CN107437720A - A kind of array rod-shaped laser amplifier - Google Patents
A kind of array rod-shaped laser amplifier Download PDFInfo
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- CN107437720A CN107437720A CN201710731846.6A CN201710731846A CN107437720A CN 107437720 A CN107437720 A CN 107437720A CN 201710731846 A CN201710731846 A CN 201710731846A CN 107437720 A CN107437720 A CN 107437720A
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- gain medium
- rod
- laser
- gain
- medium rod
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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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
-
- 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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
-
- 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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
-
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
-
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/17—Solid materials amorphous, e.g. glass
-
- 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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
The present invention discloses a kind of array rod-shaped laser amplifier, is made up of pumping source, coupled lens group, combined laser gain media, the part of mechanical structure four.The present invention uses the small-bore rod-shaped laser gain media of array, avoids the problem of gain medium is size-constrained, and the quantity of rod can adjust according to energy requirement, have flexibility.The spontaneous radiation of glued absorbable amplification and thermal conductivity are higher than the material of gain media between gain medium rod horizontal direction side, are cooling liquid runner between vertical direction side, can improve thermal management effect in this way.By rationally designing the shape of gain media, the influence of spontaneous radiation and unwanted oscillation can be reduced.The present invention has the characteristics of compact system architecture, auxiliary circulation simple system, good reliability, efficiency high.
Description
Technical field
The present invention relates to high power repetition rate solid state laser technical field, specially a kind of array rod-shaped laser is put
Big device.
Background technology
Efficient Repetition Frequency Solid Laser technology is one of major technique developing direction of high-power laser driver.But in system
Serious fuel factor limits the further lifting of high-power laser driver repetition rate.Fuel factor in system is asked
Topic, the solution of current repeated frequency solid state laser device is mainly from the following aspects：1st, using laser diode (LD) pump
Pu substitutes xenon flash lamp pumping, reduces the thermal source in gain media；2nd, using novel gain medium, replaced with the higher crystal of thermal conductivity
Traditional glass；3rd, using heat sinking mode, heat-sinking capability, such as disk amplifier, slab amplifier are increased.
But above-described measure is problematic in that, such as novel gain dielectric crystal, growth size is limited, therefore can not be made
Bigbore gain media, the Yb of current main-stream application：YAG crystal, patent 101338453 use the diameter of Czochralski grown about
For 35~50mm, document [Xu X, Zhao Z, Zhao G, et al.Comparison of Yb:YAG crystals grown
by CZ and TGT method[J].Journal of Crystal growth,2003,57(3):297-300.] in report
The crystalline size of Growth by Temperature Gradient Technique is used as φ 75mm × 45mm, it can be seen that new laser crystal material is in Gao Gong
Rate laser applies upper limitation.
Using the disk amplifier of the cold mode in face, horizontal ASE, unwanted oscillation are serious in slice structure, can cause gain point
Cloth is uneven, energy storage efficiency is low etc., to suppress ASE, document [Banerjee S, Ertel K, Mason P D, et
al.DiPOLE:a 10J,10Hz cryogenic gas cooled multi-slab nanosecond Yb:YAG laser.
[J].Optics Express,2015,23(15):19542-51.] in report and introduced respectively around Yb: YAG amplifier piece
One circle Cr4+: YAG bound edges absorb horizontal ASE, and this method is although effective, but still need to optimize.In addition, disk amplifier is with multi-disc
Based on formula air cooling, and also there is the problem of auxiliary circulation system architecture complexity of high speed clean gas flow in multiple-piece air cooling structure.
Therefore, suitable gain media is selected, studies the structure of novel high-power laser amplifier and efficient pumping source,
Effective heat management is carried out to system, is the key point for improving high-power laser driver repetition rate.
The content of the invention
The present invention provides a kind of array rod-shaped laser amplifier, and the active ions of each rod of array laser gain media are dense
Grade doping is spent, is filled between rod and rod vertical direction side on pumping optical transport without influence but absorbable gain medium ASE
And thermal conductivity is higher than the material of gain medium, liquid cooling is led between gain medium rod vertical direction, it is sharp so as to realize
Image intensifer repetitive operation, there is the advantages of system architecture is compact, thermal management effect is good, efficiency high.
The technical solution of the present invention is as follows：
A kind of array rod-shaped laser amplifier, by pumping source, coupled lens group, gain medium, mechanical structure four
Part forms, and its feature is that described pumping source is made up of two parallel and staggered relatively laser diodes, described coupling
Close lens group to be made up of two parallel and staggered relatively coupled lens, described gain medium is arranged on described machinery
In structure, it is embedded with respectively than incident pump hot spot in two opposite flanks of the mechanical structure parallel with gain medium side
The big optical transmission window of size, inlet opening and apopore are further respectively had in the mechanical structure.
Described gain medium is array laser gain media, same by N*N root gain medium bar constructions
The active ions doping concentration of gain medium rod described in horizontal direction is successively decreased to both sides respectively from centre, same row laser
The active ions doping concentration of gain media rod is identical, and the active ions doping concentration of single gain medium rod is uniform, institute
The gain medium rod stated is parallel to each other, and spacing is equal, is filled between each gain medium rod of horizontal direction to pump
Pu optical transport is without influenceing but the spontaneous radiation (ASE) of absorbable gain medium amplification while thermal conductivity are higher than laser gain Jie
The material of matter, between the gap and gain medium rod and mechanical structure between each gain medium rod vertical direction
Gap forms cooling liquid passage, and the cooling liquid passage connects with described inlet opening and apopore respectively；
The pump light that laser diode described in two is sent respectively after described coupled lens group shaping homogenizes from
The side vertical incidence of the gain medium rod, the gain medium described in pumping, per beam incident laser respectively from each
The surface feeding sputtering of individual gain medium rod.
The active ions doping concentration of the gain medium rod determines that every laser increases according to the method for energy in part
The pump energy that beneficial dielectric rod absorbs is identical, so that it is determined that the absorption coefficient of every rod, is determined corresponding according to absorption coefficient
Active ions doping concentration, depending on the quantity of gain medium rod energy as needed.
Described cooling liquid channel width is identical.
Described gain medium rod is rectangular shape, and the central cross-section perpendicular to mandrel is square, and laser increases
Two end faces of beneficial dielectric rod are laser light pass surface, are coated with laser wavelength of incidence anti-reflection film, the vertical side of gain medium rod
To two sides and absorbable gain medium ASE material it is glued, be coated with pump light positioned at outermost two sides
Wavelength anti-reflection film.
Described gain medium rod both ends end face cuts with the angle of wedge, and both ends of the surface are vertical with non-glued side, with glued side
Face out of plumb but angulation is identical, and it is symmetrical on rod central cross-section, had certain effect to suppressing unwanted oscillation.
Advantages of the present invention：
1st, the present invention uses small-bore, array rod-shaped laser gain media, and it is size-constrained to avoid gain medium
The problem of, and the number of rod can be changed according to energy requirement, there is flexibility.
2nd, the present invention is using mutually glued between gain media rod and absorbable gain medium ASE material horizontal direction
Mode arrange, the gap between gain media rod vertical direction is cooling liquid flow channel.On the one hand, this material thermal conductivity is higher than increasing
Beneficial dielectric rod, and cooling surface is more, thus effective heat management can be carried out, improve repetition rate；On the other hand, this material can be effective
ASE is absorbed, improves energy storage utilization rate.
3rd, the present invention is simple using the cooling scheme of liquid stream, good cooling results, cooling system.
4th, the present invention is used laser diode side pumped, and gain medium heat deposition caused by because of pumping is reduced,
The efficiency of system greatly improves.
5th, gain medium rod of the invention is grade doping structure, can improve the capacity usage ratio of pumping.
6th, two end faces of gain medium rod of the invention cut with the angle of wedge, can effectively suppress unwanted oscillation.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of array rod-shaped laser amplifier of the present invention.
Fig. 2 is the structural representation of array rod-shaped laser amplifier laser head of the present invention.
Fig. 3 is the cross-section structure block diagram of array rod-shaped laser amplifier of the present invention.
Fig. 4 is the structural representation of gain medium rod of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention will be further described, but the protection model of the present invention should not be limited with this
Enclose.
Referring initially to Fig. 1, Fig. 1 is the overall structure block diagram of array rod-shaped laser amplifier of the present invention.As seen from Figure 1, battle array
Column rod-shaped laser amplifier, by pumping source, coupled lens group, gain medium, the part of mechanical structure four composition.Described
Pumping source includes two parallel and staggered relatively laser diodes 1,2, and described coupled lens group is parallel and relative by two
The coupled lens 3,4 of placement are formed, and described mechanical structure 7 provides gain medium 8 and grips effect, vertically and
Parallel on the direction of the side of gain medium 8, embedded with the optical transmission window 40,41 bigger than incident pump spot size, erecting
Straight and on the direction of optical transmission window, both ends are inlet opening 9 and the place component of apopore 10, paddle hole 9,10 outboard ends
Face is mutually perpendicular to gain media side respectively.
The pump light that laser diode 1,2 described in two is sent is whole by the coupled lens group 3,4 described in two respectively
Shape homogenizes the gain medium 8 described in rear pumping, and every Shu Jiguang of incident laser 5 is respectively from each gain medium rod
Surface feeding sputtering, two beam pump lights are respectively from the side vertical incidence of the gain medium rod.
Described gain medium 8 is array laser gain media, as shown in Fig. 2 it is 4 that this example embodiment, which takes N, institute
The array laser gain media stated be by 16 gain medium rods 11,12,13,14,15,16,17,18,19,20,21,
22nd, 23,24,25,26 form.The side of gain medium rod is parallel to each other, and spacing is equal, is 1mm, and the end face of rod is mutual
It is parallel.The gap of each gain medium rod horizontal direction with material 27,28,29,30,31,32,33,34,35,36,37,
38 is glued, totally 12 absorbable ASE material.The active ions doping concentration of gain medium rod from centre rod respectively to
Both sides are successively decreased, and the active ions doping concentration of single rod is uniform.The active ions doping concentration of gain medium rod is according to energy
The method for measuring decile determines.Gain medium rod 11,15,19,23 and gain medium rod 12 on vertical direction, 16,20,
24 and the active ions doping concentration point of gain medium rod 13,17,21,25 and gain medium rod 14,18,22,26
It is not identical.Depending on the quantity of gain medium rod energy as needed.Gain medium rod 11 in the present embodiment,
15th, 19,23 with the Doped ions concentration of gain medium rod 14,18,22,26 be 1.2%, gain medium rod 12,16,
20th, 24 and the Doped ions concentration of gain medium rod 13,17,21,25 be 0.5%.
Described cooling liquid passage 39 is tied by the gap between gain medium rod and gain medium with machinery
Gap composition between the inwall of structure 7, the cooling liquid passage connect with described inlet opening 9 and apopore 10 respectively, coolant
Body channel width is identical, is 1mm.40,41 be transparent glass in Fig. 2, forms side thang-kng window.
As shown in figure 3, described gain medium rod is rectangular shape, the long 190mm of rod, perpendicular to the center of mandrel
Section is square, and size is 11mm × 11mm.Two end faces 42,43 of gain medium rod are laser light pass surface, are coated with
Laser wavelength of incidence 1053nm anti-reflection film, the oblong lateral surface 46,47 of rod is glued with absorbable ASE material respectively, outermost
Side pumping light entrance face is coated with pump wavelength 802nm anti-reflection film respectively.
Described gain medium plane rod end 42,43 cuts with the angle of wedge, and angle is 0.7 °, both ends of the surface 42,43 and non-gluing
Side 44,45 is vertical, identical with glued side 46,47 out of plumb but angulation and symmetrical on rod central cross-section.
Gain medium is neodymium glass in the present embodiment, and active ions are neodymium ion, and glueing material is the glass for mixing samarium.
Moreover, it will be appreciated that although this specification is described according to way of example, not each embodiment is only
Include an independent technical scheme.Those skilled in the art the present invention can be carried out various modification and variation without departing from
The spirit and scope of the present invention.If these modification and variation of the present invention belong to the claims in the present invention and its equivalent technologies
Within the scope of, then the present invention is also intended to comprising including these changes and deformation.
Claims (4)
- A kind of 1. array rod-shaped laser amplifier, by pumping source, coupled lens group, gain medium, mechanical structure four It is grouped into, it is characterised in that described pumping source is made up of two parallel and staggered relatively laser diodes (1,2), described Coupled lens group be made up of two parallel and staggered relatively coupled lens (3,4), described gain medium (8) installation In described mechanical structure (7), in two opposite flanks of the mechanical structure (7) parallel with gain medium (8) side The optical transmission window (40,41) bigger than incident pump spot size is embedded with respectively, is further respectively had in the mechanical structure (7) into water Hole (9) and apopore (10).Described gain medium (8) is array laser gain media, same by N*N root gain medium bar constructions The active ions doping concentration of gain medium rod described in horizontal direction is successively decreased to both sides respectively from centre, same row laser The active ions doping concentration of gain media rod is identical, and the active ions doping concentration of single gain medium rod is uniform, institute The gain medium rod stated is parallel to each other, and spacing is equal, is filled between each gain medium rod of horizontal direction to pump Pu optical transport is without influenceing but the spontaneous radiation (ASE) of absorbable gain medium amplification while thermal conductivity are higher than laser gain Jie The material of matter, gap and gain medium rod and mechanical structure (7) between each gain medium rod vertical direction it Between gap form cooling liquid passage (39), the cooling liquid passage (39) respectively with described inlet opening (9) and apopore (10) connect；The pump light that laser diode (1,2) described in two is sent is even by described coupled lens group (3,4) shaping respectively From the side vertical incidence of the gain medium rod after change, the gain medium (8) described in pumping, per beam incident laser (5) respectively from the surface feeding sputtering of each gain medium rod.
- 2. array rod-shaped laser amplifier according to claim 1, it is characterised in that the gain medium rod Active ions doping concentration is according to the determination of the method for energy in part, the pump energy phase that every gain medium rod absorbs Together, so that it is determined that the absorption coefficient of every rod, determines corresponding active ions doping concentration, the laser increases according to absorption coefficient Depending on the quantity of beneficial dielectric rod energy as needed.
- 3. combined laser gain media according to claim 1, it is characterised in that described gain medium rod is Rectangular shape, the central cross-section perpendicular to mandrel is square, and two end faces of gain medium rod are laser light pass surface, It is coated with laser wavelength of incidence anti-reflection film, two sides and the absorbable gain medium of the vertical direction of gain medium rod ASE material is glued, and pump wavelength anti-reflection film is coated with positioned at outermost two sides.
- 4. combined laser gain media according to claim 3, it is characterised in that described gain medium rod two End end face cuts with the angle of wedge, and both ends of the surface are vertical with non-glued side, identical with glued side out of plumb but angulation, and on rod Central cross-section is symmetrical, is had certain effect to suppressing unwanted oscillation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710731846.6A CN107437720B (en) | 2017-08-23 | 2017-08-23 | A kind of array rod-shaped laser amplifier |
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| CN201710731846.6A CN107437720B (en) | 2017-08-23 | 2017-08-23 | A kind of array rod-shaped laser amplifier |
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| CN107437720B CN107437720B (en) | 2019-05-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581435A (en) * | 2019-10-17 | 2019-12-17 | 中国科学院光电研究院 | Laser amplifier for restraining spontaneous radiation |
| CN111740299A (en) * | 2020-06-05 | 2020-10-02 | 南京先进激光技术研究院 | Wide-temperature laser gain module |
| CN112821183A (en) * | 2021-01-04 | 2021-05-18 | 中国科学院上海光学精密机械研究所 | Gain medium structure with low thermally induced wavefront distortion for multi-chip laser amplification device |
| CN113169506A (en) * | 2018-11-06 | 2021-07-23 | 法国国家科学研究中心 | High power laser amplifier head |
| CN117134179A (en) * | 2023-10-26 | 2023-11-28 | 中国工程物理研究院应用电子学研究所 | Angle array type gain module capable of eliminating return light and preventing self-oscillation and laser amplifying device |
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|---|---|---|---|---|
| US6763050B2 (en) * | 2000-03-16 | 2004-07-13 | The Regents Of The University Of California | Method for optical pumping of thin laser media at high average power |
| CN103730830A (en) * | 2013-11-06 | 2014-04-16 | 中国科学院上海光学精密机械研究所 | Neodymium and yttrium doped calcium fluoride laser amplifier of laser diode pumping helium cooling |
| CN105261919A (en) * | 2015-11-25 | 2016-01-20 | 中国工程物理研究院激光聚变研究中心 | Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling |
-
2017
- 2017-08-23 CN CN201710731846.6A patent/CN107437720B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6763050B2 (en) * | 2000-03-16 | 2004-07-13 | The Regents Of The University Of California | Method for optical pumping of thin laser media at high average power |
| CN103730830A (en) * | 2013-11-06 | 2014-04-16 | 中国科学院上海光学精密机械研究所 | Neodymium and yttrium doped calcium fluoride laser amplifier of laser diode pumping helium cooling |
| CN105261919A (en) * | 2015-11-25 | 2016-01-20 | 中国工程物理研究院激光聚变研究中心 | Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113169506A (en) * | 2018-11-06 | 2021-07-23 | 法国国家科学研究中心 | High power laser amplifier head |
| CN113169506B (en) * | 2018-11-06 | 2024-02-09 | 法国国家科学研究中心 | High power laser amplifier head |
| CN110581435A (en) * | 2019-10-17 | 2019-12-17 | 中国科学院光电研究院 | Laser amplifier for restraining spontaneous radiation |
| CN111740299A (en) * | 2020-06-05 | 2020-10-02 | 南京先进激光技术研究院 | Wide-temperature laser gain module |
| CN112821183A (en) * | 2021-01-04 | 2021-05-18 | 中国科学院上海光学精密机械研究所 | Gain medium structure with low thermally induced wavefront distortion for multi-chip laser amplification device |
| CN112821183B (en) * | 2021-01-04 | 2023-02-14 | 中国科学院上海光学精密机械研究所 | Gain medium structure with low thermally induced wavefront distortion for multi-chip laser amplification device |
| CN117134179A (en) * | 2023-10-26 | 2023-11-28 | 中国工程物理研究院应用电子学研究所 | Angle array type gain module capable of eliminating return light and preventing self-oscillation and laser amplifying device |
| CN117134179B (en) * | 2023-10-26 | 2024-03-29 | 中国工程物理研究院应用电子学研究所 | Angle array type gain module capable of eliminating return light and preventing self-oscillation and laser amplifying device |
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