CN109768466A - Multi-channel optical fibre swashs combiner excited Raman laser - Google Patents
Multi-channel optical fibre swashs combiner excited Raman laser Download PDFInfo
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- CN109768466A CN109768466A CN201711094409.4A CN201711094409A CN109768466A CN 109768466 A CN109768466 A CN 109768466A CN 201711094409 A CN201711094409 A CN 201711094409A CN 109768466 A CN109768466 A CN 109768466A
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Abstract
Raman laser, the sharp combiner that multifiber laser is exported, pump laser source of the laser as stimulated Raman scattering after closing beam, pumping Raman medium generation raman laser are generated using optical fiber laser pump Raman medium in the present invention.Raman laser generates in resonant cavity, and oscillation of the raman laser in Raman pond may be implemented in one raman laser resonant cavity of setting inside Raman pond, is conducive to the generation and feedback amplification of raman laser.It is intracavitary into laser generation that multi-channel optical fibre can be swashed combiner by the invention, carries out excited Raman conversion.The incoherent optical-fiber laser of multi beam can be synthesized to a branch of coherent Raman laser by the device, it can realize and swash combiner, and the laser different from pumping laser wavelength has been obtained by this method.
Description
Technical field
The present invention is a kind of Raman frequency-converted solid state laser, can be applied in optical-fiber laser frequency conversion and sharp combiner field, this sets
Meter is the laser coupled that generates multiple beams of optical fiber laser into the one end for passing through large mode field optical fiber laser in a large mode field optical fiber
After output again by Lens Coupling to raman laser it is intracavitary or will multiple optical fiber outputs finishing conjunction after directly focus on Raman
In laser cavity, by excited Raman effect, excitation gain generates a branch of raman laser in oscillation chamber.The invention realizes optical fiber
The optics coherence tomography of laser and frequency conversion.
Technical background
Optical-fiber laser is cheap and easy to use, is widely used at present.But the output of optical fiber laser simple optical fiber swashs
Light energy is limited, to obtain high-energy output, the use of more extensive method is at present by multiple beams of optical fiber laser coupled to one
The output laser energy of optical fiber is improved in optical fiber, but the laser coherence that the program obtains is poor, beam quality is poor, is unfavorable for
Remote transmission of the laser in space.
The advantages of optical-fiber laser excited Raman is in terms of optical maser wavelength is that optical-fiber laser is mutually tied with excited Raman converter technique
Conjunction can enrich wavelength type, meet the demand of different applications.
The advantage that more give full play to optical fiber laser just needs to use the method for coherently combined to improve the relevant of laser
Property and directionality, excited Raman are a kind of Laser coherent combining methods, are not only able to achieve Laser synthesizing, and be able to achieve wavelength
Conversion, generate new coherent source.
Light beam synthesis and frequency conversion are done using excited Raman method, the advantage is that the design of its device is simple, debug convenient, wave
Long transformation span is bigger, and variable wavelength is abundant.
Excited Raman is generated using optical fiber laser pump in the present invention, wherein utilizing two different schemes by multi-beam
It is imported in Raman pond after the sharp combiner of fibre, raman laser is generated using resonant cavity, and it is humorous to increase a raman laser inside Raman pond
Oscillation of the raman laser in Raman pond may be implemented in vibration chamber, is conducive to the feedback and amplification of raman laser.The program can incite somebody to action
Multi-channel optical fibre swashs combiner pumping and generates a branch of laser different from pumping laser wavelength.
Summary of the invention
The present invention is that multiple beams of optical fiber laser is carried out conjunction beam, is then input to laser by collimation lens and lays oscillation
In the Raman pond of hysteroscope, the purpose that raman laser oscillation chamber is placed in pond is to realize raman laser in resonant cavity internal feedback gain
And amplify.The raman laser of intracavitary generation passes through the other end of output coupling mirror output of resonant cavity.
Technical scheme is as follows:
Multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser, and mainly composition has two large divisions: pumped fiber laser
Beam merging apparatus, Raman pond and its oscillation chamber.
As illustrated by figure 1 of the attached drawings:
The invention includes fiber laser combiner 1, collimation lens 2, hysteroscope 1, hysteroscope 24, Raman pond 5.
Wherein fiber laser combiner 1 is formed by multi beam single fiber laser coupled, and closing beam about optical-fiber laser can be with
Simply it is described as multiple optical fiber lasers and generates laser being spatially combined into beam of laser again (technology compares into now
It is ripe, do not introduce herein).Collimation lens 2 is arranged in fiber-optic output, and divergencing laser is collimated as less parallel laser.Wherein light
Fine laser bundling device 1 can be multifiber parallel combinations to together, be less parallel by being collimated after collimation lens 2
Light.
Hysteroscope 1 and hysteroscope 24 constitute laser oscillation cavity, and laser oscillation cavity is integrally placed to inside Raman pond 5.Raman pond
5 be hollow tubular container, inside can bear high pressure, laser window is installed at the both ends of pipe, surface is coated with pumping
Laser and raman laser anti-reflection film.As shown in Figure 1, in this design, the high pressure gas of megapascal rank, example are filled in Raman pond 5
It such as may be implemented to add resonant cavity, raman laser in the invention of the hydrogen, methane, deuterium of Raman frequency conversion inside Raman pond 5
It being generated by resonance, is exported finally by the hysteroscope 4 of resonant cavity one end, resonant cavity is made of hysteroscope 1 and hysteroscope 24, they
Riding position as shown in Figure 1, hysteroscope 1 and hysteroscope 24 in Raman pond 5 and perpendicular to the central axis of Raman pond.This is humorous
Shake chamber hysteroscope 1 be crescent hysteroscope, convex surface is coated with pumping laser anti-reflection film, concave surface be coated with pumping laser it is anti-reflection and
Raman laser highly reflecting films.Hysteroscope 24 is raman laser output coupling mirror, and shape is also crescent, and concave surface is coated with Raman
Raman laser and pumping are plated in laser output coupling film (transmissivity of raman laser 5-50%) and pumping laser anti-reflection film, convex surface
What laser anti-reflection film, hysteroscope 1 and hysteroscope 24 were constituted is concentric cavity.It is to realize by the purpose that hysteroscope is designed as crescent
Output raman laser in intracavitary oscillation and can be shaped as parallel laser by the focusing of incident pump laser, raman laser.
Its process realized is: scheme one passes through fiber coupling to one after generating laser using multiple optical fiber lasers
In the fiber laser combiner 1 that root large mode field optical fiber is constituted, as shown in Figure 1, by it after passing through collimation lens 2 after the output of one end
It is input in Raman pond 5；Or Shu Bingtong is closed as shown in figure 3, multiple beams of optical fiber is exported laser using the design of scheme two side by side
It is intracavitary to cross the oscillation that collimation lens 2 is incident in Raman pond 5.Hysteroscope 1 and hysteroscope are focused on by pumping laser after hysteroscope 1
It on central axes between 24, is then exported using hysteroscope 24 and 5 window of Raman pond, generating raman laser in this process will
Intracavitary feedback, gain and amplification can be vibrated in the raman laser that hysteroscope 1 and hysteroscope 24 are constituted, raman laser passes through hysteroscope 24
From intracavitary output.As shown in fig. 6, after the mode beam combination of fiber laser combiner 1 of the optical-fiber laser by scheme two light beam it is poly-
Focus needs to meet on the central axes between hysteroscope 1 and hysteroscope 24.
The invention has the advantages that the Raman frequency conversion of optical fiber laser may be implemented in (1).(2) can by multi-channel optical fibre laser into
The raman laser of a branch of high-energy is generated after row conjunction beam as pumping source.(3) laser of high quality can be obtained.Optical fiber at present
Laser cheap and simple, it is low that single fiber exports energy, although energy is improved after multi fiber closes beam, the disadvantage is that the laser of output
Beam quality is poor, coherence is poor.The design can solve the deficiency of above-mentioned optical fiber laser, and the use of resonant cavity is conducive to generate
The laser of a branch of high quality.
Detailed description of the invention
Fig. 1 is optical-fiber bundling Raman laser structure schematic diagram (scheme one),
Fig. 2 is the structural schematic diagram (scheme one) that 1 multifiber of large mode field optical fiber laser bundling device closes beam,
Fig. 3 is optical-fiber bundling Raman laser structure schematic diagram (scheme two),
Fig. 4 multi fiber laser beam combination bundling device 1 (scheme two),
The concentric cavity schematic diagram that Fig. 5 hysteroscope 1 and hysteroscope 24 form, wherein f=R=L/2,
The schematic diagram that blowing angle requires in fiber laser combiner 1 in Fig. 6 scheme two.
Device name in figure is as follows:
1 fiber laser combiner
2 collimation lenses
3 hysteroscopes one
4 hysteroscopes two
5 Raman ponds.
Specific embodiment
This is illustrated in conjunction with practical situations for detailed description of the present invention specific work process and application method
The specific embodiment of invention.
Embodiment 1
As shown in Figure 1, multi-channel optical fibre, which swashs combiner pumping, generates level-one Stokes laser.It can use in the application defeated
Wavelength generates the raman laser of 4300nm in the optical fiber laser pump hydrogen of 1543nm out.
Fig. 1 in reference to the accompanying drawings, step 1: multiple beams of optical fiber laser is first synthesized into beam of laser by large mode field optical fiber,
Optical-fiber laser output light is collimated into similar parallel laser by collimation lens；
Step 2: assembly Raman pond, places resonator mirror in Raman pond, the plated film of resonant cavity according to 4300nm laser
Resonant cavity plated film, is arranged hysteroscope one and hysteroscope two inside Raman pond respectively after Raman pond is fixed, two hysteroscopes it is recessed
Face is oppositely arranged, and forms concentric cavity.Raman pond window is installed and guarantees that air-tightness is good, High Purity Hydrogen is finally filled in Raman pond
Gas, air pressure 4MPa；
Step 3: pumping laser is imported in the oscillation chamber of Raman pond, pumping laser dimensional orientation is adjusted, raman laser is made
Realize best output.
In addition, optimization first can be adjusted to optical cavity using He-Ne laser in implementation process.
Embodiment 2
By investigation, the commercialized single fiber core diameter of IPG only has 100 μm, wavelength 1070nm at present, if passed through
The design scheme of Fig. 3 can close beam into Raman pond with 19 IPG optical-fiber lasers.The high-purity of 4MPa is filled in Raman pond
1070nm wavelength laser can be transformed into 1926nm by hydrogen, and two microns wavelength are the desired wavelengths of laser surgey, so
This kind design can be applied in laser surgey.
Embodiment 3
It, can be by more pumping optical fibers and a seed laser optical-fiber bundling to Raman according to the design scheme of Fig. 1 and Fig. 3
Chi Zhong, such design can reduce the threshold value of excited Raman, realize the high efficiency conversion of pumping laser.
The implementation process of this kind of scheme can be, by the optical fiber and single 1543nm (semiconductor laser of more 1064nm
Can produce the wavelength) optical-fiber bundling, the methane gas of high-purity is filled in Raman pond, by coupling by the pump of 1064nm
Into Raman oscillation chamber, 1064nm laser pump (ing) methane medium generates level-one for Pu laser and minimal amount of 1543nm laser coupled
Stokes optical maser wavelength is 1543nm, so being coupled to intracavitary a small amount of 1543nm laser can be used as seed light to induce and draw
The efficient generation of graceful laser.In the design there may be the problem of be hysteroscope one by most 1543nm laser reflection back into optical fibers
In, therefore to consider when designing optical fiber the isolation to return laser light, can be to avoid the laser damage wavelength of return in this way
The semiconductor laser of 1543nm.
1543nm laser is human eye safe wavelength, and the wavelength can be applied in laser radar at present.
Claims (7)
1. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser, comprising: fiber laser combiner (1), round collimation lens
(2), hysteroscope one (3), hysteroscope two (4), left and right ends are respectively provided with the Raman pond (5) of transparent window, it is characterized in that: being swashed with optical fiber
The laser that combiner device (1) issues is axis by the central axis of the collimated light beam after collimation lens (2) collimation, in the biography of light beam
Raman pond (5), hysteroscope one (3) and hysteroscope two (4) are placed on central axes by defeated direction, the left and right ends of Raman pond (5) it is saturating
Bright window central axes will guarantee to be overlapped with central axis, and hysteroscope one (3) and hysteroscope two (4) are mounted on to constitute in Raman pond (5) and swash
Optical cavity.
2. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 1, it is characterised in that: wherein optical fiber
Laser bundling device (1) is formed by 2 or more single fiber laser coupleds；
Fiber laser combiner (1) is that 2 or more optical fiber lasers of Same Wavelength generate laser coupled into an optical fiber
(scheme one)；2 or more optical fiber one end is welded to one end of a large mode field optical fiber by fiber fuse；Or, optical-fiber laser
The optical fiber that bundling device (1) is 2 or more will be sent out by optical-fiber bundling device boundling (scheme two), output end face to collimation lens (2)
Scattered laser alignment is parallel laser；Optical-fiber bundling device in scheme two is a cone type block, on cone type block
Through-hole equipped with 2 or more the bottom surfaces on the block, optical fiber from bottom surface through-hole one end pass through through-hole make one end face of optical fiber from
Upper bottom surface through hole end is pierced by, the corresponding through-hole of an optical fiber.
3. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 1, it is characterised in that: wherein optical fiber
Laser bundling device (1) purpose of design is that the laser group for issuing more optical fiber arranged side by side is combined together, after collimation lens (2)
It is collimated as parallel ray laser；This kind closes the mode and polarization state that Shu Fangfa does not limit optical-fiber laser.
4. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 1, it is characterised in that: the Raman pond
(5) be hollow tubular container, inside can bear high pressure, laser window is installed at the both ends of pipe, surface is coated with pump
Pu laser and raman laser anti-reflection film；In this design, high pressure gas, such as hydrogen, methane or deuterium are filled in Raman pond (5)
Etc. Raman active gas.
5. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 1, it is characterised in that: hysteroscope one
(3) and hysteroscope two (4) constitutes laser oscillation cavity, and it is internal that laser oscillation cavity is integrally placed to Raman pond (5).
6. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 1, it is characterised in that: in the invention
Laser resonator is constituted in Raman pond (5) positioned inside hysteroscope one (3) and hysteroscope two (4), raman laser is generated by oscillation, most
Exported afterwards by the hysteroscope two (4) of resonant cavity one end, resonant cavity is made of hysteroscope one (3) and hysteroscope two (4), hysteroscope one (3) and
Hysteroscope two (4) is in Raman pond (5) and perpendicular to the central axis of Raman pond；
The hysteroscope one (3) of the resonant cavity is the hysteroscope of crescent, and convex surface is coated with pumping laser anti-reflection film, and concave surface plating pumping swashs
Light is anti-reflection and raman laser highly reflecting films；
Hysteroscope two (4) is raman laser output coupling mirror, and shape is also crescent, and concave surface is coated with raman laser output coupling
Film (transmissivity of raman laser 5-50% or so) and pumping laser anti-reflection film, raman laser is plated on convex surface and pumping laser is anti-reflection
The chamber that film, hysteroscope one (3) and hysteroscope two (4) are constituted can be stabilization, be situated between steady, unstable cavity；
The purpose that hysteroscope one (3) and hysteroscope two (4) are designed as crescent is to realize the focusing of incident pump laser, and Raman
Laser is parallel laser in intracavitary oscillation and output raman laser.
7. multi-channel optical fibre swashs combiner excited Raman frequency-converted solid state laser according to claim 3, it is characterised in that: scheme two is adopted
The optical-fiber laser that laser bundling device (1) design will meet every optical fiber through-hole being mounted in laser bundling device (1) issues
Laser by collimation lens (2) collimate using hysteroscope one (3) focus on hysteroscope one (3) and hysteroscope two (4) composition resonant cavity
Central axis on.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711094409.4A CN109768466A (en) | 2017-11-09 | 2017-11-09 | Multi-channel optical fibre swashs combiner excited Raman laser |
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| CN201711094409.4A CN109768466A (en) | 2017-11-09 | 2017-11-09 | Multi-channel optical fibre swashs combiner excited Raman laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336249A (en) * | 2020-10-10 | 2022-04-12 | 中国科学院大连化学物理研究所 | Raman laser for realizing wavelength precise tuning through temperature control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761224A (en) * | 1996-04-04 | 1998-06-02 | Her Majesty The Queen As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Miniature stimulated raman shifting cell |
| US9172208B1 (en) * | 2012-02-21 | 2015-10-27 | Lawrence Livermore National Security, Llc | Raman beam combining for laser brightness enhancement |
| CN106684695A (en) * | 2015-11-05 | 2017-05-17 | 中国科学院大连化学物理研究所 | External-cavity anti-stokes Raman laser |
-
2017
- 2017-11-09 CN CN201711094409.4A patent/CN109768466A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761224A (en) * | 1996-04-04 | 1998-06-02 | Her Majesty The Queen As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Miniature stimulated raman shifting cell |
| US9172208B1 (en) * | 2012-02-21 | 2015-10-27 | Lawrence Livermore National Security, Llc | Raman beam combining for laser brightness enhancement |
| CN106684695A (en) * | 2015-11-05 | 2017-05-17 | 中国科学院大连化学物理研究所 | External-cavity anti-stokes Raman laser |
Non-Patent Citations (1)
| Title |
|---|
| 李殿军: "《光纤激光器合光纤放大器》", 31 October 2016 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336249A (en) * | 2020-10-10 | 2022-04-12 | 中国科学院大连化学物理研究所 | Raman laser for realizing wavelength precise tuning through temperature control |
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Application publication date: 20190517 |