ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarBenjamin KleeWigner RCP SZFIDirectional white-light emitters 
powered by a low-power continuous-wave IR laser diode: Unexplained non-linear 
optical effects as a result of disorderTuesday, 28 June 2022, 10:00, Bldg 1, 
auditorium,  
https://wigner-hu.zoom.us/j/83609942103?pwd=VlJYcytQQ1BVSVZ0aEFQbWovenljdz09  
 Meeting ID: 836 0994 2103  Passcode: 067877A few years ago materials 
consisting of small molecules with a pseudo-tetrahedral structure have been 
found to exhibit a strong non-linear optical response to infrared laser 
irradiation: In a crystalline state, the well known second-harmonics 
generation (SHG) effect occurs while in an amorphous state instead a 
continuous spectrum covering the visible regime (hence appearing white) is 
observed. The most interesting property of this white-light generation (WLG) 
effect is that the low divergence of the exciting laser is retained during 
the process, providing a highly directional source of white light. Multiple 
materials have been found to exhibit this effect but still its existence in 
an unknown sample cannot be predicted and the mechanism of this effect is yet 
to be understood. In this talk, I will give an overview of the current 
knowledge of this active field of research. Since amorphicity seems to be a 
requirement for the WLG effect, I will focus on problems and progress 
regarding the structure determination of these materials. Minden 
érdeklődőt szívesen látunk! - Everyone is welcome to attend.Róbert 
Juhászsem-admin AT szfki.hu