Fabrication and replication of micro-optical structures for growth of GaN-based light emitting diodes

Gervinskas, Gediminas; Seniutinas, Gediminas; Anand, Vijayakumar; Bhattacharya, Subhashish; Jelmakas, Edgaras; Kadys, A.; Tomašiūnas, R.; Juodkazis, Saulius

doi:10.1117/12.2033709

Cited by 5 publications

(3 citation statements)

References 57 publications

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“…In most of the earlier studies on beam characteristics of axicon only a coherent illumination is considered [21][22][23]. In this study, the beam characteristics are investigated for a spatially incoherent illumination as it is easily available at a low cost and will be highly relevant to large scale and astronomical applications where large area devices are often required which in turn can be manufactured using femtosecond fabrication systems.…”

Section: Methodsmentioning

confidence: 99%

Imaging with diffractive axicons rapidly milled on sapphire by femtosecond laser ablation

Smith

Han

et al. 2021

Appl. Phys. B

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Fabrication of large area (sub-1 cm cross-section) micro-optical components in a short period of time (~10 min) and with lesser number of processing steps is highly desirable and cost-effective. In the recent years, femtosecond laser fabrication technology has revolutionized the field of manufacturing by offering the above capabilities. In this study, a fundamental diffractive optical element, binary axicon -axicon with two phase or amplitude levels, has been designed in three configurations namely conventional axicon, photon sieve axicon (PSA) and sparse PSA and directly milled onto a Sapphire substrate. The fabrication results revealed that a single pulse burst fabrication can produce a flatter and smoother profile than pulse overlapped fabrication which gives rise to surface damage and increased roughness.The fabricated elements were processed in IsoPropyl Alcohol and Potassium Hydroxide to remove debris and redeposited amorphous Sapphire. An incoherent illumination was used for optical testing of the components and a non-linear optical filter was used for cleaning the noisy images generated by the diffractive optical elements.

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Section: Methodsmentioning

confidence: 99%

Imaging with diffractive axicons rapidly milled on sapphire by femtosecond laser ablation

Smith

Han

et al. 2021

Appl. Phys. B

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“…The planes 2 and 3 are selected beyond the focal depth of the axicon with the plane 2 matching with the annular mirror plane and the plane 3 matching with the location of the Fresnel axicon [12,18]. The variation of intensity profile between the two planes shows the evolution of the ring pattern which is the characteristic of an axicon [13] as the conical phase expands. The angle introduced by the annular mirror is avoided in the simulation.…”

Section: Discussionmentioning

confidence: 99%

“…Combination of refractive and diffractive functions can be used for specific optical elements, e.g., the function of a conical lens (axicon) can be achieved by a Fresnel axicon [12] or a binary circular grating. The circular grating can convert a Gaussian beam or a uniform illumination into a Bessel-like beam [13]. The conversion of a Gaussian beam into a Bessel-like beam using a circular grating is shown in Fig.…”

Section: Making Optics Flat For Faster Laser Inscriptionmentioning

confidence: 99%

All femtosecond optical pump and X-ray probe: holey-axicon for free electron laser

Anand¹,

Maksimovic²,

Katkus³

et al. 2020

Preprint

Self Cite

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We put forward a co-axial pump(optical)-probe(X-rays) experimental concept and show performance of the optical component. A Bessel beam generator with a central 100 µm-diameter hole (on the optical axis) was fabricated using femtosecond (fs) laser structuring inside a silica plate. This flat-axicon optical element produces a needle-like axial intensity distribution which can be used for the optical pump pulse. The fs-X-ray free electron laser (X-FEL) beam of sub-1 µm diameter can be introduced through the central hole along the optical axis onto a target as a probe. Different realisations of optical pump are discussed. Such optical elements facilitate alignment of ultra-short fs-pulses in space and time and can be used in light-matter interaction experiments at extreme energy densities on the surface and in the volume of targets. Full advantage of ultra-short 10 fs X-FEL probe pulses with fs-pump(optical) opens an unexplored temporal dimension of phase transitions and the fastest laser-induced rates of material heating and quenching. A wider field of applications of fs-laser-enabled structuring of materials and design of specific optical elements for astrophotonics is presented.

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Surface and bulk structuring of materials by ripples with long and short laser pulses: Recent advances

Buividas

Mikutis

Juodkazis

2014

Progress in Quantum Electronics

279

158

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Fabrication and replication of micro-optical structures for growth of GaN-based light emitting diodes

Cited by 5 publications

References 57 publications

Imaging with diffractive axicons rapidly milled on sapphire by femtosecond laser ablation

Imaging with diffractive axicons rapidly milled on sapphire by femtosecond laser ablation

All femtosecond optical pump and X-ray probe: holey-axicon for free electron laser

Surface and bulk structuring of materials by ripples with long and short laser pulses: Recent advances

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