title: Laser induced white lighting of graphene foam.
abstract: Laser induced white light emission was observed from porous graphene foam irradiated with a focused continuous wave beam of the infrared laser diode. It was found that the intensity of the emission increases exponentially with increasing laser power density, having a saturation level at ca. 1.5 W and being characterized by stable emission conditions. It was also observed that the white light emission is spatially confined to the focal point dimensions of the illuminating laser light. Several other features of the laser induced white light emission were also discussed. It was observed that the white light emission is highly dependent on the electric field intensity, allowing one to modulate the emission intensity. The electric field intensity ca. 0.5 V/μm was able to decrease the white light intensity by half. Origins of the laser-induced white light emission along with its characteristic features were discussed in terms of avalanche multiphoton ionization, inter-valence charge transfer and possible plasma build-up processes. It is shown that the laser-induced white light emission may be well utilized in new types of white light sources.
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Strek
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Robert
authors.initials: R
authors.lastname: Tomala
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Mikolaj
authors.initials: M
authors.lastname: Lukaszewicz
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Bartlomiej
authors.initials: B
authors.lastname: Cichy
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Gerasymchuk
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Pawel
authors.initials: P
authors.lastname: Gluchowski
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Marciniak
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Artur
authors.initials: A
authors.lastname: Bednarkiewicz
authors.affiliation: Institute of Low Temperatures and Structural Research, Polish Academy of Science, 50-422 Wroclaw, Poland.
authors.forename: Dariusz
authors.initials: D
authors.lastname: Hreniak