Nonlinear optical response of the nematic liquid crystal doped with polymer-azo-dye complex under picosecond laser pulses excitation

In the present chapter we study a nonlinear response of an optical matrix formed by the K2HPO4 crystal doped with TiO2 nanoparticles. Such doped matrix is a nonlinear optical system that is characterized by the cubic non-linear optical response at picosecond laser pulses. Laser pulses release photoelectrons from nanoparticles, which emerge as free carriers on the nanoparticles' surface generating an electric field in local area of the K2HPO4 matrix, which results in the phase transition from the paraphase to the ferroelectric phase state. The appeared ferroelectric phase induces a large polarization around TiO2 nanoparticles, which in turn immediately produces a nonlinear optical response to the laser pulse of the inverse sign, such that the laser beam becomes more focused. The gigantic non-linear susceptibility ??(3) responsible for the phenomenon of focusing of the laser beam is calculated by using the pseudospin model for the description of ferroelectric crystals and the expressions for nonlinear-susceptibility tensor components computed by other researchers.

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Polarizational nonlinear optical response of photonic structures with a liquid crystal defect

Optics Letters ◽

10.1364/ol.34.000488 ◽

2009 ◽

Vol 34 (4) ◽

pp. 488 ◽

Cited By ~ 6

Author(s):

Etienne Brasselet ◽

Andrey E. Miroshnichenko ◽

Deng Feng Chen ◽

Wieslaw Krolikowski ◽

Yuri S. Kivshar

Keyword(s):

Liquid Crystal ◽

Nonlinear Optical ◽

Optical Response ◽

Nonlinear Optical Response ◽

Crystal Defect ◽

Photonic Structures

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NONLINEAR OPTICAL TRANSFORMATION OF PICOSECOND LASER PULSES IN MULTIMODE MICROSTRUCTURED FIBERS WITH LIMITED NONLINEARITY

Proceedings of Telecommunication Universities ◽

10.31854/1813-324x-2018-1-61-66 ◽

2018 ◽

Vol 4 (1) ◽

pp. 61-66

Author(s):

V. Demidov ◽

◽

K. Dukelskii ◽

S. Leonov ◽

A. Matrosova ◽

...

Keyword(s):

Nonlinear Optical ◽

Picosecond Laser ◽

Laser Pulses ◽

Microstructured Fibers ◽

Picosecond Laser Pulses ◽

Optical Transformation

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Нелинейная рефракция диэлектрических монокристаллов при возбуждении ультракотроткими лазерными импульсами ближнего инфракрасного диапазона

Журнал технической физики ◽

10.21883/os.2019.10.48359.173-19 ◽

2019 ◽

Vol 127 (10) ◽

pp. 570

Author(s):

A.И. Водчиц ◽

В.С. Горелик ◽

В.А. Орлович ◽

П.А. Апанасевич

Keyword(s):

Raman Scattering ◽

Impurity Concentration ◽

Nonlinear Optical ◽

Optical Axis ◽

Stimulated Raman Scattering ◽

Picosecond Laser ◽

Laser Pulses ◽

Axis Orientation ◽

Single Beam ◽

Picosecond Laser Pulses

AbstractNonlinear refraction in a number of crystals (KGW, KGW:Eu^3+, Ba(NO_3)_2, BaWO_4, PbMoO_4, and CdWO_4) that are promising for excitation of multifrequency stimulated Raman scattering is investigated by a single-beam Z-scan method. Picosecond laser pulses with a wavelength of 1064 nm generated by a YAG:Nd^3+ laser were used for excitation of nonlinear optical processes. The values of n _2 are compared depending on the type of the crystal, optical-axis orientation, and impurity concentration.

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