The Theory And Experiment Research Of Femtosecond Pulse Laser In The Quantum Communication

In the dissertation, the Cr⁴⁺:YAG laser which can be used in the quantum communication is researched by the theory and experiment . In chapter one, we discuss the background and development of ultra-short pulse laser and its applications in quantum communications. In chapter two, the mode locking theory is discussed. We introduce the initiatively mode-locking, passively mode-locking, synchronization mode-locking and self mode-locking, etc. The mode-locking technology is very important in the producing the ultra-short pulse. In the chapter three, the cause of producing dispersion and theory of dispersion compensation by prism pair in our Cr⁴⁺:YAG laser are studied. We find that the second order dispersion can be completely compensated by prism pair and the third order dispersion can be partially compensated. So the width of pulse can be more compressed. In the chapter four, we study the Cr⁴⁺:YAG crystal and the measure of ultra-short pulse. Firstly, we talk about the characteristic of Cr⁴⁺:YAG crystal ,rate equation and structure of energy bands. Then we discuss the development of measure technology. In the...