OYO BUTURI Vol.86 No.9 (2017)
Our Research

Development of an innovative technique to measure transient absorption: RIPT method

Tatsuo NAKAGAWA1, Ryuzi KATOH2

Transient absorption (TA) spectroscopy has been used to study photo-induced fast processes. Although this is a useful technique, a major problem, the difficulty of observation in the time window from 1 ns to 10 ns, has limited its application. To overcome this “gap” problem, we have proposed an innovative TA technique: the “Randomly - Interleaved - Pulse - Train (RIPT) method”. The RIPT method is based on novel ideas, including ‘probing by a pulse train’, ‘asynchronous operation of pump and probe light sources’ and ‘passive measurement of delay times’. We have realized TA measurements based on the RIPT method by using the latest sub-nanosecond light sources and high-speed digital circuit technology. Here we describe the principle of the RIPT method and how this new technique opens up new research fields.

  • 1 Unisoku Co., Ltd., Optical Instruments Division
  • 2 Nihon University, College of Engineering
OYO BUTURI Vol.86 No.9 p.775 (2017)