Note: Improved technique for ultrashort lasers pulse width stabilization

We have developed an improved pulse width stabilization method based on the second harmonic generation (SHG) technique using the relationship between pulse width, input intensity, and SHG intensity. On the basis of an analysis of the improved method accuracy, we then proposed a novel processing algorithm, which allowed us to increase the accuracy of pulse width stabilization to 1.2%. We applied this method to a picosecond Yb-doped fiber laser, which offers pulse widths ranging from 10 to 14 ps. We have demonstrated, for what is believed to be the first time, pulse width stabilization of this laser with an absolute error of less than 200 fs.