Random laser action with coherent feedback is realized in ZnO-SiO2composite films, which consists of ZnO clusters embedded in SiO2dielectric matrix prepared by sol-gel technique. The films are deposited on silicon substrate with a SiO2buffer layer to form a waveguide structure. Ultraviolet lasing at room temperature is observed from the composite films with ZnO : SiO2molar ratio varying between 1 : 5 and 1 : 30. The corresponding lasing wavelength and linewidth under 355-nm optical excitation are found to be ∼388 nm and less than 0.6 nm, respectively. Our experiment has shown that the proper control of light confinement inside the random cavities leads to coherent random lasing.
|Number of pages||3|
|Journal||IEEE Photonics Technology Letters|
|Publication status||Published - 1 Nov 2004|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering