Author: Hayakawa, Y.
Paper Title Page
TUP060 Potential Photochemical Applications of the Free Electron Laser Irradiation Technique in Living Organisms 505
 
  • F. Shishikura, K. Hayakawa, Y. Hayakawa, M. Inagaki, K. Nakao, K. Nogami, T. Sakai, T. Tanaka
    LEBRA, Funabashi, Japan
  • T. Kii, H. Ohgaki, H. Zen
    Kyoto University, Kyoto, Japan
  • T. Sakae
    Nihon University School of Dentistry at Matsudo, Matsudo-shi, Japan
  
  In 2001, the Lab­o­ra­tory for Elec­tron Beam Re­search and Ap­pli­ca­tion (LEBRA) achieved the first las­ing of 0.9–6.5 mi­crons near-in­frared free elec­tron lasers (FELs), in which higher har­mon­ics were gen­er­ated by using non­lin­ear op­ti­cal crys­tals. Fol­low­ing this break­through, we have paid con­sid­er­able at­ten­tion to LE­BRA-FEL’s po­ten­tial for in­ves­ti­gat­ing pho­to­chem­i­cal re­ac­tions in liv­ing or­gan­isms. We have es­tab­lished a mi­cro-ir­ra­di­a­tion tech­nique using an op­ti­cal fiber con­nected to a fine ta­pered glass rod of <5 mi­crons in di­am­e­ter, en­abling FEL ir­ra­di­a­tion of a sin­gle cell and even the inner or­ganelles of live cells. We then ver­i­fied that vis­i­ble LE­BRA-FEL light can con­trol the ger­mi­na­tion of let­tuce seeds, a well-known pho­to­chem­i­cal re­ac­tion, and de­ter­mined that red light (660 nm FEL) pro­motes ger­mi­na­tion and far-red light (740 nm FEL) in­hibits it. Here, we sum­ma­rize the ef­fi­ciency of var­i­ous vis­i­ble wave­lengths of LE­BRA-FEL light, rang­ing from 0.4–0.8 mi­crons, for reg­u­lat­ing pho­tore­ac­tions in let­tuce seeds and we also sum­ma­rize the ef­fi­ciency of in­frared wave­lengths up to 20 mi­crons, which can be gen­er­ated by com­bined use of the LE­BRA-FEL and the Kyoto Uni­ver­sity FEL.
We thank the staff of Prof. T. Morii (Institute of Advanced Energy, Kyoto Univ.) for helpful assistance. 		 
 
TUP077 Characteristics of Transported Terahertz-wave Coherent Synchrotron Radiation at LEBRA 541
 
  • N. Sei, H. Ogawa
    AIST, Tsukuba, Ibaraki, Japan
  • K. Hayakawa, Y. Hayakawa, M. Inagaki, K. Nakao, K. Nogami, T. Sakai, T. Tanaka
    LEBRA, Funabashi, Japan
  
  Funding: This work has been supported in part under the Visiting Researcher's Program of the Research Reactor Institute, Kyoto University, and ZE Research Program ZE25B-7, Kyoto University.
Nihon Uni­ver­sity and Na­tional In­sti­tute of Ad­vanced In­dus­trial Sci­ence and Tech­nol­ogy have jointly de­vel­oped ter­a­hertz-wave co­her­ent syn­chro­tron ra­di­a­tion (CSR) at Lab­o­ra­tory for Elec­tron Beam Re­search and Ap­pli­ca­tion (LEBRA) in Nihon Uni­ver­sity since 2011. We have al­ready ob­served in­tense ter­a­hertz-wave ra­di­a­tion from a bend­ing mag­net lo­cated above an un­du­la­tor ded­i­cated for an in­frared free-elec­tron laser (FEL), and con­firmed it to be CSR [*]. More­over, we have trans­ported the CSR to an ex­per­i­men­tal room, which is next to the ac­cel­er­a­tor room across a shield wall, using an in­frared FEL beam­line. The trans­ported CSR beam can be ap­plied to two-di­men­sional imag­ing and spec­troscopy ex­per­i­ments. In this pre­sen­ta­tion, char­ac­ter­is­tics of the CSR beam and ap­pli­ca­tions for the CSR beam at LEBRA will be re­ported.
* N. Sei et al., “Observation of intense terahertz-wave coherent synchrotron radiation at LEBRA”, J. Phys. D, 46 (2013) 045104.