CN112247346A - Laser light path alignment device and laser light path alignment method - Google Patents
Laser light path alignment device and laser light path alignment method Download PDFInfo
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- CN112247346A CN112247346A CN202011110737.0A CN202011110737A CN112247346A CN 112247346 A CN112247346 A CN 112247346A CN 202011110737 A CN202011110737 A CN 202011110737A CN 112247346 A CN112247346 A CN 112247346A
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/073—Shaping the laser spot
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Abstract
The embodiment of the invention discloses a laser light path alignment device and a laser light path alignment method, wherein the laser light path alignment device comprises a front laser module, a power attenuation module and a rear laser module; the front laser module is used for emitting a first laser beam, and the first laser beam has first power; the power attenuation module is positioned on a propagation path of the first laser beam and used for at least adjusting the first laser beam to form a second laser beam, and the second laser beam has second power which is smaller than the first power; the rear laser module is located on a propagation path of the second laser beam and comprises a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam. The invention solves the technical problems that the influence of thermal deformation of devices such as an optical crystal, a lens and the like in a cavity of the preposed amplification stage in the optical path alignment and the damage of high-peak power density signal light to a laser gain crystal in a rear optical unit are caused by the output power of the preposed pre-amplification stage in the prior art.
Description
Technical Field
The embodiment of the invention relates to the technical field of laser, in particular to a laser light path alignment device and a laser light path alignment method.
Background
In recent years, high beam quality, high peak power near infrared, green and ultraviolet light have been the focus of research in the laser field. The solid laser based on the multi-stage amplification structure is favored by the laser processing field, particularly the fine processing field, due to the simple and compact structure, the good stability and the higher cost performance.
In the debugging of the optical path of the high-power multistage laser amplifier, the signal light output by the pre-laser pre-amplification stage needs to be accurately coupled into the post-amplification system, and the signal light needs to be strictly aligned with the optical path axis determined by a gain medium and the like in the post-amplification system so as to avoid the possibility of low efficiency and even damage to an optical crystal, so the high-power laser optical path aligning device and the method have very practical value.
At present, the commonly used high-power laser light path alignment method is to reduce the output power of the pre-amplifier stage, align the low-power signal light with the light path of the post-amplifier stage, and then increase the power of the pre-amplifier stage to achieve the final high-power alignment target. This solution, although simple in terms of adjustment, has its technical drawbacks. Because the thermal load and thermal distribution of the optical elements in the laser are different under different power operation conditions in the high-power laser amplification system, the difference between the thermal load and the thermal distribution directly influences the spot size and the beam directivity of the system output through the thermo-optic effect. If the subsequent optical path alignment is realized only by reducing the power of the pre-amplification stage, when the power of the pre-amplification stage is increased to a normal state, the thermal deformation of optical elements in the pre-amplification stage causes the thermal deformation of optical crystals, lenses and other devices of the pre-amplification stage, the size of light spots of output beams is influenced to change, and the amplification efficiency of the post-amplification stage is reduced; even if the axial shift of the signal light in the post-amplifier stage crystal is too large, it may cause optical damage to the gain crystal.
Disclosure of Invention
In view of this, embodiments of the present invention provide a laser optical path alignment apparatus and a laser optical path alignment method, so as to solve the technical problems in the prior art that the optical path alignment is affected by thermal deformation of devices such as an optical crystal and a lens in a cavity of a pre-amplifier stage due to increasing the output power of the pre-amplifier stage again, and that a laser gain crystal in a post-optical unit is damaged by high peak power density signal light.
In a first aspect, an embodiment of the present invention provides a laser light path alignment apparatus, including: the device comprises a front laser module, a power attenuation module and a rear laser module;
the front laser module is used for emitting a first laser beam, and the first laser beam has first power;
the power attenuation module is positioned on a propagation path of the first laser beam and used for at least adjusting the first laser beam to form a second laser beam, wherein the second laser beam has a second power, and the second power is smaller than the first power;
the rear laser module is located on a propagation path of the second laser beam and comprises a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam.
Optionally, the first laser beam is a linearly polarized beam;
the power attenuation module comprises a polarization adjusting unit and a polarization beam splitting unit;
the polarization adjusting unit is positioned on a propagation path of the first laser beam and is used for adjusting the deflection state of the first laser beam to form an adjusted polarization beam;
the polarization beam splitting unit is located on a propagation path of the adjusted laser beam and is configured to split the adjusted laser beam into the second laser beam and a third laser beam, where the third laser beam has a third power, and the third power is greater than the second power.
Optionally, the power attenuation module includes a polarization unit, a polarization adjustment unit, and a polarization beam splitting unit;
the polarizing unit is positioned on a propagation path of the first laser beam and is used for adjusting the first laser beam into a linearly polarized beam;
the polarization adjusting unit is positioned on the propagation path of the linearly polarized light beam and is used for adjusting the deflection state of the linearly polarized light beam to form an adjusted polarized light beam;
the polarization beam splitting unit is located on a propagation path of the adjusted and deflected light beam and is used for splitting the adjusted and polarized light beam into the second laser light beam and a third laser light beam, wherein the third laser light beam has a third power, and the third power is greater than the second power.
Optionally, the polarization beam splitting unit includes a polarization beam splitter;
the polarizing beam splitter comprises a granthomson prism or a polarizing beam splitting cube.
Optionally, the polarization beam splitting unit includes a first polarization beam splitter and a second polarization beam splitter;
the first polarization beam splitter is located on a propagation path of the adjusted polarization beam, the adjusted polarization beam enters the first polarization beam splitter at a brewster angle, the first polarization beam splitter is configured to split the adjusted polarization beam into a fourth laser beam and a third laser beam, the third laser beam has a third power, and the third power is greater than the second power;
the second polarization beam splitter is located on a propagation path of the fourth laser beam, the fourth laser beam enters the second polarization beam splitter at the brewster angle, and the second polarization beam splitter is used for adjusting the propagation direction of the fourth laser beam to form the second laser beam.
Optionally, the rear laser module further includes a first reflecting mirror and a second reflecting mirror;
the first reflector and the second reflector are sequentially located on a propagation path of the second laser beam and used for adjusting axial offset and angular direction of the second laser beam, so that the geometric center of the laser gain crystal is located in the optical axis direction of the second laser beam.
Optionally, the pre-laser module includes a fiber laser, a solid laser, an oscillator, a single-stage laser amplifier, or a multi-stage laser amplifier.
Optionally, the first power W satisfies W ≧ 10W.
In a second aspect, an embodiment of the present invention further provides a laser light path alignment method, which is applied to the laser light path alignment apparatus in the first aspect, and includes:
the front laser module emits a first laser beam, and the first laser beam has first power;
the power attenuation module is positioned on a propagation path of the first laser beam, the power attenuation module at least adjusts the first laser beam to form a second laser beam, the second laser beam has a second power, and the second power is smaller than the first power;
the rear laser module is located on a propagation path of the second laser beam and comprises a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam.
Optionally, after the geometric center of the gain crystal is located in the optical axis direction of the second laser beam, the laser light path alignment method further includes:
and moving out the power attenuation module to enable the geometric center of the gain crystal to be located in the optical axis direction of the first laser beam.
According to the laser light path alignment device provided by the embodiment of the invention, the power attenuation module is adopted in the high-power light path alignment, and the laser is subjected to power attenuation firstly, so that the light power attenuation and the light path alignment can be realized under the condition that the light beam directivity and the spot size are not changed, and the change of the light beam directivity and the spot size caused by the thermal deformation of devices such as an optical crystal, a lens and the like caused by the change of the light power of the laser beam is avoided. The technical problems that in the prior art, due to the fact that the output power of the preposed pre-amplification stage is increased again, the influence of thermal deformation of devices such as an optical crystal and a lens in a preposed amplification stage cavity in light path alignment and the damage of high-peak power density signal light to a laser gain crystal in a postposed optical unit are caused are solved, and accurate alignment and efficient transmission of light paths are achieved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic diagram of a laser alignment apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another laser alignment apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another laser alignment apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another laser alignment apparatus according to an embodiment of the present invention;
FIG. 5 is a flowchart of a laser alignment method according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating yet another method for aligning laser beams according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
Examples
An embodiment of the present invention provides a laser light path alignment apparatus, and fig. 1 is a schematic diagram of a laser light path alignment apparatus in an embodiment of the present invention. As shown in fig. 1, a laser light path aligning apparatus includes: the device comprises a front laser module 1, a power attenuation module 2 and a rear laser module 3; the front laser module 1 is used for emitting a first laser beam A, and the first laser beam A has first power; the power attenuation module 2 is positioned on a propagation path of the first laser beam A and is used for at least adjusting the first laser beam A to form a second laser beam B, and the second laser beam B has second power which is smaller than the first power; the rear laser module 3 is located on the propagation path of the second laser beam B, the rear laser module 3 includes a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam B.
Illustratively, in this embodiment, the front laser module 1 is a laser light source, and includes optical devices such as an optical crystal and a lens, the optical devices are susceptible to thermal deformation caused by temperature, the front laser module 1 emits a first laser beam a, the first laser beam a has a first power, and the first power is a larger power. Further, the polarization state of the first laser beam a may be linearly polarized light or non-linearly polarized light, which is not limited in the embodiment of the present invention.
The power attenuation module 2 is located on a propagation path of the first laser beam a, and the power attenuation module 2 has functions of attenuating the power of the first laser beam a and adjusting the polarization state of the first laser beam a, for example, adjusting the first laser beam a with the polarization state being non-linearly polarized light into a second laser beam B with the polarization state being linearly polarized light and outputting the second laser beam B. When the first laser beam a passes through the power attenuation module 2, the power attenuation module 2 forms a second laser beam B to be output by adjusting the first laser beam a, so as to obtain a second power of the second laser beam B which is smaller than the first power of the first laser beam a, and the second laser beam B is used for adjusting and aligning the rear laser module 3.
The rear laser module 3 comprises a laser gain crystal, the geometric center of the laser gain crystal is located in the optical axis direction of the second laser beam B, the laser gain crystal is an important working substance of the rear laser module 3, the geometric center of the laser gain crystal is adjusted to be located in the optical axis direction of the second laser beam B, and optical damage to the gain crystal caused by axial deviation of the second laser beam B passing through the rear laser module 3 can be effectively avoided.
Therefore, the whole laser light path is aligned through the second laser beam B with smaller power, and the rear laser module 3 cannot be damaged. After laser alignment is completed, the power attenuation module 2 can be withdrawn, and because the laser alignment process is completed, the geometric center of the gain crystal is simultaneously located in the optical axis direction of the first laser beam A, and at the moment, the high-power first laser beam A cannot damage the gain crystal. And, different from the scheme of the prior art that the optical power of the front laser module 1 is reduced first to perform alignment adjustment and then the optical power is increased again, which causes the thermal deformation of the optical element in the front laser module 1, the technical scheme provided by the embodiment of the invention does not need to adjust the optical power of the front laser module 1, does not have the problem of the thermal deformation of the optical element in the front laser module 1, and does not have the problem of the optical path alignment accuracy affected by the thermal deformation problem of the optical element in the front laser module 1. Therefore, the problem that in the prior art, the amplification efficiency of the rear laser module 3 is reduced due to the change of the directivity and the size of a light spot of the first laser beam A caused by the thermal deformation of an optical element in the front laser module 1 and the like caused by the fact that the optical power of the front laser module 1 is reduced to perform collimation adjustment and then the optical power is increased again can be solved.
Fig. 2 is a schematic diagram of another laser light path alignment apparatus according to another embodiment of the present invention. As shown in fig. 2, the first laser beam a is a linearly polarized beam; the power attenuation module 2 comprises a polarization adjusting unit 21 and a polarization beam splitting unit 22; the polarization adjusting unit 21 is located on a propagation path of the first laser beam a, and is configured to adjust a deflection state of the first laser beam to form an adjusted polarized beam a'; the polarization beam splitting unit 22 is located on a propagation path of the adjustment laser beam a' and is configured to split the adjustment laser beam into a second laser beam B and a third laser beam C, where the third laser beam C has a third power, and the third power is greater than the second power.
Illustratively, the front laser module 1 may be a multi-stage laser amplifier, the multi-stage laser amplifier emits a first laser beam, the first laser beam a is a linearly polarized laser beam, the polarization adjusting unit 21 and the polarization beam splitting unit 22 are disposed on a propagation path of the first laser beam a, the polarization adjusting unit 21 has a function of changing a polarization state of the linearly polarized laser beam, and the polarization beam splitting unit 22 has a function of selecting a polarization state, where the polarization state includes a polarization state vibrating along a beam propagation direction and a polarization state vibrating perpendicular to the beam propagation direction. The polarization adjusting unit 21 may be a half-wave plate, and the polarization direction of the polarized light beam is rotated by rotating the angle θ of the half-wave plate, so as to adjust the polarization state of the first laser beam a, and form an adjusted polarized light beam required to be aligned with the rear laser module 3. The polarization beam splitting unit 22 selects and adjusts the polarization state of the polarization beam, and splits the adjusted polarization beam into a second laser beam B and a third laser beam C, meanwhile, the optical power of the third laser beam C is greater than that of the second laser beam B, an included angle theta ' exists between the propagation direction of the third laser beam C and the propagation direction of the second laser beam B, the included angle theta ' is larger than 0 degree and smaller than 180 degrees, the value theta ' can be changed by rotating the angle theta of the half-wave plate, and the purpose of power attenuation is achieved by the way of adjusting and splitting the first laser beam a through the cooperation of the polarization adjusting unit 21 and the polarization beam splitting unit 22 in the embodiment.
Fig. 3 is a schematic diagram of another laser light path alignment apparatus in an embodiment of the present invention. Referring to fig. 3, the power attenuation module 2 includes a polarizing unit 23, a polarization adjusting unit 21, and a polarization beam splitting unit 22; the polarizing unit 23 is located on a propagation path of the first laser beam a, and is configured to adjust the first laser beam a to be a linearly polarized beam a "; the polarization adjusting unit 22 is located on the propagation path of the linearly polarized light beam a ″ and is used for adjusting the deflection state of the linearly polarized light beam a ″ to form an adjusted polarized light beam a'; the polarization beam splitting unit is located on a propagation path of the adjusted and deflected light beam A 'and is used for splitting the adjusted and polarized light beam A' into a second laser beam B and a third laser beam C, and the third laser beam C has a third power which is greater than the second power.
Illustratively, the front laser module 1 may be a multi-stage laser amplifier, the multi-stage laser amplifier emits a first laser beam a, the first laser beam a is a non-linearly polarized beam, the power attenuation module 2 includes a polarization unit 23, a polarization adjusting unit 21 and a polarization beam splitting unit 22, the polarization unit 23 is disposed on a propagation path of the first laser beam a, the polarization unit 23 may be a polarizer and has a function of adjusting the non-linearly polarized beam to output a linearly polarized beam a ″, and the polarization adjusting unit 21 and the polarization beam splitting unit 22 achieve the purpose of attenuating the attenuation power by splitting the adjusted polarization beam as described in detail in the foregoing embodiments, and will not be described in detail herein.
Based on the above embodiment, the polarization beam splitting unit 22 is an important unit for realizing beam splitting and attenuation of the laser beam, and the polarization beam splitting unit 22 can be realized by combining various components.
Optionally, with continued reference to fig. 3, the polarizing beam splitting unit 22 comprises a polarizing beam splitter; the polarizing beam splitter comprises a granthomson prism or a polarizing beam splitting cube. The Lanthomson prism or the polarization beam splitting cube can be used as a polarization beam splitter to split an adjusted polarization beam into two or more beams, the light power of each beam after exemplary splitting can be the same or different, the polarization beam splitting cube has the function of selecting the polarization state, the angle of a half-wave plate in the polarization unit is reasonably rotated, and the beam splitting output light path of the polarization beam splitting unit 22 is realized.
Optionally, fig. 4 is a schematic diagram of another laser light path alignment apparatus in an embodiment of the present invention, where the polarization beam splitting unit 22 includes a first polarization beam splitter 221 and a second polarization beam splitter 222; the first polarization beam splitter 221 is located on the propagation path of the polarization-adjusted beam, the polarization-adjusted beam enters the first polarization beam splitter 221 at the brewster angle, the first polarization beam splitter 22 is configured to split the polarization-adjusted beam into a fourth laser beam D and a third laser beam C, the third laser beam C has a third power, and the third power is greater than the second power; the second PBS 222 is located on the propagation path of the fourth laser beam D, and the fourth laser beam D is incident to the second PBS 222 at the Brewster angle, and the second PBS is used for adjusting the propagation direction of the fourth laser beam D to form the second laser beam B.
Illustratively, the polarization beam splitting unit 22 includes a first polarization beam splitter 221 and a second polarization beam splitter 222, and the first polarization beam splitter 221 and the second polarization beam splitter 222 may be thin film polarizers, which have a high damage threshold and can withstand the high power density of the laser beam. The first polarization beam splitter 221 is arranged on the optical axis of the propagation path of the adjusted polarization beam a ', the first polarization beam splitter 221 has a function of splitting laser beams, the first polarization beam splitter 221 splits the adjusted polarization beam a' into a fourth laser beam D and a third laser beam C, third power of the third laser beam C obtained through beam splitting is greater than fourth power of the fourth laser beam D, and the third laser beam is deflected and output through the adjusted polarization adjusting unit 21; the second polarization beam splitter 223 is disposed on the optical axis of the propagation path of the fourth laser beam D, the fourth laser beam D is adjusted to enter the second polarization beam splitter 222 at the brewster angle, so as to form the second laser beam B for output, the second polarization beam splitter 223 plays a role in adjusting the propagation direction of the fourth laser beam D, the propagation direction of the fourth laser beam D can be made to propagate along the optical axis of the propagation path of the adjusted polarized beam a' by incidence at the brewster angle, and then the fourth laser beam D is made to enter the second polarization beam splitter 222 at the brewster angle, so that the optical axis of the propagation path of the fourth laser beam D is the same as the optical axis of the propagation path of the second laser beam B described in the above embodiment, and finally the output is realized to be overlapped with the optical axis of the propagation path of the first laser beam a emitted by the front laser module 1, the damage of the laser gain crystal in the rear laser device 3 caused by the deviation of the laser beam propagation direction can be effectively avoided; the second power is the laser beam for adjusting the collimation of the rear laser module 3 described in the above embodiments.
Optionally, with continued reference to fig. 4, the back laser module 3 further comprises a first mirror 31 and a second mirror 32; the first mirror 31 and the second mirror 32 are sequentially located on the propagation path of the second laser beam B for adjusting the axial offset and angular orientation of the second laser beam B so that the geometric center of the gain crystal is located in the optical axis direction of the second laser beam.
Illustratively, based on the above embodiment, in order to further precisely align the second laser beam B, the front end of the laser gain crystal 31 in the rear laser module 3 is provided with the first reflector 31 and the second reflector 32, the surfaces of the first reflector 31 and the second reflector 32 are plated with highly reflective films, so that the axial offset and the angular orientation of the second laser beam B can be adjusted, the optical axis of the second laser beam B passes through the geometric center of the gain crystal, the direct alignment of the optical axes of the front laser module 1 and the rear laser module 3 is realized, the damage of the gain crystal caused by the laser beam offset is further avoided, and the transmission efficiency of the laser beam is improved.
Optionally, the pre-laser module 1 includes a fiber laser, a solid laser, an oscillator, a single-stage laser amplifier, or a multi-stage laser amplifier. Optionally, the first power W satisfies W ≧ 10W. The application range of the front laser module 1 in this embodiment is wide, and the front laser module may be a fiber laser, a solid laser, an oscillator, a single-stage or multi-stage amplifier, but is not limited thereto, and any system capable of outputting high-power signal light with power greater than or equal to 10w may be used.
It should be noted that, in the present invention, the front laser module 1 serves as a laser light emitting source, the emitted first laser beam may be a linearly polarized beam or a non-linearly polarized beam, and the polarization states of the laser beams are different from each other, and the polarization states of the two laser beams are described below, where the described embodiment is a part of, but not all, embodiments of the present invention, and the arrangement of the components of the power attenuation module 2 is not limited to this.
In conclusion, the invention has the advantages of simple and compact structure, strong expandability and flexible operation, and can effectively reduce the influence of thermal deformation of devices such as optical crystals, lenses and the like in the front laser module in the optical path alignment and the problems of low transmission efficiency and gain crystal damage caused by axial deviation of laser beams.
Based on the foregoing embodiment, fig. 5 is a flowchart of a laser light path alignment method according to an embodiment of the present invention, and referring to fig. 5, an embodiment of the present invention further provides a laser light path alignment method applied to the laser light path alignment apparatus according to the foregoing embodiment, including:
s01, emitting a first laser beam by the front laser module; the first laser beam has a first power.
And S02, the power attenuation module is located on a propagation path of the first laser beam, the power attenuation module at least adjusts the first laser beam to form a second laser beam, and the second laser beam has a second power which is smaller than the first power.
And S03, the rear laser module is positioned on the propagation path of the second laser beam, the rear laser module comprises a laser gain crystal, and the geometric center of the gain crystal is positioned on the optical axis direction of the second laser beam.
In an exemplary laser optical path alignment method according to an embodiment of the present invention, a power attenuation module is used to split and attenuate a first laser beam emitted from a front laser module to obtain a second laser beam with a small power, optical path alignment is performed without damaging a laser gain crystal, a rear laser module is disposed on a propagation path of the second laser beam, such that a geometric center of the gain crystal is located in an optical axis direction of the second laser beam, and then all optical devices in a power attenuation unit are removed from an alignment optical path, thereby achieving direct alignment of optical path axes of the front laser module and the rear laser module. The method is different from the scheme that the optical power of the front laser module is reduced firstly to carry out alignment adjustment and then the optical power is improved again to cause thermal deformation of an optical element in the front laser module in the prior art, realizes optical power attenuation and optical path alignment under the condition of not changing the light beam directivity and the light spot size, avoids the problems of gain crystal damage and the like caused by thermal deformation of optical crystals, lenses and other devices caused by changing the optical power of the laser beam, and further realizes the accurate alignment of the laser optical path and the efficient transmission of the optical power. The laser alignment method is applied to the laser light path alignment device in the above embodiment, and reference may be made to the detailed description in the above embodiment, thereby achieving precise alignment of the laser light path and efficient transmission of optical power.
Optionally, fig. 6 is a flowchart of a laser light path alignment method according to an embodiment of the present invention, and referring to fig. 6, the laser light path alignment method according to the embodiment of the present invention includes:
s11, emitting a first laser beam by the front laser module; the first laser beam has a first power.
And S12, the power attenuation module is located on a propagation path of the first laser beam, the power attenuation module at least adjusts the first laser beam to form a second laser beam, and the second laser beam has a second power which is smaller than the first power.
And S13, the rear laser module is positioned on the propagation path of the second laser beam, the rear laser module comprises a laser gain crystal, and the geometric center of the gain crystal is positioned on the optical axis direction of the second laser beam.
And S14, moving the power attenuation module out, so that the geometric center of the gain crystal is positioned in the optical axis direction of the first laser beam.
Illustratively, based on the above embodiment, after the geometric center of the gain crystal is located in the optical axis direction of the second laser beam, the power attenuation module is moved out, so as to achieve direct alignment of the optical path axes of the front laser module and the rear laser module, and the method is suitable for the debugging of the optical path of the high-power multi-stage laser amplifier, and needs a debugging process of accurately coupling the signal light output by the front laser pre-amplification stage to the rear amplification system.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may be capable of cooperating with each other in various ways and of being technically driven. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A laser light path alignment device, comprising: the device comprises a front laser module, a power attenuation module and a rear laser module;
the front laser module is used for emitting a first laser beam, and the first laser beam has first power;
the power attenuation module is positioned on a propagation path of the first laser beam and used for at least adjusting the first laser beam to form a second laser beam, wherein the second laser beam has a second power, and the second power is smaller than the first power;
the rear laser module is located on a propagation path of the second laser beam and comprises a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam.
2. The laser light path alignment device of claim 1, wherein the first laser beam is a linearly polarized beam;
the power attenuation module comprises a polarization adjusting unit and a polarization beam splitting unit;
the polarization adjusting unit is positioned on a propagation path of the first laser beam and is used for adjusting the deflection state of the first laser beam to form an adjusted polarization beam;
the polarization beam splitting unit is located on a propagation path of the adjusted laser beam and is configured to split the adjusted laser beam into the second laser beam and a third laser beam, where the third laser beam has a third power, and the third power is greater than the second power.
3. The laser light path alignment device according to claim 1, wherein the power attenuation module includes a polarizing unit, a polarization adjusting unit, and a polarization beam splitting unit;
the polarizing unit is positioned on a propagation path of the first laser beam and is used for adjusting the first laser beam into a linearly polarized beam;
the polarization adjusting unit is positioned on the propagation path of the linearly polarized light beam and is used for adjusting the deflection state of the linearly polarized light beam to form an adjusted polarized light beam;
the polarization beam splitting unit is located on a propagation path of the adjusted and deflected light beam and is used for splitting the adjusted and polarized light beam into the second laser light beam and a third laser light beam, wherein the third laser light beam has a third power, and the third power is greater than the second power.
4. The laser light path alignment device according to claim 2 or 3, wherein the polarization beam splitting unit includes a polarization beam splitter;
the polarizing beam splitter comprises a granthomson prism or a polarizing beam splitting cube.
5. The laser light path alignment device according to claim 2 or 3, wherein the polarization beam splitting unit includes a first polarization beam splitter and a second polarization beam splitter;
the first polarization beam splitter is located on a propagation path of the adjusted polarization beam, the adjusted polarization beam enters the first polarization beam splitter at a brewster angle, the first polarization beam splitter is configured to split the adjusted polarization beam into a fourth laser beam and a third laser beam, the third laser beam has a third power, and the third power is greater than the second power;
the second polarization beam splitter is located on a propagation path of the fourth laser beam, the fourth laser beam enters the second polarization beam splitter at the brewster angle, and the second polarization beam splitter is used for adjusting the propagation direction of the fourth laser beam to form the second laser beam.
6. The laser light path alignment device of claim 1, wherein the rear laser module further comprises a first mirror and a second mirror;
the first reflector and the second reflector are sequentially located on a propagation path of the second laser beam and used for adjusting axial offset and angular pointing of the second laser beam, so that the geometric center of the laser gain crystal is located in the optical axis direction of the second laser beam.
7. The laser light path alignment device of claim 1, wherein the pre-laser module comprises a fiber laser, a solid state laser, an oscillator, a single stage laser amplifier, or a multi-stage laser amplifier.
8. The laser beam path alignment device of claim 1, wherein the first power W is W ≧ 10W.
9. A laser light path aligning method applied to the laser light path aligning apparatus according to any one of claims 1 to 8, comprising:
the front laser module emits a first laser beam, and the first laser beam has first power;
the power attenuation module is positioned on a propagation path of the first laser beam, the power attenuation module at least adjusts the first laser beam to form a second laser beam, the second laser beam has a second power, and the second power is smaller than the first power;
the rear laser module is located on a propagation path of the second laser beam and comprises a laser gain crystal, and the geometric center of the gain crystal is located in the optical axis direction of the second laser beam.
10. The laser optical alignment method of claim 9, wherein the geometric center of the gain crystal is located behind the optical axis direction of the second laser beam, the laser optical alignment method further comprising:
and moving out the power attenuation module to enable the geometric center of the gain crystal to be located in the optical axis direction of the first laser beam.
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