CN210142210U

CN210142210U - Light splitting self-focusing Glens lens

Info

Publication number: CN210142210U
Application number: CN201920308018.6U
Authority: CN
Inventors: 张红菊; 刘政
Original assignee: Femto Technology Xian Co Ltd
Current assignee: Femto Technology Xian Co Ltd
Priority date: 2019-03-12
Filing date: 2019-03-12
Publication date: 2020-03-13
Anticipated expiration: 2029-03-12

Abstract

The utility model relates to a beam split self-focusing Glens lens, it specifically includes lens body and anchor coat, has plated the beam split membrane on the play plain noodles of lens body, and the coating has the anchor coat between lens play plain noodles and the beam split membrane. The utility model provides a current beam split self-focusing Glens lens with high costs and the poor problem of reliability, the utility model provides a Glens lens is with low costs, reliability and stability are good.

Description

Light splitting self-focusing Glens lens

Technical Field

The utility model relates to a beam split self-focusing Glens lens.

Background

Currently, lenses for passive fiber optic communications are classified into two types: one is a Clens lens, which achieves light collimation and focusing by grinding different curvatures on the surface of a glass material, and the structure is shown in fig. 1. In the later stage of the production process of the self-focusing lens, in order to ensure that the self-focusing lens has higher transmittance, the light-emitting surface of the lens is coated with a film. The process of coating the end face of the Clens lens is shown in FIG. 2, the light emitting surface S2 of the Clens lens 1 is firstly coated with an antireflection film, then the Clens lens is arranged in a glass tube 2, and the Clens lens is cemented in the glass tube by an adhesive glue layer 3 and fixed well; and then the optical filter 4 is cemented on the Clens lens light-emitting surface S2 through the adhesive glue layer 3.

The other is a Glens lens, the structure of which is shown in FIG. 3. The Glens lens material has the characteristics of high central refractive index and low refractive indexes at two ends. The lens refractive index distribution formula is:

N₀represents the central refractive index of the self-focusing lens; r represents the radius of the self-focusing lens;

the refractive index distribution constant of the self-focusing Glens lens is shown.

None of the prior art methods for coating a Glens lens. The Clens lens coating has the following problems:

1) the cost is high: the glass tube is used and is also bonded by the adhesive, so that the material cost and the labor cost are increased;

2) the reliability is low: the optical filter is fixed on the end face of the lens through the adhesive, and the reliability is low.

3) Is not friendly to the environment: the glue is large in use amount and causes pollution to the environment.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of the existing light splitting film coating, the utility model provides a light splitting self-focusing lens coating method and a Glens lens.

The technical solution of the utility model is that:

the light splitting self-focusing Glens lens is characterized in that: the lens comprises a lens body, wherein a light splitting film is plated on a light emergent surface of the lens body.

Furthermore, the light splitting device also comprises a bonding layer, and the bonding layer is coated between the light emergent surface of the lens and the light splitting film.

Further, the light splitting film comprises a high refractive index material layer and a low refractive index material layer.

Further, the structure LH0.35LHLH0.5L1.2H (LH) 6L1.6H0.5L1.4H1.6L0.7HL of the light splitting film, wherein L represents a low refractive index material layer, H represents a high refractive index material layer, the number represents the thickness of the current layer, and 6 represents that the (LH) layer is repeated 6 times.

The utility model discloses the beneficial effect who has:

1. the utility model provides a beam split self-focusing Glens lens, its simple process, stability is high.

2. The cost is low: the coating process of the utility model saves the labor in the process of bonding the glass tube and the lens.

3. And (3) reliability: the film layer is directly plated on the end face of the lens, extra assembly and glue bonding are not needed, and the reliability is better.

4. Is environment-friendly. The utility model discloses an in the whole course of technology the glue use amount that significantly reduces, green more.

5. The self-focusing lens belongs to a formula glass material, has a special structure and poor environmental stability, so that a bonding layer with good stability is added between the lens and a film system by combining the performances of chemical substances and film materials contained in the lens, so that the lens is protected on one hand, and the bonding force between the lens and the film materials is ensured on the other hand.

6. The utility model provides a follow-up convenient to use of coating film Glens lens does not need other appurtenance.

Drawings

FIG. 1 is a schematic diagram of a Clens lens;

FIG. 2 is a schematic diagram of a conventional Clens lens film;

FIG. 3 is a schematic structural diagram of a self-focusing Glens lens;

FIG. 4 is a schematic structural view of a coated Glens lens;

wherein the reference numerals are: the device comprises a 1-Clens lens, a 2-glass tube, a 3-glue layer, a 4-optical filter, a 5-Glens lens and a 6-light splitting film.

Detailed Description

Example 1: a light splitting self-focusing Glens lens comprises the following film coating methods:

1) determining a membrane system structure:

determining a high refractive index material H and a low refractive index material L according to the refractive index distribution and technical requirements of the Glens lens, and further determining a primary film system structure;

the technical requirements are as follows:

s2 surface plated light splitting film

The working wavelength is as follows: 1260nm-1620nm

Transmittance of light

Transmission WDL: ≦ 0.25dB @1260nm-1380nm

≦0.2dB@1500-1620nm

Reflection WDL: 0.05dB ≦

Bearing optical power: the lens is required to withstand at least 1000mV of optical power emitted from the optical fiber

The working temperature range is-40 ℃ to +85 DEG C

The storage temperature is-40 ℃ to 150 DEG C

Working humidity: 0 to 90% RH

The center wavelength of the Glens lens is 1420nm, and the high-refractive-index material H in the film system structure is Ta₂O₅The low refractive index material L is SiO₂The primary film structure is HLH.

2) Optimizing the structure of a membrane system:

calculating the equivalent refractive index of the preliminary film system structure by using TFC software according to the technical requirement and the preliminary film system structure, and optimizing the preliminary film system structure to obtain an optimized film system structure, LH0.35LHLH0.5L1.2H (LH) 6L1.6H0.5L1.4H1.6L0.7HL, wherein the value of the index of the.

3) And (4) coating the film on the light-emitting surface of the Glens lens by adopting an IAD ion beam assisted deposition method according to the optimized film system structure.

Example 2: the coating process is IAD ion beam assisted deposition, and since the self-focusing Glens lens belongs to a formula glass material, the structure is special, and the environmental stability is poor, a bonding layer with good stability is added between the lens and a film system structure by combining the performances of chemical substances and film materials contained in the lens, so that the lens is protected on one hand, and the bonding force between the lens and the film system structure is ensured on the other hand.

Example 3: a light splitting self-focusing Glens lens comprises a lens body, wherein a light splitting film is plated on a light emitting surface of the lens body.

Example 4: the light splitting film is coated on the light emergent surface of the lens. The coating process is IAD ion beam assisted deposition, and since the self-focusing Glens lens belongs to a formula glass material, the structure is special, and the environmental stability is poor, a bonding layer with good stability is added between the lens and a film system structure by combining the performances of chemical substances and film materials contained in the lens, so that the lens is protected on one hand, and the bonding force between the lens and the film system structure is ensured on the other hand. The material of the bonding layer is silicon dioxide.

Selecting a film material matched with the expansion coefficient of a lens material according to a method for solving temperature drift by WDM, and adjusting the energy of an ion source in the process to change the deposition density of the film layer so as to achieve the matching effect;

wherein n is the refractive index and ρ is the concentration density of the film; j. the design is a square₀Is the ion current density; t is the lens temperature, P is the degree of vacuum, E₀Is the energy of the ion source; m is the ion mass; d is the diameter of the ion; m is the membrane molecular mass; r_MThe evaporation rate of the coating film; d_MIs the film material density, theta is the ion incidence angle, x is the distance of the ion to the lens, k is the Boltzmann constant, N_AAvogalois constant.

Parameter comparison:

parameter(s)	CLENS	GLENS	Remarks for note
				Temperature Dependent Loss (TDL)	<0.2dB	<0.15dB	Full temperature range
Polarization Dependent Loss (PDL)	<0.1dB	<0.1dB	Full temperature, full wavelength range
				Wavelength Dependent Loss (WDL)	<0.1dB	<0.1dB	Full wavelength, full polarization state

A light splitting film layer is directly plated on the Glens lens, Polarization Dependent Loss (PDL) and Wavelength Dependent Loss (WDL) are equivalent to the Clens parameter performance of a glass tube-attached optical filter, and temperature dependent loss is superior to that of the Clens scheme.

Claims

1. A beam-splitting self-focusing Glens lens, comprising: the lens comprises a lens body, a light splitting film is plated on a light emitting surface of the lens body, and the light splitting film comprises a high-refractive-index material layer and a low-refractive-index material layer.

2. The spectroscopic self-focusing Glens lens of claim 1, wherein: the light splitting film is coated on the light emergent surface of the lens.

3. The spectroscopic self-focusing Glens lens of claim 2, wherein: the structure of the light splitting film is LH0.35LHLH0.5L1.2H (LH). sub.6 6L1.6H0.5L1.4H1.6L0.7HL, wherein L represents a low refractive index material layer, H represents a high refractive index material layer, the number represents the thickness of the current layer, and ^6 represents that the (LH) layer is repeated 6 times.