Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Ezhov, Dmitry M.; Turgeneva, Snezhana; Nikolaev, Nazar; Mamrashev, A. A.; Mikerin, S. L.; Minakov, Fedor; Simanchuk, A. E.; Анцыгин, В. Д.; Svetlichnyi, V. A.; Лосев, В. Ф.; Andreev, Yu. A.

doi:10.3390/cryst11111321

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…It can be diagonalized to give n x = 2.39, n y = 2.67, n z = 3.57, which may be compared with the measured refractive indices of n x = 2.4, n y = 2.6 and n z = 3.9 at RT [64] or n x = 2.37, n y = 2.71 and n z = 3.75 at 77 K [65] in the THz range (at around 0.2 THz, well below the lowest vibration frequencies ~4.2 THz and well above the piezoelectric resonances~several MHz of the BiBO crystal samples).…”

Section: Vibration Modes and Their Contributions To The Dielectric Eo...mentioning

confidence: 99%

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal

2024

ChemPhysChem

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a‐BiB3O6 (BiBO) is an important nonlinear optical (NLO) material with high efficiency for applications in harmonic generations and quantum technology. Owing to its low symmetry and cooperative Bi3+ lone pair arrangement, it has also exceptional large piezoelectric and electro‐optic coefficients and strong anisotropies on other material characteristics. Previous theoretical calculations on its physical properties often gave confusing results. It is found here that London dispersion (LD) tends to stabilize structures with closer pack Bi3+ with large polarizabilities, which is ignored in most previous density functional theory (DFT) calculations. Present study shows that without considering the LD effect, the structure of a‐BiB3O6 (BiBO) was predicted with an over‐estimated (by over 10%) unique b‐axis while underestimates a and overestimates c in a less amount. Consequently it is not possible to use the calculated structure to obtain meaningful properties of this important material. By applying a modified post‐DFT LD correction, the experimental structure is well reproduced with the theoretical optimized one. Important material property tensors of BiBO crystal are calculated in unprecedented precisions, including: dielectric constants (static and in THz range), elastic and elasto‐optic constants, piezoelectric constants, refractive indices, NLO and electro‐optic (EO) coefficients.

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Section: Vibration Modes and Their Contributions To The Dielectric Eo...mentioning

confidence: 99%

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal

2024

ChemPhysChem

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“…The key to the advancement of terahertz technology is the availability of low-cost and compact terahertz sources. Difference frequency generation is a relatively mature technique for producing terahertz band output [12][13][14]. VECSELs have unique advantages, such as broad wavelength range, fine wavelength tuning, and a flexible external cavity structure, making them very suitable for difference frequency generation of terahertz sources [15].…”

Section: Introductionmentioning

confidence: 99%

Single-Chip Switchable Dual-Wavelength Vertical External-Cavity Surface-Emitting Laser

Zhang,

et al. 2023

Crystals

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Dual-wavelength output devices have a wide range of applications in mid-infrared band difference frequency generation, anti-interference lidar, dual-wavelength holographic interferometry, and other applications. Vertical external cavity surface-emitting lasers (VECSELs) are a type of semiconductor laser that can achieve single-chip dual-wavelength output by designing the chip structure. In this paper, we present a single-chip VECSEL that can switch between dual-wavelength and single-wavelength output modes. The VECSEL can simultaneously emit coaxial laser beams at 967 nm and 1013 nm, with a wavelength spacing of about 45 nm. The degree of mismatch between the gain peaks of the two quantum wells in the gain chip and the corresponding cavity modes is different. By adjusting the pump power, the temperature of the active region can be changed, which alters the matching relationship between the gain peaks and the cavity modes and controls the output mode of the VECSEL. The dual-wavelength output mode maintains a stable wavelength spacing at different operating temperatures. The laser output mode can be switched between single-wavelength and dual-wavelength, and the beam divergence angle is less than 8°. The dual-wavelength output power can exceed 400 mW, and the long-wavelength output power can reach up to 700 mW.

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“…The research interest in the superionic conductor lithium tetraborate (Li 2 B 4 O 7 ) is determined by its broad prospects for use in nonlinear optical and piezoelectric devices. Lithium tetraborate is a promising nonlinear material for laser frequency conversion, including for generating the fourth and fifth harmonics of Nd:YAG lasers [1] and sub-terahertz radiation [2]. In addition, following Sahil et al [3] and Mehrabi et al [4], Li 2 B 4 O 7 crystals (doped with various impurities) have wide application possibilities in radiation dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Elastic-plastic properties of Li2B4O7 determined by nanoindentation

Chobal,

Myslo

et al. 2023

Scientific Herald of Uzhhorod University Series Physics

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Relevance. Crystalline and amorphous lithium tetraborate (Li2B4O7) has a wide range of practical applications due to its physical properties. The knowledge of the mechanical characteristics of the surface layers of these materials, which are studied by nanoindentation, is necessary for optimising the technological processes for obtaining “optically perfect” samples. Aim. A comparative study of the mechanical properties and deformation mechanisms of glassy and crystalline Li2B4O7 samples in a wide range of applied loads. Methodology. The elastic-plastic properties of crystalline and glassy lithium tetraborate were investigated using the multiple-loading cyclic nanoindentation method. The samples were measured at maximum loading forces of 50, 100, 150, 200, 250, 300, 350, 400, 450, and 500 mN. Four measurements (in the form of a 2x2 matrix) were made at a distance of 50 µm from each other on each sample and at each load. Young’s modulus, hardness, and Poisson’s ratio of Li2B4O7 glass were also calculated using the Makishima-Mackenzie theory. Results. The load-displacement curves and graphs of the dependence of the average contact pressure on the displacement of the diamond Berkovich indenter were obtained, which have a “smooth” shape and no anomalies associated with “pop-in” or “pop-out” effects. The indentation modulus (Young’s modulus E) and hardness H of the studied samples were obtained from the experimental P-h load-displacement diagrams. The measured values mainly depend on the applied load or the contact depth of the indenter penetration into the crystalline and vitreous lithium tetraborate. Conclusions. Both the hardness and Young’s modulus of Li2B4O7 glass are lower than those of the single crystal, indicating a lower resistance of amorphous lithium tetraborate to elastic and plastic deformations. The obtained experimental values of hardness and Young’s modulus of Li2B4O7 glass correlate well with the results of the calculation within the framework of the Makishima-Mackenzie theory. Multiple-loading cyclic nanoindentation leads to deformation densification of glassy Li2B4O7 due to changes in the angles and lengths of chemical bonds, which leads to a decrease in the free volume in the medium-order structure of glass, as well as a change in the coordination of Boron atoms relative to Oxygen, i.e., the transformation of three-coordinated Boron into four-coordinated Boron

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Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Cited by 3 publications

References 33 publications

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal

Single-Chip Switchable Dual-Wavelength Vertical External-Cavity Surface-Emitting Laser

Elastic-plastic properties of Li2B4O7 determined by nanoindentation

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Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Cited by 3 publications

References 33 publications

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB3O6 Crystal

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB3O6 Crystal

Single-Chip Switchable Dual-Wavelength Vertical External-Cavity Surface-Emitting Laser

Elastic-plastic properties of Li2B4O7 determined by nanoindentation

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Product

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London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal

London Dispersion Effects on the Structure and Properties of Nonlinear Optical BiB₃O₆ Crystal