3D Optical Waveguides in Ge22As20Se58 Glass - a Highly Nonlinear Material for the Mid-IR

Morris, James M.; Demetriou, Giorgos; Lancaster, Adam; Kar, Ajoy K.; Bookey, Henry T.

doi:10.1364/cleo_at.2016.jth2a.82

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…It would be of practical importance for applications including, but not limited to, home automation, smartphones and even automotive applications. 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.…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…It would be of practical importance for applications including, but not limited to, home automation, smartphones or even automotive applications. The few studies in infrared glasses mainly deal with the fabrication of waveguides [15,23,24] and do not address the fabrication of free space optics or micro-optics [25] for imaging applications. In order to reach these longer wavelengths in the IR range, non-silicate glasses, such as chalcogenides [26], fluorides [27] or heavy oxides [28] must be used.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser direct writing of a gradient index Fresnel lens in a heavy oxide glass

Delullier

Druart

Barrière

et al. 2022

Novel Optical Systems, Methods, and Applications XXV

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An important challenge in infrared imaging today consists in addressing the SWaP problem (Size, Weight and Power), for example by simplifying as much as possible the optical system before the sensor. The work presented in this paper takes advantage of recent techniques in femtosecond laser direct writing to imprint optical systems. We want to simplify an infrared multispectral imaging system, which combines a lens array and a filter array.This work aims at merging a lens array with a filter array by writing gradient index lenses with a femtosecond laser inside a dedicated glass substrate. A classical gradient index requires a huge refractive index variation, which cannot be reached today with femtosecond laser processing (Δ𝑛 𝑚𝑎𝑥 ~ 0.05). So, we decided to turn towards writing a gradient index Fresnel lens. A first-order Fresnel lens was designed with a Δ𝑛 𝑚𝑎𝑥 < 0.05 discretized into 8 index levels to guarantee a diffraction efficiency of 85% on the overall spectral bandwidth of the filters. The multispectral design is made of an array of 2x2 Fresnel lenses in a landscape lens configuration. For a horizontal field of view of 40°, each GRIN Fresnel lens has 82 rings inside a total diameter of 3.8 mm.After characterizing the photosensitive response of the material to fs-laser writing, we started writing the first prototypes of graded index Fresnel lenses. For a first approach, a discretization on 4 index levels was chosen. A focal length measurement has been performed in order to compare it with our model.

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3D Optical Waveguides in Ge22As20Se58 Glass - a Highly Nonlinear Material for the Mid-IR

Cited by 2 publications

References 8 publications

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

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

Femtosecond laser direct writing of a gradient index Fresnel lens in a heavy oxide glass

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