Abstract
The time behaviour of ultrashort laser pulses can be changed and optimized for a specific application by the combination of pulse-compression and pulse-shaping techniques. A pulsed laser beam at a central wavelength of 800 nm and 80 fs pulse duration is guided through a hollow fibre of 70cm length, filled with argon gas. Due to the nonlinear optical effect of self-phase modulation the pulse spectrum broadens during propagation. After separating the spectral components of the modified pulse with a prism and lens setup, a deformable-membrane mirror is used to control the spectral phase. By means of an evolutionary algorithm, it was possible to remove higher-order phase contributions in the final pulse shape as well as additional dispersion.
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