Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
권호 표지

Fabrication of Transient Absorption Spectroscopic System and Measurement of Transient Absorption Changes of DDI

순간흡수 분광학 측정장치 구성 및 DDI의 순간흡수율 변화 측정

  • Seo, Jung-Chul (Korea Research Institute of Standards and Science, Spectroscopy Laboratory) ;
  • Lee, Min-Yung (Korea Research Institute of Standards and Science, Spectroscopy Laboratory) ;
  • Kim, Dong-Ho (Korea Research Institute of Standards and Science, Spectroscopy Laboratory) ;
  • Jeong, Hong-Sik (Department of Physics, Yonsei University) ;
  • Park, Seung-Han (Department of Physics, Yonsei University) ;
  • Kim, Ung (Department of Physics, Yonsei University)
  • Published : 1991.12.01
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Abstract

Recently, the developments in generating and amplifying ultrashort optical pulses $(ps=10^{-12}s or fs=10^{-15}s)$ have imposed on great advances in the time-resolved laser spectroscopy. Especially, the transient absorption spectroscopy has a wide application range and the main idea of this technique is pump & probe method. After the pump pulse makes the material an excited or a transient states, the probe pulse is sent through the material to measure the absorbance change due to the transient states. Here, if the absorbance change was measured by the time delay between pump & probe pulses, the dynamic information of the excited or the transient states (the transient abnsorption changes by time & wavelength) can be obtained. At our laboratory, the ultrashort optic1 pulse (

최근들어 극초단 광학펄스를 생성하고 증폭하는 기술의 발달로 인하여 시분해 레이저 분광학에 많은 영향을 끼치게 되었다. 그 중에서도 응용성이 넓은 순간흡수분광학장치를 본 연구실에서 개발하였다. 이 기술은 고출력 레이저 펄스를 이용하여 white light continuum pulse를 생성시켜 이를 조사빔으로 이용하고, pump pulse는 원래 상태의 레이저를 이용하는 것이다. 순간흡수율 변화를 여러 파장에서 측정가능하도록 photodiode array를 이용하였으며, pump와 probe pulse의 시간차이에 의한 순간흡수율 변화를 색소의 일종인 DDI를 이용하여 측정하였다.

Keywords