Ultrashort 1.5-microm laser excited upconverted stimulated emission based on simultaneous three-photon absorption.
Simultaneous three-photon excited stimulated emission at (cavityless lasing) approximately 610 nm has been achieved in an organic chromophore solution pumped by approximately 1.5-microm ultrashort coherent radiation. The stimulated emission can be observed only in the forward and backward directions and is characterized by its high directionality and spectral narrowing. The divergence angle for the backward stimulated emission is considerably smaller than that for the forward stimulated emission, which resembles optical phase conjugation.
He
Guang S
GS
Institute for Lasers, Photonics and Biophotonics, The State University of New York at Buffalo, Buffalo, New York 14260-3000, USA.
Dai
Jianming
J
Lin
Tzu-Chau
TC
Markowicz
Przemyslaw P
PP
Prasad
Paras N
PN
D007834:Lasers; D017785:Photons; D011726:Pyridinium Compounds / Q000737:chemistry*; D013343:Styrenes / Q000737:chemistry*
D011726:Pyridinium Compounds; D013343:Styrenes; C475497:trans-4-(p-(N-hydroxyethyl-N-methylamino)styryl)-N-methylpyridinium iodide