AU2021102358A4 - Method for efficient coupling output of high-peak-power laser for cleaning - Google Patents
Method for efficient coupling output of high-peak-power laser for cleaning Download PDFInfo
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- AU2021102358A4 AU2021102358A4 AU2021102358A AU2021102358A AU2021102358A4 AU 2021102358 A4 AU2021102358 A4 AU 2021102358A4 AU 2021102358 A AU2021102358 A AU 2021102358A AU 2021102358 A AU2021102358 A AU 2021102358A AU 2021102358 A4 AU2021102358 A4 AU 2021102358A4
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- laser
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- output
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- 238000010168 coupling process Methods 0.000 title claims abstract description 36
- 230000008878 coupling Effects 0.000 title claims abstract description 34
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 34
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Classifications
-
- 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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
Abstract
OF THE DISCLOSURE
The present disclosure provides a method for efficient coupling output of a high-peak-power
laser for cleaning. To achieve this objective, a laser device of the present disclosure adopts a master
oscillator power amplifier (MOPA) structure (that is, a laser generated by an oscillator is amplified
by an amplifier and then output), and the oscillator of the laser device adopts a dynamic asymmetric
stable cavity, which can ensure a better laser output mode and higher power. In addition, lenses
have low misalignment sensitivity, so that a spot fills an effective area of a crystal rod in the
amplifier, which increases extraction efficiency of the amplifier, and also avoids damaging an LD
due to an excessively large spot.
9
Description
[01] The present disclosure relates to the technical field of laser cleaning, and specifically, to a method for efficient coupling output of a high-peak-power laser for cleaning.
[02] Laser cleaning is an emerging green cleaning method, which has attracted a growing attention since this year. Compared with traditional cleaning methods, laser cleaning has the advantages of high precision, energy saving and environmental protection. Peak power is a key factor affecting the laser cleaning effect. At present, two kinds of cleaning laser devices are available on the market: a fiber laser device and a solid-state laser device. A solid-state laser device can break through high peak power at high average power, and has prominent advantages over a fiber laser device in cleaning. However, the solid-state laser device has a beam quality inferior to the fiber laser device. As a result, lasers cannot be coupled into an energy transmission fiber for output, and a laser coupler is prone to be damaged under high peak power. In addition, the solid-state laser device cannot resolve the problem of low coupling efficiency.
[03] The patent "SOLID-STATE LASER WITH HIGH AVERAGE POWER AND HIGH REPETITION RATE" (200910082481.4) proposes a solid-state laser device that uses different gain media for the oscillation stage and the amplifier stage to obtain laser pulse output with high average power and high repetition rate, which effectively solves the problem that a solid-state laser device using a single gain medium cannot obtain high average power and high repetition laser output. However, the oscillation stage uses a single module and a single Q-switch, which cannot ensure quality of pulsed laser beams. In addition, this patent does not cover a method for coupling lasers at high average power and high repetition rate into an energy transmission fiber, and therefore is not applicable to the cleaning field.
[04] In view of the defects in the prior art, the present disclosure provides a method for efficient coupling output of a high-peak-power laser for cleaning.
[05] The present disclosure aims to obtain pulse lasers with high peak power and high beam quality, and couple the lasers into an optical fiber for transmission and output, to achieve high-efficiency laser cleaning.
[06] To achieve this objective, a laser device of the present disclosure adopts a master oscillator power amplifier (MOPA) structure (that is, a laser generated by an oscillator is amplified by an amplifier and then output), and the oscillator of the laser device adopts a dynamic asymmetric stable cavity, which can ensure a better laser output mode and higher power. In addition, lenses have low misalignment sensitivity, so that a spot fills an effective area of a crystal rod in the amplifier, which increases extraction efficiency of the amplifier, and also avoids damaging an LD due to an excessively large spot.
[07] The orthogonal placement design of acousto-optic switches ensures effective shutdown of continuous laser output, and reduces heat accumulation on a fiber section. The laser collimation and coupling method is designed to couple high-peak-power lasers into an optical fiber for output, improving the laser coupling efficiency.
[08] The technical solutions of the present disclosure are described in combination with the accompanying drawings.
[09] 1. An oscillator module 3 has target plates designed as five directions and three wires, has a power of 15 W x 30 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of <p4*78mm. Such design can ensure uniform energy density for a largest possible spot, and prevent high energy density from damaging optical devices in pulse mode.
[10] 2. A dynamic asymmetric stable cavity is used, and a distance between an output mirror 7 and the oscillator module 3 is twice a distance between a total-reflection mirror 1 and the oscillator module 3. Such design can maximize output power while maintaining high beam quality.
[11] 3. Double Q-switches are symmetrically placed on both sides of the oscillator module 3 in an orthogonal manner. The orthogonal placement can ensure effective shutdown of high-power lasers at a high repetition rate. A distance between the double Q-switches and the oscillator module 3 is 1 cm to 2 cm. This avoids the following problems when the oscillator module 3 has a large current: if the distance is too large, a Q-switch optical crystal is damaged due to thermal lens effect of a laser medium; if the distance is too small, the scattered light of the Q-switches affects the crystal in the oscillator module 3.
[12] 4. The MOPA structure design is used to prevent the high power of an oscillator from damaging optical devices. An amplifier module 8 is designed as five directions and three wires, has a power is 15 W x 40 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of <p5*78mm. Such design ensures that all lasers output from the oscillator act on the crystal of the amplifier module 8 without damaging target plates in the amplifier module 8.
[13] 5. The laser device is designed to a three-layer structure, and two 45 adjustable total-reflection mirrors are placed in front of the amplifier module 8 and a laser coupling system 13, respectively. Such design achieves an appropriate length-width ratio, and more importantly, supports tuning of a laser transmission direction so that lasers are accurately coupled into the amplifier module 8 and an optical fiber 14.
[14] 6. Small holes 11 and 12 are provided in front of a laser coupling system 13, where the small hole 11 is close to a 450 adjustable total-reflection mirror 10, and the small hole 12 is close to the laser coupling system. A 45° adjustable total-reflection mirror 9 is adjusted to make lasers completely pass through the small hole 11. The 45° adjustable total-reflection mirror 10 is adjusted to make the lasers completely pass through the small hole 12. The foregoing steps are repeated to make the lasers completely pass through the small holes 11 and 12, ensuring that the lasers completely enter the laser coupling system 13.
[15] 7. The laser coupling system first amplifies, then collimates, and then focuses the lasers, so as to obtain a smaller laser spot and couple the lasers into the optical fiber 14 of 200 microns to 300 microns. The laser acts on a beam expander lens 16, to realize divergence of beam. The laser is collimated by a collimating lens 17, then the spot is reduced by a focusing lens 18 with a shorter focal length, and then the laser is coupled into the optical fiber 14. The left and right positions of the collimating lens 17 are adjustable to control the size of a focus spot.
[16] Advantages of this patent
[17] The laser device adopts an MOPA structure shown in FIG. 1. The oscillator adopts a dynamic stable cavity, which ensures a better laser output mode, higher power, and lower misalignment sensitivity of lenses, thereby increasing a probability of completely coupling lasers into the optical fiber.
[18] Through the orthogonal placement of double Q-switches, dual-hole collimation, and telescope-like coupling method, the difficulty and inefficiency in coupling lasers into an optical fiber under high peak power are addressed.
[19] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, accompanying drawings to be used in the description of the specific embodiments or the prior art will be briefly described below. In all the accompanying drawings, similar elements or portions are generally identified by similar reference numerals of the accompanying drawings. In the accompanying drawings, each element or portion is not necessarily drawn to the actual scale.
[20] FIG. 1 is a flowchart of a method for efficient coupling and output of a high-peak-power laser for cleaning according to an embodiment of the present disclosure.
[21] FIG. 2 is a principle diagram of the laser coupling system shown in FIG. 1.
[22] In the figure, 1. total-reflection mirror, 2. Q-switch 1, 3. oscillator module, 4. Q-switch 2, 5. 450 total-reflection mirror 1, 6. 45° total-reflection mirror 2, 7. output mirror, 8. amplifier module, 9. 450 total-reflection mirror 3, 10. 45° total-reflection mirror 4, 11. small hole 1, 12. small hole 2, 13. coupling system, and 14. energy transmission fiber.
[23] To make the foregoing objectives, features, and advantages of the present disclosure clearer and more comprehensible, the specific implementations of the present disclosure are described in detail below with reference to the accompanying drawings. The following describes many details in order to provide a thorough understanding of the present application, but the present disclosure can be implemented in many other ways other than those described herein, and those skilled in the art can make similar expansion without departing from the connotation of the present disclosure, and thus the present disclosure is not limited to the specific embodiments disclosed below.
[24] It should be noted that when a component "fixedto" another component, the component may be directly on the another component or there may be an intermediate component. When a component is "connected" to another component, the component may be directly connected to the another component or there may be an intermediate component.
[25] For ease of description, spatial terms such as "upper", "lower", "left" and "right" may be used herein to describe the relationship of one element or feature shown in the figure with respect to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the apparatus in use or operation. For example, if the apparatus in the figure is turned upside down, elements described as being "under" other elements or features will be located "above" the other elements or features. Therefore, the exemplary term "lower" can encompass both upper and lower directions.
[26] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms used herein are merely for the purpose of describing specific embodiments, and is not intended to limit the present disclosure. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.
[27] The technical solutions of the present disclosure are described in combination with the accompanying drawings.
[28] 1. An oscillator module 3 has target plates designed as five directions and three wires, has a power of 15 W x 30 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of <p4*78mm. Such design can ensure uniform energy density for a largest possible spot, and prevent high energy density from damaging optical devices in pulse mode.
[29] 2. A dynamic asymmetric stable cavity is used, and a distance between an output mirror 7 and the oscillator module 3 is twice a distance between a total-reflection mirror 1 and the oscillator module 3. Such design can maximize the output power while maintaining high beam quality.
[30] 3. Double Q-switches are symmetrically placed on both sides of the oscillator module 3 in an orthogonal manner. The orthogonal placement can ensure effective shutdown of high-power lasers at a high repetition rate. A distance between the double Q-switches and the oscillator module 3 is 1 cm to 2 cm. This avoids the following problems when the oscillator module 3 has a large current: if the distance is too large, a Q-switch optical crystal is damaged due to thermal lens effect of a laser medium; if the distance is too small, the scattered light of the Q-switches affects the crystal in the oscillator module 3.
[31] 4. An MOPA structure design is used to prevent the high power of an oscillator from damaging optical devices. An amplifier module 8 is designed as five directions and three wires, has a power of 15 W x 40 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of <p5*78mm. Such design ensures that all lasers output from the oscillator act on the crystal of the amplifier module 8 without damaging target plates in the amplifier module 8.
[32] 5. A laser device is designed to a three-layer structure, and two 450 adjustable total-reflection mirrors are placed in front of the amplifier module 8 and a laser coupling system 13, respectively. Such design achieves an appropriate length-width ratio, and more importantly, supports tuning of a laser transmission direction so that lasers are accurately coupled into the amplifier module 8 and an optical fiber 14.
[33] 6. Small holes 11 and 12 are provided in front of a laser coupling system 13, where the small hole 11 is close to a 45° adjustable total-reflection mirror 10, and the small hole 12 is close to the laser coupling system. A 45° adjustable total-reflection mirror 9 is adjusted to make lasers completely pass through the small hole 11. The 45° adjustable total-reflection mirror 10 is adjusted to make the lasers completely pass through the small hole 12. The foregoing steps are repeated to make the lasers completely pass through the small holes 11 and 12, ensuring that the lasers can completely enter the laser coupling system 13.
[34] 7. The laser coupling system first amplifies, then collimates, and then focuses the lasers, so as to obtain a smaller laser spot and couple the lasers into the optical fiber 14 of 200 microns to 300 microns. The laser acts on a beam expander lens 16, to realize divergence of beam. The laser is collimated by a collimating lens 17, then the spot is reduced by a focusing lens 18 with a shorter focal length, and then the laser is coupled into the optical fiber 14. The left and right positions of the collimating lens 17 are adjustable to control the size of a focus spot.
[35] In FIG. 1, a beam generated by the amplifier module 3 oscillates back and forth in a resonant cavity composed of the total-reflection mirror 1 and an output mirror 5, and continuous lasers are output through the output mirror 5. Double Q-switches 2 and 4 are placed orthogonally, to turn the continuous lasers into pure pulse lasers. The lasers are fine-tuned into the amplifier module 8 through two 450 adjustable all-reflection mirrors 6 and 7 to amplify the output laser power, and then completely fine-tuned through the two 450 adjustable total-reflection mirrors 9 and 10 to pass through the small holes 11 and 12. Then the lasers are coupled into the optical fiber 14 through the laser coupling system 13.
[36] In FIG. 2, the laser acts on the beam expander lens 16, to realize divergence of beam. Lasers are collimated by the collimating lens 17, then a light spot is reduced by the focusing lens 18 with a shorter focal length, and then the lasers are coupled into the optical fiber 14. The left and right positions of the collimating lens 17 are adjustable to control the size of a focus spot.
[37] Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of the present disclosure, but not for limiting the present disclosure. Although the present disclosure is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some or all technical features thereof; and these modifications or replacements do not make the essence of the corresponding technical solution depart from the scope of the technical solutions of the embodiments of the present disclosure, and shall fall within the scope of claims and specification of the present disclosure.
Claims (5)
1. A method for efficient coupling output of a high-peak-power laser for cleaning, comprising: configuring an oscillator module 3, wherein the oscillator module 3 has target plates designed as five directions and three wires, has a power of 15 W x 30 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of p4*78mm; such design ensures uniform energy density for a largest possible spot, and prevents high energy density from damaging optical devices in pulse mode.
2. The method for efficient coupling output of a high-peak-power laser for cleaning according to claim 1, comprising: using a dynamic asymmetric stable cavity, and setting a distance between an output mirror 7 and the oscillator module 3 to be twice a distance between a total-reflection mirror 1 and the oscillator module 3, so as to maximize output power while maintaining high beam quality.
3. The method for efficient coupling output of a high-peak-power laser for cleaning according to claim 1, comprising: symmetrically placing double Q-switches on both sides of the oscillator module 3 in an orthogonal manner, wherein the orthogonal placement ensures effective shutdown of high-power lasers at a high repetition rate; and a distance between the double Q-switches and the oscillator module 3 is 1 cm to 2 cm, avoiding the following problems when the oscillator module 3 has a large current: if the distance is too large, a Q-switch optical crystal is damaged due to thermal lens effect of a laser medium; if the distance is too small, the scattered light of the Q-switches affects a crystal in the oscillator module 3.
4. The method for efficient coupling output of a high-peak-power laser for cleaning according to claim 1, comprising: using a master oscillator power amplifier (MOPA) structure design to prevent the high power of an oscillator from damaging optical devices, wherein an amplifier module 8 is designed as five directions and three wires, has a power of 15 W x 40 W, and uses an Nd:YAG crystal as a laser medium, with a doping concentration of greater than 0.6% and a size of (p5*78mm; such design ensures that all lasers output from the oscillator act on the crystal of the amplifier module 8 without damaging target plates in the amplifier module 8.
5. The method for efficient coupling output of a high-peak-power laser for cleaning according to claim 1, comprising: designing a laser device to a three-layer structure, and placing two 45 adjustable total-reflection mirrors in front of an amplifier module 8 and a laser coupling system 13, respectively; such design achieves an appropriate length-width ratio, and more importantly, supports tuning of a laser transmission direction so that lasers are accurately coupled into the amplifier module 8 and an optical fiber 14; comprising: configuring small holes 11 and 12 in front of a laser coupling system 13, wherein the small hole 11 is close to a 45 adjustable total-reflection mirror 10, and the small hole 12 is close to the laser coupling system; adjusting a 45 adjustable total-reflection mirror 9 to make lasers completely pass through the small hole 11; adjusting the 45 adjustable total-reflection mirror 10 to make the lasers completely pass through the small hole 12; and repeating the foregoing steps to make the lasers completely pass through the small holes 11 and 12, ensuring that the lasers completely enter the laser coupling system 13; comprising: controlling the laser coupling system to first amplify, then collimate, and focus lasers, so as to obtain a smaller laser spot and couple the lasers into an optical fiber 14 of 200 microns to 300 microns, wherein the laser acts on a beam expander lens 16, to realize divergence of beam; and the laser is collimated by a collimating lens 17, the spot is reduced by a focusing lens 18 with a shorter focal length, and the laser is coupled into the optical fiber 14, wherein the left and right positions of the collimating lens 17 are adjustable to control the size of a focus spot.
－1/2－
FIG. 1
－2/2－
FIG. 2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102358A AU2021102358A4 (en) | 2021-05-05 | 2021-05-05 | Method for efficient coupling output of high-peak-power laser for cleaning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102358A AU2021102358A4 (en) | 2021-05-05 | 2021-05-05 | Method for efficient coupling output of high-peak-power laser for cleaning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021102358A4 true AU2021102358A4 (en) | 2021-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021102358A Ceased AU2021102358A4 (en) | 2021-05-05 | 2021-05-05 | Method for efficient coupling output of high-peak-power laser for cleaning |
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| AU (1) | AU2021102358A4 (en) |
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2021
- 2021-05-05 AU AU2021102358A patent/AU2021102358A4/en not_active Ceased
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| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |