Photonic crystal spatial filtering in broad aperture diode laser

Gawali, Sandeep Babu; Gailevičius, Darius; Garre-Werner, Guillermo; Purlys, Vytautas; Cojocaru, C.; Trull, J.; Montiel-Ponsoda, J.; Staliūnas, Kęstutis

doi:10.1063/1.5113780

Cited by 23 publications

(18 citation statements)

References 22 publications

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“…For instance, 15 periods (30 layers) of modulation result in layered coatings of approximately 10 λ thickness, which, for the near IR, considering the refractive index of the material, is around 5 μm. This is a significant advantage of our filtering principle compared with the spatial filters in Laue configuration, [ 3,4,8,9 ] where the thickness of the spatial filter is of the order of 1 mm. Moreover, in Laue forward refraction configuration no “true” BGs are possible—just the quasi‐BGs appear, as the refraction is directed predominantly in the forward direction.…”

Section: Designmentioning

confidence: 99%

“…Combining all these ingredients into one compact optical element is an unresolved challenge. Some attempts to fabricate spatial filters were made by direct laser writing in glasses, [6,7] and although they even were successfully integrated into microlasers, [8,9] they did not lead to spectacular improvement of the spatial structures of the radiation (the brightness increased 3 times in microchip lasers, [8] and 1.5 times in edge-emitting lasers [9] ).…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Multilayer Coatings for Spatial Filtering

Grinevičiūtė

Babayigit

Gailevičius

et al. 2021

Advanced Optical Materials

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Spatial filtering is an important mechanism to improve the spatial quality of laser beams. Typically, a confocal arrangement of lenses with a diaphragm in the focal plane is used for intracavity spatial filtering. Such conventional filtering requires access to the far‐field domain. In microlasers, however, conventional filtering is impossible due to the lack of space in microresonators to access the far‐field. Therefore, a novel concept for more compact and efficient spatial filtering is necessary. In this study, a conceptually novel mechanism of spatial filtering in the near‐field domain is proposed and demonstrated, by a nanostructured multilayer coating—a 2D photonic crystal structure with a periodic index modulation along the longitudinal and transverse directions to the beam propagation. The structure is built on a nanomodulated substrate, to provide the transverse periodicity. The physical vapor deposition is used to provide self‐repeating modulation in the longitudinal direction. A 5 µm thick photonic multilayer structure composed of nanostructured multiple layers of alternating high‐ and low‐index materials providing spatial filtering in the near‐infrared frequencies with 2° low angle passband is experimentally demonstrated. The proposed photonic structure can be considered as an ideal component for intracavity spatial filtering in microlasers.

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Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured Multilayer Coatings for Spatial Filtering

Grinevičiūtė

Babayigit

Gailevičius

et al. 2021

Advanced Optical Materials

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“…It may result in modifications of the angular spectrum and sorting incident waves. Various performances of spatial filters are known, which are based on interference patterns [65], anisotropic (indefinite) [66], hyperbolic [67] and epsilon-near-zero [68] media, resonant gratings [29,69,70], and photonic crystals [28,61,[71][72][73].…”

Section: Functionalities Enabled By Deflectionmentioning

confidence: 99%

A simple Mie-resonator based meta-array with diverse deflection scenarios enabling multifunctional operation at near-infrared

et al. 2020

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Deflection, a basic functionality of wavefront manipulation is usually associated with the phase-gradient metasurfaces and the classical blazed gratings. We numerically and experimentally demonstrate an unusually wideband and simultaneously wide-angle deflection achieved at near-infrared in reflection mode for a periodic (nongradient), ultrathin meta-array comprising only one silicon nanorod (Mie resonator) per period. It occurs in the range where only the first negative diffraction order and zero order may propagate. Deflection serves as the enabler for multifunctional operation. Being designed with the main goal to obtain ultra-wideband and wide-angle deflection, the proposed meta-array is also capable in spatial filtering and wide-angle splitting. Spatial filtering of various types can be obtained in one structure by exploiting either deflection in nonzero diffraction orders, or the specular-reflection (zero-order) regime. Thus, the role of different diffraction orders is clarified. Moreover, on–off switching of deflection and related functionalities is possible by changing polarization state of the incident wave. The suggested device is simple to fabricate and only requires cost-effective materials, so it is particularly appropriate for the large-area fabrication using nanoprint lithography. Ultra-wideband wide-angle and other deflection scenarios, along with the other functionalities, are promising for applications in optical communications, laser optics, sensing, detection, and imaging.

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“…The action of the PhC in the near-field area of extended resonator is thus equivalent to its action in the monolithic configuration inside the laser microcavity. In a previous study, the first proof of spatial filtering in edge-emitting lasers using an intracavity PhC was provided [14].…”

Section: Introductionmentioning

confidence: 99%

Spatial filtering in edge-emitting lasers by intracavity chirped photonic crystals

et al. 2020

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In this work, we report an experimental and numerical study of the intracavity spatial filtering in edge-emitting lasers using a chirped photonic crystal (PhC) as the filtering element in the near-field domain. We provide a comprehensive analysis of the near-field PhC filtering scheme and compare it to conventional spatial filtering using a variable width slit in the far-field domain. Using a two-dimensional chirped PhC as a spatial filter, we experimentally demonstrate a brightness enhancement by a factor of 1.3, considering an edge-emitting laser with a 1.5 mm cavity length, consistent with a numerical prediction of brightness enhanced by a factor of 1.7. The experimental results are theoretically confirmed by numerical integration of a spatio-temporal model of the edge-emitting laser. Furthermore, numerical results show that brightness can be further increased over a factor of 2, applying optimized spatial-filtering elements at both the front and rear facets of the lasers.

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Photonic crystal spatial filtering in broad aperture diode laser

Cited by 23 publications

References 22 publications

Nanostructured Multilayer Coatings for Spatial Filtering

Nanostructured Multilayer Coatings for Spatial Filtering

A simple Mie-resonator based meta-array with diverse deflection scenarios enabling multifunctional operation at near-infrared

Spatial filtering in edge-emitting lasers by intracavity chirped photonic crystals

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