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Figure 2 shows a magnified view of a typical polydimethylsiloxane (PDMS) parabolic microlens attached to the end of an SMF optical fiber (9/125 µm) with refractive index of core, respectively, is 1.4675 at 1.310 µm and 1.4681 at 1.550 µm. A numerical aperture of 0.12 and a relative refractive index difference of 0.36%. Fig. 2.
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Light coupling efficiency between LD and optical fiber, using this double plano-convex microlens, is 27.57% and 44.23% for single-mode and multi-mode fiber, respectively. View Show abstract
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The grinded fiber endface exhibited a double-variable curvature in the major axis, and was clearly observed for both major and minor axes after slight fusion polish. The perfect aspherical shape of the DVCM results in less grinding offset of 0.2 μm and better curvature radii control that leads to high average coupling efficiency of 83%.
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The outgoing light was introduced into a 50 µm-diameter step-index multimode optical fibre, whose NA was equal to 0.22, with the aid of a lens of f = 200 mm and diameter d = 70 mm positioned 350 ...
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A simple and novel method is proposed for the fabrication of aspherical SU-8 microlens arrays with a wide range of tunable focal lengths utilizing a soft SU-8 stamping process and an electro ...
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The aspherical microlens used for beam shaping of vertical-cavity surface emitting lasers (VCSELs) was designed and fabricated. The microlens designed as needed was directly fabricated and integrated in one step on the emitting surface of a VCSEL by femtosecond laser direct writing (FsLDW). By the microlens' shaping the beam quality of …
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Apparently, the CE value for d = 3 μm decreases from 72.8 % to 52.4 % as WD increases from 4 μm to 8 μm. Therefore, when the GRIN fiber is far away from the aspherical lens, the coupling light will be influenced, which is similar to previous reports [22]. Thus, the mode field of the aspherical lens can match well with that of the GRIN …
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In this study, we fabricated a novel microendoscope lens assembly comprised two nested pairs of aspherical microlenses made by precision glass molding. This assembly, which was 0.6 mm in diameter and 7.06 mm in length, was assembled in a stainless steel tube of 0.7 mm outer diameter. This assembly exhibited marked …
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The creation of a microlens at the end of an optical fiber occurred in several stages: (1) selection of an optical resin; (2) applying an optical resin to an intermediate element and transferring it to the end of the optical fiber; (3) imparting a given shape to a drop under the action of a high-frequency vibration field; and (4) polymerization of the …
DetailsThe microlens fibers were precisely controlled by automatic grinding and calibrated spin-on-glass (SOG) liquid electrostatic coating to achieve the required minor radius of curvature of 1.3- $mu ...
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In comparison with other microlens fabrication by mechanical grinding and multiple fusing techniques, the proposed M4FAs enable to adjust the fiber offset, radius of curvature, and alignment ...
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We demonstrate a new scheme of aspherical microlens (ASM). By employing a single-step grinding with fully automatic technique to precisely and quantitatively control the grinding offset less than 0.5 μm and minor radius of curvature within 2.4-3.5 μm, the ASMs exhibited a high-average coupling efficiency of 84.5%. This study demonstrates that the …
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Therefore, the control of fused-silica-based aspherical concave microlens by wet-etching assisted with shaping picosecond laser, remain to be investigated. In this paper, we propose shaping picosecond laser induced multi-step wet-etching for the rapid fabrication of aspherical MLA with different focal lengths on the same fused silica …
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A new scheme of hyperboloid microlens (HM) employing automatic grinding and precise fusing techniques to achieve high-average and high-yield coupling efficiency from high-power 980-nm lasers into ...
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Aspheric lenses have been desired increasingly in many products for the advantage of correcting optical aberrations. As a typical aspheric lens, semiellipsolid microlens has been applied in enhancing optical fiber coupling efficiency (Hu et al. 2008) and micro-optical systems where astigmatism correction is required (Lee et al. 2006, …
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Abstract. In this paper, the technology of a single mode fiber coupling to a semiconductor laser diode has been summarized and the latest developments in the bulk optics coupling scheme and the microlens fiber coupling scheme have been reviewed. The review has focused on optimizing the optical structure and the coupling parameters to …
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Based on optical-design requirements, an optical aspherical surface can be expressed as follows: (1) Z = x 2 R b a s e + R b a s e 2 − (1 + k) x 2 where R base is the radius of the base circle, and k is the coefficient used to control the shape of the sphere. For an ideal aspherical surface, R base = 70 and k = 0. The surface topography is shown in …
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Semantic Scholar extracted view of "An aspherical microlens assembly for deep brain fluorescence microendoscopy." by Masaaki Sato et al. ... This study designs a compact and high-speed system for fluorescent imaging at the tip of a fibre, achieving a resolution of 1.18 ± 0.04 µm, and demonstrates in vivo observations of cell bodies and ...
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We propose and demonstrate a new scheme of aspherical microlens (ASM) employing a single-step grinding technique with fully automated process for efficient coupling between the high-power 980-nm laser diodes and single mode fibers. The grinded fiber endface exhibited a double-variable curvature in the major axis, and was clearly observed for …
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aspherical microlens fiber grinder Michel CORNELOUP, Le An idea of aspherical microlens for fiber coupler of edge emitting LD has been proposed, These Micro An aspherical microlens has a small diameter of about 780 µm and a numerical aperture of 0275 The fabrication and assembly of the microlens fiberoptic connector have been …
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Aspherical Microlens Array Using Hot Embossing T echnology. ... Fang, F.Z. Off-spindle-axis spiral grinding of aspheric microlens array mold. inserts. Opt. Express 2019, 27, 10873–10889.
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Microlens arrays (MLAs) have garnered significant attention and have been used as an important component in many optical systems due to their broad range of applications 1, including digital ...
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A single-mode fiber with plano-convex silicon microlens is proposed for butt-coupling between single- mode fibers and high-index-contrast waveguides with fine mode-field diameter and experiments showed that the mode- field-diameter was successfully contracted from 10.5 to 1.3 microm with the lensed fiber. A single-mode fiber with plano …
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We demonstrate a new scheme of aspherical microlens (ASM). By employing a single-step grinding with fully automatic technique to precisely and quantitatively control the grinding offset less than 0.5 μm and minor radius of curvature within 2.4-3.5 μm, the ASMs exhibited a high-average coupling efficiency of 84.5%. This …
DetailsIn this paper, we present the method of microlens arrays formation on the fused silica surfaces by the irradiation of ytterbium fiber laser (λ = 1.064 μm, τ ~ 100 ns, ν 10–100 kHz).
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The aspherical microlens used for beam shaping of vertical-cavity surface emitting lasers (VCSELs) was designed and fabricated. ... The impact response of two different fiber materials-Kevlar 49 ...
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Here, we fabricated a fiber microlens in an ytterbium-doped double-cladding microstructured optical fiber for a fiber amplifier by CO 2-laser fusion. The microlens can combine the end-cap scheme, pump coupling and beam shaping. ... [13] Zhao K, Zhang B, Feng D and Song N 2018 Dynamics simulation and experiment of …
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Semantic Scholar extracted view of "(Sensors and Actuators A: Physical,147(1):093-098)Semi-ellipsoid microlens simulation and fabrication for enhancing optical fiber coupling efficiency" by J. Y. Hu et al.
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