CN211577484U - Optical fiber collimator for eliminating spherical aberration - Google Patents

Abstract

The invention relates to an aplanatic optical fiber collimator, which is a collimator combined by an optical fiber, a plano-convex C lens and a biconvex C lens, wherein the optical fiber is directly connected with the plane of the plano-convex C lens in a melting way, and the C lenses are respectively plated with a film layer with a specific wavelength, a high damage threshold value and high anti-reflection.

Description

Optical fiber collimator for eliminating spherical aberration

Technical Field

The invention relates to the field of laser devices, in particular to an optical fiber collimator for eliminating spherical aberration.

Background

In the related fields of optical communication and laser, a collimator is widely applied as a basic passive device, in some coupling systems, the collimator with low requirements can be directly coupled by using a collimator of a single C lens, but for some systems with higher requirements, higher requirements on collimated light spots and smaller requirements on spherical aberration, the spherical aberration needs to be corrected, so that the spherical aberration needs to be eliminated by adding the lens, and the common collimator of the single C lens cannot meet the requirement on spherical aberration.

Disclosure of Invention

In order to reduce spherical aberration, make laser beam focus better, the utility model provides an aplanatic optical fiber collimator, including optic fibre, plano-convex C lens, biconvex C lens, glass pipe, the plane of plano-convex C lens is not the coating film, directly is connected with optic fibre melting, and the convex surface plates the working wavelength antireflection film, and the working wavelength antireflection film is plated on biconvex C lens both sides, and plano-convex C lens and biconvex C lens assemble together in the glass pipe, make up into aplanatic lens.

Drawings

FIG. 1 is a schematic view of an optical fiber collimator with spherical aberration elimination

In the figure, 1 is a biconvex C lens, 2 is a plano-convex C lens, 3 is a glass tube, and 4 is an optical fiber.

Detailed Description

In the embodiment, as shown in fig. 1, a biconvex C lens 1, a plano-convex C lens 2, and an optical fiber 4 are mounted together in a glass tube 3 to form an aplanatic fiber collimator. The optical fiber 4 is directly connected with the plane of the plano-convex C lens 2 in a melting way to form a whole, the plano-convex C lens 2 is made of fused quartz, the plane is not coated with a film, and the other spherical surface is coated with an anti-reflection film with high damage of specific wavelength. Then the optical fiber collimator and the biconvex C lens 1 are both spherical surfaces, are plated with antireflection films with specific wavelength and high damage, and are made of optical glass and fused quartz and installed in a glass tube 3 together to form the optical fiber collimator. Biconvex C lens 1 is fixed in glass pipe one end, and optic fibre 4 inserts from the 3 other ends of glass pipe after with the butt fusion of planoconvex C lens 2, can finely tune the different working distances of interval adaptation between planoconvex C lens 2 and the biconvex C lens 1. Light from the light source enters the optical fiber collimator through the optical fiber 4, is emitted through the plano-convex C lens 2, is converged and deflected, passes through the biconvex C lens 1, is converged, and is deflected at a small angle through the two C lenses to correct spherical aberration. The light beams are symmetrical along the optical axis, and the light spots are circular light spots without eccentricity. The problem that the spherical aberration of the single C lens cannot be corrected is solved.

Claims (2)

1. An optical fiber collimator for eliminating spherical aberration is composed of optical fiber, plano-convex C lens, dual-convex C lens and glass tube, and features that the optical fiber is directly fusion-connected with the plane of plano-convex C lens, the other end of plano-convex C lens is spherical, and the dual-convex C lens is coated in the glass tube.

2. The aspherical optical fiber collimator as claimed in claim 1, wherein the plano-convex C lens is made of fused silica, the biconvex C lens is made of optical glass, fused silica, and the transparent end face is coated with a high anti-reflection film with a working wavelength.

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