CN109541501A - A kind of optical fiber alkali metal gas chamber - Google Patents
A kind of optical fiber alkali metal gas chamber Download PDFInfo
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- CN109541501A CN109541501A CN201811553839.2A CN201811553839A CN109541501A CN 109541501 A CN109541501 A CN 109541501A CN 201811553839 A CN201811553839 A CN 201811553839A CN 109541501 A CN109541501 A CN 109541501A
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- optical fiber
- screw thread
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- left end
- thread seal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a kind of optical fiber alkali metal gas chambers.The gas chamber sets out from integrated level, miniaturization, and the angle conveniently integrated with optical fibre device, carries out the design of alkali metal air chamber structure.The gas chamber passes through T-type glass seal of tube vapour of an alkali metal, optical fiber is fixed in T-type pipe using ceramic insertion core align structures, and guaranteeing that light can be passed through and be contacted with each other with vapour of an alkali metal, the both ends of T-type pipe carry out the sealing of T row pipe and optical fiber by threaded sealing structure.This structure is convenient to for gas chamber being connected with various optical fibre devices, minimizes atom magnetometer for all -fiber and provides possibility.
Description
Technical field
The present invention relates to sub- quantum sensing and quantum field of precision measurement.Especially a kind of light that can be integrated with fibre system
Fine alkali metal gas chamber.
Background technique
Currently, the sensor based on atomic spin effect has ultra-high sensitive characteristic, studied in basic physics, biology doctor
It learns, the fields such as earth-magnetism navigation all have good development prospect.Currently, the miniaturization of atom magnetometer is brain magnetic and magnetocardiogram measurement
The urgent need of application.Therefore, optical fiber atom magnetometer becomes a research hotspot in atom magnetometer field.
And limit at present an important factor for it further develops be optical fiber alkali metal gas chamber scheme it is not yet mature.It is existing
There are two types of schemes, one is in the fiber core for being discharged Rb atom using photoinduction principle, but this scheme can generate compared with
High insertion loss.Another scheme is using single mode optical fiber-capillary-multimode fibre welding scheme, but due to using more
Mode fiber is not easy to be integrated in magnetometer system.Therefore, it is current that the optical fiber gas chamber of atom magnetometer can be integrated in by, which how making,
Technological difficulties.
Summary of the invention
Technology of the invention solves the problems, such as: all -fiber atom magnetometer is the important branch of atom magnetometer miniaturization,
And optical fiber alkali metal gas chamber is the technical foundation for realizing all -fiber atom magnetometer, the present invention provides a kind of optical fiber alkali metal gas
Room fills the domestic gaps.By using substance needed for the quantum sensings such as T-type glass tube encapsulation alkali metal and accurate measurement；It utilizes
Optical fiber insertion glass tube meets optical fiber gas chamber and connect with the matching of other optical fibre devices；Using ceramic align structures maximize light with
Atomic interaction volume improves quantum accurate measurement signal.
The present invention solves the technical solution that above-mentioned technical problem uses are as follows: kind optical fiber alkali metal gas chamber, comprising: spiral shell in left end
Line seal cap (1), left end external screw thread seal pipe (2), left end polarization maintaining optical fibre (3), left end air-core photon crystal optical fiber (4), a left side
Optical fiber ceramic lock pin (5), porcelain bushing (6), right end internal screw thread seal cap (7), right end external screw thread seal pipe (8), right end is held to protect
Polarisation fibre (9), right end air-core photon crystal optical fiber (10), right end optical fiber ceramic lock pin (11), T-type glass tube (12)；It is all
Accessory is encapsulated in T-type glass tube (12), and symmetrical configuration；Left end polarization maintaining optical fibre (3) and left end air-core photon crystal
Optical fiber (4) is made up of welding, and air-core photon crystal optical fiber (4) tail end in left end is internal in T-type glass tube (12), is placed in T-type
Glass tube (12) has transverse tube one end of both ends through-hole, and is inserted into left end optical fiber ceramic lock pin (5)；Left end polarization maintaining optical fibre (3) tail
End is external in T-type glass tube (12) and passes through left end external screw thread seal pipe (2) and internal screw thread seal cap (1)；Wherein, left end light
Fine ceramic insertion core (5) center has axial round tube hole, and tail end has tapered groove；Left end air-core photon crystal optical fiber (4) tail
End is inserted through through-hole by left end optical fiber ceramic lock pin (5) tail end and reaches left end optical fiber ceramic lock pin (5) top, then in left end
Optical fiber ceramic lock pin (5) tail end injects a small amount of sealant for fixing.Fix rear left end optical fiber ceramic lock pin (5) insertion ceramics
Casing (6), the depth of insertion are left end optical fiber ceramic lock pin (5) top at porcelain bushing (6) center about 1-2mm；Right end
Light passing optical fiber is equally made up of right end polarization maintaining optical fibre (9) and right end air-core photon crystal optical fiber (10) welding；Right end is empty
Gaseous core photonic crystal fiber (10) tail end is internal in T-type glass tube (12), and is inserted into right end optical fiber ceramic lock pin (11)；Right end is protected
Polarisation fibre (9) tail end is external in T-type glass tube (12) and passes through right end internal screw thread seal cap (7) and right end external screw thread seal pipe
(8), wherein right end air-core photon crystal optical fiber (10) tail end is inserted through logical by right end optical fiber ceramic lock pin (11) tail end
Hole reaches right end optical fiber ceramic lock pin (11) top, then injects a small amount of vacuum compound in right end optical fiber ceramic lock pin (11) tail end
For fixing.Rear right end optical fiber ceramic lock pin (11) insertion porcelain bushing (6) is fixed, the depth of insertion is right end optical fiber ceramic
Lock pin (11) top is at porcelain bushing (6) center about 1-2mm.
Left end external screw thread seal pipe (2) fits snugly in T-type glass tube (12) transverse tube left end, left end internal screw thread seal cap
(1) left end external screw thread seal pipe (2) outside is fitted snugly in by screw thread.Left end internal screw thread seal cap (1) and left end external screw thread
There are the through-holes of about 2.5mm at seal pipe (2) axle center passes through by left end polarization maintaining optical fibre (3), close using vacuum compound later
Seal through-hole；Right end external screw thread seal pipe (7) fits snugly in T-type glass tube (12) transverse tube right end, right end internal screw thread seal cap (7)
It is external that right end external screw thread seal pipe (8) is fitted snugly in by screw thread；Right end internal screw thread seal cap (7) and the sealing of right end external screw thread
There are the through-holes of about 2.5mm at pipe (8) axle center passes through by right end polarization maintaining optical fibre (9), is sealed later using vacuum compound logical
Hole.
The T-type glass tube (12) is borosilicate glass material, in order to prevent gas chamber to be corroded when being filled with alkali species.
The outer spiral shell of left end internal screw thread seal cap (1), right end internal screw thread seal cap (7), left end external screw thread seal pipe (2) and right end
Line seal pipe (8) is metallic aluminum material, guarantees that there is structure certain degree of hardness to have both low magnetic characteristic again.
For seal left end internal screw thread seal cap (1), right end internal screw thread seal cap (7), left end external screw thread seal pipe (2) and
The glue of right end external screw thread seal pipe (8) be condition of high vacuum degree, i.e., 10-6The vacuum sealing glue material of Pa, guarantee gas chamber after packaging with
Outside air isolation.
For T-type glass tube tool, there are two one end of through-hole to be referred to as transverse tube, is referred to as longitudinal tubule (L tubule) perpendicular to one end of transverse tube,
Longitudinal tubule (L tubule) is sintered sealing for being filled with substance needed for alkali metal after filling.
A kind of the principle of the present invention: optical fiber alkali metal gas chamber, characterized by comprising: internal screw thread seal cap, external screw thread are close
Tube sealing, polarization maintaining optical fibre, air-core photon crystal optical fiber, ceramic insertion core, porcelain bushing, T-type glass tube, in which:
Fiber section structure is divided into two sections of left and right, and left end optical fiber is passed through molten by polarization maintaining optical fibre and air-core photon crystal optical fiber
Connect composition；Air-core photon crystal optical fiber connects ceramic insertion core, and fiber tip is aligned with ceramic insertion core.In order to fix optical fiber in pipe
Interior position is fixed optical fiber and ceramic insertion core input terminal using vacuum compound；The two sections of optical fiber in left and right are full symmetric, and right section
No longer illustrate.The two sections of optical fiber in left and right are fixed in porcelain bushing by ceramic insertion core, retain 2-4mm's among two sections of optical fiber
The air gap, adjustment both ends ceramic insertion core insertion porcelain bushing position adjust light passing power to maximum, guarantee that light can be with atom
Interaction.
Optical fiber structure runs through T-type glass tube long tube, and the polarization maintaining optical fibre at both ends, which stretches out outside glass tube, passes through internal screw thread seal cap
Light hole；T-type glass tube long tube both ends are mounted with that external screw thread seal pipe, seal pipe are closely matched with glass tube by mechanical structure
It closes；Internal screw thread seal cap screws external screw thread seal pipe, after keeping pipe inner fiber to stretch naturally, to optical fiber and internal screw thread seal cap
Junction is sealed using vacuum compound.Vacuum compound carries out subsequent operation after waiting glue to air-dry completely again.
Be filled in T-type glass tube quantum sensing and measurement required thing, such as alkali metal, inert gas and be quenched gas satisfaction
The substance of quantum sensing and measurement different demands is sintered sealing, guarantees by filling at T shape glass tube short tube after filling
Substance will not be revealed in managing.
The advantages of the present invention over the prior art are that:
(1) all -fiber atom magnetometer is the important branch of atom magnetometer miniaturization scheme, and optical fiber alkali metal gas chamber
It is the basis of the realization of atom magnetometer all-fiber, fills the domestic gaps that there is important engineering significance.
(2) optical fiber alkali metal air cell size is small, is easily integrated and minimizes, and meets the needs of atom magnetometer miniaturization.
(3) the light input and output side of optical fiber alkali metal gas chamber has polarization maintaining optical fibre composition.Optical fiber structure it is convenient with it is various
Optical fibre device is integrated, and polarization property can satisfy quantum sensing and quantum accurate measurement to the various demands of the polarization state of light.
(4) using substances such as T-type glass tube structure filling alkali metal, filling mode is flexible, and good airproof performance.
(5) two sections of fiber alignment structures are used, can guarantee light and atomic interaction volume to the greatest extent, while again
The insertion loss that gas chamber can be reduced solves the problems, such as that current gas chamber insertion loss is done.
(6) optical fiber alkali metal gas chamber of the invention has the input/output terminal of polarization maintaining optical fibre, and polarization maintaining optical fibre structure is convenient for collection
At into current most fibre system, it is integrated to solve the problems, such as that existing scheme is difficult to.
(7) optical fiber alkali metal gas chamber of the invention uses air-core photon crystal optical fiber structure, can guarantee more
Light and alkali metal phase interaction, belong to transmission-type optical fiber alkali metal air chamber structure；This structure meets the need of a variety of optical systems
It asks, flexibility and strong applicability.
Detailed description of the invention
Fig. 1 is optical fiber alkali metal air chamber structure figure of the invention, wherein 1 is left end internal screw thread seal cap, 2 is outside left end
Thread seal pipe, 3 be left end polarization maintaining optical fibre, 4 be left end air-core photon crystal optical fiber, 5 be left end optical fiber ceramic lock pin, 6 be
Porcelain bushing；7 it is right end internal screw thread seal cap, 8 be right end external screw thread seal pipe, 9 be right end polarization maintaining optical fibre, 10 is right end air
Core photonic crystal fiber, 11 be right end optical fiber ceramic lock pin, 12 be T-type glass tube.
Fig. 2 is vacuum chamber sealed structure chart of the invention；
Fig. 3 is optical fiber align porcelain bushing structure chart of the invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment further illustrates the present invention.
As shown in Figure 1, optical fiber alkali metal gas chamber of the invention includes left end internal screw thread seal cap 1, the sealing of left end external screw thread
Pipe 2, left end polarization maintaining optical fibre 3, left end air-core photon crystal optical fiber 4, left end optical fiber ceramic lock pin 5, porcelain bushing 6, in right end
Thread seal cap 7, right end external screw thread seal pipe 8, right end polarization maintaining optical fibre 9, right end air-core photon crystal optical fiber 10, right end optical fiber
Ceramic insertion core 11, T-type glass tube 12.
Left end polarization maintaining optical fibre 3 and right end polarization maintaining optical fibre 9 should select birefringent larger, the type of polarization-maintaining better performances, meet
The requirement of quantum sensing and accurate measurement to polarization state.Left end air-core photon crystal optical fiber 4 and right end air-core photon are brilliant
The type that body optical fiber 10 should select air-core big as far as possible guarantees that more light can be contacted with vapour of an alkali metal, and can guarantee
There is lesser splice loss, splice attenuation with polarization maintaining optical fibre.
Left end air-core photon crystal optical fiber 4 and 10 end face of right end air-core photon crystal optical fiber should be smooth as far as possible, guarantee
Higher output facula quality.
Light passing fiber section structure is divided into two sections of left and right, and left end polarization maintaining optical fibre 3 and left end air-core photon crystal optical fiber 4 are logical
Cross welding composition；Left end air-core photon crystal optical fiber 4 connects left end optical fiber ceramic lock pin 5, left end air-core photon crystal light
Fine 4 end faces are aligned with left end optical fiber ceramic lock pin 5.In order to fix left end light passing optical fiber position in T-type glass tube 12, using true
Left end air-core photon crystal optical fiber 4 and 5 tail end of left end optical fiber ceramic lock pin is fixed in empty sealant；The two sections of optical fiber in left and right
Full symmetric, right end polarization maintaining optical fibre 9 and right end air-core photon crystal optical fiber 10 are made up of welding；Right end air-core photon is brilliant
Body optical fiber 10 connects right end optical fiber ceramic lock pin 11,10 end face of right end air-core photon crystal optical fiber and right end optical fiber ceramic lock pin
11 alignment.In order to fix right end light passing optical fiber position in T-type glass tube 12, using vacuum compound to right end air-core photon
Crystal optical fibre 10 is fixed with right end optical fiber ceramic lock pin 11.
As shown in Fig. 2, left end optical fiber ceramic lock pin 5 and right end optical fiber ceramic lock pin 11 are respectively intended to the light passing of fixed left end
The light passing optical fiber of optical fiber and right end.The air gap for retaining 2-4mm among two sections of optical fiber, adjusts 5 He of left end optical fiber ceramic lock pin
Right end optical fiber ceramic lock pin 11 is inserted into porcelain bushing position and adjusts light passing power to maximum, guarantees that light can be with atom phase interaction
With.
For the relative position fixed in light passing optical fiber and T-type glass tube 12, guarantee the stability of optical transport, needing will be left
End air-core photon crystal optical fiber 4 and right end air-core photon crystal optical fiber 10 are separately fixed at left end light by way of glue seals
It in fine ceramic insertion core 5 and right end optical fiber ceramic lock pin 11, is air-dried completely to glue and carries out subsequent operation again, guarantee system in higher temperatures
It can guarantee stable performance under degree.
As shown in figure 3, among left end internal screw thread seal cap 1 and left end external screw thread seal pipe 2, there are allow optical fiber structure to run through
Light passing；Left end internal screw thread seal cap 1 and left end external screw thread seal pipe 2 are fitted close by mechanical structure；Left end internal screw thread is close
Sealing cap 1 screws left end external screw thread seal pipe 2, keep managing in after left end light passing optical fiber stretches naturally, to left end light passing optical fiber with it is interior
The junction of thread seal cap 1 is sealed using vacuum compound.After vacuum compound carries out again after waiting glue to air-dry completely
Continuous operation.Similarly, there are allow the perforative light passing of optical fiber structure among right end internal screw thread seal cap 7 and right end external screw thread seal pipe 8；
Right end internal screw thread seal cap 7 and right end external screw thread seal pipe 8 are fitted close by mechanical structure；Right end internal screw thread seal cap 7 is revolved
Tight right end external screw thread seal pipe 8, after keeping the interior left end light passing optical fiber of pipe to stretch naturally, to right end light passing optical fiber and right end internal screw thread
The junction of seal cap 7 is sealed using vacuum compound.
The air gap of two sections of optical fiber should lean on entad in T-type glass tube 12, guarantee that more atoms can be with light
It contacts with each other.
Left end internal screw thread seal cap 1, right end internal screw thread seal cap 7, left end external screw thread seal pipe 2 and the sealing of right end external screw thread
Pipe 8, it should which selection is without magnetic or low magnetic material.Since gas chamber has higher requirement to vacuum degree, internal screw thread seal cap and
Aluminium or other low magnetic density closure materials may be selected in external screw thread seal pipe.
Before being filled, gas chamber should access vacuum measuring device and carry out vacuum measurement, guarantee vacuum degree 10-6Pa
Magnitude.
It is filled with quantum sensing and measurement required thing in T-type glass tube 12, such as alkali metal, inert gas and that gas is quenched is full
Enough sub- sensings and the substance for measuring different demands are sintered sealing by filling at 12 longitudinal tubule (L tubule) of T shape glass tube after filling,
Guarantee that managing interior substance will not reveal.Charge should the air pressure when guaranteeing 200 DEG C or so meet the tolerance degree of glass material,
Guarantee the stability of gas chamber.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (6)
1. a kind of optical fiber alkali metal gas chamber, it is characterised in that: including left end internal screw thread seal cap (1), left end external screw thread seal pipe
(2), left end polarization maintaining optical fibre (3), left end air-core photon crystal optical fiber (4), left end optical fiber ceramic lock pin (5), porcelain bushing
(6), right end internal screw thread seal cap (7), right end external screw thread seal pipe (8), right end polarization maintaining optical fibre (9), right end air-core photon are brilliant
Body optical fiber (10), right end optical fiber ceramic lock pin (11), T-type glass tube (12)；All accessories are encapsulated in T-type glass tube (12)
It is interior, and symmetrical configuration；Left end polarization maintaining optical fibre (3) and left end air-core photon crystal optical fiber (4) are made up of welding, and left end is empty
Gaseous core photonic crystal fiber (4) tail end is internal in T-type glass tube (12), is placed in the cross that T-type glass tube (12) have both ends through-hole
Pipe one end, and it is inserted into left end optical fiber ceramic lock pin (5)；Polarization maintaining optical fibre (3) tail end in left end is external in T-type glass tube (12) and wears
Cross left end external screw thread seal pipe (2) and internal screw thread seal cap (1)；Wherein, optical fiber ceramic lock pin (5) center in left end has axial circular
Through-hole, tail end have tapered groove；Air-core photon crystal optical fiber (4) tail end in left end is by left end optical fiber ceramic lock pin (5) tail end
It is inserted through through-hole and reaches left end optical fiber ceramic lock pin (5) top, then is a small amount of in the injection of left end optical fiber ceramic lock pin (5) tail end
Sealant is for fixing；Rear left end optical fiber ceramic lock pin (5) insertion porcelain bushing (6) is fixed, the depth of insertion is left end light
Fine ceramic insertion core (5) top is at porcelain bushing (6) center about 1-2mm；Right end light passing optical fiber is equally by right end polarization maintaining optical fibre
(9) it is made up of with right end air-core photon crystal optical fiber (10) welding；Right end air-core photon crystal optical fiber (10) tail end is in T
Type glass tube (12) is internal, and is inserted into right end optical fiber ceramic lock pin (11)；Right end polarization maintaining optical fibre (9) tail end is in T-type glass tube
(12) outside and right end internal screw thread seal cap (7) and right end external screw thread seal pipe (8) are passed through, wherein right end air-core photon
Crystal optical fibre (10) tail end is inserted through through-hole by right end optical fiber ceramic lock pin (11) tail end and reaches right end optical fiber ceramic lock pin
(11) top, then a small amount of vacuum compound is injected for fixing in right end optical fiber ceramic lock pin (11) tail end；Fix rear right end
Optical fiber ceramic lock pin (11) is inserted into porcelain bushing (6), and the depth of insertion is right end optical fiber ceramic lock pin (11) top distance ceramics
At casing (6) center about 1-2mm.
2. optical fiber alkali metal gas chamber according to claim 1, it is characterised in that: left end external screw thread seal pipe (2) is closely matched
It closes in T-type glass tube (12) transverse tube left end, left end internal screw thread seal cap (1) fits snugly in left end external screw thread by screw thread and seals
It is external to manage (2)；There are the through-holes of about 2.5mm to allow at left end internal screw thread seal cap (1) and left end external screw thread seal pipe (2) axle center
Left end polarization maintaining optical fibre (3) passes through, and seals through-hole using vacuum compound later；Right end external screw thread seal pipe (7) fits snugly in T
Type glass tube (12) transverse tube right end, right end internal screw thread seal cap (7) fit snugly in right end external screw thread seal pipe (8) by screw thread
It is external；There are the through-holes of about 2.5mm by right end at right end internal screw thread seal cap (7) and right end external screw thread seal pipe (8) axle center
Polarization maintaining optical fibre (9) passes through, and seals through-hole using vacuum compound later.
3. optical fiber alkali metal gas chamber according to claim 1, it is characterised in that: the T-type glass tube (12) is borosilicate glass
Glass material, in order to prevent gas chamber to be corroded when being filled with alkali species.
4. optical fiber alkali metal gas chamber according to claim 1, it is characterised in that: in left end internal screw thread seal cap (1), right end
Thread seal cap (7), right end external screw thread seal pipe (2) and right end external screw thread seal pipe (8) are metallic aluminum material, guarantee structure
Have both low magnetic characteristic again with certain degree of hardness.
5. optical fiber alkali metal gas chamber according to claim 1, it is characterised in that: for sealing left end internal screw thread seal cap
(1), the glue of right end internal screw thread seal cap (7), right end external screw thread seal pipe (2) and right end external screw thread seal pipe (8) is high vacuum
Degree, i.e., 10-6The vacuum sealing glue material of Pa guarantees that gas chamber is isolated with outside air after packaging.
6. optical fiber alkali metal gas chamber according to claim 1, it is characterised in that: for T-type glass tube tool, there are two through-holes
One end be referred to as transverse tube, be referred to as longitudinal tubule (L tubule) perpendicular to one end of transverse tube, longitudinal tubule (L tubule) is being filled for being filled with substance needed for alkali metal
After be sintered sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553839.2A CN109541501B (en) | 2018-12-19 | 2018-12-19 | Optical fiber alkali metal air chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553839.2A CN109541501B (en) | 2018-12-19 | 2018-12-19 | Optical fiber alkali metal air chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109541501A true CN109541501A (en) | 2019-03-29 |
| CN109541501B CN109541501B (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811553839.2A Expired - Fee Related CN109541501B (en) | 2018-12-19 | 2018-12-19 | Optical fiber alkali metal air chamber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261953A (en) * | 2019-06-06 | 2019-09-20 | 武汉工程大学 | A kind of gas packaging system of HC-PCF |
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| CN103066490A (en) * | 2012-12-11 | 2013-04-24 | 华中科技大学 | Optical fiber alkali metal vapor laser |
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| CN103427326A (en) * | 2013-08-29 | 2013-12-04 | 哈尔滨工程大学 | Optical fiber integrated type saturated absorption spectrum device |
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