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Study on the Focusing Position Effects in a Diode End-pumped Nd:YAG Laser
김용기,서효정,김하나,류지욱,김덕현,김용기 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.21
A multi-kHz high-repetition-rate laser-diode-pumped Nd:YAG laser was developed, and its lasing properties were demonstrated for laser optimization. The dependence of the output power on the pump beam’s focusing position in the Nd:YAG crystal was determined. The optimum focusing position of the pump beam for efficient extraction of the diode’s pump energy was confirmed to be 1 mm inside the laser crystal from the surface of the Nd:YAG. This focusing position is independent of the length of the laser crystal. The beam quality factor, M2, was decreased from values of 2.8 ∽ 2.9 to less than 1.3 in both the CW and the pulsed modes by insertion of a 500 ∽ 600 µm aperture inside the laser cavity. In second harmonic generation (SHG), we found that the output power and the pulse width were very sensitive to the LBO operating temperature. We confirmed that controlling the LBO crystal’s temperature was very important for efficient and stable operation of the 532 nm laser.
金龍基,李相潤 동국대학교 사찰조경연구소 1992 寺刹造景硏究 Vol.1 No.-
The purpose of this study was to grasp and analyze the organization of the transitional space in our 3 typical temples : Tongdo temple, Heaein temple, Bumeo temple. Analysis for landscape composition based on visual experience, characteristic of human behavior for visual object in landscape was to recognize inter-dependence between men and his physical environment through analysis for landscape composition. As the method, Visual volume of the object-Recognition distance were chosen and were made with consideration of sequencial experience for space based on human movement.