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SungmanLee,MijeongYun,ByungHeonCha,Cheol-JungKim,SungsooSuk,HyunSuKim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.5
We fabricated an ecient diode-pumped Nd:YAG laser with a plane-parallel resonator for a low M2 beam quality factor and a high output power. In the symmetric and the asymmetric congurations, the stability conditions of the resonator were analyzed in terms of the laser pump power and the distance of the output coupler. The laser characteristics of the output power and the polarization were well explained in association with the resonator stability condition. In particular, a resonator with equally spaced mirrors placed at the thermal focal length generated a laser beam with an output power of 98.3 W and a M2 factor of 10.9.
Wavefront Measuring Algorithm with Improved Measurement Resolution Using a Shack-Hartmann Sensor
Seung-KyuPark,Sung-HoonBaik,Young-SeokSeo,Cheol-JungKim,SungWoongRa 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.6
An adaptive optics system needs to rapidly and accurately compensate for wavefront distortions within limit time. There is a trade-o between the measurement resolution and the measurement speed for an adaptive optics system using a Shack-Hartmann sensor. In this paper, we studied a fastmeasuring algorithm for measuring a wavefront with high resolution to improve the performance of an adaptive optics system. We investigated the relation between the measurement resolution and the measurement speed by using several measuring techniques of the wavefront. After the experiments, we decided on optimal conditions of signal processors for a wavefront measuring device using a Shack-Hartmann sensor and proposed an advanced estimated weighting factor to rapidly calculate the wavefront with a high measurement resolution. The wavefront measuring results and the relation between the measurement resolution and the measurement speed are shown and discussed in this paperd
Effect of Laser Intensity on the Selective Photoionization of the 168Yb Isotope
HyunminPark,S.Kostritsa,DuckheeKwon,YonghoCha,KitaeLee,SungmoNam,JaeminHan,YongjooRhee,Cheol-JungKim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.3
The effect of laser intensity on the selective photoionization of the $^{168}$Yb isotope was investigated experimentally. The three-step photoionization scheme used in our experiment consisted of the excitation from the ground state ($6s^{2}$ $^{1}S_{0}$) to the state of $4f^{13} 6s^{2} 6p$ $(7/2,3/2)_2$ through an intermediate state ($6s6p$ $^{3}P_{1}$), followed by ionization via the autoionization state (52353 cm$^{-1}$). For the excitation, two single-mode dye lasers pumped by a high-repetition laser were used. Ionization was achieved by using a broadband dye laser. The isotope abundance of $^{168}$Yb was measured as a function of the total laser intensity by using a time-of-flight mass spectrometer. A noticeable change in isotope abundance of $^{168}$Yb occurred when the laser intensity was varied. Additionally, numerical analysis was performed by using the density matrix equation to explain the experimental results.