The Spectral Broadening Of High-power Femtosecond Laser And Three-dimensional Optical Storage

Femtosecond laser has many merits such as ultra-short pulse breadth, high irradiation intensity, and keeping clear of substance and fast response during processing matter . Based on those virtues, femtosecond laser pulse can be used many fields, for example, ultra-precision machining, the fabrication of micro- photonic devices, nano-operation in bioengineering and biatrology, and three dimensional optical storage. With the deep research on the interaction of matters under limit condition, pulse width desired is much shorter and intensity of laser needed is much higher, so technology and means which can produce ultra-short and high intensity laser pulse are sought.This dissertation include two contents: in section 1, the theoretic and experimental research on three-dimension optical data storage based on the conversion of color centers has been practiced; in section2, the theoretic and experimental research on spectrum-broaden using hollow fiber filled gas has been carried out, it is foundation to further compress pulse-width and obtain high intensity femtosecond laser pulse.Compared with other three-dimension optical data storage technology based on destroy mechanics, color-center optical storage is welcome because energy of its writing beam is lower and reading formation can be compatible with existent optical disc technology. In section 1 of this thesis, according to the phenomenon of the conversion of F₂ centers to F₃⁺ centers induced by IR pulse laser in LiF: F₂ crystal we find out firstly and the difference of fluorescence spectrum in the two centers, the qualitative analysis of this conversion is given, and the principle experiment of the color-center optical 3D data storage was realized.