CN221126529U - End-pumped multichannel laser amplification device - Google Patents
End-pumped multichannel laser amplification device Download PDFInfo
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- CN221126529U CN221126529U CN202322732806.7U CN202322732806U CN221126529U CN 221126529 U CN221126529 U CN 221126529U CN 202322732806 U CN202322732806 U CN 202322732806U CN 221126529 U CN221126529 U CN 221126529U
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- 238000005086 pumping Methods 0.000 claims abstract description 21
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- 238000007493 shaping process Methods 0.000 claims description 13
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- 229910009372 YVO4 Inorganic materials 0.000 description 1
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Abstract
The utility model relates to an end-pumped multichannel laser amplifying device, which comprises a pumping source, a laser coupling collimation focusing unit, a laser amplifying unit and an optical signal source unit, wherein a columnar aspheric mirror is added between the laser coupling collimation focusing unit and the laser amplifying unit, gaussian beams can be shaped into flat-top beams distributed along an x axis or a y axis, and the flat-top beams can change an activation working area of a laser crystal from basic Gaussian beam distribution to energy distribution meeting multichannel requirements, so that optical signals can be amplified through the activation area of the laser crystal for multiple times. The device simple structure, convenient operation, the columnar aspheric mirror changes the active area distribution of crystal working substance according to the light path design for the optical signal can pass through laser crystal many times and amplify, improves laser amplifier's amplification efficiency furthest.
Description
Technical Field
The utility model relates to the technical field of optics, in particular to an end-pumped multichannel laser amplifying device.
Background
A laser amplifier is a device capable of enhancing the intensity of a laser signal, which expands an optical signal using excited atoms or molecules, thereby generating a high-power, high-brightness laser beam. Laser amplifiers are widely used in many fields including communications, medicine, research, industry, defense, and the like. In the field of all-solid-state lasers, an important application of a laser amplifier is to amplify seed light energy with a small half-width of pulse width and wavelength spectrum line to obtain a laser beam with a high power and a narrow pulse width and a narrow frequency spectrum.
The traditional laser amplifier based on the bulk crystal has the advantages of simple structure, mature module, no need of an additional complex shaping system and the like, has good market share and development prospect, and is gradually controllable along with the continuous development of high-efficiency semiconductor laser pumping technology and various customized Nd ion doped laser crystals, and the light beam quality deterioration condition in the amplifying process is gradually controlled. However, for ultra-short pulses with high peak power, the problems of self-oscillation, laser damage and the like caused by gain in the amplifying process still exist. Therefore, under the condition of ensuring the amplification efficiency, how to obtain the laser amplification system with simple and compact structure and convenient thermal management is still a direction which can be explored.
Disclosure of Invention
In order to solve the problems, the utility model provides an end-pumped multichannel laser amplifying device, which utilizes a columnar aspheric lens to change the activation surface of an activation crystal from basic Gaussian beam distribution to energy distribution meeting multichannel requirements, and an optical signal emitted by an optical signal source is folded back for multiple times in an activation area of the laser crystal to be amplified. The specific technical scheme is as follows:
The end-pumped multichannel laser amplification device comprises a pumping source, a laser coupling collimation focusing unit, a laser amplification unit and an optical signal source unit, wherein the laser coupling collimation focusing unit, the laser amplification unit and the optical signal source unit are arranged above the laser amplification unit in the emergent direction of a pumping beam of the pumping source, a columnar aspheric lens is arranged between the laser coupling collimation focusing unit and the laser amplification unit, the columnar aspheric lens can shape a pumping Gaussian beam into a flat-top beam, an activation working area of the laser amplification unit can be extended along the folding direction of signal light by the flat-top beam, and the coherence volume of the activation working area and the signal light is increased.
Further, the laser coupling collimation focusing unit sequentially comprises a coupling optical fiber, a collimation lens and a focusing lens; the laser amplifying unit comprises a dichroic mirror, an activated crystal, a reflecting mirror group, a first turning mirror, a second turning mirror and an aspheric cylindrical lens, wherein the dichroic mirror and the reflecting mirror group are positioned at two sides of the activated crystal and are vertically and parallelly arranged, the first turning mirror is positioned above the dichroic mirror and the laser crystal and is arranged at a certain angle with the dichroic mirror, the second turning mirror is positioned below the laser crystal and the reflecting mirror group and is arranged at a certain angle with the reflecting mirror group, and the aspheric cylindrical lens is positioned under the second turning mirror.
The optical signal source unit is positioned right above the first turning mirror and comprises an optical signal source and a shaping lens group below the optical signal source unit.
Furthermore, the core diameters of the two ends of the coupling optical fiber are 400-600 mu m, and the numerical aperture of the output end is 0.15-0.2.
Furthermore, the collimating lens and the focusing lens are plano-convex lenses, the convex surface of the collimating lens is opposite to the convex surface of the focusing lens, and the curvature of the curved surface of the collimating lens is smaller than that of the focusing lens.
Further, the columnar aspherical mirror is a columnar lens with a secondary aspherical coefficient of-0.09 to-0.11.
Further, the laser crystal is a uniformly doped solid laser working substance or a crystal doped or bonded in a gradient way, and the output wavelength of the pumping source is matched with the absorption peak of the absorption spectrum of the laser crystal.
Further, the middle position of the laser crystal coincides with the beam waist position of the pump beam emitted by the focusing lens.
Further, the laser crystal is held by a crystal seat passing through a water cooling channel after wrapping the indium film.
Further, the transmittance of the dichroic mirror for the wavelength of the pumping light is more than 99%, the reflectance for the wavelength of the signal light is more than 99%, and the reflecting mirror group is a series of film-coated lenses which reflect the wavelength light beam of the signal source and transmit the spontaneous emission wavelength and the pumping wavelength of the crystal.
Further, the shaping lens group is a group of concave-convex lenses and is used for controlling the beam divergence angle and the light spot size of the optical signal source.
Compared with the prior art, the end-pumped multichannel laser amplifier has the following beneficial effects:
The end-pumped multichannel laser amplifying device provided by the utility model has the advantages that the structure is simple, the manufacturing operation is convenient, the coherent volumes of the laser crystal and the signal light are adjusted in a mode of adding the columnar aspheric lens between the laser coupling collimation focusing unit and the laser amplifying unit, the power density of the pump light can be reduced compared with the common amplifying structure when the magnification ratio is the same, and the optical damage is avoided; meanwhile, due to the adoption of the scheme of repeated turn-back and passing of the signal light, the overall amplification efficiency and stability are improved on the premise of ensuring that the energy distribution of the output light spots is not degraded.
Drawings
For a clearer description of embodiments of the utility model or of solutions in the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an end-pumped multi-path laser amplification apparatus according to the present utility model;
FIG. 2 is a schematic diagram of a signal light path of an end-pumped multi-path laser amplification device according to the present utility model;
1-a pump source; 2-coupling an optical fiber; 3-a collimating lens; 4-focusing lens; 5-a cylindrical aspherical lens; 6-dichroic mirrors; 7-laser crystal; 8-a mirror group; 9-a first turning mirror; 10-a second turning mirror; 11-aspherical cylindrical lenses; 12-an optical signal source; 13-a shaping lens group; 71-Gaussian beam crystal activation plane; 72-crystal active face in the examples.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described in the following with reference to the drawings provided by the present utility model, and advantages and features of the present utility model will be more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected" and "coupled" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be used in any form, such as directly or indirectly through an intermediate medium, or may be used in any form of communication between two elements or in any form of interaction between two elements, and the terms are specifically understood by those of ordinary skill in the art.
In the description of the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Examples: referring to fig. 1, the embodiment provides an end-pumped multichannel laser amplifying device, which comprises a pumping source, a laser coupling collimation focusing unit and a laser amplifying unit, wherein the laser coupling collimation focusing unit and the laser amplifying unit are arranged in the outgoing direction of the pumping beam of the pumping source, an optical signal unit is arranged above the laser amplifying unit, and a columnar aspheric lens 5 is arranged between the laser coupling collimation focusing unit and the laser amplifying unit. The laser coupling collimation focusing unit sequentially comprises a coupling optical fiber 2, a collimation lens 3 and a focusing lens 4, the laser amplifying unit comprises a dichroic mirror 6, an activation crystal 7, a reflecting mirror group 8, a first turning mirror 9, a second turning mirror 10 and an aspheric cylindrical lens 11, the dichroic mirror 6 and the reflecting mirror group 8 are positioned on two sides of the activation crystal 7 and are vertically and parallelly arranged, the first turning mirror 9 is positioned above the dichroic mirror 6 and the laser crystal 7 and is placed at a certain angle with the dichroic mirror 6, the second turning mirror 10 is positioned below the laser crystal 7 and the reflecting mirror group 8 and is placed at a certain angle with the reflecting mirror group 8, and the aspheric cylindrical lens 11 is positioned under the second turning mirror 10. The optical signal source unit is located directly above the first turning mirror 9, and includes an optical signal source 12 and a shaping lens group 13.
In the technical scheme of the utility model, the columnar aspheric lens 5 is arranged between the laser coupling collimation focusing unit and the laser amplifying unit, the Gaussian beam emitted by the focusing lens 4 is shaped into the flat-top beam, and the flat-top beam is provided for the activation crystal 7, so that compared with the Gaussian beam, the activation working area of the activation crystal 7 can be stretched along the folding direction of the signal light from the uniform circle of the energy distribution, the energy distribution of multiple paths is formed, and the light spot sizes of the light beams of all paths are consistent, thereby improving the coherent volume of the laser crystal 7 and the signal light, and amplifying the signal light for multiple times.
Preferably, the pump source 1 is a wavelength-locked semiconductor diode pump source, which can effectively control the quantum loss of the laser crystal.
Preferably, the core diameters of the two ends of the coupling optical fiber 2 are 400-600 μm, the numerical aperture of the output end is 0.15-0.2, and the maximum power of the pump source 1 matched with the coupling optical fiber 2 is not more than 150W when matched with the subsequent collimating lens 3 and focusing lens 4.
Preferably, the collimating lens 3 and the focusing lens 4 are a set of plano-convex lenses with convex surfaces placed opposite each other, and the curvature of the collimating lens 3 is smaller than the curvature of the focusing lens 4 to control the size of the focused spot and the rayleigh length around the length of the laser crystal 7, because the longer the rayleigh length, the more uniform the activation area, both the end face and the interior of the activation crystal need to be activated.
Preferably, the cylindrical aspherical mirror 5 is a cylindrical lens with a secondary aspherical coefficient of-0.99 to-0.11, and is capable of shaping the radiation intensity of the pump beam from a substantially gaussian-shaped profile to a gaussian-like profile extending along the x-axis or the y-axis, and may be specifically a flat-top profile, that is, the cylindrical aspherical mirror 5 is capable of shaping the gaussian beam to a desired flat-top beam.
Preferably, the dichroic mirror 6 has a transmittance of more than 99% for the wavelength of the pump light and a reflectance of more than 99% for the wavelength of the signal light, and is disposed parallel to the mirror group 8 so that the signal light can be folded back therebetween.
Preferably, the laser crystal 7 is a uniformly doped solid laser working substance or a crystal doped or bonded in a gradient way, and in order to control the temperature stability of the laser crystal 7, the laser crystal 7 is held by a crystal seat passing through a water cooling channel after wrapping an indium film, and the water cooling channel is designed according to the crystal heat distribution simulated by software. Meanwhile, the output wavelength of the pump source 1 is matched with the absorption peak of the absorption spectrum of the laser crystal 7, for example, a pump source with the output wavelength of 915nm and Nd with the output wavelength of 1064nm are adopted: YVO4 crystals.
Preferably, the reflecting mirror group 8 is a group of film-coated lenses, which can reflect the signal source beam, transmit the spontaneous emission wavelength and the pumping wavelength of the laser crystal, and make the signal source beam pass through the coherent volume of the laser crystal repeatedly, so that the optical signal source beam is amplified repeatedly.
Preferably, the first turning mirror 9 is used for reflecting the optical signal beam to the dichroic mirror 6, and then reflecting the optical signal beam by the dichroic mirror 6 to enter the active working area of the laser crystal 7, and the second turning mirror 10 is used for reflecting the optical signal source beam amplified multiple times to the shaping aspheric mirror 11.
Preferably, the shaping lens group 13 is a group of concave-convex lenses, which controls the beam divergence angle and the spot size of the optical signal source, and increases the rayleigh length of the optical signal source, so that the beam of the optical signal source is a signal beam waist position when propagating to the crystal surface.
Preferably, the shaping aspherical mirror 11 shapes the output amplified light beam into a gaussian light beam according to the intensity distribution of the amplified light beam, so as to meet the requirements of subsequent processing or nonlinear frequency multiplication operation.
The working principle of the end-pumped multichannel laser amplifying device of the utility model is as follows: the semiconductor diode pump beam emitted by the pump source 1 passes through the coupling optical fiber 2, the beam emitted from the coupling optical fiber 2 has circular and uniform intensity distribution and symmetrical beam quality, the beam passes through the collimating lens 3 and the focusing lens 4, a focusing light spot with uniform size can be formed through collimation and focusing, and then the beam passes through the columnar aspheric mirror 5 and is shaped into a light spot extending along the y axis, and the pump beam waist is controlled at the middle position of the laser crystal 7 so that the phase change of the crystal caused by the thermal effect is more symmetrical; referring to fig. 2, the active surface of the laser crystal 7 is changed from the basic gaussian beam distribution 71 to the energy distribution 72 meeting the multi-path requirement, when the beam of the optical signal source 12 propagates to the crystal surface through the shaping lens group 13, the beam is in the optical signal beam waist position, the optical signal beam is reflected to the dichroic mirror 6 through the first turning mirror 9, enters the active area of the active crystal 7 through the reflection of the dichroic mirror 6, the optical signal beam is repeatedly reflected and turned back between the dichroic mirror 6 and the reflecting mirror group 8, the beam signal achieves the effect of repeated amplification, and the amplified beam is reflected by the second turning mirror 10, is shaped through the aspheric cylindrical lens 11, and then outputs the gaussian beam into the subsequent optical path.
It will be appreciated by those skilled in the art that the utility model can be embodied in many other specific forms without departing from the spirit or scope thereof, and that, based on the embodiments herein, all other embodiments that would be apparent to one skilled in the art without inventive faculty fall within the scope of the utility model.
Claims (10)
1. An end-pumped multichannel laser amplification device is characterized in that: the device comprises a pumping source, a laser coupling collimation focusing unit, a laser amplifying unit and an optical signal source unit arranged above the laser amplifying unit in the emergent direction of the pumping beam of the pumping source, wherein a columnar aspheric lens is arranged between the laser coupling collimation focusing unit and the laser amplifying unit, the columnar aspheric lens can shape the pumping Gaussian beam into a flat-top beam, and the flat-top beam can extend an activation working area of the laser amplifying unit along the folding direction of the signal light so as to increase the coherence volume of the activation working area and the signal light.
2. The end-pumped multi-channel laser amplification apparatus of claim 1, wherein,
The laser coupling collimation focusing unit sequentially comprises a coupling optical fiber, a collimation lens and a focusing lens;
The laser amplifying unit comprises a dichroic mirror, a laser crystal, a reflecting mirror group, a first turning mirror, a second turning mirror and an aspheric cylindrical lens, wherein the dichroic mirror and the reflecting mirror group are positioned at two sides of the laser crystal and are vertically and parallelly arranged, the first turning mirror is positioned above the space between the dichroic mirror and the laser crystal and is arranged at a certain angle with the dichroic mirror, the second turning mirror is positioned below the space between the laser crystal and the reflecting mirror group and is arranged at a certain angle with the reflecting mirror group, and the aspheric cylindrical lens is positioned under the second turning mirror;
The optical signal source unit is positioned right above the first turning mirror and comprises an optical signal source and a shaping lens group below the optical signal source unit.
3. The end-pumped multi-path laser amplification apparatus of claim 2, wherein: the core diameters of the two ends of the coupling optical fiber are 400-600 mu m, and the numerical aperture of the output end is 0.15-0.2.
4. The end-pumped multi-path laser amplification apparatus of claim 2, wherein: the collimating lens and the focusing lens are plano-convex lenses, the convex surface of the collimating lens is opposite to the convex surface of the focusing lens, and the curvature of the curved surface of the collimating lens is smaller than that of the focusing lens.
5. The end-pumped multichannel laser amplification apparatus of claim 1, wherein: the columnar aspherical lens is a columnar lens with the secondary aspherical coefficient of-0.09 to-0.11.
6. The end-pumped multi-path laser amplification apparatus of claim 2, wherein: the laser crystal is a uniformly doped solid laser working substance or a crystal doped or bonded in a gradient way, and the output wavelength of the pumping source is matched with the absorption peak of the absorption spectrum of the laser crystal.
7. The end-pumped multi-path laser amplification apparatus of claim 6, wherein: and the middle position of the laser crystal coincides with the beam waist position of the pumping beam emitted by the focusing lens.
8. The end-pumped multi-path laser amplification apparatus of claim 6, wherein: the laser crystal is held by a crystal seat passing through a water cooling channel after wrapping the indium film.
9. The end-pumped multi-path laser amplification apparatus of claim 2, wherein: the transmission rate of the bicolor mirror to the wavelength of the pumping light is more than 99 percent, the reflection rate of the bicolor mirror to the wavelength of the signal light is more than 99 percent, and the reflecting mirror group is a series of film-plating lenses which reflect the wavelength light beams of the signal source and transmit the spontaneous emission wavelength and the pumping wavelength of the crystal.
10. The end-pumped multi-path laser amplification apparatus of claim 2, wherein: the shaping lens group is a group of concave-convex lenses and is used for controlling the beam divergence angle and the light spot size of the optical signal source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322732806.7U CN221126529U (en) | 2023-10-12 | 2023-10-12 | End-pumped multichannel laser amplification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322732806.7U CN221126529U (en) | 2023-10-12 | 2023-10-12 | End-pumped multichannel laser amplification device |
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| CN221126529U true CN221126529U (en) | 2024-06-11 |
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| CN202322732806.7U Active CN221126529U (en) | 2023-10-12 | 2023-10-12 | End-pumped multichannel laser amplification device |
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