Patent
Microlenses for coupling optical fibers to elliptical light beams
TLDR
An asymmetric hyperbolic microlens on the end of a single-mode optical fiber enhances the fiber's coupling to elliptical laser beams as mentioned in this paper, which is useful to pump erbium-doped fiber amplifiers.Abstract:
An asymmetric hyperbolic microlens on the end of a single-mode optical fiber enhances the fiber's coupling to elliptical laser beams The lenses, with controlled eccentricity ratios, are made by micromachining the end of the fiber with a pulsed CO₂ laser as the fiber is directed, preferably by computer control, about the focused laser beam Coupling efficiencies of 90 percent (-075 dB) have been realized with single transverse mode lasers at a wavelength of 098 µm having an approximately 3 to 1 beam ellipticity With multimode lasers at 148 µm having similar elliptical beams, the asymmetric lenses demonstrate an almost 2 dB increase in coupling efficiency over symmetric hyperbolic microlenses Such lasers are useful to pump erbium-doped fiber amplifiers About 120 mw was coupled from such a laser into single-mode fiberread more
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Beam bending apparatus and method of manufacture
TL;DR: In this article, an apparatus for altering the mode field of an optical signal is described, which includes a GRIN-fiber lens and a reflective surface disposed at one end of the lens to redirect the path of the optical signal directed against the reflective surface.
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Molded plastic optical fiber-optoelectronic converter subassembly
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Semiconductor device and manufacturing method
Kikuko Sugimae,Hiroyuki Kutsukake,Masayuki Ichige,Michiharu Matsui,Yuji Takeuchi,Riichiro Shirota +5 more
TL;DR: In this article, a semiconductor device comprises a memory cell array portion and a peripheral circuit portion, wherein a first insulation film including elements as main components other than nitrogen fills between the memory cell gate electrodes of the memory array portion, and a second insulation film, including nitrogen as the main component is formed on the sidewall of the peripheral gate electrode via the insulation film.
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Laser cutting method and apparatus for optical fibres or waveguides
TL;DR: In this article, a cutting method and apparatus are provided to cut a portion of an optical fiber or waveguide with a laser beam, which takes advantage of the sharp cutting edge of the laser beam generated so as to have a predetermined asymmetric intensity distribution.
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Optical fiber or waveguide lens
TL;DR: In this article, a femtosecond laser is used to make a lens on an optical fiber or waveguide, which can be further smoothed by the application of heat.
References
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Patent
Manufacture of ophthalmic lenses by excimer laser
TL;DR: In this article, complex small objects such as ophthalmic lenses are quickly and accurately fabricated from plastic or glass blanks of ablatable material by cutting, shaping and radiusing the blank entirely by laser light, using appropriate masks and focusing optics.
Patent
Method and apparatus for fabricating microlenses on optical fibers
TL;DR: In this paper, a process and apparatus for fabricating microlenses on optical fibers is described, where a pulsed laser beam and an end portion of a fiber are arranged relative to each to another so that the laser beam is incident on the end of the fiber at an acute angle θ to the longitudinal axis.
Journal ArticleDOI
Efficient laser diode to single-mode fiber coupling using a combination of two lenses in confocal condition
M. Saruwatari,T. Sugie +1 more
TL;DR: In this article, a new coupling method of a laser diode to a single-mode fiber is described, which consists of a spherical ruby lens and a graded index (GRIN) rod lens positioned under a confocal condition.
Journal ArticleDOI
Efficient power coupling from a 980-nm, broad-area laser to a single-mode fiber using a wedge-shaped fiber endface
TL;DR: In this paper, a theoretical and experimental study of an efficient technique for coupling a broad-area laser to a single-mode fiber without the use of bulk optical components was carried out, which uses a wedge-shaped fiber endface to approximate a cylindrical lens action to correct for the phase mismatch between the curved laser beam wavefront and the planar fiber beam.
Patent
Coupling of optical devices to optical fibers by means of microlenses
TL;DR: In this article, the authors proposed to use a microlens at the end of an optical fiber to improve the optical energy efficiency by coupling optical energy efficiently by means of a micro-lens shape substantially a hyperboloid of revolution.