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    Doric Lenses Inc.
    https://optics.doriclenses.com › products › doric-grin-cylindrical-microlenses

    Doric GRIN Cylindrical Microlenses – Doric Lenses Inc.

    What are nanostructured GRIN lenses?
    The fabricated nanostructured GRIN lenses have a parabolic refractive index profile with a diameter of a standard fiber, very short working distances (55 µm in the air) and a high numerical aperture (NA = 0.16).
    nature.com
    Integrating Free-Form Nanostructured GRIN Microlen…

    A nanostructured gradient index component consists of two different types of glasses which are assembled34 in a certain pattern, which results in the continuous refractive index distribution. The calculations for the distribution of the two glass types are based on the Effective Medium Theory (EMT)35, where two properties such as the conductivity δ...

    Nature

    The stack-and-draw process was used to develop the nGRIN microlens. The technique consists of several steps shown in Fig. 11. First, we prepared round rods, approximately 0.5 mm in diameter, made from two types of borosilicate soft glasses (Fig. 11a) named NC42 (ng = 1.56895 for the sodium D line) and NC34 (n = 1.56078 for the sodium D line). The r...

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    Usually, the splicing method is used to connect elements in fiber optics. However, in our case gluing was used due to the thermal mismatch between materials from which the fiber, spacer and nGRIN lens are made. The SM980 (Thorlabs) fiber was made of pure silica for which the glass-transition temperature is equal 1200 °C. The spacer and the lens wer...

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    Numerical simulations of the beam propagation both for the ideal and the nGRIN lenses were based on the fast Fourier transform beam propagation method (FFT BPM)44. The analysis was carried out for the Gaussian beam propagating at a distance of 400 µm in a conventional SM optical fiber with the core diameter of 4.6 µm. Then, the light passed through...

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    The nGRIN lensed fibre system was characterized to verify its working distance (WD) and beam spot diameter (BS). All measurements were made in the air. We used 976 nm laser (BL976-SAG300. 300 mW) coupled into our lensed fiber system as the light source. At the output, the beam was magnified with an ×20 microscope objective (NA = 0.35) and then proj...

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