CN108092128A - Long light path Ramar laser - Google Patents
Long light path Ramar laser Download PDFInfo
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- CN108092128A CN108092128A CN201611029154.9A CN201611029154A CN108092128A CN 108092128 A CN108092128 A CN 108092128A CN 201611029154 A CN201611029154 A CN 201611029154A CN 108092128 A CN108092128 A CN 108092128A
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- laser
- raman
- light path
- long light
- speculum
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/305—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in a gas
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Excited Raman is a kind of effective laser frequency means, the advantage is that the design of its device is simple, debugging is convenient, and can realize polytype laser frequency conversion, and wavelength conversion span is bigger, and variable wavelength enriches.It can realize that pumping laser repeatedly turning back in Raman pond advantageously reduces the threshold value of excited Raman and improve the transfer efficiency of excited Raman using long light path converter technique, the use of long light path in the present invention.Use of the long light path in excited Raman frequency conversion can effectively reduce excited Raman threshold value, be adapted to the frequency conversion of a variety of lasers.In addition the design of long light path can put forward the stability of high power output, and long light path excited Raman exports the spot energy distribution rule of laser, and hot spot shape is excellent.So the present invention can be widely applied to laser frequency field, this method is a kind of efficient and practical conversion method.
Description
Technical field
The present invention is a kind of long light path Ramar laser, belongs to Raman converter plant, using the design of long light path to realize
Efficient conversion of the basic frequency laser to target wavelength laser, the invention are a kind of devices for obtaining new optical maser wavelength.
Background technology
Laser is a kind of special light sources, with monochromaticjty (output wavelength is single), but the other laser of unitary class at present
Device can not generate the laser of all wavelengths, in order to enrich wavelength species, meet different wavelength demands, it is necessary to existing at present
Some optical maser wavelength is converted, and the wavelength of needs is generated by the conversion of wavelength.
Excited Raman is a kind of important laser frequency method, and excited Raman laser frequency technology is all done both at home and abroad at present
A lot of research and application.At present, some problems are faced in the application of Raman frequency conversion, for example, solid Roman medium has
Having also has the shortcomings that thermal diffusion poor performance while higher gain, so solid Roman medium is only applicable to small energy laser device
Frequency conversion.
Gas Raman medium heat diffusion is more outstanding, available for the laser frequency that power works more than myriawatt, but
Be gas Raman medium gain coefficient it is lower than solid, compared to solid, gas realize excited Raman frequency conversion when pumping is swashed
Power and the light quality requirement of light device are higher, and the problem of based on this aspect, the present invention is using the effect for extending laser and medium
The method of length is to realize efficient conversion of the pumping laser to raman laser.
So-called long light path is that some optical elements is used to turn back to light beam or reflect to realize the light in small space
The multipass of beam extends the gain length of raman laser；For example, the He Liao in terms of being typically used in trace gas detection
Special (Herriott) chamber and White (White) chamber are all long light path devices.
The content of the invention
The purpose of the present invention is on the basis of having laser light source, can realize that Output of laser wavelength turns using the device
It changes, obtains laser with new wavelength.Its process is：Pumping laser is incided into long light path chamber, is made by pumping laser and Raman medium
It is consumed with the Pu laser of rear pump, raman laser is amplified, and finally swashs raman laser and remaining pumping using beam splitting system
Light separates.Technical scheme is as follows：
Pump laser, condenser lens, speculum one, Raman pond, speculum two, beam splitter；Wherein condenser lens, anti-
It penetrates mirror one, Raman pond, speculum two and constitutes long light path excited Raman amplifier, using the output laser of pump laser as light
Axis sets gradually long light path excited Raman amplifier, laser beam splitter.Pump laser can arbitrary output wavelength laser
Device, the form of output can be pulse or continuous laser.Raman pond is the hollow airtight chamber that a both ends carry window, is gathered
Focus lens, speculum one and speculum two are placed in inside Raman pond；Filled with Raman medium in Raman pond, can be gas (hydrogen,
Methane etc.), solid (barium sulfate, diamond etc.) or liquid (water, benzene, nitrobenzene etc.).Speculum one and speculum two can be with
It is any one in concave mirror or plane mirror.The focal length of condenser lens is equal to speculum one and speculum two
Radius of curvature.The speculum one and two surface of speculum that are oppositely arranged are coated with the high-reflecting film of pumping laser and raman laser.Pass through
The air pressure of Raman medium can regulate and control the raman laser wavelength output of its different stage in control Raman pond, in addition inert gas
Add in whether and addition number can also regulate and control output wavelength.
Long light path described in the invention refers to pumping laser repeatedly can be turned back in the apparatus by optical design,
Purpose is to extend the length of pumping laser and Raman medium interaction.
The invention has the advantages that：(1) excited Raman threshold value can be reduced, has widened the application range of Raman converter technique.
(2) long light path can improve transfer efficiency of the pumping laser to raman laser.(3) gas phase is not susceptible to thermal effect than solid dielectric
It should influence, higher pump energy can be born using gas as Raman medium, obtain the raman laser output of higher energy.
(4) Raman medium air pressure change can change output wavelength, and the in addition addition of inert gas can also carry out its output wavelength
Regulation and control.(5) long light path of light path is folded compared with the scheme of once-through Raman pond, and advantage is to export the stability of pulse energy
More preferably, the dimensional energy distribution of hot spot is more regular.Generally speaking, which is a kind of new Wavelength conversion method.
Description of the drawings
Fig. 1 is long light path Raman laser structure schematic diagram,
Fig. 2 is the structure diagram of speculum one and speculum two,
Device name in figure is as follows：1- pump lasers, 2- condenser lenses, 3- speculums one, 4- Raman ponds, 5- reflections
Mirror two, 6- beam splitters.Wherein 2,3,4,5 constitute long light path excited Raman laser.
Specific embodiment
Embodiment one
As shown in Figure 1,
The device and device parameters that the invention uses in actual mechanical process be：
Using the Nd of Quantel:YAG laser is 5 nanoseconds, line as pump light source, the laser output pulse width
A wide wave number, 6 millimeter of spot diameter, energy are adjusted in the range of 0 to 360 millijoules；Using Research
632.8 nanometer laser of visible wavelength of the He-Ne lasers of Electro-Optics.Inc is as instruction light source.
The structure of the Raman pond is tubulose, and length of tube is 120 centimetres, and internal diameter is 80 millimeters, and both ends are equipped with window, is led to
Light aperture is 40 millimeters；Planoconvex spotlight, speculum one, speculum two are set inside Raman pond, between two speculums between
It it is 10 millimeters away from the distance for 100 centimetres or so, light hole of the planoconvex spotlight away from speculum one.Specific layout is referred to attached
Fig. 1 in figure.
The focal length of condenser lens is 50 centimetres, and the concave curvature of speculum one and speculum two is 50 centimetres, and concave surface
On be coated with the high inverse medium film of three wavelength of ＆1064 nanometers ＆1900 nanometers of 632 be coated with, the speculum one used in this embodiment
It is punching mirror with speculum two, specifically as shown in the b in Fig. 2 of attached drawing.
Prism is common light-dividing device, does not do special designing in the invention, is not described in detail specifically herein.
Realization process is：
Two beams of 1064 nanometers and 632 nanometers are swashed into combiner first, the specific practice for closing beam is to use dichroscope will
The vertical laser beam of two beams is combined into all the way, in optical path adjusting afterwards, using He-Ne optical maser wavelengths as reference, to light path tune
Section；Laser is introduced into Raman pond, with reference to He-Ne laser to Raman pond and planoconvex spotlight, speculum one, speculum two position
It puts and finely tunes to realize that laser is repeatedly turned back between two speculums and exported from the light hole of speculum two, finally penetrate
Raman pond window after adjusting, fills the pure hydrogen of 4 megapascal or so in Raman pond；Finally according to the direction of output laser
Dispose prism.
He-Ne laser is first blocked after adjusting, pumping laser energy is adjusted to 50 person of outstanding talent's cokes, can about obtain 60% photon
1900 nanometer lasers of transfer efficiency.
Embodiment two
The device and device parameters used be：
Using Nd:For two double-frequency lasers of YAG laser as pump light source, which is 532 nanometers, arteries and veins
It is 20 nanoseconds, one wave number of line width, 5 millimeter of spot diameter to rush width, and energy is adjusted in the range of 0 to 100 millijoules.
The structure of the Raman pond is tubulose, and length of tube is 60 centimetres, and internal diameter is 80 millimeters, and both ends are equipped with window, is led to
Light aperture is 40 millimeters；Planoconvex spotlight, speculum one, speculum two are set inside Raman pond, between two speculums between
Away from for 40 centimetres or so, distance of the planoconvex spotlight away from speculum one is 5 millimeters；Pure liquid benzene is full of in Raman pond.
The focal length of condenser lens is equal to the concave curvature of speculum one and speculum two, speculum one and speculum two it is recessed
The high inverse medium film of three wavelength of ＆638 nanometers ＆788 nanometers of 532 be coated with, the two homocentric placement of speculum one and speculum are coated on face；
The speculum one and speculum two used in this embodiment is specific as shown in the b in Fig. 2 of attached drawing.
Prism is common light-dividing device, does not do special designing in the invention, is not described in detail specifically herein.
Realization process is：
532 nanometers of laser energy is adjusted to smaller first, using the laser of small energy as reference pair optical path adjusting；It will swash
Light is introduced into Raman pond, to Raman pond and planoconvex spotlight, speculum one, speculum two position finely tune to realize laser from
Raman pond one end is injected, through repeatedly turning back between two speculums after lens and defeated from the other end of window of Raman pond
Go out, prism is finally disposed according to the direction of output laser.
The device can obtain the laser of 635 nanometers and 788 nanometers.
Claims (8)
1. long light path Ramar laser, including：Pump laser (1), condenser lens (2), speculum one (3), Raman pond (4),
Speculum two (5), beam splitter (6)；It is characterized in that：Wherein (2), (3), (4), (5) constitute long light path excited Raman and put
Big device using the output laser of pump laser (1) as optical axis, sets gradually long light path excited Raman amplifier, laser light splitting member
Part (6).
2. long light path Ramar laser according to claim 1, it is characterised in that：Pump laser (1) can be arbitrary
The laser of output wavelength, the form of output can be pulse or continuous laser.
3. according to claim 1 long light path Ramar laser, it is characterised in that：Raman pond (4) is that a both ends carry window
Hollow airtight chamber, it is internal that condenser lens (2), speculum one (3) and speculum two (5) are placed in Raman pond (4).
4. long light path Ramar laser according to claim 1, it is characterised in that：It is situated between in Raman pond (4) filled with Raman
Matter can be gas (hydrogen, methane etc.), solid (barium sulfate, diamond etc.) or liquid (water, benzene, nitrobenzene etc.).
5. long light path Ramar laser according to claim 1, it is characterised in that：Speculum one (3) and speculum two (5)
Can be any one in concave mirror or plane mirror.
6. long light path Ramar laser according to claim 1, it is characterised in that：The focal length of condenser lens (2) is equal to anti-
Penetrate the radius of curvature of mirror one (3) and speculum two (5).
7. long light path Ramar laser according to claim 1, it is characterised in that：The speculum one (3) that is oppositely arranged and
Speculum two (5) surface is coated with the high-reflecting film of pumping laser and raman laser.
8. long light path Ramar laser according to claim 1, it is characterised in that：By controlling Raman in Raman pond (4)
The air pressure of medium can regulate and control the raman laser wavelength output of its different stage, in addition whether the addition of inert gas, add in lazy
The species of property gas and the number of addition can also regulate and control output wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611029154.9A CN108092128A (en) | 2016-11-22 | 2016-11-22 | Long light path Ramar laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611029154.9A CN108092128A (en) | 2016-11-22 | 2016-11-22 | Long light path Ramar laser |
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| Publication Number | Publication Date |
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| CN108092128A true CN108092128A (en) | 2018-05-29 |
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| CN201611029154.9A Pending CN108092128A (en) | 2016-11-22 | 2016-11-22 | Long light path Ramar laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186494A (en) * | 2019-07-04 | 2021-01-05 | 中国科学院大连化学物理研究所 | CO (carbon monoxide)2Cascade ultraviolet Raman laser |
| CN113783096A (en) * | 2020-06-10 | 2021-12-10 | 中国科学院大连化学物理研究所 | Gas stimulated Raman scattering device focused by astigmatic lens |
| CN114256729A (en) * | 2020-09-22 | 2022-03-29 | 中国科学院大连化学物理研究所 | Intermediate infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114552351A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Gas stimulated Raman scattering device of multi-pass cell of discrete mirror |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4361770A (en) * | 1980-12-15 | 1982-11-30 | Exxon Research And Engineering Co. | Technique for synchronization of raman scattered radiation |
-
2016
- 2016-11-22 CN CN201611029154.9A patent/CN108092128A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4361770A (en) * | 1980-12-15 | 1982-11-30 | Exxon Research And Engineering Co. | Technique for synchronization of raman scattered radiation |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186494A (en) * | 2019-07-04 | 2021-01-05 | 中国科学院大连化学物理研究所 | CO (carbon monoxide)2Cascade ultraviolet Raman laser |
| CN113783096A (en) * | 2020-06-10 | 2021-12-10 | 中国科学院大连化学物理研究所 | Gas stimulated Raman scattering device focused by astigmatic lens |
| CN114256729A (en) * | 2020-09-22 | 2022-03-29 | 中国科学院大连化学物理研究所 | Intermediate infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114256729B (en) * | 2020-09-22 | 2024-04-09 | 中国科学院大连化学物理研究所 | Mid-infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114552351A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Gas stimulated Raman scattering device of multi-pass cell of discrete mirror |
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Application publication date: 20180529 |