CN110289540A - A kind of cladding pumping mono-mode terahertz light fibre laser - Google Patents
A kind of cladding pumping mono-mode terahertz light fibre laser Download PDFInfo
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- CN110289540A CN110289540A CN201910649300.5A CN201910649300A CN110289540A CN 110289540 A CN110289540 A CN 110289540A CN 201910649300 A CN201910649300 A CN 201910649300A CN 110289540 A CN110289540 A CN 110289540A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The present invention discloses a kind of cladding pumping mono-mode terahertz light fibre laser, including continuously adjustable carbon dioxide laser, zinc selenide convex lens, zinc selenide concavees lens, middle infrared hollow optical fiber, the gold-plated reflecting mirror of the copper with centrifugal hole, the combined type single mode Terahertz hollow-core fiber, gold-plated quartz crystal outgoing mirror set gradually；Middle infrared hollow optical fiber both ends are connected with fiber adapter respectively；Both ends meet vacuum room I and vacuum room II respectively after single mode Terahertz hollow-core fiber is connected with fiber adapter, the gold-plated reflecting mirror of copper with centrifugal hole is encapsulated in inside vacuum room I by flange, and gold-plated quartz crystal outgoing mirror is encapsulated in inside vacuum room II by flange.There are also pumped vacuum systems to be attached between vacuum room I and vacuum room II, and carries out pressure control using vacuum valve I and vacuum valve II.That the present invention overcomes general optical pumping thz laser devices is bulky, beam quality is lower, it is difficult to the shortcomings that realizing the output of high power single mode Terahertz.
Description
Technical field
The present invention relates to thz laser device technical fields, swash more particularly to a kind of cladding pumping mono-mode Hz optical fiber
Light device.
Background technique
THz wave refer to frequency in the electromagnetic wave of 0.1~10THz, with it is many it is unique a little, such as can wear
Saturating nonmetallic materials and non-polarized substance, and there is extremely low photon energy, therefore be widely used in medical imaging, safety inspection
Look into, environmental monitoring, atmospheric remote sensing and basic physics research etc. fields.Current research personnel have now been developed a variety of Terahertz spokes
Penetrate source, but most of working environment for requiring harshness or high operating cost.Optical pumping thz laser device is because of its output
Power is high, can at room temperature long-term stable work and be concerned, and its shortcoming is that equipment volume is huge, and pumps and swash
The energy conversion efficiency of light is lower, therefore it is most important to obtain small size, the optical pumping thz laser device of high-energy conversion efficiency.
In recent years, with the development of antiresonance hollow-core fiber and the proposition of a variety of low-loss Terahertz materials, research
Personnel start to propose the terahertz light fibre laser based on hollow-core fiber, but generally select be end pumping mode,
Due to lacking the light-splitting device of infrared/terahertz wave band in efficient, the terahertz light fibre laser of end pumping still needs to use
Small aperture coupling inputs mirror, causes Terahertz resonant cavity that can not seriously affect the defeated of thz laser in optimum resonant state
Power and beam quality out, and the thz laser generated is understood some and is lost by pumping the aperture of light input end.
In addition, it is few research in view of thz laser output unimodular properties, this be also one influence beam quality it is important because
Element.It is therefore proposed that a kind of single mode terahertz light fibre laser of cladding pumping is of great significance.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of single mode terahertz light of cladding pumping
Fibre laser.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of cladding pumping mono-mode terahertz light fibre laser, including set gradually laser, convex lens, concavees lens,
Middle infrared hollow optical fiber, reflecting mirror, single mode Terahertz hollow-core fiber and outgoing mirror；The reflecting mirror is the copper plating with centrifugal hole
Golden reflecting mirror, the middle infrared hollow optical fiber both ends are connected with fiber adapter I and fiber adapter II respectively；It is described anti-
It penetrates mirror and outgoing mirror and passes through flange respectively and be packaged in vacuum room I and vacuum room II, the two sides difference of the vacuum room I
It is connected with fiber adapter II and fiber adapter III, fiber adapter IV, the single mode terahertz are connected on vacuum room II
Hereby the both ends of hollow-core fiber are connected with fiber adapter III and fiber adapter IV respectively；The vacuum room I and vacuum gas
It is interconnected between the II of room by connecting tube and is connect with pumped vacuum systems, the connecting tube is equipped with for the true of control pressure
Empty valve I and vacuum valve II；Working gas is vacuumized and is filled with by vacuum valve I and vacuum valve II；
Seven big covering thin-wall tube is provided in the single mode Terahertz hollow-core fiber, in one of them big covering thin-wall tube
There are six small covering thin-wall tubes for setting；
The pump light that laser generates is coupled into middle infrared hollow optical fiber after convex lens and concavees lens pack, in
Infrared hollow optical fiber utilizes antiresonance effect low-loss transmission pump light, will pump via fiber adapter I and fiber adapter II
Pu light is introduced into vacuum room I, and pump light enters the small covering of single mode Terahertz hollow-core fiber by the centrifugal hole of reflecting mirror
In thin-wall tube, single mode Terahertz hollow-core fiber can realize the low-loss transmission to pump light and thz laser, and pump light is in list
It is reacted in mould Terahertz hollow-core fiber with working gas and generates thz laser lasing, and is defeated under the action of big covering thin-wall tube
Single mode thz laser out.
Further, the laser is the carbon dioxide laser of continuously adjustable, the convex lens and concavees lens point
It Wei not zinc selenide convex lens and zinc selenide concavees lens.
Further, the outgoing mirror is gold-plated quartz crystal outgoing mirror.
Further, the diameter of the centrifugal hole of reflecting mirror is equal to the fibre of small covering thin-wall tube in single mode Terahertz hollow-core fiber
Core diameter, and keep concentric installation.
Further, the hollow-core fiber that middle infrared hollow optical fiber is made of seven covering thin-wall tubes, seven covering thin-walleds
Core diameter is formed between pipe, the outer diameter and core diameter ratio of covering thin-wall tube are 0.7:1.
Further, it is formed with big core diameter in single mode Terahertz hollow-core fiber between seven big covering thin-wall tube, six
Small core diameter is formed between a small covering thin-wall tube, big covering OD of Thin Wall Welded Pipe and big core diameter ratio are 0.7:1；It is small
Side in covering thin-wall tube close to big core diameter is provided with thin-wall tube area of absence, and the thin-walled of thin-wall tube area of absence
Thickness when with a thickness of pumping optical resonance.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. the present invention is using infrared hollow optical fiber in sulfide material production, sulfide material is to carbon dioxide laser wave band
Absorption loss it is smaller, the middle infrared hollow optical fiber of setting can reduce its limitation loss, and while reducing Space Coupling is produced
Raw loss.
2. the single mode Terahertz hollow-core fiber structure designed in the present invention, is gradually let out from covering using carbon dioxide laser
The mode for draining to fibre core is pumped, and is overcome when pump light is directly entered optical fiber by end face and is easy to damage optical fiber and is difficult to obtain
The problem of high power thz laser exports.In addition, fiber optic materials can be used instead using this structure such as cyclic olefine copolymer, poly- four
The polymer such as vinyl fluoride can realize that thz laser exports in the case of small pump power while not damaging optical fiber.
4. the position for the reflecting mirror centrifugal hole that the present invention is arranged can just make pump light, therefrom infrared hollow optical fiber is coupled into
Enter in a covering of single mode Terahertz hollow-core fiber, the thz laser vibrated in fibre core will not be generated because of reflecting mirror aperture
Loss.
5. the gold-plated quartz crystal outgoing mirror that the present invention is arranged utilizes and plates center band on complete quartz crystal eyeglass
The golden film of aperture, improves the utilization rate of pump light, and output end only needs an eyeglass to can be achieved with the output of thz laser.
6. cladding pumping mono-mode terahertz light fibre laser proposed by the present invention, can not only reduce optical pumping thz laser
The volume of device improves beam quality, and can be realized effective realization single mode thz laser output.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cladding pumping mono-mode terahertz light fibre laser of the present invention.
Fig. 2 is coupling pump light input process schematic diagram inside vacuum room I.
Fig. 3 is the cross-sectional structure schematic diagram of single mode Terahertz hollow-core fiber.
Fig. 4 is the mould field schematic diagram of carbon dioxide laser leakage process in single mode Terahertz hollow-core fiber.
Fig. 5 is mould field schematic diagram of the THz wave when single mode Terahertz hollow-core fiber works.
Appended drawing reference: 1- laser, 2- convex lens, 3- concavees lens, infrared hollow optical fiber in 4-, 5- reflecting mirror, 6- single mode
Terahertz hollow-core fiber, 7- outgoing mirror, 8- fiber adapter I, 9- fiber adapter II, 10- vacuum room I, 11- fiber adapters
Device III, 12- fiber adapter IV, 13- vacuum valve I, 14, vacuum valve II, 15- vacuum room II, 16- single mode Terahertz
Hollow-core fiber outer diameter, the big core diameter of 17-, the small core diameter of 18-, the small covering thin-wall tube thickness of 19-, the big covering thin-wall tube of 20-
The thin-walled of internal diameter, the big covering OD of Thin Wall Welded Pipe of 21-, 22- single mode Terahertz hollow-core fiber internal diameter, 23- thin-wall tube area of absence is thick
Degree.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific examples are only used to explain the present invention, is not intended to limit the present invention.
The cladding pumping mono-mode terahertz light fibre laser of the present embodiment as shown in Figure 1, continuously adjustable carbon dioxide
The pumping laser that the exportable central wavelength of laser 1 is 9.69 μm.First with zinc selenide convex lens 2 and zinc selenide concavees lens 3
The light beam of pumping laser is controlled, the spot size of pumping laser is reduced, can preferably with fiber adapter I8
Coupled hence into the intermediate core region to middle infrared hollow optical fiber 4, pump light in middle infrared hollow optical fiber 4 due to
Antiresonance effect is able to carry out low-loss transmission.By fiber adapter II9, fiber adapter III11, fiber adapter IV12
It is connect respectively with vacuum room I10, vacuum room II15 as shown in Figure 1, and carries out encapsulation process.Using vacuum valve I13 and
Vacuum valve II14 is vacuumized and is filled with methanol gas, and methanol gas can enter middle infrared hollow optical fiber 4 and single mode too
The inside of hertz hollow-core fiber 6, and controlled in vacuum room and single mode Terahertz hollow-core fiber by adjusting vacuum valve
The pressure in portion.Pump light with the gold-plated reflecting mirror 5 of copper of centrifugal hole by entering in vacuum room I, and by band when installing
There are the aperture of the gold-plated reflecting mirror of the copper of centrifugal hole and fibre core in the small covering thin-wall tube of single mode Terahertz hollow-core fiber 6 concentric,
Coupling pump light process is as shown in Figure 2.Pump light passes through resonance effect in the small covering thin-wall tube of single mode Terahertz hollow-core fiber
It is leaked in the fibre core of single mode Terahertz hollow-core fiber 6.Pump light divides methanol in the fibre core of single mode Terahertz hollow-core fiber 6
Son is pumped into vibration excited state by vibration ground state, and it is 118.8 μ that transition generation wavelength is carried out between the rotational energy level in vibration excited state
The thz laser of m, and single mode thz laser is obtained under the action of big covering thin-wall tube, finally by gold-plated quartz crystal
Outgoing mirror 7 is exported.
See Fig. 3, in the present embodiment, seven big covering thin-wall tube is provided in single mode Terahertz hollow-core fiber 6, one of them
There are six small covering thin-wall tubes for setting in big covering thin-wall tube；It is formed with big core diameter 17 between seven big covering thin-wall tube,
Small core diameter 18 is formed between six small covering thin-wall tube, big covering OD of Thin Wall Welded Pipe 21 is with big 17 ratio of core diameter
0.7:1；Side in small covering thin-wall tube close to big core diameter 17 is provided with thin-wall tube area of absence, and thin-wall tube vacancy
The walled thickness 23 in region is thickness when pumping optical resonance.
Specifically, single mode Terahertz hollow-core fiber outer diameter 16 is 10mm in the present embodiment, in single mode Terahertz hollow-core fiber
Diameter 22 is 7mm, and big core diameter 17 is 3mm, and big covering OD of Thin Wall Welded Pipe 21 is 2mm, and big covering thin-walled bore 20 is
1.93mm, small core diameter 18 are 1mm, and small covering thin-wall tube thickness 19 is 35 μm, the walled thickness 23 of thin-wall tube area of absence
It is 32 μm.
See Fig. 4, the carbon dioxide laser transmitted in single mode Terahertz hollow-core fiber 6 in this example is due to covering thin-wall tube
The resonance effect of area of absence leaks into fibre core, and the mode that carbon dioxide laser gradually leaks out fibre core does not allow easy damaged light
Fibre, to obtain high-power thz laser output.
See Fig. 5, the size of big covering thin-wall tube setting is made by antiresonance in single mode Terahertz hollow-core fiber 6 in this example
It is transmitted in fiber core with the Terahertz mould field that limitation generates, improves thz laser beam quality and unimodular property.
It is said although aforementioned present invention has carried out experiment just for the pumping optical pumping methanol gas that output wavelength is 9.69 μm
It is bright, do not indicate that this method is only suitable for the experiment of optical pumping methanol gas, the method is for the pumping laser of other wavelength and other
Polar gas molecule is equally applicable.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (6)
1. a kind of cladding pumping mono-mode terahertz light fibre laser, which is characterized in that including set gradually laser, convex lens
Mirror, concavees lens, middle infrared hollow optical fiber, reflecting mirror, single mode Terahertz hollow-core fiber and outgoing mirror；The reflecting mirror be with from
The gold-plated reflecting mirror of the copper in heart hole, the middle infrared hollow optical fiber both ends respectively with fiber adapter I and fiber adapter II phase
Connection；The reflecting mirror and outgoing mirror pass through flange respectively and are packaged in vacuum room I and vacuum room II, the vacuum room
The two sides of I are connected separately with fiber adapter II and fiber adapter III, and fiber adapter IV is connected on vacuum room II,
The both ends of the single mode Terahertz hollow-core fiber are connected with fiber adapter III and fiber adapter IV respectively；The vacuum
It is interconnected between gas chamber I and vacuum room II by connecting tube and is connect with pumped vacuum systems, the connecting tube, which is equipped with, to be used
In the vacuum valve I and vacuum valve II of control pressure；Work is vacuumized and is filled with by vacuum valve I and vacuum valve II
Use gas；
Seven big covering thin-wall tube, setting in one of them big covering thin-wall tube are provided in the single mode Terahertz hollow-core fiber
There are six small covering thin-wall tubes；
Laser generate pump light after convex lens and concavees lens pack, be coupled into middle infrared hollow optical fiber, in it is infrared
Hollow-core fiber utilizes antiresonance effect low-loss transmission pump light, via fiber adapter I and fiber adapter II by pump light
It is introduced into vacuum room I, pump light enters the small covering thin-walled of single mode Terahertz hollow-core fiber by the centrifugal hole of reflecting mirror
Guan Zhong, single mode Terahertz hollow-core fiber can realize the low-loss transmission to pump light and thz laser, pump light single mode too
It is reacted in hertz hollow-core fiber with working gas and generates thz laser lasing, and export list under the action of big covering thin-wall tube
Mould thz laser.
2. a kind of cladding pumping mono-mode terahertz light fibre laser according to claim 1, which is characterized in that the laser
For the carbon dioxide laser of continuously adjustable, the convex lens and concavees lens are respectively that zinc selenide convex lens and zinc selenide are recessed
Mirror.
3. a kind of cladding pumping mono-mode terahertz light fibre laser according to claim 1, which is characterized in that the outgoing mirror
For gold-plated quartz crystal outgoing mirror.
4. a kind of cladding pumping mono-mode terahertz light fibre laser according to claim 1, which is characterized in that reflecting mirror from
The diameter in heart hole is equal to the core diameter of small covering thin-wall tube in single mode Terahertz hollow-core fiber, and keeps concentric installation.
5. cladding pumping mono-mode terahertz light fibre laser according to claim 1, which is characterized in that in infrared hollow light
The hollow-core fiber that fibre is made of seven covering thin-wall tubes is formed with core diameter, covering thin-walled between seven covering thin-wall tubes
The outer diameter and core diameter ratio of pipe are 0.7:1.
6. cladding pumping mono-mode terahertz light fibre laser according to claim 1, which is characterized in that single mode Terahertz is empty
It is formed with big core diameter between seven big covering thin-wall tube in core fibre, is formed with small fibre core between six small covering thin-wall tube
Diameter, big covering OD of Thin Wall Welded Pipe and big core diameter ratio are 0.7:1；Close to the one of big core diameter in small covering thin-wall tube
Side is provided with thin-wall tube area of absence, and the walled thickness of thin-wall tube area of absence is thickness when pumping optical resonance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910649300.5A CN110289540A (en) | 2019-07-18 | 2019-07-18 | A kind of cladding pumping mono-mode terahertz light fibre laser |
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| CN201910649300.5A CN110289540A (en) | 2019-07-18 | 2019-07-18 | A kind of cladding pumping mono-mode terahertz light fibre laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206443A (en) * | 2021-04-26 | 2021-08-03 | 武汉大学 | Terahertz gas laser |
| CN113777722A (en) * | 2021-04-16 | 2021-12-10 | 北京工业大学 | Intermediate infrared laser transmission system based on hollow anti-resonance optical fiber |
| WO2022143527A1 (en) * | 2020-12-30 | 2022-07-07 | 武汉大学 | Terahertz fiber laser device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022143527A1 (en) * | 2020-12-30 | 2022-07-07 | 武汉大学 | Terahertz fiber laser device |
| CN113777722A (en) * | 2021-04-16 | 2021-12-10 | 北京工业大学 | Intermediate infrared laser transmission system based on hollow anti-resonance optical fiber |
| CN113206443A (en) * | 2021-04-26 | 2021-08-03 | 武汉大学 | Terahertz gas laser |
| CN113206443B (en) * | 2021-04-26 | 2022-06-03 | 武汉大学 | Terahertz gas laser |
| WO2022228153A1 (en) * | 2021-04-26 | 2022-11-03 | 武汉大学 | Terahertz gas laser |
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