scholarly journals Эффекты магнитного поля в экситонной генерации оптических гармоник

2020 ◽  
Vol 62 (9) ◽  
pp. 1459
Author(s):  
В.В. Павлов
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Harmonic Generation ◽  
Stark Effect ◽  
Second Harmonic ◽  
Wide Bandgap ◽  
Third Harmonic ◽  
Wide Bandgap Semiconductor ◽  
Conduction Bands ◽  
Resonance Magnetic Field

Mechanisms responsible for the optical harmonics generation in several classes of materials at excitonic transitions are considered. In the cubic semiconductor GaAs, magnetically induced second harmonic generation (SHG) was observed in the region of orbital quantization for the valence and conduction bands. An unusually strong third harmonic generation was detected in the region of the 1s exciton in an external magnetic field due to the exciton-polariton resonance. Magnetic field induced SHG was revealed in the hexagonal wide bandgap semiconductor ZnO at exciton resonances 1s, 2s, and 2p. Depending on the symmetry of the exciton states, the SHG mechanisms are determined by the spin and orbital Zeeman effects, and the magneto-Stark effect. Magnetically induced contribution to SHG was studied in the antiferromagnet Cr2O3 at exciton transitions in an external magnetic field.

scholarly journals Effects of an External Magnetic Field on the Interband and Intraband Optical Properties of an Asymmetric Biconvex Lens-Shaped Quantum Dot

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 60
Author(s):  
Mher A. Mkrtchyan ◽  
David B. Hayrapetyan ◽  
Eduard M. Kazaryan ◽  
Hayk A. Sarkisyan ◽  
Maxim Ya. Vinnichenko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
External Magnetic Field ◽  
Quantum Dot ◽  
Harmonic Generation ◽  
Third Harmonic Generation ◽  
Photoluminescence Spectra ◽  
Third Harmonic ◽  
Different Temperatures ◽  
Linear And Nonlinear

The theoretical investigation of interband and intraband transitions in an asymmetric biconvex lens-shaped quantum dot are considered in the presence of an external magnetic field. The selection rules for intraband transitions are obtained. The behaviors of linear and nonlinear absorption and photoluminescence spectra are observed for different temperatures and magnetic field strengths. The second and third harmonic generation coefficients as a function of the photon energy are examined both in the absence and presence of an external magnetic field.

SECOND-HARMONIC GENERATION OF THE SURFACE MAGNETOPLASMON ON THE LATERAL SURFACE OF THE SEMICONDUCTOR SUPERLATTICE BOUNDED BY A METAL

1995 ◽  
Vol 02 (05) ◽  
pp. 579-585 ◽  
Author(s):  
N.A. AZARENKOV ◽  
I.B. DENISENKO ◽  
K.N. OSTRIKOV
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Lateral Surface ◽  
Second Harmonic ◽  
Dielectric Tensor ◽  
Generation Process ◽  
Two Dimensional ◽  
Semiconductor Superlattice

The resonant second-harmonic generation process of the surface magnetoplasma wave (SM) propagating across an external magnetic field on the lateral surface of the semiconductor superlattice bounded by a metal is studied. The lateral surface is perpendicular to the layers of the periodic structure and is parallel to the directions of the superlattice axis and the external magnetic field. The latter is assumed to quantize the electrodynamical properties of two-dimensional conducting layers of the semiconductor superlattice. The consideration is carried out in the approximation of the continuous anisotropic medium characterized by an effective dielectric tensor of the superlattice. The numerical estimates showing the efficiency of the second-harmonic generation are carried out for superlattices on the base of GaAs-AlGaAs heterostructures.

Giant Magnetic Field Induced Effects in the Second-Harmonic Generation in a Planar Anisotropic Ta/Co/Pt Structure

JETP Letters ◽  
2020 ◽  
Vol 111 (6) ◽  
pp. 333-337
Author(s):  
T. V. Murzina ◽  
I. A. Kolmychek ◽  
N. S. Gusev ◽  
A. I. Maidykovskii
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic

High-power ultrafast thin-disk multipass amplifiers for efficient laser-based manufacturing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Marwan Abdou Ahmed ◽  
Christoph Roecker ◽  
André Loescher ◽  
Florian Bienert ◽  
Daniel Holder ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
State Of The Art ◽  
Second Harmonic ◽  
Average Power ◽  
Polycrystalline Diamond ◽  
Third Harmonic Generation ◽  
Thin Disk ◽  
Ultrafast Laser ◽  
Third Harmonic ◽  
Laser Systems

Abstract Thin-disk multipass amplifiers represent one of the most powerful approaches to scale the average and peak powers of ultrafast laser systems. The present paper presents the amplification of picosecond and femtosecond pulses to average powers exceeding 2 and 1 kW, respectively. Second-harmonic generation in lithium-triborate crystals with powers higher than 1.4 kW and 400 W at a wavelength of 515 nm with picosecond and femtosecond pulse durations, respectively, are also reported. Furthermore, third-harmonic generation was demonstrated with output powers exceeding 250 W at a wavelength of 343 nm. Finally, processing of silicon, metals, and polycrystalline diamond with fs pulses at an average power of 1 kW is presented to demonstrate removal rates that are improved by orders of magnitude as compared to state-of-the-art techniques.

NONLINEAR MAGNETO-OPTICAL EFFECT IN VACUUM: INHOMOGENEITY-ORIGINATED SECOND-HARMONIC GENERATION IN DC MAGNETIC FIELD

1992 ◽  
Vol 01 (01) ◽  
pp. 51-72 ◽  
Author(s):  
Y.J. DING ◽  
A.E. KAPLAN
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Second Harmonic ◽  
Intense Laser ◽  
Gaussian Laser Beam ◽  
Optical Wave ◽  
Dc Magnetic Field ◽  
Magneto Optical Effect

The photon-photon scattering predicted by quantum electrodynamics can give rise to second-harmonic generation of intense laser radiation in a dc magnetic field due to broken symmetry of interaction even in the “box” diagram approximation. This effect is possible only when the field system (i.e. optical wave+dc field) is inhomogeneous, in particular when a Gaussian laser beam (i.e. nonplane wave) propagates in either homogeneous or inhomogeneous dc magnetic field.

scholarly journals Multiphoton Microscopy for Ophthalmic Imaging

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Emily A. Gibson ◽  
Omid Masihzadeh ◽  
Tim C. Lei ◽  
David A. Ammar ◽  
Malik Y. Kahook
Keyword(s):  
Harmonic Generation ◽  
Second Harmonic ◽  
Imaging Techniques ◽  
Multiphoton Microscopy ◽  
Tissue Imaging ◽  
Third Harmonic ◽  
Two Photon ◽  
Disease Mechanisms ◽  
Ophthalmic Imaging ◽  
Anti Stokes

We review multiphoton microscopy (MPM) including two-photon autofluorescence (2PAF), second harmonic generation (SHG), third harmonic generation (THG), fluorescence lifetime (FLIM), and coherent anti-Stokes Raman Scattering (CARS) with relevance to clinical applications in ophthalmology. The different imaging modalities are discussed highlighting the particular strength that each has for functional tissue imaging. MPM is compared with current clinical ophthalmological imaging techniques such as reflectance confocal microscopy, optical coherence tomography, and fluorescence imaging. In addition, we discuss the future prospects for MPM in disease detection and clinical monitoring of disease progression, understanding fundamental disease mechanisms, and real-time monitoring of drug delivery.

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