Direct four-photon excitation of amplified spontaneous emission in a nonlinear organic chromophore.
We report four-photon pumped amplified spontaneous emission in an organic chromophore. The phenomenon is observed when intense infrared laser radiation illuminates a nonlinear chromophore solution. As a result of this illumination, a strong and highly directional radiation in the visible wavelength range is generated in both the forward and the backward directions, with an angular divergence similar to that of the pump beam.
The Institute for Lasers, Photonics and Biophotonics, NY, USA. ppm@acsu.buffalo.edu
Przemyslaw P
PP
Markowicz
Guang S
GS
He
Paras N
PN
Prasad
D005456:Fluorescent Dyes / Q000032:analysis / Q000737:chemistry; D007834:Lasers; D008422:Materials Testing; D036641:Microscopy, Fluorescence, Multiphoton / Q000379:methods*; D017711:Nonlinear Dynamics; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013267:Stilbenes / Q000032:analysis* / Q000737:chemistry*
D005456:Fluorescent Dyes; D009930:Organic Chemicals; D013267:Stilbenes