CN110456521B - Light path system for aligning, installing and adjusting unstable cavity solid laser - Google Patents
Light path system for aligning, installing and adjusting unstable cavity solid laser Download PDFInfo
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- CN110456521B CN110456521B CN201910710285.0A CN201910710285A CN110456521B CN 110456521 B CN110456521 B CN 110456521B CN 201910710285 A CN201910710285 A CN 201910710285A CN 110456521 B CN110456521 B CN 110456521B
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Abstract
The invention relates to the technical field of laser, and discloses an optical path system for aligning and adjusting an unstable cavity solid laser. The structure comprises the following structures: an aperture diaphragm is arranged between the laser and the semi-reflecting and semi-transmitting mirror, the aperture diaphragm is arranged on a first guide rail, and a first relay reflector and a second relay reflector are sequentially arranged on light paths at two sides of the semi-reflecting and semi-transmitting mirror; the first relay reflector and the second relay reflector are adjustable in position, a reflection light path of the first relay reflector is provided with a telescopic system objective lens, a telescopic system ocular lens, an autocollimator and an imaging camera, and the telescopic system objective lens and the telescopic system ocular lens are arranged on a second guide rail; and a third relay reflector, a fourth relay reflector and a laser gain medium are sequentially arranged on a reflection light path of the second relay reflector, and a laser unstable resonator front mirror and a laser unstable resonator rear mirror are respectively arranged on two sides of the laser gain medium. The position adjustment of the cavity mirror of the unstable resonator and the gain medium of the solid laser is realized through the structure.
Description
Technical Field
The invention relates to the technical field of laser, in particular to an optical path system for aligning and adjusting an unstable cavity solid laser.
Background
A solid state laser is a diode pumped all solid state laser. Along with the development of social technology, more and more high-power solid lasers are used in the fields of industry, aerospace and the like, and particularly, the power of a continuous fiber laser reaches the ten-thousand watt level, so that the continuous fiber laser is mature and applied to welding, cutting and cladding; however, the all-solid-state (except fiber laser) solid-state laser of the pulse laser cannot be replaced, and the advantages of high repetition frequency, high energy, low thermal control, good beam quality and the like are not the second choice in the industry, and particularly for some special purposes, such as laser long-distance ranging, the performance advantage of the pulse laser is very prominent. Long-distance transmission requires good beam quality, while an unstable cavity solid-state laser is a method for achieving good beam quality, but the unstable cavity solid-state laser has very high detuning sensitivity, which requires very high laser adjusting precision to ensure the output stability of the laser.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing problems, in order to well ensure the cavity assembly of the unstable cavity and the optical path alignment of the gain medium structure, an optical path system for the alignment and the assembly of the unstable cavity solid laser is provided.
The technical scheme adopted by the invention is as follows: an optical path system for aligning, installing and adjusting an unstable resonator solid laser comprises a laser, a semi-reflecting and semi-transmitting mirror, a small hole light fence, a first relay reflector, a second relay reflector, a telescopic system objective lens, a telescopic system eyepiece, an autocollimator, an imaging camera, a third relay reflector, a fourth relay reflector, a laser gain medium, a laser unstable resonator front mirror and a laser unstable resonator rear mirror, wherein the small hole light fence is arranged between the laser and the semi-reflecting and semi-transmitting mirror and is arranged on a first guide rail, and a first relay reflector and a second relay reflector are sequentially arranged on optical paths at two sides of the semi-reflecting and semi-transmitting mirror; the first relay reflector and the second relay reflector are adjustable in position, a reflection light path of the first relay reflector is sequentially provided with a telescopic system objective lens, a telescopic system eyepiece, an autocollimator and an imaging camera, and the telescopic system objective lens and the telescopic system eyepiece are arranged on a second guide rail; and a third relay reflector, a fourth relay reflector and a laser gain medium are sequentially arranged on a reflection light path of the second relay reflector, and a laser unstable resonator front mirror and a laser unstable resonator rear mirror are respectively arranged on two sides of the laser gain medium.
Furthermore, the autocollimator is provided with a diaphragm with a cross and a bulb, the diaphragm with the cross is provided with scales in the vertical direction and the horizontal direction on a bottom plate of a reticle of the autocollimator, light emitted by the bulb is focused on the reticle of the autocollimator through an objective lens of the autocollimator, and light reflected by the reticle is collimated by another objective lens and then emits parallel light.
Further, the objective lens of the telescopic system is a biconvex lens, and the eyepiece of the telescopic system is a plano-convex lens.
Furthermore, the base of the eyepiece of the telescope system is arranged on the guide rail through a stepping motor, the stepping motor device can adjust the moving distance of the eyepiece through an electric control unit, the moving precision of the stepping motor does not need to be too small, and the precision reaching 1mm meets the application of the telescope system.
Further, the laser is a gas helium neon laser.
Further, the diameter of the small hole diaphragm is 1 mm.
Furthermore, the small-hole diaphragm is installed on the first guide rail through a three-dimensional adjustable supporting structure, and the groove depth is reserved at the outer edge of the three-dimensional adjustable supporting structure and used for placing the assembling and adjusting tool.
Further, the second relay mirror may be adjusted to be 90 ° reflective or 180 ° reflective.
Furthermore, a height-adjustable supporting structure is arranged below the laser gain medium, and the outer edge of the height-adjustable supporting structure is provided with a groove depth for placing a mounting and adjusting tool.
Furthermore, a cross diaphragm is respectively arranged on a clamping sleeve of the unstable resonator front mirror and the unstable resonator rear mirror of the laser.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows:
1) the light path system of the scheme images the cavity mirror in real time by arranging the guide rail on the light path, and adjusts the pitching of the cavity mirror in real time to align the adjusting light spot with the diaphragm of the autocollimator system.
2) The telescope system is used for imaging the laser unstable resonator front mirror and the laser unstable resonator rear mirror of the laser simultaneously, and the misadjustment of front and back alignment can be checked through the guide rail.
3) The light path system can be quickly applied to the assembly and adjustment of the laser in an engineering mode based on the arrangement of the guide rail and the adjustable supporting device.
4) The optical path system has simple structure and is easy to realize.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the optical path system for aligning and adjusting the unstable resonator solid-state laser according to the present invention.
FIG. 2 is a schematic view of the cross diaphragm structure with light passing holes of the present invention.
Fig. 3 is a schematic diagram of the diaphragm structure with clear aperture in the present invention.
Fig. 4 is a schematic structural view of a cross diaphragm in the present invention.
In fig. 1: the device comprises an imaging camera 1, an autocollimator 2, a bulb 3, a diaphragm 4 with a cross, a telescopic system objective 5, a telescopic system eyepiece 6, a second guide rail 7, a stepping motor 8, a first relay reflector 9, a first guide rail 10, a small-hole diaphragm 11, a helium-neon laser 12, a half-reflecting and half-transmitting mirror 13, a second relay reflector 14, a third relay reflector 15, a fourth relay reflector 16, a laser unstable resonator front mirror 17, a height-adjustable support structure 18, a laser gain medium 19 and a laser unstable resonator rear mirror 20.
In fig. 2: a cross reticle 21; a light passing aperture 22.
In fig. 3: a light passing aperture 31.
In fig. 4: a light passing aperture 41.
Detailed Description
In order to clearly illustrate the objects, technical solutions and features of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and examples.
The invention relates to an optical path system for aligning, installing and adjusting an unstable resonator solid laser, which comprises a laser (preferably, a helium-neon laser 12), a semi-reflecting and semi-transmitting mirror 13, a small hole light fence 11, a first relay reflector 9, a second relay reflector 14, a telescopic system objective lens 5, a telescopic system eyepiece 6, an autocollimator 2, an imaging camera 1, a third relay reflector 15, a fourth relay reflector 16, a laser gain medium 19, a laser unstable resonator front mirror 17 and a laser unstable resonator rear mirror 20, wherein the small hole light fence 11 is arranged between the laser 12 and the semi-reflecting and semi-transmitting mirror 13, the small hole light fence 11 is arranged on a first guide rail 10, and the first relay reflector 9 and the second relay reflector 14 are sequentially arranged on optical paths at two sides of the semi-reflecting and semi-transmitting mirror 13; the first relay reflector 9 and the second relay reflector 14 are adjustable in position, a reflection light path of the first relay reflector 9 is provided with a telescopic system objective lens 5, a telescopic system ocular lens 6, an autocollimator 2 and an imaging camera 1, and the telescopic system objective lens and the telescopic system ocular lens (the telescopic imaging system is a Galileo imaging system) are arranged on a second guide rail 7; a third relay reflector 15, a fourth relay reflector 16 and a laser gain medium 19 are sequentially arranged on a reflection light path of the second relay reflector 14, a laser unstable resonator front mirror 17 and a laser unstable resonator rear mirror 20 are respectively arranged on two sides of the laser gain medium 19, and a height-adjustable support structure 18 can be arranged below the gain medium 19. The specific working principle is as follows:
the light path is established according to the structure in the above fig. 1, firstly, a helium-neon laser 12 is placed on an optical platform, the helium-neon laser 12 is fixed on the optical platform, then a first guide rail 10 is fixed on the optical platform, in order to make the helium-neon laser 12 and the first guide rail 10 coaxial, the helium-neon laser needs to be opened to enable the helium-neon light to pass through the small hole of the small hole diaphragm 11, then the small hole diaphragm 11 is slid, a straight line is determined according to two points, any position in the sliding process can enable the light emitted by the helium-neon laser 12 to completely pass through the small hole of the small hole diaphragm 11, and then the sliding guide rails of the helium-neon laser 12 and the first guide rail 10 are considered coaxial. In order to facilitate the adjustment of the optical path, the aperture diaphragm 11 in fig. 1 is mounted on the first guide rail 10 through a three-dimensional adjustable support structure, and the support structure can be adjusted in height and in left and right directions to adjust the aperture position of the aperture diaphragm.
The half mirror 13 and the second relay mirror 14 are mounted, but in this case the second relay mirror 14 is not mounted for the 90 degree reflection presented in figure 1, the orientation of the second relay reflector 14 is determined according to 180-degree reflection, the light returns to the small hole of the small hole diaphragm 11 through the reflection of the second relay reflector 14, the pitching of the semi-reflecting and semi-transparent mirror 13 and the second relay reflector 14 is adjusted to ensure that the returned light passes through the small hole diaphragm 11 on the first guide rail 10 after being reflected by the semi-reflecting and semi-transparent mirror 13, if the reflected light can also pass through the small hole diaphragm 11 on the guide rail completely and is not blocked, the optical path adjustment of the part of the system is considered to be finished, if the reflected light is blocked and the half-reflecting and half-transmitting mirror 13 and the second relay reflector 14 need to be adjusted, so that both the light emitted by the he-ne laser 12 and the light reflected by the second relay reflector 14 can pass through the moving aperture diaphragm 11 on the guide rail without obscuration.
The first relay reflector 9 is installed on an optical platform, light penetrating through a semi-reflecting semi-transparent mirror 13 on the optical platform is irradiated onto the first relay reflector 9, the reflected light is deflected to the position of a second guide rail 7 where a telescopic system in the figure 1 is located according to 90 degrees, then the second guide rail 7 is fixed on the optical platform, a small hole light-transmitting support frame of a small hole diaphragm 11 is placed on a first guide rail 10, the position of the guide rail and the mirror pitching of the first relay reflector 9 are adjusted to enable the light emitted by a helium-neon laser 12 to pass through the small hole diaphragm 11 on the first guide rail, and the light emitted by the helium-neon laser 12 can be considered to be coaxial with the first guide rail 10 and the second guide rail 7 when the small hole diaphragm 11 is moved on the guide rail and the light emitted by the helium-neon laser 12 can pass through a small hole.
At the front objective of the autocollimator 2 is placed the diaphragm with clear aperture of fig. 3 with a cross such that the light passes through the center of the autocollimator front objective. The imaging camera 1 is turned on, the imaging camera 1 is a photoelectric detection imaging CCD, the view field of the photoelectric detection imaging CCD is larger than that of the autocollimator, and the laser installation and debugging application can be met only by a black-and-white imaging unit under general conditions. The position of the imaging CCD is adjusted to make the aligned light in the central field of view of the imaging CCD.
After the above steps are performed, the second relay reflector 14 is turned back to 90 degrees for reflection, so that the light beam deflects to sequentially pass through the reflectors of the third relay reflector 15(90 ° reflection) and the fourth relay reflector 16(90 ° reflection), the third relay reflector 15 and the fourth relay reflector 16 are installed according to the light path of fig. 1, the reflection light path of the second relay reflector 14 is parallel to the reflection light path of the fourth relay reflector 16, and the height-adjustable support structure 18 and the laser gain medium 19 are installed. At this time, the laser unstable resonator front mirror 17 and the laser unstable resonator rear mirror 20 are not required to be installed, and the laser is designed strictly according to the law of refraction of light, so that diaphragms with clear aperture in fig. 3 are installed at the front end and the rear end of the laser gain medium, the positions of the second relay reflector 14, the third relay reflector 15, the fourth relay reflector 16 and the laser in the drawing are adjusted, so that light completely passes through small holes at the front end and the rear end of the gain medium according to the refraction theorem, and the adjustment of the optical axis of the light path is considered to be completed.
The autocollimator needs a luminous bulb, the emitted light is focused on a reticle of the autocollimator through an objective lens of the autocollimator, and the light reflected by the reticle is collimated by another objective lens to emit parallel light; the light of the laser is turned off, the imaging camera 1 is turned on, the light emitted by the bulb 3 is imaged on a reticle after auto-collimation, the reticle is provided with scales and marked with a cross-shaped image, and the cross-shaped image on the reticle of the auto-collimator 2 is seen by adjusting a focusing mirror of the imaging camera 1. Installing a laser unstable resonator front mirror 17 with pitching in front of a laser gain medium, then installing a cross diaphragm in fig. 4 on a clamping sleeve of the laser unstable resonator front mirror 17, adjusting the relative distance between a telescope system objective lens 5 and a telescope system eyepiece 6 through a stepping motor 8, then seeing the cross diaphragm image of the laser unstable resonator front mirror 17 in fig. 4, adjusting the pitching of the laser unstable resonator front mirror 17, overlapping the cross of the laser unstable resonator front mirror 17 with the cross image of an autocollimator 2, rotating the cross diaphragm of the laser unstable resonator front mirror 17 by 360 degrees after overlapping, and considering that the mirror is adjusted completely when the cross diaphragm of the laser unstable resonator front mirror 17 and the cross diaphragm image of the autocollimator can be well overlapped in the direction of 360 degrees; at this time, diaphragms with clear apertures at the front end and the rear end of the laser gain medium are taken down, the laser unstable resonator rear mirror 20 is adjusted according to the same principle, the laser unstable resonator rear mirror 20 provided with the cross diaphragms is placed on an adjusting framework, the cross image of the laser unstable resonator rear mirror 20 is imaged on the imaging camera 1 by adjusting the relative distance between the telescope system objective lens 5 and the telescope system eyepiece 6, and the rear mirror is adjusted according to the mode of the front mirror until all the cross images are superposed, so that the adjustment of the cavity mirror and the gain medium of the laser is finished.
The cross diaphragm with the light passing holes in the figure 2 is installed at the front end and the rear end of a laser gain medium 19 again, the cross diaphragm in the figure 4 is installed at the front end and the rear end of laser cavity mirrors (an unstable resonator front mirror and an unstable resonator rear mirror), a helium neon laser 12 is opened to check whether light passing through the 4 diaphragms can completely pass through the front and the rear holes of the laser gain medium 19, if so, the helium neon laser 12 is closed, whether the cross image of each laser cavity mirror on an imaging camera 1 is superposed with the cross image of an autocollimator is checked by adjusting the relative distance between a telescope system objective lens 5 and a telescope system eyepiece 6, if the helium neon light can pass through the holes of the laser gain medium 19, the cross images can be superposed, the laser is considered to be adjusted completely, the product is qualified, and if not, the adjustment is continued until the requirement is met.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides an optical path system that unstable resonator solid laser aims at dress accent which characterized in that: the laser comprises a laser, a semi-reflecting and semi-transmitting mirror, an aperture diaphragm, a first relay reflector, a second relay reflector, a telescopic system objective lens, a telescopic system eyepiece, an autocollimator, an imaging camera, a third relay reflector, a fourth relay reflector, a laser gain medium, a laser unstable resonator front mirror and a laser unstable resonator rear mirror, wherein the aperture diaphragm is arranged between the laser and the semi-reflecting and semi-transmitting mirror and is arranged on a first guide rail, and light paths at two sides of the semi-reflecting and semi-transmitting mirror are sequentially provided with the first relay reflector and the second relay reflector; the first relay reflector and the second relay reflector are adjustable in position, a reflection light path of the first relay reflector is sequentially provided with a telescopic system objective lens, a telescopic system eyepiece, an autocollimator and an imaging camera, and the telescopic system objective lens and the telescopic system eyepiece are arranged on a second guide rail; the laser gain medium comprises a first relay reflector, a second relay reflector, a third relay reflector, a fourth relay reflector and a laser gain medium, wherein the first relay reflector, the second relay reflector and the laser gain medium are sequentially arranged on a reflected light path of the second relay reflector, diaphragms with light passing apertures are arranged at the front end and the rear end of the laser gain medium, a laser unstable resonator front mirror and a laser unstable resonator rear mirror are respectively arranged on two sides of the laser gain medium, and cross diaphragms are respectively arranged on clamping sleeves of the laser unstable resonator front mirror and the laser unstable resonator rear mirror.
2. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the autocollimator is provided with a diaphragm with a cross and a bulb, the diaphragm with the cross is provided with scales in the vertical and horizontal directions on a bottom plate of a reticle of the autocollimator, light emitted by the bulb is focused on the reticle of the autocollimator through an objective lens of the autocollimator, and the light reflected by the reticle is collimated by another objective lens to emit parallel light.
3. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the objective lens of the telescope system is a biconvex lens, and the eyepiece of the telescope system is a plano-convex lens.
4. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: and the base of the eyepiece of the telescope system is arranged on the second guide rail through a stepping motor.
5. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the laser is a gas helium neon laser.
6. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the diameter of the small hole diaphragm is 1 mm.
7. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the small-hole diaphragm is installed on the first guide rail through a three-dimensional adjustable supporting structure, and the groove depth is reserved at the outer edge of the three-dimensional adjustable supporting structure and used for placing the assembling and adjusting tool.
8. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the second relay mirror may be adjusted to be 90 ° reflective or 180 ° reflective.
9. The unstable cavity solid state laser alignment-tuned optical path system of claim 1, wherein: the laser gain medium is characterized in that a height-adjustable supporting structure is arranged below the laser gain medium, and the outer edge of the height-adjustable supporting structure is reserved with a groove depth for placing a mounting and adjusting tool.
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| CN201910710285.0A CN110456521B (en) | 2019-08-02 | 2019-08-02 | Light path system for aligning, installing and adjusting unstable cavity solid laser |
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| CN201910710285.0A CN110456521B (en) | 2019-08-02 | 2019-08-02 | Light path system for aligning, installing and adjusting unstable cavity solid laser |
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| CN110456521B true CN110456521B (en) | 2020-05-26 |
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| CN112596230B (en) * | 2020-12-16 | 2022-09-20 | 航天科工微电子系统研究院有限公司 | Light path system for photoelectric tracking active chromatographic illumination |
| CN112596233A (en) * | 2020-12-16 | 2021-04-02 | 航天科工微电子系统研究院有限公司 | Optical cavity collimation method and collimation adjusting device for annular cavity slab laser |
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| US4146329A (en) * | 1977-09-14 | 1979-03-27 | The United States Of America As Represented By The Secretary Of The Navy | Autoalignment system for high power laser |
| US4664517A (en) * | 1985-06-27 | 1987-05-12 | United Technologies Corporation | Unstable confocal resonator cavity alignment system |
| CN1769855B (en) * | 2005-08-31 | 2010-06-30 | 中国科学院光电技术研究所 | Endoscope detuning monitoring system based on positive branch confocal unstable resonator and monitoring method thereof |
| CN101794960B (en) * | 2010-01-21 | 2011-12-07 | 北京大学 | Method for tuning collimation of light path of cavity of excimer laser |
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