CN208401251U - A kind of off-axis eight journeys laser amplification device based on birefringece crystal - Google Patents
A kind of off-axis eight journeys laser amplification device based on birefringece crystal Download PDFInfo
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- CN208401251U CN208401251U CN201821220467.7U CN201821220467U CN208401251U CN 208401251 U CN208401251 U CN 208401251U CN 201821220467 U CN201821220467 U CN 201821220467U CN 208401251 U CN208401251 U CN 208401251U
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Abstract
The utility model discloses a kind of off-axis eight journeys laser amplification device based on birefringece crystal, is related to field of laser device technology.The device is made of polarization splitting prism, birefringece crystal, 45 ° of Faraday polarization apparatus, spatial filter, laser amplifier head and reflecting mirror.Seed pulse laser is injected into the off-axis eight journeys laser amplifier device, under the control of the polarization splitting prism, birefringece crystal, 45 ° of Faraday polarization apparatus and reflecting mirror, off-axis eight Cheng Fang great of seed laser is realized by laser amplifier head with certain off-axis angle, eight times.The utility model can significantly improve the energy extraction efficiency of laser amplifier, the beam quality and output pulse signal-to-noise ratio of output laser can be obviously improved, the loss of laser off-axis angle bring is avoided instead of traditional electrooptical switching, the energy stability of improving laser amplifier, so that the reliability and cost performance of entire amplifier system have obtained larger raising, and good pulse signal-to-noise ratio is obtained, there is important application in superpower laser device.
Description
Technical field
The utility model relates to field of laser device technology, in particular to a kind of off-axis eight based on birefringece crystal
Journey laser amplification device.
Background technique
For off-axis Multi-pass laser amplifier because of its energy extraction efficiency height, pulse signal-to-noise ratio is high and can effectively inhibit self-excitation existing
As the advantages that, had a wide range of applications in great-power solid laser.Document " M.L.Spaeth, K.R.Manes,
In D.H.Kalantar, P.E.Miller, et.al., " Description of the NIF Laser ", (2016) " page 31
A kind of off-axis quadruple pass laser amplifier device and method are disclosed, in this way, the capacity usage ratio of laser amplifier obtains
Raising is arrived, output laser signal-noise ratio is high, but efficiency is still < 50%.A kind of patent " off-axis eight journeys laser amplifier
(CN207234148U) " a kind of device that off-axis eight journeys amplifier is realized using electrooptical switching is disclosed, the principle of device is simple,
It is easy to accomplish, and electrooptical switching helps to inhibit self-excitation and improves pulse signal-to-noise ratio, but due to off-axis, laser is each
It is different by the angle of electrooptical switching, therefore ideal value is not achieved to the knots modification of laser polarization state, to influence laser light
Rate, and due to the presence of electrooptical switching high voltage power supply (the general thousands of volts up to ten thousand of half wave voltage), so that laser amplifier
The cost performance and reliability decrease of device.
It is therefore desirable to further study the off-axis multi-pass laser amplification that a kind of energy extraction efficiency is high and reliable, cheap
Device.
Utility model content
For above-mentioned problems of the prior art, the utility model provides a kind of off-axis eight based on birefringece crystal
Journey laser amplification device solves traditional off-axis laser and puts in the case where guaranteeing the signal-to-noise ratio and beam quality of output laser
The lower problem of big device energy extraction efficiency, device reliability and efficiency of transmission have obtained larger raising.
To achieve the above object, the utility model provides the following technical solutions:
A kind of off-axis eight journeys laser amplification device based on birefringece crystal, which is characterized in that along direction of laser propagation
Successively by the first polarization splitting prism (1), birefringece crystal (2), the second polarization splitting prism (3), the first spatial filter
(4), laser amplifier head (5), the one 45 ° of reflecting mirror (6), the 2nd 45 ° of reflecting mirror (7), 45 ° of Faraday polarization apparatus (8), the second sky
Between filter (9), the one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11) and the 3rd 0 ° of reflecting mirror (12) composition；
Seed laser is injected into after the first polarization splitting prism (1) and birefringece crystal (2) by the one 0 ° of reflecting mirror
(10) and in the amplifier chamber of the 2nd 0 ° of reflecting mirror (11) composition, laser is amplifying under the control of 45 ° of Faraday polarization apparatus (8)
Amplify four times in device chamber；Laser by quadruple pass amplification is exported from the second polarization splitting prism (3), after birefringece crystal,
It is reflected into the 3rd 0 ° of reflecting mirror (12) from the first polarization splitting prism (1), after reflection backtracking, after birefringece crystal
It is re-injected into the amplifier chamber being made of the one 0 ° of reflecting mirror (10) and the 2nd 0 ° of reflecting mirror (11), completes quadruple pass again
Amplification；Finally exported from the second polarization splitting prism (3), it is defeated after birefringece crystal (2) and the first polarization splitting prism (1)
Out, eight Cheng Fang great are completed.
First polarization splitting prism (1) is parallel with the polarization direction of the second polarization splitting prism (3), is incident on for laser four times
Angle, birefringent crystal material and the geometrical length of birefringece crystal (2) need to meet: laser is not sent out by retrodeviating polarization state for the first time
It is raw to change, it is rotated by 90 ° by retrodeviating polarization state, is rotated by 90 ° for the third time by retrodeviating polarization state for the second time, the 4th time by retrodeviating polarization state
It does not change.
The polarization direction of first polarization splitting prism (1) and the second polarization splitting prism (3) is vertical, is incident on for laser four times
Angle, birefringent crystal material and the geometrical length of birefringece crystal need to meet: laser is retrodeviated by birefringece crystal for the first time
Polarization state is rotated by 90 °, and birefringece crystal polarization state does not change after second of warp, passes through birefringece crystal rear polarizer for the third time
State does not change, and the 4th process birefringece crystal retrodeviates polarization state and be rotated by 90 °.
The spatial filter (4,9) is made of two pieces of lens, seal pipe, aperture plates；Two pieces of lens are confocal, and point
Not Wei Yu seal pipe both ends, aperture plate is located on the confocal focal plane of two pieces of lens.
Small hole number in first spatial filter (4) on aperture plate is 4, and aperture size is identical, and described second is empty
Between small hole number in filter (9) on aperture plate be 4, aperture size is identical.
4 square arrangements of aperture in first spatial filter (4) are located at the upper left corner, the lower right corner, the lower left corner
Number with 4 apertures in the upper right corner is respectively 1., 2., 3., 4., the first spatial filter to be passed through in eight journey amplification process of laser
(4) 1., 2., 3., 4., 4., 3., 2., 1. the sequence of aperture is.
The aperture in aperture and first spatial filter (4) in the second space filter (9), which meets, to be conjugated
Imaging relations.
The interval between orifice size and aperture in the spatial filter is to be rationally designed according to the actual situation.
The one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11), the 3rd 0 ° of reflecting mirror (12) and laser amplifier head (5)
Center meets conjugate imaging relationship.
The beneficial effects of the utility model are as follows:
1, compared to traditional quadruple pass laser amplifier, disclosed in the utility model it is a kind of based on birefringece crystal from
Eight journey laser amplification device of axis, under square one, gain factor and energy extraction efficiency of the laser after the device are obvious
It improves.
2, the utility model replaces traditional electrooptical switching using birefringece crystal, avoids laser off-axis angle and brings
Loss, the system transmitance of amplifier is improved, and due to not needing high-voltage power supply, so that entire amplifier system is reliable
Property and cost performance have obtained larger raising.
3, stringent Image relaying technology and off axis amplification technology are utilized in the utility model, can be obviously improved the light of output laser
Beam quality and output pulse signal-to-noise ratio.
Detailed description of the invention
Fig. 1 is schematic device provided in first embodiment.
Fig. 2 is the arrangement of first embodiment spatial filter aperture, wherein (a) is the first spatial filter, it is (b) the
Two spatial filters.
Fig. 3 is the geometric figure that laser passes through birefringece crystal in second embodiment.
In figure: the 1-the first polarization splitting prism, 2-birefringece crystals, the 3-the second polarization splitting prism, 4-the first is empty
Between filter, 5-laser amplifier heads, 6-the one 45 ° of reflecting mirror, 7-the 2 45 ° of reflecting mirror, 8-45 ° of Faraday polarization apparatus,
9-second space filters, 10-the one 0 ° of total reflective mirror, 11-the 20 ° of reflecting mirror, 12-the 30 ° of reflecting mirror.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution of the utility model, below with reference to the utility model
Attached drawing carries out clear, complete description to the technical solution of the utility model, and based on the embodiment in the application, this field is general
Logical technical staff other similar embodiments obtained without making creative work, all should belong to the application
The range of protection.
Embodiment 1
The present embodiment is as shown in Figure 1, be a kind of off-axis eight journeys laser amplification device based on birefringece crystal, described device
Along direction of laser propagation successively by the first polarization splitting prism (1), birefringece crystal (2), the second polarization splitting prism (3),
First spatial filter (4), laser amplifier head (5), the one 45 ° of reflecting mirror (6), the 2nd 0 ° of reflecting mirror (7), 45 ° of faraday's rotations
Light device (8), second space filter (9), the one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11) and the 3rd 0 ° of reflecting mirror (12)
Composition.And in the one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11), the 3rd 0 ° of reflecting mirror (12) and laser amplifier head (5)
The heart is mutually imaged.
Eight journey amplification process are as follows: seed laser is injected from left side, and after the first polarization splitting prism (1), laser becomes
At P-polarized light, retrodeviates polarization state by birefringece crystal (2) for the first time and do not change, completely through the second polarization splitting prism (3),
Into the quadruple pass amplifier chamber being made of the one 0 ° of reflecting mirror (10) and the 2nd 0 ° of reflecting mirror (11), pass through 45 ° of Faradays
Device (5) controls laser polarization state, and laser completes a quadruple pass amplification in chamber, and (quadruple pass amplification principle here can refer to document
“Bruno M.Van Wonterghem,John R.Murray,et al.,“Performance of a prototype for
a large-aperture multipass Nd:glass laser for inertial confinement fusion”,
Applied Optics,36(21),4932-4953(1997)")；It is inclined from second with P polarization state by the amplified laser of quadruple pass
It shakes Amici prism (3) export, then second passes through birefringece crystal (2), and it is inclined by P polarization to become S through laser polarization state later
Vibration, is reflected into the 3rd 0 ° of reflecting mirror (12) from the first polarization splitting prism (1), after reflection backtracking, for the third time by double
Refracting crystal (2) becomes P polarization by S-polarization through laser polarization state later, completely through after the second polarization splitting prism (3) again
It is secondary to enter quadruple pass amplifier chamber, and a quadruple pass amplification is completed, eight amplifications, i.e. eight Cheng Fang great are completed in total.After eight Cheng Fang great
Laser from the second polarization splitting prism (3) export, and the 4th time pass through birefringece crystal (2), do not sent out through laser polarization later
It is raw to change, then exported from the first polarization splitting prism (1).
Spatial filter design: eight off-axis journey laser amplifiers include two spaces filter (4,9), each space filter
Wave device is made of two pieces of lens, a vacuum tube and one piece of aperture plate, and lens are located at vacuum tube two sides and confocal, and aperture plate is located at
On the focal plane of two lens.There are 4 apertures on each aperture plate, the arrangement and aperture number along laser direction observation aperture are such as
Shown in Fig. 2, the square arrangement of aperture, 4 orifice sizes on each aperture plate are identical, and the first spatial filter (4)
The aperture of aperture and second space filter (9) is mutually imaged.Eight journeys put it is big-and-middle, laser by the first spatial filter (4) and
The sequence of second space filter (9) is as shown in table 1, is 1., 2., 3., 4., 4., 3., 2., 1. i.e. the first journey and the 8th journey
Laser direction is parallel, and the second journey is parallel with the 7th journey laser direction, and third journey is parallel with the 6th journey laser direction, quadruple pass and
Five journey laser directions are parallel.
Laser passes through the sequence of spatial filter pinhole in 1 eight journey amplification process of table
The principle of birefringece crystal change laser polarization state: laser is decomposed into o light and e light by birefringece crystal, due to o
Light is different with the refractive index of e light, and when being emitted from birefringece crystal, o light is different with the phase-delay quantity of e light, generates certain phase
Potential difference, so that the polarization state of shoot laser changes.For given birefringece crystal, the phase difference of o light e light and double
Refracting crystal length is related to the angle of laser light incident to birefringece crystal.According to the introduction of front, in eight off-axis Cheng Fang great
In device, laser four times processes birefringece crystal (2) are for the first time phases by the laser direction of birefringece crystal (2) with the 4th time
With, second is identical by the laser direction of birefringece crystal (2) with third time, therefore birefringent by rationally designing
Crystal (2) length and laser light incident are to the angle of birefringece crystal (2), and laser is for the first time and the 4th time is passed through birefringece crystal
(2) when, o light and e light phase difference are the even-multiple of π, and when second and third time pass through birefringece crystal (2), o light and e light
Phase difference is the odd-multiple of π, i.e., laser polarization state does not change laser for the first time and after the 4th warp, is passed through for the second time with third time
Later laser polarization state is rotated by 90 °.
Embodiment 2
Birefringece crystal is long in present embodiment discloses a kind of off-axis eight journeys laser amplification device based on birefringece crystal
The design method of degree and laser light incident to birefringece crystal angle.
According to the introduction in embodiment 1, in off-axis eight journeys laser amplifier disclosed in the utility model, for the first time with the 4th
The secondary laser direction by birefringece crystal (2) be it is identical, second and third time pass through the laser side of birefringece crystal (2)
To being identical, therefore laser can be reduced to by the model of birefringece crystal as shown in figure 3, z-axis is the light of birefringece crystal
Axis, it is assumed that the angle of the first Cheng Jiguang and optical axis is β, and quadruple pass laser and optical axis included angle are α, and A point is laser and birefringent crystalline substance
The intersection point of body, subpoint of the A point in YOZ plane are the off-axis angle that A ', θ and γ are respectively laser, have θ=γ, from geometry
Respectively the angle of the first journey laser direction and vertical plane OAA ' are θ in relationship and quadruple pass laser transmission direction is in horizontal plane
Interior projected angle is γ.
When first Cheng Jiguang passes through birefringece crystal, it is divided into o light and e light, the polarization state of two kinds of light is mutually orthogonal.Due to o
Light is different with the refractive index of e light, and phase difference can be generated after birefringece crystal.First Cheng Jiguang is after birefringece crystal, e
The refractive index of lightAnd the phase difference δ of o light, e light1It is respectively as follows:
Wherein, noAnd neThe respectively refractive index of the o light of birefringece crystal and e light, λ are optical maser wavelength, and L is crystal length.
Equally, when passing through birefringece crystal for quadruple pass laser, e optical index ne (2)For shown in equation (3), o at this time
The phase difference δ of light and e light2For shown in equation (4):
According to the introduction in embodiment 1, the first journey and quadruple pass laser are after birefringece crystal, the phase of o light and e light
Difference is respectively the even-multiple and odd-multiple of π, and substituting into equation (1-4) has
Its m and n is natural number.
According to the solid geometry relationship of Fig. 3, the optical axis included angle β of the first Cheng Jiguang and birefringece crystal, quadruple pass laser with
The off-axis angle θ of birefringece crystal optical axis included angle α and laser meets following relationship.
Cos (α)=cos (θ) cos (β-θ) (7)
As long as the small pitch of holes on aperture plate is fixed, the off-axis angle θ of laser is constant, in given birefringent material condition
Under, birefringece crystal length L, the first Cheng Jiguang can be solved by the angle beta of birefringece crystal and the in conjunction with equation (5-7)
Value of the quadruple pass laser by the angle [alpha] of birefringece crystal.
By taking common KD*P birefringece crystal as an example, o light and e optical index are respectively 1.4951 and 1.4574, it is assumed that
Laser off-axis angle θ or γ are 0.432 °, are calculated under the conditions of different m values, and birefringece crystal length L and the first Cheng Jiguang pass through
The angle beta of birefringece crystal, it is as shown in table 2, any to select a wherein class value, laser can be realized and pass through for the first time with the 4th time
Laser polarization state does not change afterwards, and laser polarization state is rotated by 90 ° for the second time and after third time warp.
4 (m, β, the L) that table 2 solves combine solution
| m | β(°) | L(mm) |
| 0 | 0 | 255 |
| 1 | 1.4 | 45 |
| 2 | 2.66 | 25 |
| 3 | 3.64 | 20 |
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (9)
1. a kind of off-axis eight journeys laser amplification device based on birefringece crystal, which is characterized in that along direction of laser propagation according to
It is secondary by the first polarization splitting prism (1), birefringece crystal (2), the second polarization splitting prism (3), the first spatial filter (4),
Laser amplifier head (5), the one 45 ° of reflecting mirror (6), the 2nd 45 ° of reflecting mirror (7), 45 ° of Faraday polarization apparatus (8), second space filter
Wave device (9), the one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11) and the 3rd 0 ° of reflecting mirror (12) composition；
Seed laser is injected into after the first polarization splitting prism (1) and birefringece crystal (2) by the one 0 ° of reflecting mirror (10)
In the amplifier chamber constituted with the 2nd 0 ° of reflecting mirror (11), laser is in amplifier chamber under the control of 45 ° of Faraday polarization apparatus (8)
Middle amplification four times；Laser by quadruple pass amplification is exported from the second polarization splitting prism (3), after birefringece crystal, from the
One polarization splitting prism (1) is reflected into the 3rd 0 ° of reflecting mirror (12), after reflection backtracking, after birefringece crystal again
It is injected into the amplifier chamber being made of the one 0 ° of reflecting mirror (10) and the 2nd 0 ° of reflecting mirror (11), completes quadruple pass again and put
Greatly；Finally exported from the second polarization splitting prism (3), it is defeated after birefringece crystal (2) and the first polarization splitting prism (1)
Out, eight Cheng Fang great are completed.
2. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 1, which is characterized in that
First polarization splitting prism (1) is parallel with the polarization direction of the second polarization splitting prism (3), is incident on birefringent crystalline substance laser four times
Angle, birefringent crystal material and the geometrical length of body (2) need to meet: laser does not change by retrodeviating polarization state for the first time,
Second of process retrodeviates polarization state and is rotated by 90 °, and is rotated by 90 ° for the third time by retrodeviating polarization state, and the 4th process retrodeviates polarization state and do not occur
Change.
3. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 1, which is characterized in that
The polarization direction of first polarization splitting prism (1) and the second polarization splitting prism (3) is vertical, is incident on birefringent crystalline substance laser four times
Angle, birefringent crystal material and the geometrical length of body need to meet: laser passes through birefringece crystal for the first time and retrodeviates polarization state rotation
90 °, birefringece crystal polarization state does not change after passing through for the second time, retrodeviates polarization state by birefringece crystal for the third time and does not occur
Change, the 4th process birefringece crystal retrodeviates polarization state and be rotated by 90 °.
4. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 1, which is characterized in that
The spatial filter (4,9) is made of two pieces of lens, seal pipe, aperture plates；Two pieces of lens are confocal, and are located at close
The both ends of tube sealing, aperture plate are located on the confocal focal plane of two pieces of lens.
5. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 4, which is characterized in that
Small hole number in first spatial filter (4) on aperture plate is 4, and aperture size is identical, the second space filter
(9) the small hole number on aperture plate is 4, and aperture size is identical.
6. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 5, which is characterized in that
4 square arrangements of aperture in first spatial filter (4) are located at the upper left corner, the lower right corner, the lower left corner and the upper right corner
The number of 4 apertures is respectively 1., 2., 3., 4., by the first spatial filter (4) aperture in eight journey amplification process of laser
1., 2., 3., 4., 4., 3., 2., 1. sequence is.
7. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 6, which is characterized in that
The aperture in aperture and first spatial filter (4) in the second space filter (9) meets conjugate imaging relationship.
8. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 1, which is characterized in that
The interval between orifice size and aperture in the spatial filter is to be rationally designed according to the actual situation.
9. a kind of off-axis eight journeys laser amplification device based on birefringece crystal according to claim 1, which is characterized in that
The one 0 ° of reflecting mirror (10), the 2nd 0 ° of reflecting mirror (11), the 3rd 0 ° of reflecting mirror (12) and laser amplifier head (5) center meet
Conjugate imaging relationship.
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| CN201821220467.7U CN208401251U (en) | 2018-07-31 | 2018-07-31 | A kind of off-axis eight journeys laser amplification device based on birefringece crystal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736302A (en) * | 2018-07-31 | 2018-11-02 | 中国工程物理研究院激光聚变研究中心 | A kind of off-axis eight journeys laser amplification device and design method based on birefringece crystal |
| CN114498257A (en) * | 2021-12-09 | 2022-05-13 | 中国电子科技集团公司第五十三研究所 | Four-stroke batten laser amplification system |
-
2018
- 2018-07-31 CN CN201821220467.7U patent/CN208401251U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736302A (en) * | 2018-07-31 | 2018-11-02 | 中国工程物理研究院激光聚变研究中心 | A kind of off-axis eight journeys laser amplification device and design method based on birefringece crystal |
| CN108736302B (en) * | 2018-07-31 | 2023-06-06 | 中国工程物理研究院激光聚变研究中心 | Off-axis eight-pass laser amplification device based on birefringent crystal and design method |
| CN114498257A (en) * | 2021-12-09 | 2022-05-13 | 中国电子科技集团公司第五十三研究所 | Four-stroke batten laser amplification system |
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