36 citations · 108 across the 19 of their papers we have counts for
20 papers
A Helical-Deflector-Based Radio-Frequency Spiral Scanning System for keV Energy Electrons
Simon Zhamkochyan, Vanik Kakoyan, Vardan Bardakhchyan +21
We present the design, modeling, and experimental validation of a radio-frequency based time-to-position conversion system for keV electrons incorporating a helical deflector opera…
Magnetically Induced Transparency-Absorption and Normal-Anomalous Dispersion Characteristics of Medium or Any J-Type Configuration Atomic Vapors Subject to a Vector Magnetic Field and a Weak Resonant Pump
Hayk L. Gevorgyan
We have developed an analytical framework for magnetically induced transparency-absorption (MITA) and normal-anomalous dispersion (MINAD) in a weakly driven vapo…
A Capacitor Model of the Helical Deflector: Revisiting Shamaev's Proposal and the Textbook Model
Hayk Lekdar Gevorgyan
An RF helical deflector is a type of electron and ion optics device that applies a time-dependent rotating transverse electric or magnetic field by means of time-dependent RF volta…
Arbitrary polarization retarders and polarization controllers, constructed from sequences of half-wave and quarter-wave plates
Hayk L. Gevorgyan, Andon A. Rangelov
We theoretically introduce several types of arbitrary polarization retarders constructed from sequences of half-wave and quarter-wave plates, each rotated at specific angles. By in…
FEL Gain Enhancement in an Optical Klystron
Anahit H. Shamamian, Hayk L. Gevorgyan, Lekdar A. Gevorgian
A system comprising two identical helical or planar undulators separated by a gap -- viz., an optical klystron (OK) -- is investigated. A formula for the frequency distribution of…
Line shape of soft photon radiation generated at zero angle in an undulator with a dispersive medium
Hayk L. Gevorgyan, Koryun L. Gevorgyan, Anahit H. Shamamian +1
The problem of undulator radiation from a bunch of charged particles, taking into account a medium polarization, is considered. In a dispersive medium, at a zero angle, in addition…
Narrowband and passband composite rotational quantum gates
Hayk L. Gevorgyan
High-precision, robust quantum gates are essential components in quantum computation and information processing. In this study, we present an alternative perspective, exploring the…
Partially Coherent X-Ray Oscilex Radiation from a FEL-Modulated Positron Bunch during Its Planar Channeling in a Crystalline Undulator
Hayk L. Gevorgyan, Lekdar A. Gevorgian
The radiation emitted at zero angle by a microbunched positron bunch undergoing planar channeling in a crystalline undulator (CU) is studied. The bunch energy is assumed to be far…
Dielectric permittivity of electron plasma with laser beat waves
Anahit H. Shamamian, Lekdar A. Gevorgian, Hayk L. Gevorgyan
Within the framework of the kinetic method, the process of interaction of a rarefied electron plasma with laser beat waves is investigated taking into account the initial spread in…
Ultrabroadband, ultranarrowband and ultrapassband composite polarisation half-wave plates, ultrabroadband composite polarisation pi-rotators and on the quantum-classical analogy
Hayk L. Gevorgyan
Composite pulses, which produce ultrabroadband, ultranarrowband and ultrapassband -, -) rotations by on the Bloch-Poincaré sphere, are presented. The first class plays…
Deterministic generation of arbitrary ultrasmall excitation of quantum systems by composite pulse sequences
Hayk L. Gevorgyan, Nikolay V. Vitanov
In some applications of quantum control, it is necessary to produce very weak excitation of a quantum system. Such an example is presented by the concept of single-photon generatio…
Ultrahigh-fidelity composite quantum phase gates
Hayk L. Gevorgyan, Nikolay V. Vitanov
A number of composite pulse (CP) sequences for four basic quantum phase gates -- the Z, S, T and general phase gates -- are presented. The CP sequences contain up to 18 pulses and…
Broadband composite nonreciprocal polarization wave plates and optical isolators
Hayk L. Gevorgyan, Andon A. Rangelov, Nikolay V. Vitanov
We provide a technique for a broadband nonreciprocal wave retarder whose quarter-wave plate phase retardation is the same in forward and backward directions. The system is built us…
Ultrahigh-fidelity composite rotational quantum gates
Hayk Gevorgyan, Nikolay V. Vitanov
Composite pulse sequences, which produce arbitrary pre-defined rotations of a qubit on the Bloch sphere, are presented. The composite sequences contain up to 17 pulses and can comp…
Optical Isolation with Microring Modulators
Nathan Dostart, Hayk Gevorgyan, Deniz Onural +1
Optical isolators, while commonplace in bulk- and fiber-optic systems, remain a key missing component in integrated photonic systems. Isolation using magneto-optic effects has been…
Active-cavity photonic molecule optical data wavelength converter for silicon photonics platforms
Hayk Gevorgyan, Anatol Khilo, Miloš A. Popović
We demonstrate an optical data wavelength converter based on an electrically driven photonic molecule structure comprising two coupled active silicon microring resonators. The conv…
Triply-resonant coupled-cavity electro-optic modulators for on-chip RF photonic systems
Hayk Gevorgyan, Anatol Khilo, Yossef Ehrlichman +1
We propose a triply-resonant electro-optic modulator architecture which maximizes modulation efficiency using simultaneous resonant enhancement of the RF drive signal, the optical…
Tunable Optical Radiation Formed in Crystalline Undulator
Hayk Gevorgyan
The problem of optical radiation produced by a bunch of relativistic positrons channeled to a crystalline undulator (CU) is considered. Taking into account the polarization of the…
Coherent radiation of microbunched beam in stack of two plates
Hayk Gevorgyan, Lekdar Gevorgyan, Karo Ispiryan
The present article is devoted to the radiation from an electron bunch with modulated density passes through the stack consisting of two plates with different thicknesses and elect…
Positron Bunch Radiation in the System of Tightly Packed Nanotubes
Hayk L. Gevorgyan, Koryun L. Gevorgyan, Lekdar A. Gevorgian
Radiation emitted by a bunch of positrons channeled in nanotubes at zero emission angle is studied taking into account medium polarization. The formation of radiation is characteri…