http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김용기 (검색결과 1,910 건)
- 무료
- 기관 내 무료
- 유료
-
-
-
-
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.
-
-
-
-
-
金鏞淇 啓明大學校 産業經營硏究所 1997 經營經濟 Vol.30 No.1
The history of mankind reaches 1 million years. Among them, the hunting age was 990,000 years of age. The agricultural age was nothing but 10,000 years(1%) of age. And the rice agriculturl age of Korea and Japan was only 2,000 - 3,000 years of age. They say Europe and America are the individualism because there had been hunting culture, Korea and Japan are the collectivism because there had been rice agricultural culture. But it is undeniable that the individualism has been imprinted in the gene of Korea and Japan, too. Therefore, it raise instinctual drift to return to the individualism owing to environment condition even though the collectivism by rice agricultural culture was constituted to a certain degree. The collectivism has a lot of ethical elments. Therefore, we have to effort to maintain the collectivism by self regulate.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
