CN102646918B - Multi-pass amplification device applied to end-pumped laser amplifier - Google Patents
Multi-pass amplification device applied to end-pumped laser amplifier Download PDFInfo
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Abstract
The invention provides a multi-pass amplification device applied to an end-pumped laser amplifier. The end-pumped laser amplifier comprises a laser working medium, and a reflecting film is coated on one side of the laser working medium close to a pump source and is used for reflecting laser needing to be amplified. The multi-pass amplification device comprises a first loop structure, a second loop structure and a reflecting structure, wherein the first loop structure is used for receiving the laser from the reflecting film and reflecting the laser back to the reflecting film; the second loop structure is used for receiving the laser from the first loop structure via reflection of the reflecting film and reflecting the laser back to the reflecting film; and the reflecting structure is usedfor receiving the laser from the second loop structure via reflection of the reflecting film and reflecting the laser back to the laser working medium according to the incidence direction. A non-zero-degree included angle exists between a normal vector of the reflecting film and a first direction, and the incidence direction of the laser needing to be amplified is regarded as the first direction.By means of the multi-pass amplification device applied to the end-pumped laser amplifier, use ratio of energy released by the pump laser working medium of a pump source can be increased.
Description
Technical field
The present invention relates to the laser amplifier field, relate in particular to a kind of multipass amplifying device that is applied to hold the pumping image intensifer.
Background technology
Along with the development of laser technology, people are more and more higher to the requirement of laser output energy, and laser aid is gradually to the future development of compact conformation simultaneously.
Traditional end pump amplifier structure as shown in Figure 1, because laser working medium is coated with the identical reflectance coating of optical maser wavelength that is exaggerated with need near a side of pumping source, twice process of the laser that need be exaggerated working media claims laser to walk " two journeys " in laser working medium inside.
Its shortcoming is, do not take full advantage of the energy that pumping source pumping laser working media discharges, and capacity usage ratio is low.If make the higher energy of Laser output that need be exaggerated, only in subordinate's amplifier, increase similar structures, the space of laser amplifier integral body is increased, be unfavorable for that laser amplifier is to the trend development of miniaturization.
Summary of the invention
The purpose of this invention is to provide a kind of multipass amplifying device that is applied to hold the pumping image intensifer, the utilance of the energy that raising pumping source pumping laser working media discharges.
According to an aspect of the present invention, a kind of multipass amplifying device that is applied to hold the pumping image intensifer is provided, described end pumping image intensifer comprises laser working medium, and its side near pumping source is coated with reflectance coating, and this reflectance coating reflects the laser that described need are exaggerated;
This multipass amplifying device comprises:
The first ring line structure is used for receiving the laser from reflectance coating, and with laser reflection back reflective film;
The second loop structure is used for receiving from the laser of first ring line structure through the reflectance coating reflection, and with laser reflection back reflective film; With
Catoptric arrangement be used for to receive from the laser of the second loop structure through the reflectance coating reflection, and this laser is reflected back laser working medium according to the opposite direction of incident direction;
Wherein, there is non-vanishing angle between the normal vector of described reflectance coating and the first direction; The incident direction of the laser that described need are exaggerated is first direction.
Optionally, described loop structure comprises two speculums, and described catoptric arrangement comprises a speculum.
Optionally, two speculums in the described first ring line structure are respectively the first speculum and the second speculum, two speculums in described the second loop structure are respectively the 3rd speculum and the 4th speculum, and the speculum in the described catoptric arrangement is the 5th speculum;
Described the first speculum be used for to receive the laser from reflectance coating, and with this laser reflection to the second speculum;
Described the second speculum be used for to receive the laser from the first speculum, and with this laser reflection to reflectance coating;
Described reflectance coating also is used for laser is reflexed to the 3rd speculum again;
Described the 3rd speculum is used for receiving the laser from reflectance coating, and with this laser reflection to the four speculums;
Described the 4th speculum be used for to receive the laser from the 3rd speculum, and with this laser reflection to reflectance coating;
Described reflectance coating also is used for laser is reflexed to the 5th speculum again;
Described the 5th speculum be used for to receive the laser from reflectance coating, and with this laser reflection to reflectance coating.
Optionally, it is second direction that two speculums in the described loop structure are arranged in the laser direct of travel that reflects between the two, and this second direction is vertical with described first direction;
The angle γ of the speculum in the i loop structure and second direction is:
γ＝45°+i×θ
The angle ρ of the speculum in the catoptric arrangement and second direction is:
ρ＝2θ×(1+I)
Wherein, θ represents the normal vector of described reflectance coating and the angle between the first direction, I representative ring line structure quantity.
Optionally, described angle theta is 4 °～8 °.
Compared with prior art, advantage of the present invention comprises: (1) can take full advantage of the energy that pumping source pumping laser working media discharges, and improves capacity usage ratio; (2) compact conformation of the present invention is beneficial to laser amplifier to the trend development of miniaturization; (3) be beneficial to apparatus of the present invention and verify by experiment, the energy of laser output is highly stable.
Description of drawings
Fig. 1 is end pump amplifier structural representation of the prior art;
Fig. 2 is the structural representation of the end pump amplifier multipass amplifying device that provides in the one embodiment of the invention;
Fig. 3 is the structural representation of the end pump amplifier multipass amplifying device that does not comprise loop structure that provides in the another embodiment of the present invention;
Fig. 4 is the structural representation of the end pump amplifier multipass amplifying device that comprises a loop structure that provides in the another embodiment of the present invention;
Fig. 5 a is the concrete example of embodiment shown in Figure 4, and wherein laser working medium angle of inclination vertically is 5 °;
Fig. 5 b is the sketch of Fig. 5 a;
Fig. 6 is the structural representation of the end pump amplifier multipass amplifying device that comprises two loop structures that provides in the another embodiment of the present invention;
Fig. 7 a is the concrete example of embodiment shown in Figure 6, and laser working medium angle of inclination vertically is 5 °;
Fig. 7 b is the angle analysis schematic diagram of embodiment shown in Figure 6.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
In order to solve technical problem of the prior art, the inventor finds through research, can repeatedly pass through laser working medium by making the laser that needs to amplify, and reaches the purpose that improves capacity usage ratio.
Based on above-mentioned analysis, according to one embodiment of the invention, provide a kind of multipass amplifying device.As shown in Figure 2, this device comprises:
At first, for ease of explanation, take the first incident direction of laser as horizontal direction, in the plane perpendicular to the direction of this horizontal direction as vertical direction.
Wherein, the no longer as shown in Figure 1 vertical placement of laser that laser working medium 201 and the need of incident are exaggerated, vertically tilt (for example 0.1 °～25 ° of small angle theta of laser working medium 201, preferred 1 °～15 °, more preferably 4 °～8 °) to place, this θ angle is labeled as angle in the drawings.
Wherein, loop structure 203 can have one or more.Previous loop structure 203 emitting lasers enter next loop structure 203, until enter catoptric arrangement 204 after reflecting through reflectance coating 202.
According to a further embodiment of the invention, provide a kind of multipass amplifying device, wherein do not comprise loop structure.
As shown in Figure 3, this multipass amplifying device comprises:
Speculum 503 be used for so that the laser that the need of incident are exaggerated repeatedly passes through laser working medium 501, and the opposite direction along incident direction is returned after amplification.
For conveniently understanding light path, in Fig. 3, with the light path that 1. 2. represents the first half section of dashed lines labeled, the light path of second half section is returned along former road.Detailed process is as follows:
1) laser that is exaggerated of the need of incident enters laser working medium 501, amplifies the 1st journey;
2) because laser working medium 501 is coated with reflectance coating 502, the laser that need be exaggerated is reflected, and amplifies the 2nd journey;
3) vertically tilt owing to laser working medium 501, the laser that the need that are reflected are exaggerated no longer returns by former road, but incide (angle of the normal of incident ray and speculum 503 is 0 °) on the speculum 503, again through speculum 1 reflection, again enter laser working medium, amplify the 3rd journey;
4) through reflectance coating 502 reflections of laser working medium, amplify the 4th journey; At last, the laser after the amplification returns along the opposite direction of initial incident direction.
Through above-mentioned light path process, 4 processes of the laser that the need of incident are exaggerated laser working medium, namely quadruple pass amplifies.
If laser working medium angle of inclination vertically is 5 °, then the angle of speculum and vertical direction is 10 °.
According to a further embodiment of the invention, provide a kind of multipass amplifying device, comprising a loop structure.
As shown in Figure 4, this multipass amplifying device comprises:
Laser working medium, its side near pumping source is coated with the identical reflectance coating of optical maser wavelength that is exaggerated with need; The no longer as shown in Figure 1 vertical placement of laser that laser working medium and the need of incident are exaggerated, laser working medium (for example vertically tilts low-angle, 4 °～8 °, adopt less angle to be because will consider the angle of pump light and laser working medium) place; With
For conveniently understanding light path, in Fig. 4, with the light path that 1. 2. 3. 4. 5. represents the first half section of dashed lines labeled, the light path of second half section is returned along former road.Detailed process is as follows:
1) laser that is exaggerated of the need of incident enters laser working medium, amplifies the 1st journey;
2) because laser working medium is coated with reflectance coating, the laser that need be exaggerated is reflected, and amplifies the 2nd journey;
3) because laser working medium vertically tilts, and the laser that the need that are reflected are exaggerated no longer returns by former road, but incides on the speculum 1, through speculum 2 reflections, again enter laser working medium again, amplify the 3rd journey;
4) through the reflection of laser working medium reflectance coating, amplify the 4th journey;
5) laser that the need that are reflected are exaggerated incides on the speculum 3, and the laser that the need that are reflected back are exaggerated incides on the laser working medium, amplifies the 5th journey;
6) through the reflection of laser working medium reflectance coating, amplify the 6th journey;
After laser amplifier the 6th journey that 7) need be exaggerated, incide on the speculum 2, through speculum 1 reflection, again enter laser working medium again, amplify the 7th journey;
8) through the reflection of laser working medium reflectance coating, amplify the 8th journey; At last, the laser after the amplification returns along the opposite direction of initial incident direction.
Through above-mentioned light path process, eight processes of the laser that the need of incident are exaggerated laser working medium, i.e. eight Cheng Fangda.Wherein speculum 1 and speculum 2 makeup ring line structures, speculum 3 forms catoptric arrangements.
The object lesson of embodiment shown in Fig. 4 (sketch is shown in Fig. 5 b) shown in Fig. 5 a.Wherein, laser working medium angle of inclination vertically is 5 °; The laser bore that the need of incident are exaggerated is 8mm; The bore of speculum 1 is 20mm, and thickness is 5mm, and angle of inclination vertically is 50 °; The bore of speculum 2 is 20mm, and thickness is 5mm, and angle of inclination vertically is 50 °; The bore of speculum 3 is 15mm, and thickness is 5mm, and angle of inclination vertically is 20 ° (parasang among the figure all is mm).
According to a further embodiment of the invention, provide a kind of multipass amplifying device, comprising two loop structures.
As shown in Figure 6, this multipass amplifying device comprises:
Laser working medium, its side near pumping source is coated with the identical reflectance coating of optical maser wavelength that is exaggerated with need; The no longer as shown in Figure 1 vertical placement of laser that laser working medium and the need of incident are exaggerated, the laser working medium low-angle (for example, 4 °～8 °) that vertically tilts is placed; With
The first loop structure comprises speculum 1, speculum 2, receives the laser from reflectance coating, and laser reflection is returned laser working medium, and laser no longer enters this loop structure after the reflectance coating reflection;
The second servo loop structure comprises speculum 3, speculum 4, receive the laser of the first loop structure and laser reflection is returned laser working medium, and laser no longer enters this loop structure after the reflectance coating reflection; With
Catoptric arrangement comprises speculum 5, and the laser that receives from the second servo loop structure also is reflected back the second servo loop structure with this laser along former road.
Above-mentioned the first loop structure, second servo loop structure and catoptric arrangement cooperate makes the laser that need be exaggerated repeatedly pass through laser working medium, and the opposite direction along incident direction is returned after amplification.
Continuation is with reference to figure 6, and the light path of this multipass amplifying device is described below:
1) laser that is exaggerated of the need of incident enters laser working medium, amplifies the 1st journey;
2) because laser working medium is coated with reflectance coating, the laser reflection that need be exaggerated amplifies the 2nd journey;
3) because laser working medium vertically has inclination, 1) laser that the need that are reflected back the laser that the need that are reflected back in are exaggerated no longer returns by former road, 1) are exaggerated incides on the speculum 1, again through speculum 2 reflections, again enter laser working medium, amplify the 3rd journey;
4) laser amplifies the 4th journey through the reflection of laser working medium reflectance coating;
5) laser that is exaggerated of the need of outgoing incides on the speculum 3, through speculum 4 reflections, again enters laser working medium again, amplifies the 5th journey;
6) laser amplifies the 6th journey through the reflection of laser working medium reflectance coating.
7) laser that is exaggerated of the need of outgoing incides on the speculum 5, through speculum 5 reflections, again enters laser working medium, amplifies the 7th journey;
8) laser amplifies the 8th journey through the reflection of laser working medium reflectance coating.
After laser amplifier the 8th journey that 9) need be exaggerated, incide on the speculum 4, through speculum 3 reflections, again enter laser working medium, amplify the 9th journey;
10) laser amplifies the 10th journey through the reflection of laser working medium reflectance coating.
11) laser that is exaggerated of the need of outgoing incides on the speculum 2, through speculum 1 reflection, again enters laser working medium, amplifies the 11st journey;
12) through the reflection of laser working medium reflectance coating, amplify the 12nd journey.At last, by 1) in the laser that is exaggerated along the need of incident oppositely return.
The object lesson of embodiment shown in Fig. 6 is shown in Fig. 7 a: laser working medium angle of inclination vertically is 5 °; Speculum 1 angle of inclination vertically is 50 °; Speculum 2 angle of inclination vertically is 50 °; Speculum 3 angle of inclination vertically is 55 °; Speculum 4 angle of inclination vertically is 55 °; Speculum 5 angle of inclination vertically is 30 °.
The more detailed analysis with reference to figure 7b (shows for convenient, avoid light path overlapping, the position of the second loop structure among Fig. 7 b is placed on after the first ring line structure), speculum 1 forms catoptric arrangement with speculum 2, speculum 1 and speculum 2 are take horizontal line as symmetry axis, and axial symmetry is placed.
Laser working medium (reflectance coating) angle of inclination vertically is 5 ° (angle θ).The laser of horizontal direction incident (filled arrows) is through after the reflectance coating reflection, with the horizontal direction angle be 10 ° (2 θ).
Laser vertically is reflected to speculum 2 after being reflected the speculum 1 that arrives the first ring line structure, so the incident ray of speculum 1 and the angle between the reflected ray are 80 ° (90 ° of-2 θ), so the angle of speculum 1 and vertical direction be 50 ° (
Namely 45 °+θ).
After laser is reflected the speculum 3 that arrives the second loop structure, the speculum 3 of the second loop structure reflexes to speculum 4 with this incident laser along vertical direction, so the incident of speculum 3 and reflection ray angle are 70 ° (90 ° of-4 θ), the angle of speculum 3 and vertical direction be 55 ° (
I.e. 45 °+2 θ).
Because the speculum 5 of catoptric arrangement will reflect back incident laser according to former road, so the angle of its normal and incident laser is 0 °, the angle of itself and vertical direction is 30 ° (6 θ).
Through above-mentioned analysis, in loop structure, comprise the speculum that two axial symmetry take horizontal line as symmetry axis arrange, can sum up the placed angle of the speculum in loop structure and the catoptric arrangement:
Suppose that laser working medium (reflectance coating) angle of inclination vertically is θ,
The angle γ of the speculum in the i loop structure and vertical direction is:
γ＝45°+i×θ
The angle ρ of the speculum in the catoptric arrangement and vertical direction is:
ρ=2 θ+I * 2 θ, i.e. ρ=2 θ * (1+I),
Wherein, I is the total quantity of device intermediate ring road structure.
It should be noted that in above-described embodiment, in loop structure, the laser between two speculums is vertically advanced not necessarily, and the symmetrical structure of this loop internal reflector is convenient for convenience of calculation, machinery, is beneficial to the light modulation operation.In other embodiments of the invention, the laser between two speculums also can be along vertical direction, as long as loop structure can be with the laser reflection back reflective film that receives.
It should be noted that the loop structure shown in above-described embodiment is comprised of two speculums, in other embodiments of the invention, also can be formed by a plurality of speculums, or be formed by other optical elements, as long as can be with the laser reflection back reflective film that receives.
It will be appreciated by those skilled in the art that, the quadruple pass that shows in above-described embodiment, eight journeys, 12 Cheng Fangda light paths, and laser working medium angle of inclination vertically is 5 ° in light path, all be in order to embody a kind of concrete execution mode of thought of the present invention, the scope that is not intended to limit the present invention.The quantity of the loop structure that comprises in the multipass amplifying device is restriction not.
The present invention proposes a kind of multipass amplifying device that is applied to hold the pumping image intensifer, make and to be exaggerated laser and repeatedly to pass through (namely walk several journeys) more in laser working medium inside, take full advantage of the energy that pumping source pumping laser working media discharges, improve capacity usage ratio, be beneficial to laser amplifier to the trend development of miniaturization, the energy of simultaneously laser output is highly stable.
Should be noted that and understand, in the situation that do not break away from the desired the spirit and scope of the present invention of accompanying claim, can make to the present invention of foregoing detailed description various modifications and improvement.Therefore, the scope of claimed technical scheme is not subjected to the restriction of given any specific exemplary teachings.
Claims (3)
1. multipass amplifying device that is applied to hold the pumping image intensifer, described end pumping image intensifer comprises laser working medium, its side near pumping source is coated with reflectance coating, the laser that this reflectance coating reflection need be exaggerated;
This multipass amplifying device comprises:
The first ring line structure be used for receiving the laser from reflectance coating, and with laser reflection back reflective film, described first ring line structure comprises two speculums;
The second loop structure be used for receiving from the laser of first ring line structure through the reflectance coating reflection, and with laser reflection back reflective film, described the second loop structure comprises two speculums; With
Catoptric arrangement be used for to receive from the laser of the second loop structure through the reflectance coating reflection, and this laser is reflected back laser working medium according to the opposite direction of incident direction, and described catoptric arrangement comprises a speculum;
Wherein, there is non-vanishing angle between the normal vector of described reflectance coating and the first direction, the incident direction of the laser that described need are exaggerated is first direction, it is second direction that two speculums in the described loop structure are arranged in the laser direct of travel that reflects between the two, and this second direction is vertical with described first direction;
Described two speculums in the i loop structure and the angle γ of second direction are:
γ=45°+i×θ
The angle ρ of the speculum in the catoptric arrangement and second direction is:
ρ=2θ×（1+I）
Wherein, θ represents the normal vector of described reflectance coating and the angle between the first direction, and i is 1 or 2, I=2.
2. multipass amplifying device according to claim 1, wherein,
Two speculums in the described first ring line structure are respectively the first speculum and the second speculum, and two speculums in described the second loop structure are respectively the 3rd speculum and the 4th speculum, and the speculum in the described catoptric arrangement is the 5th speculum;
Described the first speculum be used for to receive the laser from reflectance coating, and with this laser reflection to the second speculum;
Described the second speculum be used for to receive the laser from the first speculum, and with this laser reflection to reflectance coating;
Described reflectance coating also is used for laser is reflexed to the 3rd speculum again;
Described the 3rd speculum is used for receiving the laser from reflectance coating, and with this laser reflection to the four speculums;
Described the 4th speculum be used for to receive the laser from the 3rd speculum, and with this laser reflection to reflectance coating;
Described reflectance coating also is used for laser is reflexed to the 5th speculum again;
Described the 5th speculum be used for to receive the laser from reflectance coating, and with this laser reflection to reflectance coating.
3. multipass amplifying device according to claim 1, wherein, angle theta is 4 °～8 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210123627 CN102646918B (en) | 2012-04-25 | 2012-04-25 | Multi-pass amplification device applied to end-pumped laser amplifier |
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| CN 201210123627 CN102646918B (en) | 2012-04-25 | 2012-04-25 | Multi-pass amplification device applied to end-pumped laser amplifier |
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| US7006283B2 (en) * | 2002-01-15 | 2006-02-28 | Jds Uniphase Corporation | Three-dimensional optical amplifier structure |
| CN201365063Y (en) * | 2009-02-18 | 2009-12-16 | 中国科学院上海光学精密机械研究所 | End-pumped order-gradient doping composite slat laser amplifier |
| CN201430340Y (en) * | 2009-04-03 | 2010-03-24 | 北京国科世纪激光技术有限公司 | Multi-pass laser amplifying device |
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