Photosensitivity of barium germano-gallate glasses under femtosecond laser direct writing for Mid-IR applications

Yao, Han; Zaiter, Rayan; Cavillon, Maxime; Sapaly, Benjamin; Calzavara, Florian; Delullier, Pierre; Cardinal, Thierry; Dai, Yong; Poumellec, Bertrand; Lancry, Matthieu

doi:10.1016/j.ceramint.2021.08.333

Cited by 15 publications

(12 citation statements)

References 39 publications

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“…This is again a clue that viscosity should be the key factor here. The BaO-Ga 2 O 3 -GeO 2 (BGG) glass [ 42 , 43 ] exhibited a higher R and speed, but lower energy consumption. When the content of the alkali and alkaline earth cations increases, much more energy consumption is required for the formation of NGs.…”

Section: Resultsmentioning

confidence: 99%

On the Formation of Nanogratings in Commercial Oxide Glasses by Femtosecond Laser Direct Writing

et al. 2022

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Nanogratings (NGs) are self-assembled subwavelength and birefringent nanostructures created by femtosecond laser direct writing (FLDW) in glass, which are of high interest for photonics, sensing, five-dimensional (5D) optical data storage, or microfluidics applications. In this work, NG formation windows were investigated in nine commercial glasses and as a function of glass viscosity and chemical composition. The NG windows were studied in an energy—frequency laser parameter landscape and characterized by polarizing optical microscopy and scanning electron microscopy (SEM). Pure silica glass (Suprasil) exhibits the largest NG window, whereas alkali borosilicate glasses (7059 and BK7) present the smallest one. Moreover, the NG formation windows progressively reduced in the following order: ULE, GeO2, B33, AF32, and Eagle XG. The NG formation window in glasses was found to decrease with the increase of alkali and alkaline earth content and was correlated to the temperature dependence of the viscosity in these glasses. This work provides guidelines to the formation of NGs in commercial oxide glasses by FLDW.

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Section: Resultsmentioning

confidence: 99%

On the Formation of Nanogratings in Commercial Oxide Glasses by Femtosecond Laser Direct Writing

et al. 2022

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“…τ min can be approximated using the following formula: τ min ∼ w 2 0 /(4.D th ), where w 0 is the beam waist radius, D th the thermal diffusion coefficient, expressed as D th = κ/ ρ•C p , where κ is the thermal conductivity, ρ the volumetric mass density and C p the specific heat capacity. In this paper, we call this regime the "spatial broadening regime" [25].…”

Section: Identification Of Different Kinds Of Permanent Modifications...mentioning

confidence: 99%

“…The few studies of infrared glasses mainly dealt with the fabrication of waveguides [13,21,22] and did not address the fabrication of free space optics or microoptics for imaging applications. In order to reach these longer wavelengths in the IR range, nonsilicate glasses such as chalcogenide [23], fluoride [24] or heavy oxide [25] glasses must be used. All these glass families have a wider transmission band than the ubiquitous silicate glasses up to the mid-IR range.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Direct Writing of Gradient Index Fresnel Lens in GeS2-Based Chalcogenide Glass for Imaging Applications

et al. 2022

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Chalcogenide glasses have attracted growing interest for their potential to meet the demands of photonic applications in the Mid-Wavelength InfraRed (MWIR) and Long-Wavelength InfraRed (LWIR) transmission windows. In this work, we investigated the photosensitivity to femtosecond laser irradiation of a dedicated chalcogenide glass, along with its possible applications in micro-optics. In order to address the SWaP problem (Size, Weight and Power), this work took advantage of recent techniques in femtosecond laser direct writing to imprint flat and integrated optical systems. Here, we wanted to simplify an infrared multispectral imaging system which combines a lens array and a filter array. Each channel has a focal length of 7 mm and an f-number of 4. We show in this paper that the chosen GeS2-based chalcogenide glass is very promising for the fabrication of graded index optics by fs-laser writing, and particularly for the fabrication of Fresnel lenses. We note a very important phase variation capacity in this infrared material corresponding to refractive index variations up to +0.055. A prototype of Fresnel GRIN lens with a refractive index gradient was fabricated and optically characterized in the Vis range.

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“…[42,43] In this last decade, several research groups have already performed laser inscription in BGG glasses, proving the 3D fabrication of optical couplers or waveguides. [29,31,44] However, none of them have explored the potential of silver-doped BGG glasses for DLW.…”

Section: Introductionmentioning

confidence: 99%

Laser Direct Writing of Silver Clusters‐Based Subwavelength Periodic Structures Embedded in Mid‐Infrared Gallo‐Germanate Glass

Guerineau

Fargues

Lapointe

et al. 2022

Advanced Photonics Research

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Photosensitivity of barium germano-gallate glasses under femtosecond laser direct writing for Mid-IR applications

Cited by 15 publications

References 39 publications

On the Formation of Nanogratings in Commercial Oxide Glasses by Femtosecond Laser Direct Writing

On the Formation of Nanogratings in Commercial Oxide Glasses by Femtosecond Laser Direct Writing

Femtosecond Laser Direct Writing of Gradient Index Fresnel Lens in GeS2-Based Chalcogenide Glass for Imaging Applications

Laser Direct Writing of Silver Clusters‐Based Subwavelength Periodic Structures Embedded in Mid‐Infrared Gallo‐Germanate Glass

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