Journal of Nonlinear Optical Physics & Materials

In this paper, we study oscillating solutions of the 1D-quintic nonlinear Schrödinger equation with the help of Wigner's quasiprobability distribution in quantum phase space. An "absolute squeezing property", namely a periodic in time total localization of wave packets at some finite spatial points without violation of the Heisenberg uncertainty principle, is analyzed in this nonlinear model.

The semi-empirical method ZINDO was employed to study relationship between macroscopic optical nonlinear parameter μβ/MW (where μ is the dipole moment, β is the first hyperpolarizability, and MW is molecular weight) and the number of parallel non-conjugated D-π-A units in a chromophore. The computational results show that macroscopic optical nonlinear parameter μβ/MW value increases remarkably from 1.64 to 2.53 with increasing the number of parallel and non-conjugated p-Nitroaniline (PNA) units in a chromophore from 1 to 3. Then the μβ/MW value decreases rapidly from 2.53 to 0.43 with increasing the number of PNA units in a chromophore from 3 to 5. It suggests that design of chromophores containing two or three parallel non-conjugated D-π-A units would be an effective strategy for increasing the first hyperpolarizability and macroscopic optical nonlinearity of designed NLO materials.

This paper, studies the long-short-wave interaction (LS) equation. An optical soliton solution is obtained by the exp-function method and the ansatz method. Subsequently, we formally derive the dark (topological) soliton solutions for this equation. By using the exp-function method, some additional solutions will be derived. The physical parameters in the soliton solutions of ansatz method: amplitude, inverse width, and velocity are obtained as functions of the dependent model coefficients.

Single crystals of L-valine zinc hydrochloride (LVZHCl), a novel semi-organic nonlinear optical material were synthesized and grown from aqueous solution by slow evaporation method at room temperature. The cell parameters of LVZHCl had been determined using single crystal X-ray diffraction technique. The linear and non-linear optical properties of the crystals were studied by Fourier Transform Infrared, Ultraviolet Visible Near infrared, ac impedance, laser damage threshold, and second harmonic generation analysis. The thermal stability of the crystals was assessed by Differential thermal-Thermogravimetric analysis. The crystallinity and mechanical properties of the crystals were studied by Dielectric behavior and Vickers microhardness test.

We report on the measurements of the nonlinear reflective index coefficient for curcumin at three different wavelengths using a Z-scan technique. This material is found to be a new type of natural nonlinear media. It shows a large negative nonlinear refractive index of the order of 10^–6 cm²/W. The origin of the nonlinearity was investigated by comparison of the formalism that is known as the Gaussian decomposition model with the thermal lens model. The nonlinear refractive index was found to vary with intensity and reveals that curcumin can be a promising material for optical limiting.

By using the three-dimensional complex cubic-quintic Ginzburg-Landau equation, the energy transfer process is investigated numerically for collisions of two dissipative optical bullets in a dissipative system. For high energy solitons, as a result of energy transfer, one soliton gains energy to generate a double bullet complex, and the other one loses energy can survive in collisional process. In addition, we find that the variations of the bullets velocity show regular properties during mutiple collisions with phase difference.

A quantum cataloguing scheme to identify any unknown quantized cavity field state using the atom interference is proposed. The scheme consists of sending a two-level state atom through two cavities, with Bragg and Raman-Nath regimes, respectively. We inveterate the atom interference from the second cavity to achieve different interference patterns which depend on the photons statistics.

We analyze modulation instability (MI) in lossy metamaterials (MMs) with both nonlinear polarization and nonlinear magnetization. A detailed discussion on the role of the nonlinear electric polarization, nonlinear magnetic susceptibility and linear loss on the MI is presented. It is found that the nonlinear magnetization and linear loss play an important role in determining the MI in nonlinear MMs. Linear stability analysis predicts that MI may occur in the MMs with self-defocusing nonlinearity due to the negative-index of MMs. In particular, the nonlinear magnetic susceptibility changes the generation condition of MI seriously, it can be used to enhance or depress the MI depending on the sign of the nonlinear magnetic susceptibility. Finally, the influence of the loss in MMs on the MI is discussed.

We propose and demonstrate the most compact and stable multiwavelength Brillouin Erbium Fibre Laser (MBEFL) by incorporating a 10-km long nonzero dispersion shifted fiber (NZ-DSF) acting as a Brillouin gain medium. This proposed configuration with only a single ring cavity is able to produce odd-order Brillouin Stokes waves appear in the backward direction with the line spacing 0.16nm (~20GHz). Brillouin pump and the even Stokes orders act as a Brillouin pump in the forward direction using a pre-amplified Brillouin power approach in a ring cavity. Up to 12 odd-order Brillouin Stokes lines are observed with the Brillouin pump power of around 8 dBm at injected 980 nm pump power of 125 mW. The anti-Stokes lines are also obtained due to four wave mixing and bidirectional operation.

Experimental studies of the Raman scattering of the band of C = O vibrations of acetone (1710 cm^–1) showed that the parallel and perpendicular polarized components have a large half-width (respectively, 11.6 and 18 cm^–1) and also the bands' maxima of these components are shifted by ~5 cm^–1. In the neutral solvent (heptane), the difference of the maxima position of the bands decreases. Calculations showed that the molecules of acetone can aggregate to form a dimer with the energy gain of 10.1 kJ/mole. In the dimer several hydrogen bonds are formed between the oxygen atom of one molecule and the hydrogen atoms of CH₃-group of another molecule. In an aqueous mixture of acetone, according to calculations, there is a possibility for formation of dimers and closed trimer aggregates with the energy gain, respectively, 19.1 and 45.8 kJ/mole. Calculation showed that symmetric and antisymmetric O–H vibrations of water are displaced in the interaction with acetone to lower frequencies, respectively, to 3808.4 and to 3931.8 ^–1.

In this work, second harmonic generation has been investigated for radiation in IR-range of spectrum at the constant-intensity approximation. The detailed analysis of nonlinear interaction of optical waves have been studied in CGA, ZAP and AgGa_0.6In_0.4Se₂ crystals and the comparison of the obtained results have been made on conversion efficiency with experimentally calculated values. The conditions for realization have been determined for the regime close to the uncritical angular phase matching. The recommendations are suggested on elaboration of the reliability of highly efficient generators for second harmonic in the IR-range, specially the generators of second harmonic of the CO₂ lasers.