Nonlinear pulse compression by the second-harmonic generation in quasiphase and group-velocity matched samples
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- Sapaev, U.K., Kulagin, I.A., Usmanov, T. et al. J Russ Laser Res (2011) 32: 41. doi:10.1007/s10946-011-9187-1
We investigate numerically the second-harmonic generation from near infrared 100 fs pulses in periodically and aperiodically poled lithium niobate crystals, taking into account the group-velocity mismatch, the group-velocity dispersion, and self-action effects. For the first time, we show that a tenfold pulse compression can be obtained at both fundamental and second-harmonic frequencies. The mechanism of compression and the pertinent quality factors are discussed.