Pulse energy limitation of high-power nanosecond lasers due to plasma production in spatial filters

Kuzmin, A. D.; Хазанов, Е. А.; Shaykin, A. A.

doi:10.1070/qel17452

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Types of spatial filters vary greatly. The classical ones, even with modern improvements, such as slit [9][10][11] or pinhole 12,13 types are limited by the fact that they have an axis of symmetry, must be used with imaging lenses, and must be properly aligned. Passive spatial filters that do not require transverse alignment and allow for large diameter beams are based on volume Bragg gratings [14][15][16][17] and resonant structured gratings 18,19 .…”

Section: Introductionmentioning

confidence: 99%

MECSEL with dynamic transverse mode control

Gailevicius,

Kontenis,

Taranenko

et al. 2024

Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII

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The phenomenon of Laue diffraction is known in crystallography. Conceptually, its optics resemble coherent forward scattering by a periodic refractive index structure. It has been shown that compact and efficient spatial filters within short solid-state laser cavities can be made utilizing the Laue diffraction approach. While manufacturing spatial filters based on Laue diffraction proves to be comparatively simpler than those relying on Bragg diffraction, challenges persist due to the typically three-dimensional nature of these structures. To simplify the implementation of such spatial filters, we present a new approach. We propose a new type of spatial filter based on the complex refractive index, namely an amplification grating built into a relatively short surface-emitting laser cavity with a semiconductor membrane externalcavity surface-emitting laser. This represents a very special case where we achieve this goal by self-imaging inside the resonator, creating a virtual photonic crystal spatial filter that increases the brightness of the output laser beam. The simplicity and effectiveness of this approach are thoroughly validated in our paper.

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Section: Introductionmentioning

confidence: 99%

MECSEL with dynamic transverse mode control

Gailevicius,

Kontenis,

Taranenko

et al. 2024

Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII

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“…Consequently, direct measurement of intensity or fluence in the far field (i.e., in the focal * Author to whom any correspondence should be addressed. spot) requires either a sensor with a huge dynamic range [6] or complicated experiments with a perforated mirror [6,7]. Even if the intensity of the far-field noise spectrum is known, the beam fluence fluctuations, which are ultimately responsible for the optical breakdown, remain to be determined.…”

Section: Introductionmentioning

confidence: 99%

Self-filtering of beam fluence fluctuations at free space propagation

et al. 2023

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It is shown theoretically and experimentally that free space propagation in vacuum provides self-filtering of beam fluence fluctuations (spatial small-scale noise). The linear interference of the noise and the primary smooth beam during the propagation results in temporal filtering invoked by the noise pulse delay with respect to the primary beam pulse and in spatial filtering caused by the noise spatial walk-off from the aperture of the primary beam.

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“…Lightweight conditions and flexibility were applied to manufacture clothing for flight attendants. The fabrication of radiation shields involves the risk of pinholes, resulting in poor shielding performance (Kuzmin et al, 2021). To solve these problems, nanofiber-based shielding fibers must be fabricated.…”

mentioning

confidence: 99%

Functional lightweight protective clothing shielding design for constant radiation shielding of flight attendants and Monte Carlo simulation verification

Kim,

Youn

2023

Front. Mater.

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The use of easily accessible shielding suits for personal defense by flight attendants to reduce occupational cosmic radiation exposure is attracting increasing attention. However, to ensure activity in a limited area, the flexibility of the thin film must be considered. Although several process technologies to reduce the thickness of the shielding fabric are available, nanofiber production through electrospinning is the most effective, and it is attracting attention owing to its excellent reproducibility of the shielding performance. Therefore, in this study, a general sheet and a nanofiber shielding sheet were manufactured, and their shielding performance was compared. In addition, the shielding effect of the nanofiber shielding sheet was verified under aircraft conditions via Monte Carlo simulation. The shielding performance for neutrons and gamma rays, which are the most common sources of cosmic radiation, was 17.5% and 15.2%, respectively, with the Ba-133 and Cs-137 sources in the 0.3 mm shielding fabric. The absorbed dose change with the 5 mm shielding fabric was 7 μGy/d for neutrons and 4.3 μGy/d for protons. The shielding fabric developed in this study is expected to have an active shielding effect when used as personal protective equipment (clothing) by aircrew.

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Pulse energy limitation of high-power nanosecond lasers due to plasma production in spatial filters

Cited by 7 publications

References 19 publications

MECSEL with dynamic transverse mode control

MECSEL with dynamic transverse mode control

Self-filtering of beam fluence fluctuations at free space propagation

Functional lightweight protective clothing shielding design for constant radiation shielding of flight attendants and Monte Carlo simulation verification

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