Study Of Negative Dispersion Mirrors And Phase Measurement Technique Of Femtosecond Laser Pulses

In this thesis, I summarize my research work on the design & fabrication of negative dispersion mirrors, as well as on the phase measurement of femtosecond laser pulses by SPIDER apparatus (Spectral Phase Interferometry for Direct Electrical-Field Reconstruction). The main contents of the thesis are listed as follows: 1. In Chapter 1, the development of dispersion compensation and measurement of femtosecond are reviewed. 2. In Chapter 2 ,the principle of negative dispersion mirrors including chirped mirrors and Gires-Tournois interferometer mirrors was described. 3. In Chapter 3, the design and optimization technique of various negative dispersion mirrors were introduced, and the effect of the coating parameters to the mirrors is analyzed. 4. In Chapter 4, the optimized Gires-Tournois mirrors for a Ti:sapphire laser are devised, with which as short as 15 fs pulses are obtained. It proved that we could fabricate high quality negative dispersion mirrors in China. 5. In Chapter 5, I describe the principle of SPIDER apparatus and reconstructed algorithm. I studied relationship among three important parameters, the time delay τ, frequency shear ? and bandwidth of filter windows in SPIDER. I also analyzed the intensity and phase errors resulted by additive and multiplication noises. 6. In Chapter 6, the characterization of a home-made SPIDER apparatus was performed. The effect of block of highly dispersive glass on stretched pulse and the conversion efficiency of BBO crystal at different input pulses were described. 7. In Chapter 7, the operation and characterization of a new and practical SPIDER algorithm software package ? "SPIDERgram" was described. 8. In Chapter 8,experiment verification of our SPIDER apparatus and the software was performed with a Ti:sapphire laser oscillator and amplifier. The measured autocorrelation traces agreed very well with the reconstructed electric field with SPIDER. Also, the measured group delay dispersion of known BK7 glass agreed well with calculation. 9. In Chapter 9, I summeried my themes and said something about future work.