Modelling half-cycle pulse generation in ZnGeP2 crystal

Аполлонов, В. В.; Shakir, Yu. A.; Gribenyukov, A. I.

doi:10.1088/0022-3727/35/13/304

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Nonlinear optics is a second major application field of chalcopyrite compounds [5]. Promising materials are the chalcogenides AgGaS 2 , AgGaSe 2 , and AgGaTe 2 [6,7] and the pnictides ZnGeP 2 and CdGeAs 2 [5,8]. In particular on the basis of AgGaS 2 a number of different devices has been proposed theoretically and realised experimentally [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Neumann¹

2004

Cryst. Res. Technol.

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The present state of knowledge of the elastic properties of the ternary chalcopyrite compounds and some related materials is reviewed. Results of experimental elastic constant determinations are critically evaluated by comparing with other experimentally available material parameters that directly depend on the elastic constants. Possible reasons for existing discrepancies and obvious inconsistencies in the experimental data are discussed. The results of theoretical calculations of the elastic constants of these compounds based on different theoretical models and approaches are compared with experimental data and are assessed concerning achievable accuracy and reliability.

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Section: Introductionmentioning

confidence: 99%

Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Neumann¹

2004

Cryst. Res. Technol.

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“…In previous experiments and most theoretical studies, the aligning interaction was due to a polarized electromagnetic wave interacting with the anisotropic molecular polarizability, while the orienting interaction was brought about by subjecting the molecule to a superim-posed electrostatic field. Current technologies make it possible to produce electromagnetic pulses that consist of only a few oscillation cycles [29][30][31][32][33][34]. Moreover, the electromagnetic wave's electric field distribution over the cycles can have a bias, with a higher oscillation amplitude in one direction than in the other.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of polar polarizable rotors acted upon by unipolar electromagnetic pulses: From the sudden to the adiabatic regime

Mirahmadi

Schmidt

Karra

et al. 2018

The Journal of Chemical Physics

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We study, analytically as well as numerically, the dynamics that arises from the interaction of a polar polarizable rigid rotor with single unipolar electromagnetic pulses of varying length, ∆τ , with respect to the rotational period of the rotor, τ r . In the sudden, non-adiabatic limit, ∆τ τ r , we derive analytic expressions for the rotor's wavefunctions, kinetic energies, and field-free evolution of orientation and alignment. We verify the analytic results by solving the corresponding timedependent Schrödinger equation numerically and extend the temporal range of the interactions considered all the way to the adiabatic limit, ∆τ τ r , where general analytic solutions beyond the field-free case are no longer available. The effects of the orienting and aligning interactions as well as of their combination on the post-pulse populations of the rotational states are visualized as functions of the orienting and aligning kick strengths in terms of populations quilts. Quantum carpets that encapsulate the evolution of the rotational wavepackets provide the space-time portraits of the resulting dynamics. The population quilts and quantum carpets reveal that purely orienting, purely aligning, or even-break combined interactions each exhibit a sui generis dynamics. In the intermediate temporal regime, we find that the wavepackets as functions of the orienting and aligning kick strengths show resonances that correspond to diminished kinetic energies at particular values of the pulse duration. * burkhard.schmidt@fu-berlin.de † bretislav.friedrich@fhi-berlin.mpg.de arXiv:1806.11329v3 [quant-ph] 9 Aug 2018 basis set for expanding the time-dependent wavefunction, with the resultwhere E J = J(J + 1). Note that the expansion coefficients, C J J 0 ,M 0 , are time-independent, in consequence of the fact that the time dependence in Eq. (10) only arises from the e −iJ 2 τ term.The final form of the wavefunction in the sudden limit is given by (for a detailed derivationare the Clebsch-Gordan coefficients and only c J is a function of the kick strengths, cf. Eq. (A5).Throughout the remainder of this paper, we restrict ourselves to the case when the free rotor is initially in its ground state, J 0 = M 0 = 0. As a result, the C J J 0 ,M 0 coefficients in Eq. (11) reduce toThe coefficients C J J 0 ,M 0 arising in Eq. (11) can be found by expanding the time-independent term in Eq. (10) in terms of spherical harmonics,with Γ the gamma function; we applied the Legendre duplication formula [49] to achieve the final form of Eq. (A4).By making use of Eq. (A2) and Eq. (A5) we can evaluateC J J 0 ,M 0 in Eq. (A1) as follows,where J 1 M 1 , J 2 M 2 |J 3 M 3 are the Clebsch-Gordan coefficients, which vanish unless |J −J 0 | ≤ J ≤ J + J 0 and J + J + J 0 is an even integer [49]. Finally, we obtainIn all the analytic results presented in this paper, Eqs. (A5) and (A7) were found to converge satisfactorily for κ and J up to 80 and 50, respectively (e.g. for P η = P ζ = 8 the 80th term of the sum over k in Eq. (A5) is close to 10 −30 for C 50 0,0 ≈ 1...

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“…Efficient terahertz (THz) sources continue to attract world-wide research interest for their potential applications in spectroscopy, biomedical diagnostics, communication, and so on. [1−5] Difference frequency generation (DFG) is one effective way to produce highpower, narrow-band coherent THz sources in nonlinear crystals such as ZnGeP 2 , [6] periodically poled MgO:LiNbO 3 , [7] GaAs [8] and GaSe. [9] DFG was designed to satisfy the wave vector phase-matching condition in nonlinear crystals.…”

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confidence: 99%

Two Schemes for Generating Efficient Terahertz Waves in Nonlinear Optical Crystals with a Mid-Infrared CO ₂ Laser

Rao¹,

Wang²,

Lu³

et al. 2011

Chinese Phys. Lett.

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Terahertz wave generation is explored on the basis of difference frequency generation in nonlinear optical crystals with a mid-infrared CO2 laser. The phase-matching angle and the grating period of periodically inverted GaAs in the 100-1000 µm (0.3-3 THz) range are also investigated on the basis of the surface-emitted difference frequency generation. It is found that two schemes of phase-matching-applied collinear phase matching and phase-matchingapplied non-collinear phase matching are efficient to obtain THz waves.

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Modelling half-cycle pulse generation in ZnGeP2 crystal

Cited by 5 publications

References 6 publications

Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Dynamics of polar polarizable rotors acted upon by unipolar electromagnetic pulses: From the sudden to the adiabatic regime

Two Schemes for Generating Efficient Terahertz Waves in Nonlinear Optical Crystals with a Mid-Infrared CO ₂ Laser

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Modelling half-cycle pulse generation in ZnGeP2 crystal

Cited by 5 publications

References 6 publications

Lattice dynamics and related properties of AIBIII and AIIBIV compounds, I. Elastic constants

Lattice dynamics and related properties of AIBIII and AIIBIV compounds, I. Elastic constants

Dynamics of polar polarizable rotors acted upon by unipolar electromagnetic pulses: From the sudden to the adiabatic regime

Two Schemes for Generating Efficient Terahertz Waves in Nonlinear Optical Crystals with a Mid-Infrared CO 2 Laser

Contact Info

Product

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Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Lattice dynamics and related properties of A^IB^III and A^IIB^IV compounds, I. Elastic constants

Two Schemes for Generating Efficient Terahertz Waves in Nonlinear Optical Crystals with a Mid-Infrared CO ₂ Laser