Contents

Bulletin of the Russian Academy of Sciences: Physics

Vol. 89, No. 1, 2025

Optical Pulses in a Non-Hermitian Medium near a Singularity

V. A. Bushuev, and B. I. Mantsyzov p. 1  abstract

Optical Computation of the Laplace Operator at Normal Incidence Using a Multilayer Metal–Dielectric Structure

A. I. Kashapov, E. A. Bezus, D. A. Bykov, and L. L. Doskolovich p. 7  abstract

Radioelectric Effect in a Superlattice Based on a 3D Dirac Crystal

A. V. Valkov, S. V. Kryuchkov, and E. I. Kukhar p. 11  abstract

Plasma Waves in a Two-Dimensional Superlattice under the Influence of a Nonlinear Electromagnetic Wave

I. A. Agapova, S. Yu. Glazov, and S. V. Kryuchkov p. 16  abstract

Transformation of Selective Characteristics of Electrically Controlled Chirped Multilayer Inhomogeneous Diffraction Structures Based on Photopolymerizing Composites with Nematic Liquid Crystals

S. N. Sharangovich, V. O. Dolgirev, and D. S. Rastrygin p. 21  abstract

Superluminal Objects in Non-Equilibrium Media

S. V. Sazonov p. 27  abstract

Propagation of Fractal Speckles in Optical Systems and in Free Space

R. T. Kubanov, A. M. Zotov, P. V. Korolenko, and A. Yu. Mishin p. 32  abstract

Laser-Driven Formation of Relativistic Electron Mirrors and Generation of Incoherent X-Rays

V. V. Kulagin, V. N. Kornienko, and V. A. Cherepenin p. 37  abstract

Quantum Features of Waves in the Parametric Down Conversion of Light

I. A. Tereshchenko, and O. V. Tikhonova p. 44  abstract

Differential Gain of THz Radiation in Crystalline Quartz in the Field of Pump Wave

I. I. Kazakov, M. S. Guselnikov, and S. A. Kozlov p. 50  abstract

(2 + 1)D Soliton Pairs in a Planar Quadratic Nonlinear Crystal with Inhomogeneity

B. S. Bryantsev, and A. A. Kalinovich p. 56  abstract

Microcavities and Photonic Time Crystals Formed by the Colliding of Half-Cycle Light Pulses in a Resonant Medium

R. M. Arkhipov, M. V. Arkhipov, A. V. Pakhomov, O. O. Diachkova, and N. N. Rosanov p. 63  abstract

Dynamics of the Parameters of Pulses Propagating in a Medium with Anomalous Group Velocity Dispersion

V. A. Khalyapin, and A. N. Bugay p. 71  abstract

Application of Microwave Photonic Methods in the Design of Microwave Receiving Devices for the Formation and Registration of Radio Holograms

D. Burkitbaev, V. V. Kulagin, R. V. Ryzhuk, V. V. Valuev, and V. A. Cherepenin p. 75  abstract

Generating Sub-Terahertz Chaotic Radiation in a High-Current Relativistic Gyrotron in the Mode of Frequency Multiplication

N. S. Ginzburg, I. V. Zotova, A. N. Leontyev, A. M. Malkin, R. M. Rozental, and A. S. Sergeev p. 80  abstract

Effect of 2D Processes on the Bunching of Intense Electron Beams in Broadband Klystrons

V. E. Rodyakin, and V. N. Aksenov p. 85  abstract

The Transformation of a Flat Front of a Unipolar Radiation Pulse into a Cylindrical One

V. N. Kornienko, and V. V. Kulagin p. 92  abstract

Topological Laws of the Rayleigh Wave Meta-Rayleigh Scattering on Deterministic Three-Dimensional Roughness

V. N. Chukov p. 96  abstract

Reconstructing the Spatial Distribution of Acoustic Characteristics Using the Angular Harmonic Technique

D. I. Zotov, O. D. Rumyantseva, and A. S. Cherniaev p. 109  abstract

Mean Fields of Acoustic Waves with Discontinuities in Randomly Inhomogeneous Media

D. M. Alekseev, and V. A. Gusev p. 115  abstract

Modifying the van der Waals Equation to Describe the Thermodynamic Properties of Liquid Water

A. A. Volkov, and S. V. Chuchupal p. 122  abstract

Some Characteristics of Nonlinear Potential Surface Waves in an Ideal Fluid

A. A. Ochirov, and K. Yu. Lapshina p. 131  abstract

Simulation of the Excitation of Spin Waves by the Effect of an Electric Field on Domain Walls in Magnetic Films with Inhomogeneous Magnetoelectric Interaction

N. V. Myasnikov, and A. P. Pyatakov p. 138  abstract

Calculations for a Relativistic Gyrotron in the Range of 300 GHz, Allowing for the True Shape of the Accelerating Voltage Pulse

A. N. Leontyev, R. M. Rozental, O. P. Plankin, and E. S. Semenov p. 147  abstract

Application of Pulsed Acoustic Microscopy for Studying Chitosan-Based Biocomposite Sponges

Y. S. Petronyuk, E. A. Khramtsova, K. G. Antipova, S. G. Vasilieva, A. N. Bogachenkov, A. E. Solovchenko, and T. E. Grigoriev p. 152  abstract

The Numerical Study of a Surface-Wave Tomography Scheme for the Reconstruction of Three-Dimensional Inhomogeneities

D. D. Pozdnyakova, D. A. Presnov, and A. S. Shurup p. 158  abstract

Retraction Note

Retraction Note: SERS-Based Rapid Detection of Botulinum Toxin A Using an Aptasensor

O. A. Ambartsumyan, and A. M. Brovko p. 165  abstract