CN109975927B - Athermalized broadband laser focusing system and fiber laser coupler - Google Patents

Athermalized broadband laser focusing system and fiber laser coupler Download PDF

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CN109975927B
CN109975927B CN201910361664.3A CN201910361664A CN109975927B CN 109975927 B CN109975927 B CN 109975927B CN 201910361664 A CN201910361664 A CN 201910361664A CN 109975927 B CN109975927 B CN 109975927B
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convex lens
focusing system
athermalized
laser focusing
range
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CN109975927A (en
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张新彬
陈怀熹
李广伟
冯新凯
古克义
梁万国
黄玉宝
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Fujian Cas Ctl Photonics Tech Co ltd
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Fujian Institute of Research on the Structure of Matter of CAS
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Laser Beam Processing (AREA)

Abstract

The application discloses no thermalization broadband laser focusing system and fiber laser coupler, this focusing system includes: the first convex lens, the second convex lens, the concave lens and the third convex lens are connected along the light beam transmission direction in sequence. The system can couple the space light beam generated by the array white light laser module into the optical fiber, has thermal stability, and reduces the adverse effect of chromatic aberration and temperature change on the coupling efficiency.

Description

Athermalized broadband laser focusing system and fiber laser coupler
Technical Field
The application relates to a athermalization broadband laser focusing system and an optical fiber laser coupler, belonging to the field of optics.
Background
In recent years, lasers and their applications are being developed vigorously, and among them, white laser modules are an important development direction for laser applications. White light laser modules can be used for lighting, surveying, stage lighting, and the like.
The white light laser generation module couples the RGB laser into a light beam, so that the white light laser output is realized. To uniformly mix the three lasers and facilitate manipulation of the beam, the three lasers are typically coupled into an optical fiber. In order to increase the optical power, array laser light sources are often used in the prior art to replace single lasers.
In the prior art, a laser focusing system can couple array space laser beams to optical fibers to realize white light output. The specific process is as follows: the space beam is focused to a light spot smaller than the diameter of the optical fiber core, and then the optical fiber incident port is placed at the minimum light spot, so that the laser at the light spot is incident to the optical fiber.
At present, most of laser focusing systems can only realize single-wavelength laser, and when the laser focusing systems are used for a white light module, chromatic aberration occurs, so that the coupling efficiency of the laser is reduced. In addition, high-power laser easily generates heat in the use process, the focal length of a laser focusing system can shift due to the change of temperature, and the coupling efficiency of the white light laser module is reduced due to the factor.
Disclosure of Invention
According to one aspect of the application, an athermalized broadband laser focusing system is provided, which can couple spatial light beams generated by an array white light laser module into an optical fiber, has thermal stability, and reduces adverse effects of chromatic aberration and temperature change on coupling efficiency.
The athermalized broadband laser focusing system is characterized by comprising: the light path connecting structure comprises a first convex lens, a second convex lens, a concave lens and a third convex lens, wherein the first convex lens, the second convex lens, the concave lens and the third convex lens are connected along a light beam transmission direction according to a sequence.
Optionally, the first convex lens satisfies the following condition:
Figure BDA0002047006430000021
wherein f isAIs the focal length of the first convex lens, fBIs the focal length of the second convex lens.
Optionally, the concave lens simultaneously satisfies the following condition:
Figure BDA0002047006430000022
VC＜32
wherein f isCIs the focal length of the concave lens, VCIs the abbe number of the concave lens.
Optionally, the third convex lens satisfies the following condition:
Figure BDA0002047006430000023
wherein f isDIs the focal length of the third convex lens.
Optionally, the total optical length TTHI of the athermalized broadband laser focusing system satisfies the following condition,
TTHI＜55mm。
optionally, the athermalized broadband laser focusing system satisfies the following condition:
Figure BDA0002047006430000024
wherein f is the focal length of the athermal broadband laser focusing system, and D is the light transmission diameter of the athermal broadband laser focusing system.
Optionally, the athermalized broadband laser focusing system satisfies the following condition:
|Δf|＜0.1mm
wherein, Δ f is the focus variation of the athermalized broadband laser focusing system in the process of increasing the working temperature from 0 ℃ to 100 ℃.
Optionally, the refractive index of the first convex lens ranges from 1.0 to 2.0, and the abbe number of the first convex lens ranges from 60.0 to 85.0; the refractive index range of the second convex lens is 1.0-2.0, and the dispersion coefficient range of the second convex lens is 50.0-55.0; the refractive index range of the concave lens is 1.0-2.0, and the dispersion coefficient range of the concave lens is 20.0-30.0; the refractive index range of the third convex lens is 1.0-2.0, and the dispersion coefficient range of the third convex lens is 20.0-25.0.
The upper limit and the lower limit of the refractive index range of the first convex lens can also be 1.50, 1.62, 1.53 and 1.73, and the upper limit and the lower limit of the dispersion coefficient range of the first convex lens can also be 81.59, 63.41, 60.2 and 65.0; the upper limit and the lower limit of the refractive index range of the second convex lens can also be 1.73, 1.75 and 1.69, and the upper limit and the lower limit of the dispersion coefficient range of the second convex lens can also be 51.49, 51.01 and 54.86; the upper limit and the lower limit of the dispersion coefficient range of the concave lens can be 23.79 and 30.06; the upper and lower limits of the range of the abbe number of the third convex lens can be 23.83, 23.79.
Optionally, the refractive index of the first convex lens ranges from 1.50 to 1.62, and the abbe number of the first convex lens ranges from 60.20 to 81.59; the refractive index range of the second convex lens is 1.69-1.75, and the dispersion coefficient range of the second convex lens is 51.01-54.86; the refractive index range of the concave lens is 1.85, and the dispersion coefficient range of the concave lens is 23.79-30.06; the refractive index range of the third convex lens is 1.85, and the dispersion coefficient range of the third convex lens is 23.79-23.83.
Optionally, the incident laser band range of the athermalized broadband laser focusing system is as follows: 0.455um-0.63 um.
Optionally, the operating temperature range of the athermalized broadband laser focusing system is as follows: -40 ℃ to +100 ℃.
According to a further aspect of the present application, there is provided a fiber laser coupler, including the athermalized broadband laser focusing system as described above, wherein the pump laser is incident on the athermalized broadband laser focusing system and then focused on the fiber.
The beneficial effects that this application can produce include:
1) the athermalized broadband laser focusing system provided by the application has the characteristics of athermalization and broadband. Can meet the requirements of high power and wide band of the white light laser module.
2) The athermalized broadband laser focusing system provided by the application has the following use temperature range: the temperature is between 40 ℃ below zero and 100 ℃, and the temperature range has higher thermal stability, thereby better reducing the influence of temperature change on optical fiber coupling. And the output laser power can reach more than or equal to 50W, which is beneficial to realizing high-power laser output.
3) The athermalized broadband laser focusing system provided by the application has the advantages that the diameter of a generated laser beam is larger than or equal to 13 mm; the laser wave band range can reach: 0.455um-0.63um, which satisfies the wavelength range of the coupling laser needed by the white light module.
4) The athermalized broadband laser focusing system provided by the application has the advantages that the circular energy in the diameter of 25um is more than or equal to 0.9, and the coupling efficiency is higher when the system is used for optical fiber coupling with the diameter of the core layer of 25 um.
Drawings
Fig. 1 is a schematic structural diagram of an athermal broadband laser focusing system according to an embodiment of the present disclosure;
fig. 2 is a chromatic aberration curve of an athermal broadband laser focusing system in embodiment 1 of the present application;
fig. 3 is a defocus curve of an athermal broadband laser focusing system in example 1 of the present application;
FIG. 4 shows the circular energy concentration ratio of the athermal broadband laser focusing system in example 1 of the present application at room temperature +20 ℃;
FIG. 5 shows the circular energy concentration ratio of the athermal broadband laser focusing system at-40 ℃ in example 1 of the present application;
FIG. 6 shows the circular energy concentration ratio of the athermal broadband laser focusing system at high temperature +100 ℃ in example 1 of the present application;
list of parts and reference numerals:
name of component Reference numerals
First convex lens A
Second convex lens B
Concave lens C
Third convex lens D
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Example 1
Referring to fig. 1, in this embodiment 1, an athermalized broadband laser focusing system includes: the lens comprises a first convex lens A, a second convex lens B, a concave lens C and a third convex lens D which are sequentially connected in an optical path along the transmission direction of light beams. The light beam first enters the first convex lens a. Focal length f of the first convex lens AAAnd focal length f of the second convex lens BBSatisfies the following formula:
Figure BDA0002047006430000051
in this embodiment 1, the focal length f of the concave lens CCCoefficient of dispersion VCThe following conditions are satisfied:
Figure BDA0002047006430000052
VC＝23.8
in this embodiment 1, the focal length f of the third convex lens DDThe following conditions are satisfied:
Figure BDA0002047006430000053
in this embodiment 1, the optical total length TTHI satisfies the following condition:
TTHI＝54.5mm
in this embodiment 1, the focal length f and the light transmission diameter D of the whole system satisfy the following conditions:
Figure BDA0002047006430000054
in this embodiment 1, the temperature is changed from 0 ℃ to 100 ℃, and the focal length change amount Δ f satisfies the following condition:
|Δf|＝0.088
the lens parameters for example 1 are shown in table 1.
TABLE 1
Figure BDA0002047006430000061
Example 2
In this embodiment 2, the difference from embodiment 1 is that:
focal length f of the first convex lens AAAnd focal length f of the second convex lens BBSatisfy the requirement of
Figure BDA0002047006430000062
In the present embodiment 2, the focal length f of the concave lens CCCoefficient of dispersion VCThe following conditions are satisfied,
Figure BDA0002047006430000063
VC＝23.8
in the present embodiment 2, the focal length f of the third convex lens DDThe following conditions are satisfied,
Figure BDA0002047006430000064
in this embodiment 2, the optical total length TTHI satisfies the following condition,
TTHI＝54.8mm
in this embodiment 2, the focal length f and the light transmission diameter D of the whole system satisfy the following conditions:
Figure BDA0002047006430000065
in this embodiment 2, the temperature is changed from 0 ℃ to 100 ℃, and the focal length change amount Δ f satisfies the following condition:
|Δf|＝0.067
the lens parameters for example 2 are shown in table 2:
TABLE 2
Figure BDA0002047006430000071
Example 3
The difference in this example 3 from example 1 is that:
focal length f of the first convex lens AAAnd focal length f of the second convex lens BBThe requirements are met,
Figure BDA0002047006430000072
in this embodiment 3, the focal length f of the concave lens CCCoefficient of dispersion VCThe following conditions are satisfied,
Figure BDA0002047006430000073
VC＝30.1
in this embodiment 3, the focal length f of the third convex lens DDThe following conditions are satisfied,
Figure BDA0002047006430000074
in this embodiment 3, the optical total length TTHI satisfies the following condition,
TTHI＝54.8mm
in this embodiment 3, the focal length f and the light transmission diameter D of the whole system satisfy the following conditions:
Figure BDA0002047006430000075
in this embodiment 3, the temperature is changed from 0 ℃ to 100 ℃, and the focal length change amount Δ f satisfies the following condition:
|Δf|＝0.078
the lens parameters for example 3 are shown in table 3:
TABLE 3
Figure BDA0002047006430000081
Example 3 can produce the same effect as example 1.
Example 4 Performance testing
Optical systems meeting various parameters in the embodiments 1 to 3 are respectively simulated through optical design software (ZEMAX or CODEV), chromatic aberration, defocusing and circular energy concentration degree tests at different temperatures are respectively carried out on the athermalized broadband laser focusing systems obtained in the embodiments 1 to 3, and typical output results are shown in FIGS. 2 to 6.
Fig. 2 is a chromatic aberration curve of the focusing system in example 1. As can be seen from FIG. 2, the chromatic aberration is less than 50um in the wavelength range from 0.45um to 0.63um, which satisfies the application of R laser (0.638um), G laser (0.525um) and B laser (0.455um) of the broadband white light module.
The test results of other embodiments are similar to the results of the focusing system in embodiment 1, and all can meet the application requirements of the white light band.
FIG. 3 is the defocus curve of the focusing system of example 1. from FIG. 3, it can be seen that the spot radius is less than 10um within + -0.1 mm defocus, which is well met with tolerances and is easily aligned in assembly for a 25um core diameter fiber.
The results of the testing of the other embodiments are similar to those of the focusing system of embodiment 1, and all meet the application requirements of assembly tolerance.
FIGS. 4-6 are graphs showing the circular energy concentrations at different temperatures for the focusing system of example 1. Line 1 in the figure represents: a diffraction limit; line 2 represents: and (5) actually measuring the result under each temperature condition. As can be seen from FIG. 4, under the condition of normal temperature +20 ℃, the energy concentration ratio within 7um of the circle radius is the diffraction limit and is more than 90 percent, which completely meets the optical fiber coupling of 25um core diameter; when the temperature is low-40 ℃, as shown in fig. 5, the energy in a circle with radius of 7um at the same position is also the diffraction limit and is more than 90%; when the temperature is +100 ℃, the energy in the circle of radius 7um at the same location, as shown in fig. 6, although reduced, is also close to the diffraction limit and greater than 90%.
The test results of other examples are similar to the results of the focusing system in example 1, and all have the characteristics of high thermal stability and wide thermal stability temperature range.
Therefore, the space light beam generated by the row white light laser module can be efficiently coupled into the optical fiber with the core diameter of 25um, and the optical fiber has thermal stability in the range from low temperature of minus 40 ℃ to high temperature of plus 100 ℃.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.

Claims (6)

1. An athermalized broadband laser focusing system, comprising: the light path of the first convex lens, the second convex lens, the concave lens and the third convex lens is sequentially connected along the light beam transmission direction;
the first convex lens and the second convex lens satisfy the following conditions:
Figure FDA0003007933850000011
wherein f isAIs the focal length of the first convex lens, fBIs the focal length of the second convex lens;
the concave lens simultaneously satisfies the following conditions:
Figure FDA0003007933850000012
VC<32
wherein f isCIs the focal length of the concave lens, VCIs the abbe number of the concave lens;
the third convex lens satisfies the following condition:
Figure FDA0003007933850000013
wherein f isDIs the focal length of the third convex lens;
the athermalized broadband laser focusing system meets the following conditions:
|Δf|<0.1mm
wherein, Δ f is the focus variation of the athermalized broadband laser focusing system in the process of increasing the working temperature from 0 ℃ to 100 ℃.
2. The athermalized broadband laser focusing system of claim 1, wherein the total optical length TTHI of the athermalized broadband laser focusing system satisfies the following condition,
TTHI<55mm。
3. the athermalized broadband laser focusing system of claim 1, wherein the athermalized broadband laser focusing system satisfies the following condition:
Figure FDA0003007933850000021
wherein f is the focal length of the athermal broadband laser focusing system, and D is the light transmission diameter of the athermal broadband laser focusing system.
4. The athermalized broadband laser focusing system of claim 1, wherein the refractive index of the first convex lens is in the range of 1.0 to 2.0, and the abbe number of the first convex lens is in the range of 60.0 to 85.0;
the refractive index range of the second convex lens is 1.0-2.0, and the dispersion coefficient range of the second convex lens is 50.0-55.0;
the refractive index range of the concave lens is 1.0-2.0, and the dispersion coefficient range of the concave lens is 20.0-30.0;
the refractive index range of the third convex lens is 1.0-2.0, and the dispersion coefficient range of the third convex lens is 20.0-25.0.
5. The athermalized broadband laser focusing system of claim 1, wherein the refractive index of the first convex lens is in the range of 1.50-1.62, the abbe number of the first convex lens is in the range of 60.20-81.59;
the refractive index range of the second convex lens is 1.69-1.75, and the dispersion coefficient range of the second convex lens is 51.01-54.86;
the refractive index range of the concave lens is 1.85, and the dispersion coefficient range of the concave lens is 23.79-30.06;
the refractive index range of the third convex lens is 1.85, and the dispersion coefficient range of the third convex lens is 23.79-23.83.
6. A fiber laser coupler, comprising the athermalized broadband laser focusing system as claimed in any one of claims 1 to 5, wherein the pump laser is incident on the athermalized broadband laser focusing system and focused on the fiber.
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US6104546A (en) * 1997-11-25 2000-08-15 Fuji Photo Optical Co., Ltd. Athermalized focal length extender for a zoom lens having a split rear image-forming group
CN108121021A (en) * 2016-11-30 2018-06-05 豪威科技股份有限公司 Without hot compound lens

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CN2710008Y (en) * 2004-06-25 2005-07-13 肯顺科技股份有限公司 Long-short automatic focus camera
CN2750926Y (en) * 2004-12-16 2006-01-11 苏州大学 Large working surface laser marking lens
CN102183836B (en) * 2011-05-14 2012-09-19 苏州大学 Infrared double-waveband athermalization optical lens
CN204462514U (en) * 2015-03-13 2015-07-08 昆明全波红外科技有限公司 A kind of without thermal infrared camera lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6104546A (en) * 1997-11-25 2000-08-15 Fuji Photo Optical Co., Ltd. Athermalized focal length extender for a zoom lens having a split rear image-forming group
CN108121021A (en) * 2016-11-30 2018-06-05 豪威科技股份有限公司 Without hot compound lens

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