CN110600979A - Pyramid prism folding cavity laser - Google Patents
Pyramid prism folding cavity laser Download PDFInfo
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- CN110600979A CN110600979A CN201910820135.5A CN201910820135A CN110600979A CN 110600979 A CN110600979 A CN 110600979A CN 201910820135 A CN201910820135 A CN 201910820135A CN 110600979 A CN110600979 A CN 110600979A
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
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Abstract
The invention relates to a novel opposed pyramid prism folding cavity laser, which utilizes the reflection characteristic of an opposed pyramid prism to enable resonant beams to be reflected back and forth between two pyramid prisms, and can effectively increase the cavity length of a resonant cavity; the laser can obviously increase the cavity length in a smaller space, and simultaneously ensures the anti-detuning characteristic of the laser resonant cavity.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to an opposed pyramid prism folded cavity laser.
Background
The resonator is an essential component of a solid-state laser and can provide positive feedback to the laser and control the characteristics of the oscillating beam in the cavity. The length of the laser cavity is an important parameter of the laser.
For a Q-switched pulse solid laser, the pulse width is difficult to accurately control, the Q-switched pulse width can be effectively controlled by adjusting the length of a resonant cavity, but the Q-switched pulse width is insensitive to the change of the laser cavity length, and sometimes the Q-switched pulse width can be obviously increased by greatly increasing the length of the resonant cavity.
Especially for some single-mode lasers, in many application fields, it is necessary to provide a longer resonant cavity to obtain a sufficient pulse width, and directly increasing the cavity length will significantly increase the volume of the laser, which will be disadvantageous for the miniaturization design of the laser.
In order to increase the length of the cavity in a limited volume, the most efficient way is to design the cavity in the form of a folded oscillation.
However, the stability of the folded cavity laser is often reduced due to a large number of reflecting devices, and the laser is very easy to be out of order.
Disclosure of Invention
In order to realize a longer resonant cavity design in a space as small as possible and ensure the anti-detuning characteristic of laser, the invention designs the pyramid prism folded cavity laser by utilizing the reflection characteristic of the opposite pyramid prism, so that the cavity length can be obviously increased in a smaller space and the anti-detuning characteristic of the laser resonant cavity is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pyramid prism folding cavity laser comprises a first pyramid prism, a second pyramid prism, an output mirror and a total reflection mirror, wherein the first pyramid prism and the second pyramid prism are oppositely arranged, the output mirror and the total reflection mirror are arranged on the inner side or the outer side between the first pyramid prism and the second pyramid prism, and the first pyramid prism, the second pyramid prism, the output mirror and the total reflection mirror form a resonant cavity; the laser comprises a laser body, a gain medium, a pumping module, a polarizer, a Q switch, a first lambda/4 wave plate, a plurality of second lambda/4 wave plates and a plurality of third lambda/4 wave plates, wherein the gain medium and the pumping module are used as a pumping source of the laser body, the polarizer is used for realizing Q-switched output of the laser body, the Q switch and the first lambda/4 wave plates are arranged between the first pyramid prism and the second pyramid prism, the plurality of second lambda/4 wave plates are used for compensating the depolarization effect of the first pyramid prism, the plurality of third lambda/4 wave plates are arranged between the first pyramid prism and the second pyramid prism, the resonant light beam with the diameter of D is reflected between the first pyramid prism and the second pyramid prism for N times in a reciprocating mode, the lengthThe distance delta Y of the deviation of the vertex of the pyramid prism in the beam direction satisfies。
Furthermore, the output mirror and the full-reflecting mirror are arranged between the first pyramid prism and the second pyramid prism to form an opposed pyramid prism folding cavity, the output mirror and the full-reflecting mirror are coplanar, the polarizer, the Q switch and the first lambda/4 wave plate which are sequentially arranged are arranged between the second pyramid prism and the full-reflecting mirror, the pumping module is arranged between the second pyramid prism and the output mirror, and the third lambda/4 wave plate is arranged between the polarizer and the second pyramid prism.
Furthermore, the output mirror and the full-reflecting mirror are arranged between the first pyramid prism and the second pyramid prism to form an opposed pyramid prism folding cavity, the polarizer, the Q switch and the first lambda/4 wave plate which are sequentially arranged are arranged between the first pyramid prism and the full-reflecting mirror, the pumping module is arranged between the second pyramid prism and the output mirror, and the second lambda/4 wave plate is arranged between the first pyramid prism and the polarizer.
Furthermore, the output mirror and the total reflection mirror are arranged on the same side of the first pyramid prism and the second pyramid prism to form an opposite pyramid prism folding cavity; the output mirror and the total reflection mirror are coplanar, the vertex of the first pyramid prism is cut off to be used as a light transmission surface and is coated with a laser waveband antireflection film, the polarizer, the Q switch and the first lambda/4 wave plate which are sequentially arranged are arranged between the second pyramid prism and the total reflection mirror, and the pumping module is arranged between the light transmission surface of the cut-off part and the output mirror.
Furthermore, the output mirror and the total reflection mirror are arranged on the opposite sides of the first pyramid prism and the second pyramid prism to form an opposed pyramid prism folding cavity, the vertex of the second pyramid prism is cut off to be used as a light transmission surface and plated with a laser waveband antireflection film, the polarizer, the Q switch and the first lambda/4 wave plate which are sequentially arranged are arranged between the light transmission surface of the cut-off part and the total reflection mirror, and the pumping module is arranged between the second pyramid prism and the output mirror.
The invention has the beneficial effects that:
the folded cavity laser device has a simple structure, and resonant beams are reflected back and forth between two corner-cube prisms by using the reflection characteristic of the opposite corner-cube prism, so that the cavity length of a resonant cavity can be effectively increased.
2, the structure of the invention can ensure the anti-detuning characteristic of the laser resonant cavity.
Drawings
FIG. 1 is a block diagram of a first embodiment of the present invention;
FIG. 2 is a block diagram of a second embodiment of the present invention;
FIG. 3 is a block diagram of a third embodiment of the present invention;
fig. 4 is a structural view of a fourth embodiment of the present invention.
The figures are numbered: 1-a first pyramid prism, 2-a second pyramid prism, 3-an output mirror, 4-a total reflection mirror, 5-a pumping module, 6-a polarizer, 7-a Q switch, 8-a first lambda/4 wave plate, 9-a resonant beam, 10-a second lambda/4 wave plate and 11-a third lambda/4 wave plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1, the opposed pyramid prism folded cavity laser disclosed by the invention is composed of a first pyramid prism 1, a second pyramid prism 2, an output mirror 3, a total reflection mirror 4, a pumping module 5, a polarizer 6, a Q switch 7, a first lambda/4 wave plate 8, a second lambda/4 wave plate 10 and a third lambda/4 wave plate 11. The first pyramid prism 1, the second pyramid prism 2, the output mirror 3 and the total reflection mirror 4 form an opposite pyramid prism resonant cavity of the laser, and the output mirror 3 and the total reflection mirror 4 are coplanar and are arranged between the first pyramid prism 1 and the second pyramid prism 2. The light-passing surfaces of the first pyramid prism 1 and the second pyramid prism 2 are opposite, the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 which are sequentially arranged are arranged between the second pyramid prism 2 and the full-reflecting mirror 4, and the pumping module 5 is arranged between the second pyramid prism 2 and the output mirror 3.
Because of the reflection characteristic of the pyramid prism, the resonant cavity of the laser has the anti-detuning characteristic (refer to 'an anti-detuning solid laser', patent number: CN 20140374927.1), when the resonant cavity of the laser generates a certain mechanical deformation, the optical parallelism of the output mirror 3 and the total reflection mirror 4 can be still ensured, and further the output stability of the laser is ensured. The second lambda/4 wave plate 10 is arranged between the first pyramid prism 1 and the total reflection mirror 4, the third lambda/4 wave plate 11 is arranged between the polarizer 6 and the second pyramid prism 2, the second lambda/4 wave plate 10 is used for compensating the depolarization effect of the first pyramid prism 1, and the third lambda/4 wave plate 11 is used for compensating the depolarization effect of the second pyramid prism 2 (refer to patent 'an anti-detuning solid laser', patent number: CN 20140374927.1). The pumping module 5 is a gain medium and a pumping source of the laser, and the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 can realize the boost Q-switched output of the laser.
The resonant beam 9 having a diameter d is reflected back and forth between the first corner cube 1 and the second corner cube 2, greatly increasing the length of the resonant optical path. The apexes of the first and second corner prisms 1 and 2 are spaced apart by Δ Y in the Y direction. When the resonant beam 9 is reflected back and forth between the first pyramid prism 1 and the second pyramid prism 2, the distance between adjacent light rays is D, and the position relationship of the first pyramid prism 1 and the second pyramid prism 2 in the Y direction can be obtained from the geometric relationship of the resonant cavity as follows:。
example 2
Referring to fig. 2, as another embodiment, the difference from embodiment 1 is that: the output mirror 3 and the total reflection mirror 4 are arranged between the first pyramid prism 1 and the second pyramid prism 2 but are not coplanar, and the first pyramid prism 1, the second pyramid prism 2, the output mirror 3 and the total reflection mirror 4 form an opposite pyramid prism resonant cavity of the laser. The polarizer 6, the Q-switch 7 and the first lambda/4-wave plate 8, which are arranged in sequence, are arranged between the first pyramid prism 1 and the fully-reflecting mirror 4, and the pumping module 5 is arranged between the second pyramid prism 2 and the output mirror 3, wherein the second lambda/4-wave plate 10 is arranged between the first pyramid prism 1 and the polarizer 6, and the third lambda/4-wave plate 11 is arranged between the Q-switch 7 and the second pyramid prism 2.
Even if a fixed angle of the first and second corner prisms 1 and 2 occurs due to the reflection characteristics of the corner prismsThe optical parallelism of the output mirror 3 and the total reflection mirror 4 can still be ensured by fixed change, thereby ensuring the stable output of the laser. The second lambda/4 wave plate 10 is used for compensating the depolarization effect of the first pyramid prism 1, and the third lambda/4 wave plate 11 is used for compensating the depolarization effect of the second pyramid prism 2. The pumping module 5, the polarizer 6, the Q-switch 7 and the first lambda/4 wave plate 8 are arranged between the first corner cube prism 1 and the second corner cube prism 2. The pumping module 5 is a gain medium and a pumping source of the laser, and the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 can realize the boost Q-switched output of the laser. The resonant beam 9 is reflected back and forth between the first corner cube 1 and the second corner cube 2, greatly increasing the length of the resonant optical path. The apexes of the first and second corner prisms 1 and 2 are spaced apart by Δ Y in the Y direction. When the resonant beam 9 is reflected back and forth between the first pyramid prism 1 and the second pyramid prism 2, the distance between adjacent light rays is D, and the position relationship of the first pyramid prism 1 and the second pyramid prism 2 in the Y direction can be obtained from the geometric relationship of the resonant cavity as follows:。
example 3
Referring to fig. 3, as another embodiment, the difference from embodiment 1 is that: the output mirror 3 and the total reflection mirror 4 are arranged on the same side of the first pyramid prism 1 and the second pyramid prism 2 to form an opposite pyramid prism folding cavity, the output mirror 3 and the total reflection mirror 4 are coplanar, the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 which are sequentially arranged are arranged between the second pyramid prism 2 and the total reflection mirror 4, and the pumping module 5 is arranged between the cut-off light-passing surface and the output mirror 3. The vertex of the first pyramid prism 1 needs to be cut off to be used as a light transmitting surface, and a laser wave band antireflection film is plated on the vertex.
Because the reflection characteristic of the pyramid prism can make the resonant cavity of the laser have the anti-detuning characteristic, when the resonant cavity of the laser generates certain mechanical deformation, the optical parallelism of the output mirror 3 and the total reflection mirror 4 can still be ensured, and then the output stability of the laser is ensured. The second lambda/4 wave plate 10 is used for compensating the depolarization effect of the first pyramid prism 1, and the third lambda/4 wave plate 11 is used for compensating the depolarization effect of the second pyramid prism 2. The pumping module 5 is a gain medium of a laserAnd the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 can realize the boosting and Q-switching output of the laser. The pumping module 5, the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 are arranged on the left side of the first pyramid prism 1 and the second pyramid prism 2. The resonant beam 9 is reflected back and forth between the first corner cube 1 and the second corner cube 2, greatly increasing the length of the resonant optical path. The apexes of the first and second corner prisms 1 and 2 are spaced apart by Δ Y in the Y direction. When the resonant beam 9 is reflected back and forth between the right-angle cone prism 1 and the right-angle cone prism 2, the distance between adjacent light rays is D, and the position relation of the first pyramid prism 1 and the second pyramid prism 2 in the Y direction can be obtained according to the geometrical relation of the resonant cavity as follows:。
example 4
Referring to fig. 4, as another embodiment, the difference from embodiment 1 is that: the output mirror 3 and the total reflection mirror 4 are arranged on the opposite sides of the first pyramid prism 1 and the second pyramid prism 2, the vertex of the second pyramid prism 2 needs to be cut off to be used as a light transmission surface and is plated with a laser waveband antireflection film, the polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 which are sequentially arranged are arranged between the light transmission surface of the cut-off part and the total reflection mirror 4, and the pumping module 5 is arranged between the second pyramid prism 2 and the output mirror 3.
Due to the reflection characteristic of the pyramid prism, even if the fixed angles of the first pyramid prism 1 and the second pyramid prism 2 are changed to a certain degree, the optical parallelism of the output mirror 3 and the total reflection mirror 4 can be still ensured, and the output stability of the laser is further ensured. The second lambda/4 wave plate 10 is used for compensating the depolarization effect of the first pyramid prism 1, and the third lambda/4 wave plate 11 is used for compensating the depolarization effect of the second pyramid prism 2. The pumping module 5 is a gain medium and a pumping source of the laser and is arranged on the left side of the first corner cube prism 1 and the second corner cube prism 2. The polarizer 6, the Q switch 7 and the first lambda/4 wave plate 8 are arranged on the right sides of the first pyramid prism 1 and the second pyramid prism 2, and the boosting and Q-switching output of the laser can be realized. The resonant beam 9 is reflected back and forth between the first corner cube 1 and the second corner cube 2, greatly increasing the length of the resonant optical path. The tops of the first and second corner prisms 1 and 2The dots are spaced in the Y direction by Δ Y. When the resonant beam 9 is reflected back and forth between the first pyramid prism 1 and the second pyramid prism 2, the distance between adjacent light rays is D, and the position relationship of the first pyramid prism 1 and the second pyramid prism 2 in the Y direction can be obtained from the geometric relationship of the resonant cavity as follows:。
the scope of the invention is not limited to the embodiments described above.
Claims (5)
1. The utility model provides a pyramid prism folded cavity laser which characterized in that: the resonant cavity comprises a first pyramid prism (1) and a second pyramid prism (2) which are arranged oppositely, and an output mirror (3) and a full-reflecting mirror (4) which are arranged at the inner side or the outer side of the first pyramid prism (1) and the second pyramid prism (2), wherein the first pyramid prism (1), the second pyramid prism (2), the output mirror (3) and the full-reflecting mirror (4) form a resonant cavity; the laser device is characterized by further comprising a pumping module (5) serving as a gain medium and a pumping source, a polarizer (6) for realizing Q-switched output, a Q switch (7) and a first lambda/4 wave plate (8), a plurality of second lambda/4 wave plates (10) for compensating the depolarization effect of the first pyramid prism (1) and a plurality of third lambda/4 wave plates (11) for compensating the depolarization effect of the second pyramid prism (2) are respectively arranged between the first pyramid prism (1) and the second pyramid prism (2), resonant light beams (9) are reflected between the first pyramid prism (1) and the second pyramid prism (2) for N times in a reciprocating mode, the distance between every two adjacent light beams is D, and the deviation distance delta Y between the vertex of the first pyramid prism (1) and the vertex of the second pyramid prism (2) in the light beam direction meets the requirement that the deviation distance delta Y between the vertex of the first pyramid prism。
2. A corner cube folded cavity laser according to claim 1, wherein the output mirror (3) and the all-reflecting mirror (4) are arranged between the first corner cube (1) and the second corner cube (2), the output mirror (3) and the all-reflecting mirror (4) are coplanar, the polarizer (6), the Q-switch (7) and the first λ/4 plate (8) arranged in sequence are arranged between the second corner cube (2) and the all-reflecting mirror (4), the pumping module (5) is arranged between the second corner cube (2) and the output mirror (3), and wherein the third λ/4 plate (11) is arranged between the polarizer (6) and the second corner cube (2).
3. A corner cube folded cavity laser according to claim 1, wherein the output mirror (3) and the all-mirror (4) are disposed between the first corner cube (1) and the second corner cube (2), the polarizer (6), the Q-switch (7) and the first λ/4 plate (8) arranged in sequence are disposed between the first corner cube (1) and the all-mirror (4), the pumping module (5) is disposed between the second corner cube (2) and the output mirror (3), and wherein the second λ/4 plate (10) is disposed between the first corner cube (1) and the polarizer (6).
4. The corner cube folded cavity laser according to claim 1, wherein the output mirror (3) and the total reflection mirror (4) are disposed on the same side of the first corner cube (1) and the second corner cube (2), the output mirror (3) and the total reflection mirror (4) are coplanar, the vertex of the first corner cube (1) is cut out as a light-transmitting surface and coated with a laser band antireflection film, the polarizer (6), the Q-switch (7) and the first λ/4 wave plate (8) which are sequentially arranged are disposed between the second corner cube (2) and the total reflection mirror (4), and the pumping module (5) is disposed between the cut-out light-transmitting surface and the output mirror (3).
5. The pyramid prism folded cavity laser according to claim 1, wherein the output mirror (3) and the all-reflecting mirror (4) are disposed on opposite sides of the first pyramid prism (1) and the second pyramid prism (2), the vertex of the second pyramid prism (2) is cut out as a light-passing surface and coated with a laser band antireflection film, the polarizer (6), the Q-switch (7) and the first λ/4 wave plate (8) arranged in sequence are disposed between the cut-out light-passing surface and the all-reflecting mirror (4), and the pumping module (5) is disposed between the second pyramid prism (2) and the output mirror (3).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111525378A (en) * | 2020-03-20 | 2020-08-11 | 北京国泰蓝盾科技有限公司 | A miniaturized passive Q laser that transfers for airborne laser illumination ware |
| CN112271542A (en) * | 2020-09-11 | 2021-01-26 | 长春理工大学 | Self-adaptive stable resonant cavity laser |
| CN112636143A (en) * | 2020-12-04 | 2021-04-09 | 湖北久之洋红外系统股份有限公司 | Anti-detuning type multi-time folding resonant cavity laser |
| US11870207B1 (en) * | 2022-10-20 | 2024-01-09 | Changchun Institute Of Optics, Fine Mechanics And Physics, Chinese Academy Of Sciences | Laser device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111525378A (en) * | 2020-03-20 | 2020-08-11 | 北京国泰蓝盾科技有限公司 | A miniaturized passive Q laser that transfers for airborne laser illumination ware |
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