This Letter describes the fabrication and operation of a single-chip white-laser device. The laser device has a multilayered structure consisting of three laser layers. Each laser layer comprises polymer claddings and a waveguide core doped with organic dye. In each laser layer, grating corrugations were fabricated by UV-nanoimprint lithography that act as distributed-feedback cavity structures. Under optical pumping, lasing output with red, green, and blue colors was simultaneously obtained from the sample edge.

We have demonstrated near-infrared amplified spontaneous emission and laser emission from fluorinated-polyimide waveguides doped with an organic dye, 5,6-dichloro-2[8-(p-dimethylaminophenyl)-2,4-neopentylene-1,3,5,7-octatetraenyl]-3-ethylbenzothiazolium perchlorate (LDS950). The planar waveguides doped with 1wt% of the dye, 10mm in length and 9.3μm in thickness, have exhibited amplified spontaneous emission and optical gain around 960nm under optical pulse pumping. A good optical gain coefficient of 1.4mm−1 was obtained. Furthermore, by using the cleaved waveguide edges as reflective facets, sharp emission peaks showing laser oscillation at 970nm were observed under the optical pulse pumping. The lasing threshold was 0.22mJ∕cm2. The lasing wavelength of 970nm is the longest for solid state dye-doped polymeric lasers.

Microcavity systems with organic luminescent materials have a hot prospect for room-temperature cavity-polariton devices. The polariton dispersion relation of organic microcavities is significantly different from that of inorganic microcavities due to the strong localization of Frenkel excitons. Also photoexcited particles will undergo a different cooling mechanism until they reach the polariton ground state. In the characterization of efficient polariton condensates, therefore, the polariton cooling dynamics as well as the kinetics of the polariton eigenstate should be measured. Here we present experimental studies on ultrafast dynamics of cavity polaritons in an organic singlecrystal microcavity under nonresonant pumping. In time-resolved photoluminescence measurements we observed, for the first time, an ultrafast dynamics of stimulated cooling of the organic cavity polariton. Transient transmission measurement enabled us to investigate the detailed renormalization dynamics of the polariton eigenstate. The results clearly demonstrated the prospect of organic microcavities for room-temperature polaritonic devices.

texture match, and the donor and recipient sites functioned well without severe deformities. We designed the V-Y flap without spreading out the lateral side wall subunit of the nose. The flap was dissected from the perichondrium in the lateral side wall of the nose, and the pedicle included the transverse portion of the nasalis muscle. The flap is adaptable for defects measuring up to 15 mm in diameter without causing a conspicuous scar.As with open treatment, skin grafting and other local flaps, the application of a V-Y flap is one of the most useful and convenient procedures for reconstructing the lateral wall of the nose. We therefore recommend this easy technique since it has been demonstrated to be associated with good patient acceptance.