P. Stanislovaitis, A. Matijošius, V. Šetkus, and V.
Smilgevičius
In this work we investigate the light
patterns generated by paraxial radial and azimuth polarization
beams in type II nonlinear crystal. We show that in paraxial
case second harmonic intensity pattern generated by the
radial/azimuth polarization beams can be expressed similarly
to Hermite-Gaussian HG
11 mode. In addition,
numerical simulations were carried out, taking into account
diraction, walk-off, and pump depletion. The numerical
simulations have shown that even with pump depletion, the
resulting second harmonic beam consists of 4 maxima. Also
experimental results are presented, which con rm theoretical
predictions. Interference patterns indicate phase shifts of
between neighboring maxima.
radial /
azimuthal polarization beams, Hermite-Gaussian mode, second
harmonic generation
PACS: 42.60.Jf,
42.65.Ky, 42.79.-e
P. Stanislovaitis, A.
Matijošius, V. Šetkus, and V. Smilgevičius
Vilniaus universiteto Fizikos fakultetas, Kvantinės
elektronikos katedra, Vilnius, Lietuva
Darbe ištirti antrosios
harmonikos generavimo ypatumai antrojo tipo netiesiniame
kristale, žadinant ją radialinės / azimutinės poliarizacijos
kaupinimo pluoštais. Teoriškai parodyta, kad paraksialiniu
atveju generuojamos antrosios harmonikos intensyvumo skirstinys,
nepaisant kaupinimo pluoštų nuskurdinimo bei
apertūrinio-diafragminio reiškinio, yra išreiškiamas
Ermito-Gauso HG11 moda. Atlikus skaitinius modeliavimus,
parodyta, kad antrosios harmonikos intensyvumo skirstinys, net
ir įskaitant difrakciją, kaupinimo pluoštų nuskurdinimą ir
apertūrinį-diafragminį reiškinį, susideda iš keturių maksimumų.
Eksperimentinių tyrimų rezultatai patvirtina teorinių
skaičiavimų rezultatus. Remiantis užregistruotų interferencinių
skirstinių analize nustatyta, kad fazių skirtumas tarp gretimų
antrosios harmonikos intensyvumo skirstinio maksimumų yra
lygus
radianų.
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