CN101499606B - THz optical fiber laser - Google Patents
THz optical fiber laser Download PDFInfo
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- CN101499606B CN101499606B CN2009100145067A CN200910014506A CN101499606B CN 101499606 B CN101499606 B CN 101499606B CN 2009100145067 A CN2009100145067 A CN 2009100145067A CN 200910014506 A CN200910014506 A CN 200910014506A CN 101499606 B CN101499606 B CN 101499606B
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- optical fiber
- thz
- laser
- sealing cap
- fiber
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Abstract
The invention discloses a THz optical fiber laser, which comprises a pumping source, a coupling system, an input mirror, an output mirror and a metal coating air-core optical fiber, wherein, the metal coating air-core optical fiber is filled with THz active gas; the front end and the rear end of the optical fiber are provided with sealing caps; the pumping source is a CO2 or N2O laser which operates continuously or operates under radio frequency; the coupling system is an infrared laser lens group coupling system; and the input mirror and the output mirror are both inductive metal grids. In the technical proposal, the low-voltage THz active gas is filled into the metal coating air-core THz optical fiber with low loss to prepare the THz active optical fiber; a thick and heavy quartz tube or a large container is replaced by the THz active optical fiber; the infrared laser pumped optical fiber is used for generating THz waves; and the number of effective paths of the pumping light in theoptical fiber is greatly increased. Compared with the quartz tube or the large container, the optical fibers with the same length have higher efficiency. Moreover, due to the characteristics of lightweight, small volume and flexibility of the optical fiber, the complete set of apparatus is more compact and flexible.
Description
Technical field
The invention belongs to terahertz emission source technology field, be specifically related to a kind of fiber laser.
Background technology
In general, the wavelength of THz ripple is between 0.03mm～1mm, and the correspondent frequency scope is 0.3THz～10THz, is the electromagnetic radiation between millimeter wave and infrared light, is that last needs the wave band of research comprehensively in the electromagnetic spectrum.Because material has comprised abundant physics and chemical information in emission, reflection and the transmitted spectrum of THz wave band, therefore the THz ripple is in basic research fields such as physics, chemistry, astronomy, molecular spectrum, life and medical sciences, and all there are great scientific research value and wide application prospect in application study fields such as medical imaging, environmental monitoring, material tests, food inspection, radio astronomy, mobile communication, satellite communication and military radar.
At present, important basic problem comprises in the THz ripple research field: THz wave radiation source; THz ripple Detection Techniques; THz ripple self character and THz ripple and matter interaction.Wherein, the research to THz wave radiation source is the core research contents of THz technical field development in science and technology.The THz radiation source can be divided into two big classes according to the difference of mechanism of production: based on the THz radiation source of electronics with based on the THz radiation source of optics.THz radiation source based on optics mainly comprises: utilize ultrashort laser pulse to produce the THz radiation; Utilize nonlinear frequency transformation to produce the THz ripple; Produce THz lasing light emitter (being called for short optical pumping THz laser) based on the optical pumping gas molecule.With the immediate technology of the application be common optical pumping THz laser, it is to adopt the gas molecule in the infrared laser pumping generator to produce stimulated radiation formation THz laser, maximum average output power has reached 800mW (wavelength 118 μ m), light-light conversion efficiency is up to 0.727% (M.S.Tobin, A review of opticallypumped NMMW lasers, Proc.IEEE, 73 (1): 61-85,1985), and beam quality is better, and can export continually and steadily, and the maximum at present average output power of other optical means only is the microwatt magnitude, light-light conversion efficiency is less than 0.1%, so optical pumping THz laser is realizing having very big potentiality aspect the high power terahertz emission.What used at the mobile astronomical station of for example, setting up in the South Pole and carrying on satellite all is this optical pumping THz laser.The basic element of this laser is pumping source and THz ripple laser generator, advantage is, the beam quality of output is better, power output is higher, and can export continually and steadily, shortcoming is because THz ripple laser generator adopts thicker quartz ampoule or bulk container, only the length of THz ripple laser generating tube is generally more than 2 meters, diameter is about 30mm～50mm, can not be crooked, be difficult for moving, and the also huger heaviness of its bracing frame, it is very inconvenient to use, and has influenced the practical application area of optical pumping THz wave laser to a certain extent.
In recent years, people have also carried out THz ripple laser generator Miniaturization Research, mainly are that THz wave laser length is shortened, but shorten back THz signal relatively a little less than, do not reach instructions for use, be difficult to extensively promote at sciemtifec and technical sphere.
Summary of the invention
It is better to the purpose of this invention is to provide a kind of output beam quality, and power output is higher, and the THz fiber laser that can export continually and steadily and volume is little.
For achieving the above object, THz fiber laser of the present invention is made up of pumping source, optical fiber, input mirror and outgoing mirror, wherein:
Described optical fiber is coat of metal gaseous core optical fiber, and it is the THz active gases that is filled with certain air pressure at coat of metal hollow-core fiber fibre core, and requiring these active gasess is to absorb near the laser of 10 μ m (such as CO
2Or N
2The O laser) gas of generation THz wave band radiation, as, ammonia NH
3, fluoromethane CH
3F etc. install sealing cap additional in coat of metal gaseous core optical fiber rear and front end, require the sealing cap termination parallel with the termination of coat of metal hollow-core fiber, and preceding sealing cap material has than high permeability infrared laser, as ZnSe or NaCl or BaF
2Wafer, back sealing cap material filtering infrared signal effectively, and the THz ripple is had good permeability, as polytetrafluoroethylene (Teflon) or polyethylene, be used to export THz laser.
Described pumping source is the CO of running continuously or radio frequency running
2Or N
2The O laser adds frequency selective element behind laser, as the rotating metallic grating, can realize the tuning output of THz ripple;
Described input mirror is the inductive metallic mesh, require to pump signal have more than 50% transmitance and the THz signal is had reflectivity more than 85%;
Described outgoing mirror is the inductive metallic mesh, and requiring has the reflectivity more than 30% and the THz signal is had transmitance about 20～30% pump signal.
Operation principle of the present invention is: the input mirror at optical fiber and two ends, outgoing mirror constitute an optical-fiber laser resonant cavity, when the infrared laser of pumping shines, and active gases generation population inversion in the chamber, during transition downwards, emission THz laser, laser vibrates between two chamber mirrors, exports from outgoing mirror.
THz fiber laser of the present invention charges into low pressure THz active gases in low-loss coat of metal gaseous core THz optical fiber, make the THz active fibre, replaces big and heavy quartz ampoule or bulk container, produces the THz ripple with the infrared laser pumping optical fiber.Because optical fiber side is to the reflex of pump light, the active path of pump light in optical fiber increased greatly, compares with quartz ampoule or bulk container, and the optical fiber efficient of equal length is higher, and because optical fiber quality is light, volume is little and flexible characteristic, makes a whole set of instrument compacter, flexible.This THz fiber laser can room temperature running, tunable, good beam quality, conversion efficiency height, can make the THz ripple target location of going directly by optical fiber output, compact, flexible, robust (pronunciation and meaning of robust), portable, the advantage of integrated optical pumping gas molecule laser and all solid state fiber laser is that other terahertz emission source is incomparable.The length of coat of metal gaseous core optical fiber of the present invention can be chosen according to the parameter of optical fiber and the relevant parameter of active gases.Under the certain situation of in-core gas flow, within the specific limits can be by the pressure of temperature controlled optical fiber method of temperature control in-core gas.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the sectional view of coat of metal gaseous core optical fiber of the present invention;
Fig. 3 is sealing cap example structure figure before the coat of metal gaseous core optical fiber of the present invention;
Fig. 4 is the coat of metal gaseous core optical fiber of the present invention aerating device structure chart of bleeding.
Fig. 5 is the bleed assembling schematic diagram in when inflation of coat of metal gaseous core optical fiber of the present invention.
Among the figure: 1-pumping source, 2-THz optical fiber, 3-input mirror, 4-outgoing mirror, the 5-THz ripple, the outer ducting layer of 6-, the 7-coat of metal, 8-gaseous core, the 9-gas container, 10-gas container plastic closures, 11-window, the 12-sealing compound, 13-device cover, 14-erection seat, the 15-O grommet type seal, 16-sealing gasket, 17-flange, the 18-external screw thread, 19-internal thread, 20-plastics interface.
Embodiment
Fig. 1 is a THz optical fiber laser structure schematic diagram of the present invention, and as can be seen from the figure, it comprises pumping source 1, THz optical fiber 2, input mirror 3 and outgoing mirror 4, and the input mirror 3 at THz optical fiber 2 and two ends, outgoing mirror 4 constitute an optical-fiber laser resonant cavity, as the CO of pumping
2Or N
2During the O laser radiation, active gases generation population inversion in the chamber, during transition downwards, emission THz laser, laser vibrates between two chamber mirrors, from outgoing mirror output THz ripple 5.
Among the embodiment, adopt the coat of metal optical fiber of internal diameter 2mm, in fibre core, charge into fluoromethane CH
3F gas charges into behind the gas sealed at both ends.Adopt continuous CO
2Laser pump source 1, pump light is through CO
2Laser lens group coupled system enters optical fiber 2, and laser forms THz laser generation between the input and output mirror.Can record the THz ripple at fiber-optic output, change the pumping light wavelength, obtain tunable THz output wave.
The sectional view of described coat of metal gaseous core optical fiber as shown in Figure 2, skin is outer ducting layer 6, is coated with the Au or the coats of metal such as Ag or Cu 7 in the ducting layer 6 outside, optical fiber middle part is for being filled with CH
3The gaseous core 8 of F gas.
The preceding sealing cap example structure of described coat of metal gaseous core optical fiber as shown in Figure 3, it is that a side at a gas container 9 is provided with the port that inserts optical fiber 2, gas container 9 is selected for use pumping laser is absorbed few ZnSe material; Port is provided with window 11, and window 11 is selected for use CO
2The ZnSe material that the laser height sees through; The opposite side of gas container 9 is provided with the socket that inserts optical fiber, seals with sealing compound 12 behind the insertion optical fiber; The bottom surface of gas container 9 is connected with plastics mouth 10, and plastics mouth 10 is tightly connected with gas container 9; Sealing compound 12 seals optical fiber and preceding sealing cap.
Back sealing cap structure is identical with preceding sealing cap structure, and different is that gas container, plastic closures and window are all selected for use few polytetrafluoroethylene material or the polythene material of THz ripple absorption.
In order to realize finding time, inflate and sealing of coat of metal gaseous core optical fiber, specialized designs the aerating device of bleeding, this apparatus structure is as shown in Figure 4.It is made up of device cover 13, erection seat 14 and flange 17, device cover 13 is provided with internal thread 18, erection seat 14 is provided with the external screw thread 19 that cooperates with internal thread 18, device cover 13 is added with O grommet type seal 15 when being threaded with erection seat 14, erection seat 14 is added with sealing gasket 16 when being connected with flange 17, in addition, be provided with plastics interface 20 on device cover 13, device cover 13 forms air chamber.
Optical fiber is bled, inflated and the operation of carrying out contactless welder is a (see figure 5): at the optical fiber two ends sealing cap shown in Figure 3 is installed, is connected the aerating device of finding time respectively at the two ends of optical fiber then, be communicated with by optical fiber.By the air pressure control optical fiber internal gas pressure of control air chamber, realize bleeding and inflating by air chamber, carry out the contactless welding of laser by the plastics interface on the air chamber 20.Take off the sky aerating device after the welding, make THz optical fiber.Wherein bleed, inflation and contactless welding operation step be:
The first step: earlier sealing gasket 16 and flange 17 are installed on the optical fiber 2;
Second step: preceding sealing cap is loaded onto in optical fiber 2 terminations; With sealing compound 12 optical fiber and preceding sealing cap are tightly connected;
The 3rd step: before will being equipped with the optical fiber 2 of sealing cap be fixed to by flange 17 and sealing gasket 16 find time, aerating device seat 14, flange 17 is pushed down sealing gasket 16, make find time, 14 sealings of aerating device seat;
The 4th step: will find time, aerating device cover 13 by internal thread 19 and external screw thread 18 with find time, aerating device seat 14 is connected, middle usefulness O grommet type seal 15 seals;
The 5th step: the other end of optical fiber connects according to above-mentioned steps that another is found time, aerating device;
The 6th step: two find time, the interface 20 of aerating device is connected respectively to air exhauster and inflator, air is pumped into air pressure just charges into fluoromethane CH when low
3F gas gas is taken out, is filled, and so forth several times, but gassy in the optical fiber then, and the pressure of control gaseous is generally 5～70mtorr (1Torr ≈ 133.322Pa);
The 7th step: see through find time, aerating device cover plastics interface 20, with the method for the contactless welding of laser, with front and back sealing cap gas container plastics mouth welded seal;
The 8th step: lay down the aerating device of bleeding, obtain being filled with the THz optical fiber of required active gases.
Claims (6)
1. a THz fiber laser is characterized in that, it is made up of pumping source, optical fiber, input mirror and outgoing mirror, wherein:
Described optical fiber is coat of metal gaseous core optical fiber, it is to be filled with the THz active gases at coat of metal hollow fibre core, requiring these active gasess is that laser produces the gas of THz wave band radiation near absorbing 10 μ m, install sealing cap additional in coat of metal gaseous core optical fiber rear and front end, the sealing cap termination is parallel with the termination of coat of metal hollow-core fiber, preceding sealing cap material selection is for there being the material than high permeability to infrared laser, back sealing cap material selection is infrared signal in the filtering effectively, and the THz ripple is had the material of good permeability;
Described pumping source is the CO of running continuously or radio frequency running
2Or N
2The O laser;
Described input mirror is the inductive metallic mesh, require to pump signal have more than 50% transmitance and the THz signal is had reflectivity more than 85%;
Described outgoing mirror is the inductive metallic mesh, and requiring has the reflectivity more than 30% and the THz signal had 20～30% transmitance pump signal.
2. THz fiber laser as claimed in claim 1 is characterized in that, at CO
2Be added with the frequency-selecting element behind the laser.
3. THz fiber laser as claimed in claim 1 or 2 is characterized in that, described THz active gases is ammonia NH
3Or fluoromethane CH
3F.
4. THz fiber laser as claimed in claim 1 or 2 is characterized in that, preceding sealing cap material selection ZnSe, NaCl or BaF
2Wafer, back sealing cap material selection polytetrafluoroethylene or polyethylene.
5. aerating device of bleeding that is used for claim 1 or 2 described THz fiber lasers, it is characterized in that, it is made up of device cover (13), erection seat (14) and flange (17), device cover (13) is provided with internal thread (18), erection seat (14) is provided with the external screw thread (19) that cooperates with internal thread (18), device cover (13) is added with O grommet type seal (15) with erection seat (14) when being threaded, erection seat (14) is added with sealing gasket (16) with flange (7) when being connected, be provided with plastics interface (20) on device cover (13), device cover (13) forms air chamber.
6. the method for operation of the aerating device of bleeding as claimed in claim 5 is characterized in that, it carries out successively according to following steps:
The first step: earlier sealing gasket (16) and flange (17) are installed on the optical fiber (2);
Second step: preceding sealing cap is loaded onto in optical fiber (2) termination; With sealing compound (12) optical fiber and preceding sealing cap are tightly connected;
The 3rd step: before will being equipped with the optical fiber (2) of sealing cap be fixed to by flange (17) and sealing gasket (16) find time, aerating device seat (14), flange (17) is pushed down sealing gasket (16), make find time, aerating device seat (14) seals;
The 4th step: will find time, aerating device cover (13) by internal thread (19) and external screw thread (18) with find time, aerating device seat (14) is connected, centre usefulness O grommet type seal (15) seals;
The 5th step: the other end of optical fiber connects according to above-mentioned steps that another is found time, aerating device;
The 6th step: two find time, the interface (20) of aerating device is connected respectively to air exhauster and inflator, air is pumped into air pressure just charges into THz active gases gas when low, take out again, fill again, and so forth several times, but then gassy in the optical fiber, and the pressure of control gaseous;
The 7th step: see through find time, aerating device cover plastics interfaces (20), with the method for the contactless welding of laser, with front and back sealing cap gas container plastics mouth welded seal;
The 8th step: lay down the aerating device of bleeding, obtain being filled with the THz optical fiber of required active gases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100145067A CN101499606B (en) | 2009-02-27 | 2009-02-27 | THz optical fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100145067A CN101499606B (en) | 2009-02-27 | 2009-02-27 | THz optical fiber laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101499606A CN101499606A (en) | 2009-08-05 |
| CN101499606B true CN101499606B (en) | 2010-08-04 |
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|---|---|---|---|
| CN2009100145067A Expired - Fee Related CN101499606B (en) | 2009-02-27 | 2009-02-27 | THz optical fiber laser |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520475A (en) * | 2011-12-30 | 2012-06-27 | 清华大学 | Hollow core fiber for terahertz wave transmission |
| US9178618B2 (en) | 2013-10-22 | 2015-11-03 | Globalfoundries Inc. | Preassembled optoelectronic interconnect structure |
| CN104701713B (en) * | 2015-03-25 | 2018-10-23 | 天津大学 | Photonic crystal fiber THz lasers |
| US9819136B2 (en) * | 2016-01-08 | 2017-11-14 | Cymer, Llc | Gas mixture control in a gas discharge light source |
| CN106253030B (en) * | 2016-09-30 | 2019-05-21 | 西安交通大学 | Hollow laser plasma generates the device and method of tunable terahertz emission |
| KR102506045B1 (en) * | 2021-08-26 | 2023-03-07 | 힐랩 주식회사 | High-power laser beam transmission device using index matching fluid |
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| CN101499606A (en) | 2009-08-05 |
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