과 증폭기 여기광이 증폭매질에 들어오는 시간차이, 그리고 발진기의 여기에너지와 증폭기의 여기에너지를 각각 변화시키면서 증폭기의 출력에너지를 측정하고 이를 분석하였다. 이 결과 발진기와 증폭기의 여기에너지가 18 mJ/pulse일 때 두 여기광의 시간차가 35 ns까지는 지속적으로 증폭기의 에너지가 증가했으며, 발진기의 여기광에 대한 증폭기의 기울기 효율은 23.5 %이고, 증폭기의 여기광에 대한 증폭기의 기울기 효율은 11.6 %였다. The various output characteristics of a pulsed Ti:sapphire laser oscillator with a plane-parallel resonator, pumped longitudinally by the second harmonic wave of a Nd:YAG laser, and the output of a Ti:sapphire laser amplifier operated along the single path of the oscillator beam were investigated and analyzed. In the case of the oscillator, we measured the spectrum, the pulse buildup time, the temporal duration time of the pulse, and the output energy according to the variation of the pumping energy, resonator length, and the reflectance of the output coupler. And, in the case of the amplifier, we investigated and analyzed the output energy of the amplifier as a function of the time difference between the two pump beams of the oscillator and the amplifier, the pumping energy of the oscillator, and the pumping energy of the amplifier When pump energies of both the oscillator and the amplifier were 18 mJ/pulse, we could find that the output energy of the amplifier increased linearly and gradually up to the time difference of 35 ns. Finally, we determined that the slope efficiencies of the oscillator and the amplifier were 23.5 % and 11.6 %, respectively.
진정태(Jeong-Tae Jin),차병헌(Byung-Heon Cha),성세진(Se-Jin Seong) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
An IGBT driver for serially connected pulse switching IGBTs was contructed and tested. The IGBT driver has ten output pulses with 1μ sec pulse width. Its pulse repetition-rate can adjusted from 0to20 ㎑. The output pulses was insulated from 10㎾ high voltage by a pulse transformer. Their voltage amplitude are 18V, voltage rising time 252 nsec, and voltage falling time 200 nsec when IGBT gates with 12nF input capacitance are connected.<br/> <br/>
진정태(Jeong-Tae Jin),차병헌(Byung-Heon Cha),남성모(Sung-Mo Nam),이종민(Jong-Min Lee),성세진(Se-Jin Seong) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
The high repetition rate thyratron trigger pulse generator was constructed and tested. It consists of the pulse generator with 800 V,8 A, and 2μs pulse width, the negative bias power supply with DC(-)150V, and the keep-alive power supply with DC 200 V. For the purpose of fast riding time and high repetition rate operation, a MOSFET was used as a main switching device.
Plused Spark Chamber의 제작과 그 특성조사
강영호,차병헌 慶北大學校 自然科學大學 1983 自然科學論文集 Vol.2 No.-
A pulsed spark chamber with sensitive area 19cm×19cm and 17 gaps is constructed and its characteristics are investigated. The chamber frame is made by lucite plate and 0.1mm aluminum foil is used for electrode. The side of lucite frame is highly polished to obtain the optical transparency. In the chamber, 99.99% argon gas is filled and gas-flowing method is used for eliminating the contamination of O_2. The clearing field of 150V/cm D.C. is applied for obtaining the clean spark images. The constructed spark chamber has the rise time of 100nsec and the delay time of 0.9㎲ec with operating voltage of 12KV, tracks of the cosmic rays has been photographed and particles can be selectively detected by coincidence circuit with scintillation counter.