Second harmonic generation in multi-domain χ2 media: from disorder to order

M Ayoub, J Imbrock, C Denz - Optics express, 2011 - opg.optica.org
We investigate systematically the evolution of second harmonic generation in strontium
barium niobate with different degrees of disorder of its χ^ 2 nonlinearity. These different …

Cascaded Čerenkov third-harmonic generation in random quadratic media

M Ayoub, P Roedig, J Imbrock, C Denz - Applied Physics Letters, 2011 - pubs.aip.org
We investigate experimentally and theoretically the conical emission of Čerenkov-type third-
harmonic generation in strontium barium niobate of random 2D-χ (2) distribution. The …

Ferroelectric domain diagnostics near the phase transition by Čerenkov second-harmonic generation

M Ayoub, J Imbrock, C Denz - Optical Materials Express, 2017 - opg.optica.org
We experimentally investigate ferroelectric domains close to the phase transition in a
nonlinear photonic crystal exhibiting disordered domain distribution implementing Čerenkov …

Čerenkov-type second-harmonic spectroscopy in random nonlinear photonic structures

M Ayoub, P Roedig, K Koynov, J Imbrock, C Denz - Optics express, 2013 - opg.optica.org
We report on experimental and theoretical studies of Čerenkov-type second-harmonic
generation in random nonlinear photonic structures with different two-dimensional …

Nonlinear Raman–Nath diffraction of femtosecond laser pulses

AM Vyunishev, VV Slabko, IS Baturin… - Optics Letters, 2014 - opg.optica.org
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 …

Domain-shape-based modulation of Čerenkov second-harmonic generation in multidomain strontium barium niobate

M Ayoub, P Roedig, J Imbrock, C Denz - Optics letters, 2011 - opg.optica.org
We study experimentally and numerically the second-harmonic Čerenkov emission with two
different characteristic azimuthal intensity distributions in strontium barium niobate with a …

Čerenkov nonlinear diffraction in random nonlinear photonic crystal of strontium tetraborate

AM Vyunishev, AS Aleksandrovsky, AI Zaitsev… - Applied Physics …, 2012 - pubs.aip.org
Čerenkov-type second harmonic generation of femtosecond pulses in random one-
dimensional nonlinear photonic crystal of strontium tetraborate is investigated …

Tunable femtosecond frequency doubling in random domain structure of strontium tetraborate

AS Aleksandrovsky, AM Vyunishev, VV Slabko… - Optics …, 2009 - Elsevier
Efficient tunable femtosecond phase-matched noncollinear second-harmonic generation in
randomized nonlinear photonic crystal of strontium tetraborate is obtained. Spatial spectrum …

Controlling the effective second-order susceptibility in random quadratic media

M Ayoub, M Paßlick, J Imbrock, C Denz - Optics Express, 2015 - opg.optica.org
We study systematically the effect of spatial disorder of ferroelectric domains in nonlinear
media on the polarization properties of optical frequency conversion. Experimentally …

Characterization of aperiodic domain structure in lithium niobate by spontaneous parametric down-conversion spectroscopy

AS Solntsev, GK Kitaeva, II Naumova… - Laser Physics …, 2015 - iopscience.iop.org
We develop a technique for detailed analysis of aperiodically poled crystalline nonlinear
transfer functions. The method allows precise evaluation of 1D aperiodic domain structure …