CN205646423U - 4 full fiber laser of~8 mu m pulse ramans - Google Patents
4 full fiber laser of~8 mu m pulse ramans Download PDFInfo
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- CN205646423U CN205646423U CN201620331486.1U CN201620331486U CN205646423U CN 205646423 U CN205646423 U CN 205646423U CN 201620331486 U CN201620331486 U CN 201620331486U CN 205646423 U CN205646423 U CN 205646423U
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Abstract
The utility model discloses a 4 full fiber laser of~8 mu m pulse ramans belongs to the laser instrument field. The utility model discloses a 4 full fiber laser of~8 mu m pulse ramans, including the light source that the order is connected, gain fibre no. 1 and gain fibre no. 2, be equipped with first resonant cavity and second resonant cavity on the gain fibre no. 1, be equipped with multistage stokes optical cavity on the gain fibre no. 2, first resonant cavity overlaps with second resonant cavity part, in the second resonant cavity with first resonant cavity not mutually overlapping department be equipped with pulse switch. The utility model discloses a high efficiency realized the pulse of 4 mu m mid irs accent Q under 4 full fiber laser of~8 mu m pulse ramans had normal atmospheric temperature to and Q pulsed laser is transferred to the raman more than the 4 mu m, can greatly reduced lasing threshold, improve output efficiency, and the reduce cost loss is less, and is easily integrated, does benefit to practical application, realizes the characteristics of the high -efficient output of 3.9 mu m laser under non - cooling room temperature condition.
Description
Technical field
This utility model relates to a kind of laser instrument, particularly a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers.
Background technology
The laser of middle-infrared band widely should owing to having in fields such as atmospheric communication, industry, national defence, medical treatment, chemistry
With and favored by numerous researchers.Comparing with gas laser relative to conventional solid, optical fiber laser has low threshold
Value, good beam quality, high conversion efficiency；Meanwhile, the optical fiber as gain media has the advantages that pliability is good, be easily integrated,
Its high surface area-to-volume ratio is beneficial to heat radiation.And mid-infrared Q-switched pulse laser is in industrial processes, laser micro-hurt operation, non-thread
Property the aspect such as wavelength convert, laser countermeasure (s) there is irreplaceable important application, therefore development mid-infrared pulse optical fiber
There is important scientific meaning and using value.
In recent years, the mid-infrared pulse optical fiber of 2 μm and 3 mu m wavebands achieves more progress, longer wave band
Can be realized by Raman effect.Raman fiber lasers utilizes the non-linear stimulated raman scattering in optical fiber to produce this
Lentor light, the laser output of long wavelength can be realized by Higher-order Raman effect.In recent years, in middle-infrared band, in red
The research group surely belonging to Université Laval of Canada that the research of outer Raman fiber lasers is relatively more active, at report in recent years
In, the long wavelength (3.77 μm) that they are obtained is to use 3 mu m wavebands to mix Er fluoride ZBLAN optical fiber as pumping source, adopts
With passive chalcogenide fiber as nonlinear dielectric, although obtain continuous Raman laser and export, but output and slope
Efficiency is the most relatively low.Domestic research in this regard relatively lags behind, and is also only limitted to simulation stage.
Utility model content
Utility model purpose of the present utility model is: for the problem of above-mentioned existence, it is provided that high efficiency under a kind of room temperature
Realize 4 μm mid-infrared Q impulses, and 4 μm above Raman adjusting Q pulse laser, it is possible to be substantially reduced laser threshold, improve output
Efficiency, reduces cost loss less, it is easy to integrated, is beneficial to reality application, it is achieved 3.9 μm laser are high under non-cooled room temperature condition
4 ~ 8 μm pulse Raman full-optical-fiber lasers of effect output.
The technical solution adopted in the utility model is as follows:
This utility model one 4 ~ 8 μm pulse Raman full-optical-fiber laser, including the light source being linked in sequence, gain fibre one
With gain fibre two, described gain fibre one is provided with the first resonator cavity and the second resonator cavity, and described gain fibre two is provided with
Multistage Stokes resonator cavity, described first resonator cavity and the second resonator cavity partly overlap, with first in described second resonator cavity
It is provided with pulse switch at resonator cavity non-overlapping.
Owing to have employed technique scheme, light sends from light source, through gain fibre one, repeatedly shakes at the first resonator cavity
Swing gain, form the laser of 1.2 μm；In the second resonator cavity, due to the existence of saturable absorber, first in the second resonator cavity
First being in a low reactance-resistance ratio state, particle energy transition is also accumulated in5I5Energy level, when the energy of laser reaches pulse switch threshold value
Time, pulse switch is opened, and the Q-value moment in the second resonator cavity improves, and is accumulated in5I5Particle on energy level is just with snowslide
Form transits to lower energy level, exports a giant-pulse, and energy release afterpulse switch cuts out, and intracavity Q-value is die-offed, and produces and so forth
Raw efficient 3.9 μm adjust the output of Q giant-pulse.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described first resonator cavity is positioned at the second resonance
Intracavity, described pulse switch is arranged at distance light source in the second resonator cavity.
Owing to have employed technique scheme, the first resonator cavity is placed in the second resonator cavity, defeated by 1.2 μm laser cascade connections
Go out 3.9 μm laser and can be effectively improved 3.9 μm laser delivery efficiencies, be substantially reduced the heat that system produces simultaneously, rational in infrastructure, contracting
Little laser instrument volume, it is simple to the integrated application of laser instrument.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described first resonator cavity includes the second laser
High reflective grid and the high reflective grid of the 3rd laser, described second resonator cavity includes the high reflective grid of the first laser and the 4th laser semi reflective
Grid.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described gain fibre one is disposed with
The high reflective grid of first laser, the high reflective grid of the second laser, the high reflective grid of the 3rd laser, pulse switch and the 4th laser semi reflective
Grid, the high reflective grid of described first laser are arranged at the dipped beam source of gain fibre one.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, the high reflective grid of described first laser are to 3.9 μm
The reflectance of laser > 95%, the high reflective grid reflectance to 1.2 μm laser of described second laser > 95%, described 3rd laser is high anti-
The grating reflectance to 1.2 μm laser > 90%, described 4th laser semi reflective grid are 40% ~ 60% to the reflectance of 3.9 μm laser.
Owing to have employed technique scheme, 1.2 μm fiber gratings form the first resonator cavity, 3.9 μm fiber gratings in pairs
Form the second resonator cavity in pairs.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described pulse switch is Graphene Q-switch,
Described Graphene Q-switch is automatically opened or closed according to laser energy.
Graphene Q-switch being that the form using evanescent wave is coated on optical fiber side, or can use optical fiber tail-end evaporation
And the mode using tail end to dock is inserted in resonator cavity.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described multistage Stokes resonator cavity includes
The some first high anti-fiber gratings being linked in sequence, a semi reflective fibre grating and some second high anti-fiber gratings.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described first high anti-fiber grating the corresponding 1st
~ n rank raman laser, the reflectance of described first high anti-fiber grating > 95%；Described semi reflective fibre grating correspondence n-th order Raman swashs
Light, the reflectance of described semi reflective fibre grating is 40% ~ 60%；Corresponding 1st ~ (n-1) the rank Raman of described second high anti-fiber grating
Laser, the reflectance of described second high anti-fiber grating > 95%, n is natural number.
Owing to have employed technique scheme, 3.9 μm Q impulses transmit to gain fibre two, inscribe in gain fibre two
On grating FBGo1~FBGonWith FBGi1 ~FBGinIn n be natural number, and n takes 1,2,3 ... n-1, n.FBGonWith FBGin
Reflection wavelength both correspond to the centre wavelength of n-th order stokes light, and the light for centre wavelength has higher reflection
Rate (> 95%), have only when n takes maximum (top step number of stokes light), for FBGonReflection wavelength corresponding to n-th
The centre wavelength of rank stokes light, reflectance is 40% ~ 60%, as the outfan of n-th order stokes light.Such as, n=4 is worked as
Time, each rank stokes light in the forming process of intracavity is: 3.9 μm pulse lasers transmit in chalcogenide fiber, produce spontaneous
Raman scattering, when the 3.9 μm pulse lasers injected reach single order Raman threshold power, just produces the single order that wavelength is 4.5 μm
Stokes light, and by FBGi1With FBGo1As producing second order 5.3 μm stoke after in the resonator cavity of composition, vibration strengthens
The pump light of this light and by Raman fiber re-absorption, its two grades of stokes lights excited are at second level Fiber Bragg Grating FBG pair
In the resonator cavity constituted, vibration strengthens.So on, if the Stokes luminous power of front single order can reach to produce lower single order this
The Raman threshold power of lentor light, the vibration of the most this cascade just can be sustained, and the stokes light on every rank
All vibrate in corresponding Fiber Bragg Grating FBG is to the resonator cavity of composition.Three rank, the wavelength of quadravalence stokes light are respectively
6.5 μm、8.3 μm.The outfan FBG of n-th order stokes lightonIt is had a partial reflectance (40% ~ 60%), such n-th
Contrast Q stokes light just exports from this outfan, it is achieved the tune Q raman laser output of 4 ~ 8 μm and longer middle infrared wavelength.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described gain fibre one is for mixing Ho fluoride
ABLAN optical fiber, described gain fibre two is passive chalcogenide fiber.
A kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers of the present utility model, described light source is 885nm laser diode
Source, Pu.
Owing to have employed technique scheme, take the passive sulfuration mated with the fluoride fiber size selected by pumping source
Inscribe multistage fiber grating pair, the method taking fiber end face welding on object light fibre, and choose the not same fiber that size is mated,
Greatly reduce loss, more conducively the system integration.
Ho fluoride fiber is as gain fibre, and dual wavelength (1.2 μm, 3.9 μm) the optical fiber Bradley of write cascade wherein
Lattice grating pair, by Ho ion energy level transition5I6→5I8The 1.2 μm laser outputs produced empty5I6Particle collection on energy level
Poly-, it is effectively improved5I5With5I6The number of ions reversion of two energy levels, is substantially reduced 3.9 μm laser thresholds, improves delivery efficiency, significantly
Reduce the heat that multi-phonon relaxation produces.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
1, can under non-brake method room temperature efficiently, stable, continuous print obtain 3.9 μm laser, it is achieved 4 ~ 8 μm adjust Q raman lasers
Output, shorter for solving currently available technology middle infrared laser wavelength, practicality is not strong, and the problems such as efficiency is low, and power is low carry
Supply effective solution.
2, mid-infrared all optical fibre structure is used, reasonable in design, simple in construction, it is easy to integrated and actual application, abandon existing
High request to coupled lens, dichroscope etc. in technology, greatly reduces loss and cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers.
Labelling in figure: 1 is light source, 2 is fusion point one, and 3 is the high reflective grid of the first laser, and 4 is the high reflective grid of the second laser,
5 is gain fibre one, and 6 is the high reflective grid of the 3rd laser, and 7 is pulse switch, and 8 is the 4th laser semi reflective grid, and 9 is fusion point
Two, 10 is the first high anti-fiber grating, and 11 is gain fibre two, and 12 is semi reflective fibre grating, and 13 is the second high anti-fiber grating.
Detailed description of the invention
Below in conjunction with the accompanying drawings, this utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain
This utility model, is not used to limit this utility model.
As it is shown in figure 1, a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers, including the light source 1 being linked in sequence, gain fibre
One 5 and gain fibre 2 11, gain fibre 1 is provided with the first resonator cavity and the second resonator cavity, and gain fibre 25 is provided with many
Rank Stokes resonator cavity, the first resonator cavity and the second resonator cavity partly overlap, with the first resonator cavity in described second resonator cavity
Pulse switch 7 it is provided with at non-overlapping.First resonator cavity is positioned at the second resonator cavity, and pulse switch 7 is arranged at the second resonator cavity
Interior distance light source.First resonator cavity includes the high reflective grid 4 of the second laser and the high reflective grid 6 of the 3rd laser, and the second resonator cavity includes
The high reflective grid 3 of first laser and the 4th laser semi reflective grid 8.The high reflective grid of the first laser it are disposed with on gain fibre 1
3, the high reflective grid 4 of the second laser, the high reflective grid 6 of the 3rd laser, pulse switch 7 and the 4th laser semi reflective grid 8, the first laser is high
Reflective grid 3 are arranged at the dipped beam source of gain fibre 1.The high reflective grid 3 reflectance to 3.9 μm laser of first laser > 95%,
The high reflective grid 4 reflectance to 1.2 μm laser of second laser > 95%, the high reflective grid 6 reflectance to 1.2 μm laser of the 3rd laser
> 90%, the 4th laser semi reflective grid are 40% ~ 60% to the reflectance of 3.9 μm laser.Pulse switch 7 is Graphene Q-switch, graphite
Alkene Q-switch is automatically opened or closed according to laser energy.Multistage Stokes resonator cavity includes that be linked in sequence some first is high
Anti-fiber grating 10, a semi reflective fibre grating 12 and some second high anti-fiber gratings 13.First high anti-fiber grating 10 is right
Answer the 1st ~ 4 rank raman laser, the reflectance of the first high anti-fiber grating 10 > 95%；The corresponding 4th rank Raman of semi reflective fibre grating 12
Laser, the reflectance of semi reflective fibre grating 12 is 40% ~ 60%；Corresponding 1st ~ 3 rank raman laser of second high anti-fiber grating 13, the
The reflectance of two high anti-fiber gratings 13 > 95%, 3.9 μm pulse lasers transmit in chalcogenide fiber, produce spontaneous Raman and dissipate
Penetrate, when the 3.9 μm pulse lasers injected reach single order Raman threshold power, just produce the single order stoke that wavelength is 4.5 μm
This light, and by FBGi1With FBGo1As producing second order 5.3 μm stokes light after in the resonator cavity of composition, vibration strengthens
Pump light and by Raman fiber re-absorption, its two grades of stokes lights excited at second level Fiber Bragg Grating FBG to constituting
In resonator cavity, vibration strengthens.So on, as long as the Stokes luminous power of front single order can reach to produce lower single order Stokes
The Raman threshold power of light, the vibration of the most this cascade just can be sustained, and the stokes light on every rank is all in phase
The Fiber Bragg Grating FBG answered vibrates in the resonator cavity of composition.Three rank, the wavelength of quadravalence stokes light be respectively 6.5 μm,
8.3 μm.By changing the value of n, can change the frequency of output light, output light exports from the tail optical fiber of gain fibre 2 11, increases
The tail optical fiber of benefit optical fiber 2 11 is fusible is connected to light source follower.Gain fibre 1 mixes Ho fluoride ABLAN optical fiber for double clad, increases
Benefit optical fiber 2 11 is passive chalcogenide fiber, and light source is 885nm pumping source, for 855nm laser diode, the tail of laser diode
Fine outfan links together by the way of end face welding with mixing Ho fluoride ABLAN optical fiber front end, forms welding junction point
One 2, fiber grating 3,4,6,8,10,12,13 is all to inscribe on optical fiber by the way of inscription, fluoride fiber size and work
For the passive chalcogenide fiber size of Raman gain optical fiber to coupling, it is possible to reduce splice loss, splice attenuation, gain light to greatest extent
1 and gain light 2 11 be welded together formation fusion point 29,.
Although the technical program having been carried out when the present embodiment is only 4 with n value detailed explanation, but this area being general
The change of the logical span that artisan will recognize that n will be apparent to the person skilled in the art also
As long as and have chosen the optical maser wavelength that suitable material (each rank stokes light is had relatively low-loss) can obtain as required
N is carried out value, thus realizes the selection to output pulse wavelength.Therefore the protection domain of this utility model application should not be subject to
The restriction of the present embodiment n=4.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (9)
1. a μm pulse Raman full-optical-fiber laser, it is characterised in that: include the light source (1) being linked in sequence, gain fibre
One (5) and gain fibre two (11), described gain fibre one (5) is provided with the first resonator cavity and the second resonator cavity, described gain
Optical fiber two (5) is provided with multistage Stokes resonator cavity, and described first resonator cavity and the second resonator cavity partly overlap, and described second
It is provided with pulse switch (7) with at the first resonator cavity non-overlapping in resonator cavity.
2. a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 1, it is characterised in that: described first resonance
Chamber is positioned at the second resonator cavity, and described pulse switch (7) is arranged at distance light source in the second resonator cavity.
3. 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 1 or 2 a kind of, it is characterised in that: described first humorous
The chamber that shakes includes the second high reflective grid of laser (4) and the high reflective grid (6) of the 3rd laser, and described second resonator cavity includes the first laser height
Reflective grid (3) and the 4th laser semi reflective grid (8).
4. a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 3, it is characterised in that: described gain fibre
The the first laser reflective grid of height (3) it is disposed with on one (5), the high reflective grid (4) of the second laser, the high reflective grid (6) of the 3rd laser,
Pulse switch (7) and the 4th laser semi reflective grid (8), the high reflective grid (3) of described first laser are arranged at gain fibre one (5)
Dipped beam source.
5. a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 4, it is characterised in that: described first laser
The high reflective grid (3) reflectance to 3.9 μm laser > 95%, the described second laser high reflective grid (4) reflectance to 1.2 μm laser
> 95%, the described 3rd laser high reflective grid (6) reflectance to 1.2 μm laser > 90%, described 4th laser semi reflective grid are to 3.9
The reflectance of μm laser is 40% ~ 60%.
6. one 4 ~ 8 μm pulse Raman full-optical-fiber laser as described in claim 1 or 2 or 4 or 5, it is characterised in that: described
Pulse switch (7) is Graphene Q-switch, and described Graphene Q-switch is automatically opened or closed according to laser energy.
7. a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 6, it is characterised in that: described this torr multistage
Gram this resonator cavity includes the some first high anti-fiber gratings (10) being linked in sequence, semi reflective fibre grating (12) and some
Two high anti-fiber gratings (13).
8. a kind of 4 ~ 8 μm pulse Raman full-optical-fiber lasers as claimed in claim 7, it is characterised in that: described first is high anti-
Fiber grating (10) corresponding 1 ~ n rank raman laser, the reflectance of described first high anti-fiber grating (10) > 95%；Described half instead
The corresponding n-th order raman laser of fiber grating (12), the reflectance of described semi reflective fibre grating (12) is 40% ~ 60%；Described second
Corresponding 1st ~ (n-1) the rank raman laser of high anti-fiber grating (13), the reflectance of described second high anti-fiber grating (13) > 95%,
N is natural number.
9. one 4 ~ 8 μm pulse Raman full-optical-fiber laser as described in claim 1 or 2 or 4 or 5 or 7 or 8, its feature exists
In: described gain fibre one (5) is for mixing Ho fluoride ABLAN optical fiber, and described gain fibre two (11) is passive chalcogenide fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620331486.1U CN205646423U (en) | 2016-04-20 | 2016-04-20 | 4 full fiber laser of~8 mu m pulse ramans |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620331486.1U CN205646423U (en) | 2016-04-20 | 2016-04-20 | 4 full fiber laser of~8 mu m pulse ramans |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720465A (en) * | 2016-04-20 | 2016-06-29 | 成都瀚辰光翼科技有限责任公司 | 4-8[mu]m-pulse Raman all-fiber laser |
| CN117277053A (en) * | 2023-11-22 | 2023-12-22 | 深圳市柏金科技有限公司 | Cascade coupling microcavity, cascade coupling microcavity semiconductor laser and regulation and control method |
-
2016
- 2016-04-20 CN CN201620331486.1U patent/CN205646423U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720465A (en) * | 2016-04-20 | 2016-06-29 | 成都瀚辰光翼科技有限责任公司 | 4-8[mu]m-pulse Raman all-fiber laser |
| CN117277053A (en) * | 2023-11-22 | 2023-12-22 | 深圳市柏金科技有限公司 | Cascade coupling microcavity, cascade coupling microcavity semiconductor laser and regulation and control method |
| CN117277053B (en) * | 2023-11-22 | 2024-02-20 | 深圳市柏金科技有限公司 | Cascade coupling microcavity, cascade coupling microcavity semiconductor laser and regulation and control method |
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