title: Nonlinear Raman-Nath diffraction of femtosecond laser pulses.
abstract: We study the nonlinear Raman-Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes observed in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Čerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions.
authors.forename: A M
authors.initials: AM
authors.lastname: Vyunishev
authors.forename: V V
authors.initials: VV
authors.lastname: Slabko
authors.forename: I S
authors.initials: IS
authors.lastname: Baturin
authors.forename: A R
authors.initials: AR
authors.lastname: Akhmatkhanov
authors.forename: V Ya
authors.initials: VY
authors.lastname: Shur