Super-collimation by axisymmetric diffractive metamirror

Lymarenko, Ruslan A.; Gailevičius, Darius; Meskelaite, I.; Grinevičiūtė, Lina; Peckus, M.; Staliūnas, Kęstutis; Taranenko, V. B.

doi:10.1364/ol.424033

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…In case of Q = 1 it would result in a zero-incidence-angle stop filter. Also, Q can be near a multiple integer value; the effect should still be observable but not as efficiently 38 .…”

Section: Resultsmentioning

confidence: 99%

“…Other structures of interest are based on the geometry of concentric filters, producing insights that a multilayer structure is unnecessary. This is valid for the super-collimation effect 36,37 , where the effect can be reproduced only with a single grating and a mirror, comprising a virtual 3D structure 38 . The only requirement is that the interlayer spacing, or the optical roundtrip path between the grating and a mirror is only slightly detuned from the Talbot self-imaging distance 39 .…”

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

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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“…In case of Q = 1 it would result in a zero-incidence-angle stop filter. Also, Q can be near a multiple integer value; the effect should still be observable but not as efficiently 38 .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

MECSEL with dynamic transverse mode control

Gailevicius,

Kontenis,

Taranenko

et al. 2024

Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII

View full text Add to dashboard Cite

show abstract

“…The idea of spatial filtering in reflection has been suggested in 23 and experimentally demonstrated; 24 however the angular sensitivity was relatively weak. The 23,24 studies rely on the Photonic Crystal (PhC) positioned in front of the plane mirror, while PhC itself was fabricated by direct laser writing lithography in a glass media. An advance in efficiency was achieved recently in, 25 where the Fano-like resonances in nanostructured thin films enabled a strong reflection sensitivity to the angle of incidence (AOI).…”

Section: Fano-structurementioning

confidence: 99%

Fano-structure as output coupling mirror of microchip laser doubles its brightness

Plukys,

Gailevicius,

Grineviciute

et al. 2024

Semiconductor Lasers and Laser Dynamics XI

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The compactization of lasers is an ongoing challenge in increasing their effectiveness and integrability of other systems, from nanosatellites to medical devices. The need to decrease their dimensions, especially, for diodepumped solid-state microchip laser systems causes significant problems with beam quality. Such lasers feature an additional problem of Brightness to output power scaling power. We report an approach where we used a thin film dielectric Fano-like resonance structure as a replacement to a conventional output coupler to overcome this challenge. The structure is engineered to function as a flat spatial filter element for selecting the fundamental transverse mode of the cavity. We achieved an increase of 2x over a conventional setup in CW operation. The data matches well with the numerical analysis performed for a single longitudinal mode model. We predict that this discovery could lead to advanced power scaling in submillimeter cavities, while maintaining the beam quality.

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Improvement of Thermochemical Processes of Laser-Matter Interaction and Optical Systems for Wavefront Shaping

Murzin

2022

Applied Sciences

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Laser thermochemical processes of metal surface oxidation are promising for creating new advanced technologies to meet the growing needs of opto- and micro-electronics, photonics, catalysis, sensorics and other high-tech industries. The features of thermochemical processes of laser-matter interaction occurring in matter under exposure to intense light flows and optical systems for controlling the irradiance and wavefront spatial distribution were reviewed. The laser beam offers the possibility of good focusing, which allows us to conduct chemical reactions, including the heterogeneous oxidation of metals, locally, with high spatial resolution. In this case, the absorption mechanisms of the laser beam vary for metals and for oxides, resulting from a thermochemical reaction and represent semiconductors. For semiconductors, the intrinsic, intraband, impurity, or lattice absorption takes place. The morphology of a metal surface also influences its optical absorption capacity. The improvement of beam shaping systems with elements of computer optics, namely diffractive freeform optics, provides an opportunity for an efficient control of chemical processes by achieving the desired redistribution of the laser beam power density. Laser thermochemical processes of the formation of quasi-one-dimensional nanostructured metal oxides are of great interest for advanced research and for a wide range of applications. A special feature of these processes is that, in the case of a frequency-modulated laser beam the synergy between the heat associated effects of the laser pulses and the laser-induced vibrations allows for a significant increase in the diffusion coefficient, which is stimulated by the non-stationary stress-strain state of the material. Ensuring the means of control over the thermochemical reaction in local sections of the laser exposure zone is an issue that can be solved by adapting the shape of the laser beam by the diffractive freeform optics. The gained knowledge contributes as a foundation for new photonic technologies oriented on the formation of nanostructured metal oxides, involving control over the morphology of the synthesized structures.

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Super-collimation by axisymmetric diffractive metamirror

Cited by 3 publications

References 27 publications

MECSEL with dynamic transverse mode control

MECSEL with dynamic transverse mode control

Fano-structure as output coupling mirror of microchip laser doubles its brightness

Improvement of Thermochemical Processes of Laser-Matter Interaction and Optical Systems for Wavefront Shaping

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