18 February 2009 Filamentation and self-compression of femtosecond laser pulses in optical media
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We have investigated the filamentation and self-compression of femtosecond laser pulses in different optical media such as argon gas and fused silica by employing a model developed in the frequency domain. In the case of fused silica, we investigate the nonlinear propagation of femtosecond laser pulses with central wavelengths of 800 nm and 1550 nm, which correspond to the normal group velocity dispersion (GVD) and anomalous GVD regimes, respectively. We have found that the duration of the laser pulse can be self-compressed into less than 10fs from 50 fs for a 1550 nm laser pulse. However, for an 800 nm laser pulse, the self-compressed pulse can only have a duration of about 26 fs. Nevertheless, in the case of 800 nm, by spectral analysis and control, we can obtain sub-5 fs pulses based on the self-guided filaments of femtosecond laser beams. This method avoids the difficulty of complete spectral phase compensation due to the considerable high-order chromatic dispersion.
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Jiansheng Liu, Jiansheng Liu, Zhanxin Wang, Zhanxin Wang, Ruxin Li, Ruxin Li, Zhizhan Xu, Zhizhan Xu, } "Filamentation and self-compression of femtosecond laser pulses in optical media", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72760Y (18 February 2009); doi: 10.1117/12.823376; https://doi.org/10.1117/12.823376

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