CN212908504U - Light path guiding mechanism for N-type laser resonant cavity of laser - Google Patents
Light path guiding mechanism for N-type laser resonant cavity of laser Download PDFInfo
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- CN212908504U CN212908504U CN202022285722.XU CN202022285722U CN212908504U CN 212908504 U CN212908504 U CN 212908504U CN 202022285722 U CN202022285722 U CN 202022285722U CN 212908504 U CN212908504 U CN 212908504U
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Abstract
The utility model discloses a light path guiding mechanism for laser instrument N type laser resonator, including N type light path guiding mechanism (6), be equipped with the light path recess that is N shape in N type light path guiding mechanism (6), its characterized in that: when the output power of the radio frequency carbon dioxide laser is 30W and 45W, the diameter of the optical path groove is 3.0-3.1 mm; when the output power of the radio frequency carbon dioxide laser is 60W, the diameter of the optical path groove is 3.2-3.4 mm. The utility model increases the diameter of the light path groove in the N-shaped light path guiding mechanism, so that the power density of the laser in the light path groove is reduced; in the N-type laser resonant cavity of the carbon dioxide laser adopting the N-type optical path guide mechanism, the power density of laser irradiated on the laser reflector and the laser output mirror is reduced, and the purpose of protecting the lens is realized.
Description
Technical Field
The utility model belongs to the technical field of the laser technology and specifically relates to a can prolong optical lens life's a light path guiding mechanism for laser instrument N type laser resonator.
Background
The N-type resonant cavity of the radio frequency carbon dioxide laser is generally composed of a positive electrode plate, a negative electrode plate and an N-type light path guide mechanism arranged between the positive electrode plate and the negative electrode plate, wherein the positive electrode plate and the negative electrode plate are two flat electrodes, an N-type light path guide groove is arranged in the N-type light path guide mechanism, the N-type groove is provided with two end parts and two junction points, a laser reflector is respectively arranged at one end part and the two junction points, and a laser output mirror is arranged at the other end part. After the laser is started, the laser working gas in the N-shaped groove generates glow discharge under the action of a high-frequency alternating electric field generated by the positive and negative electrode plates, discharge particles are continuously oscillated and amplified between the reflector and the output mirror, and finally a laser beam capable of being utilized is generated outside the laser output resonant cavity. In the process of laser generation and stable operation of a laser, a laser reflector and an output mirror at the end part and the intersection of the groove of the N-shaped light path are continuously bombarded by high-speed particles, and a coating layer on the surface of a lens is easy to damage, so that the laser power is rapidly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the problem that prior art exists, provide a can prolong optical lens life's a light path guiding mechanism for laser instrument N type laser resonator.
The utility model aims at solving through the following technical scheme:
the utility model provides a light path guiding mechanism for N type laser resonator of laser instrument, includes N type light path guiding mechanism, is equipped with the light path recess that is N shape in N type light path guiding mechanism, its characterized in that: when the output power of the radio frequency carbon dioxide laser is 30W and 45W, the diameter of the optical path groove is 3.0-3.1 mm; when the output power of the radio frequency carbon dioxide laser is 60W, the diameter of the optical path groove is 3.2-3.4 mm.
N type light path guiding mechanism on be equipped with light path groove A, light path groove B and the light path groove C that is N shape and arranges, wherein light path groove A is parallel with a long limit on the N type light path guiding mechanism body and closes on this long limit, light path groove B's one end begins in light path groove A's one end and its other end extends to light path groove C's one end to the diagonal angle end of N type light path guiding mechanism body, light path groove C is parallel with another long limit on the N type light path guiding mechanism body and closes on this long limit.
The one end that light path recess A and light path recess B intersect corresponds the setting for first reflector seat on first intersection point laser reflection port and the back end plate, the one end that light path recess C and light path recess B intersect corresponds the setting for laser reflector seat on second intersection point laser reflection port and the front end plate, light path recess A's the other end corresponds the setting for laser output mirror seat on laser output port and the front end plate, light path recess C's the other end corresponds the setting for second reflector seat on opening laser reflection port and the back end plate.
The included angle between the light path groove A and the light path groove B is 5.2-5.5 degrees, and the included angle between the light path groove B and the light path groove C is 5.2-5.5 degrees.
And the included angle between the light path groove A and the light path groove B is equal to the included angle between the light path groove B and the light path groove C.
And the N-type light path guiding mechanism is provided with two positioning through holes for assembling and positioning.
The N-type light path guide mechanism is arranged between a positive electrode plate and a negative electrode plate in the N-type laser resonant cavity and is arranged in parallel with the positive electrode plate and the negative electrode plate, a resonant cavity body, a front end plate and a rear end plate in the N-type laser resonant cavity are combined to form a closed resonant cavity, the bottom of an inner cavity of the resonant cavity is provided with the negative electrode plate integrally formed with the resonant cavity body, the positive electrode plate and an inductance mechanism are sequentially arranged above the negative electrode plate in parallel, and the inductance mechanism is respectively connected with the positive electrode plate and the negative electrode plate to form an LC oscillation circuit; the end parts of the light path grooves with circular cross sections and bent into N shapes on the N-shaped light path guide mechanism respectively correspond to the corresponding lenses on the front end plate and the rear end plate.
And the reflecting mirror arranged correspondingly to the end part of the light path groove on the N-type light path guiding mechanism adopts a silicon mirror.
Compared with the prior art, the utility model has the following advantages:
the utility model increases the diameter of the light path groove in the N-shaped light path guiding mechanism, so that the power density of the laser in the light path groove is reduced; in the N-type laser resonant cavity of the carbon dioxide laser adopting the N-type optical path guide mechanism, the power density of laser irradiated on the laser reflector and the laser output mirror is reduced, and the purpose of protecting the lens is realized.
Drawings
Fig. 1 is a schematic structural diagram of an optical path guiding mechanism for an N-type laser resonator of a laser according to the present invention;
fig. 2 is a schematic structural diagram of the N-type optical path guiding mechanism of the present invention for an N-type laser resonator.
Wherein: 1-a resonant cavity body; 2-front end plate; 3-rear end plate; 4-an inductance mechanism; 5-positive electrode plate; 6-N type light path guide mechanism; 61-optical path groove a; 62-optical path groove B; 63-optical path groove C; 64-first junction laser reflection port; 65-second junction laser reflection port; 66-laser output port; 67-open laser reflection port; 68-positioning the through hole; 7-negative electrode plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1: an optical path guide mechanism for an N-type laser resonant cavity of a laser is characterized in that an N-shaped optical path groove is arranged in an N-type optical path guide mechanism 6, and when the output power of a radio frequency carbon dioxide laser is 30W and 45W, the diameter of the optical path groove is 3.0-3.1 mm; when the output power of the radio frequency carbon dioxide laser is 60W, the diameter of the optical path groove is 3.2-3.4 mm; and when the N-type optical path guiding mechanism 6 is used for an N-type laser resonator of a carbon dioxide laser, a silicon mirror can be used as a reflecting mirror correspondingly arranged at the end of an optical path groove on the N-type optical path guiding mechanism 6.
As shown in fig. 1, the N-type optical path guiding mechanism 6 is provided with an optical path groove a61, an optical path groove B62 and an optical path groove C63 which are arranged in an N shape, specifically, the optical path groove a61 is parallel to and close to one long side of the body of the N-type optical path guiding mechanism 6, one end of the optical path groove B62 starts from one end of the optical path groove a61, the other end of the optical path groove B62 extends to one end of the optical path groove C63 towards the diagonal end of the body of the N-type optical path guiding mechanism 6, and the optical path groove C63 is parallel to and close to the other long side of the body of the N-type optical path; the included angle between the light path groove A61 and the light path groove B62 is 5.2-5.5 degrees, and the included angle between the light path groove B62 and the light path groove C63 is 5.2-5.5 degrees, and the preferred scheme is as follows: the included angle between the light path groove a61 and the light path groove B62 is equal to the included angle between the light path groove B62 and the light path groove C63. In addition, the end where the light path groove a61 and the light path groove B62 meet is a first intersection point laser reflection port 64, the first intersection point laser reflection port 64 is arranged corresponding to a first mirror base on the rear end plate 3, the end where the light path groove C63 and the light path groove B62 meet is a second intersection point laser reflection port 65, the second intersection point laser reflection port 65 is arranged corresponding to a laser mirror base on the front end plate 2, the other end of the light path groove a61 is a laser output port 66, the laser output port 66 is arranged corresponding to a laser output mirror base on the front end plate 2, and the other end of the light path groove C63 is an open laser reflection port 67, and the open laser reflection port 67 is arranged corresponding to a second mirror base on the rear end plate 3. For fixedly assembling the N-type optical path guiding mechanism 6, two positioning through holes 68 for assembling and positioning are provided on the N-type optical path guiding mechanism 6.
As shown in fig. 2, when the N-type optical path guiding mechanism of the present invention is used in an N-type laser resonator, the N-type optical path guiding mechanism 6 is installed between the positive electrode plate 5 and the negative electrode plate 7 in the N-type laser resonator and the N-type optical path guiding mechanism 6 is parallel to the positive electrode plate 5 and the negative electrode plate 7, the resonator body 1, the front end plate 2, and the rear end plate 3 in the N-type laser resonator are combined to form a closed resonator, the bottom of the inner cavity of the resonator is provided with the negative electrode plate 7 integrally formed with the resonator body 1, the positive electrode plate 5 and the inductance mechanism 4 are sequentially parallel arranged above the negative electrode plate 7, and the inductance mechanism 4 is respectively connected with the positive electrode plate 5 and the negative electrode plate 7 to form an LC oscillating; and the ends of the light path grooves with circular cross sections and bent into N shapes on the N-shaped light path guide mechanism 6 respectively correspond to the corresponding lenses on the front end plate and the rear end plate.
The following further illustrates the optical path guiding mechanism for N-type laser resonator of the laser according to the present invention by specific comparison.
The current situation is as follows:
(1) and the end plates of the laser N-type laser resonant cavity corresponding to the three laser reflection ports, such as the first intersection point laser reflection port 64, the second intersection point laser reflection port 65, the opening laser reflection port 67 and the like, are respectively provided with a laser reflector.
(2) The existing reflector is an imported copper reflector, the cost is about 1000 yuan/piece, and the service life is 1.5-2 years.
The improvement principle is as follows: the bearing capacity of the laser reflection lens to the laser power has a threshold range, the laser power borne by the improved front reflection lens is larger than the bearing threshold of the lens, and the laser power borne by the improved rear reflection lens is smaller than the bearing threshold, so that the improved rear reflection lens cannot be damaged in the whole life cycle of the laser.
Through carrying out a plurality of tests on the diameter parameters of the optical path groove, the optimal scheme determined finally is as follows:
(1) a laser with a laser output power of 45W, wherein the diameter d =3mm of the optical path groove in the N-type optical path guiding mechanism 6;
(2) in a laser having a laser output of 60W, the diameter d =3.40mm of the optical path groove in the N-type optical path guiding mechanism 6.
The diameter of the light path groove in the existing product is d =2.7mm, and the reason is two: 1) the cost for acquiring the copper mirror by the imported product is low, the selling price of the finished product is high, and the imported product can accept the price of the copper mirror; 2) when the diameter d =2.7mm of the light path groove, the diameter of the laser beam is smaller, the energy is more concentrated, and the laser mode is better.
The utility model increases the diameter of the light path groove of the laser with the laser output power of 45W from 2.7mm to 3mm in the improvement process, theoretically, the laser mode will be slightly deteriorated, but the performance of the laser in practical application is not influenced; in addition, the diameter of the optical path groove cannot be increased too much, and when the diameter of the optical path groove of the 45W laser is increased to 3.5mm, the laser mode is obviously reduced, and the service performance of the laser is influenced. After testing 45W laser, the optimal numerical value of the diameter of the light path groove is 3.0 mm-3.10 mm, and in the range, the silicon mirror used as a reflector is not easy to damage, and meanwhile, the laser mode is not obviously deteriorated, and the normal use performance of the laser is not influenced.
An example of the improved scheme is as follows: the improved scheme is specifically explained by taking a radio frequency carbon dioxide laser with the laser output power of 45W as an example.
(1) Increasing the diameter of the optical path groove from 2.7mm to 3mm, then:
diameter before and after improvement: d1=2.7mm, d2=3 mm;
radius before and after improvement: r1=1.35mm, r2=1.5 mm;
the cross-sectional area of the front and rear light path grooves is improved: s1=3.14 × 1.35=5.72mm2；
S2=3.14*1.5*1.5=7.06 mm2；
Cross section increase rate of the improved optical path groove: (7.06-5.72) ÷ 5.72= 23.4%.
(2) Calculating the laser power borne on the laser reflecting mirror:
the reflectivity of the laser output mirror to the laser is 85% and the transmittance is 15%, that is, 85% of the laser oscillated in the resonant cavity reaches the laser output mirror and is reflected by the laser output mirror to the resonant cavity to continue to participate in the laser oscillation, and only 15% of the laser is output to the outside of the resonant cavity through the laser output mirror and is used for laser processing.
The output power is 45W, the output power accounts for 15%, and the total power of the laser in the resonant cavity is as follows: p =45 ÷ 15% =300W, the laser power carried by the laser mirror in the cavity is 300W.
The laser power density carried by the laser mirror in the resonant cavity is as follows:
before the improvement: P/S1=300 ÷ 5.72=52.45W/mm2=5245W/cm2；
After the improvement: P/S2=300 ÷ 7.06= 42.49W/mm2=4249W/cm2；
The laser power density born by the lens is reduced after improvement: 5245 4249= 996W/cm2。
The laser power born by the laser reflection lens is reduced, but the power density of the laser projected on the reflection lens is not uniformly distributed but is in Gaussian distribution, the power density of the center of the circle of the lens is the highest, and the power density of the position which is farther away from the center of the circle outwards along the radial direction is smaller, so that the capacity of bearing the laser power of the area near the center of the circle of the lens positively influences the service life of the lens.
The improvement effect is as follows: the improved rear reflector uses an imported silicon mirror, the cost is about 200 yuan/piece, and the mirror cannot be damaged within the service life of the laser; if the reflecting mirror is made of a domestic silicon mirror, the cost is about 30-50 yuan/piece, and the reflecting mirror cannot be damaged within the service life of the laser.
The copper mirror has better laser bearing capacity than the silicon mirror, if not improved, the silicon mirror can not be used on the existing laser, and can be damaged by laser very quickly, if the copper mirror is used, the cost of the product is very high, no market competitiveness exists at all, the service life is limited, the later maintenance cost is high, and the commercialization of the product is difficult to realize. In the intense commercial competition, we are forced to make the technical improvement, the product performance is improved, the product cost is reduced, and the market competitiveness of the product is greatly improved.
The utility model increases the diameter of the light path groove in the N-shaped light path guiding mechanism, so that the power density of the laser in the light path groove is reduced; in the N-type laser resonant cavity of the carbon dioxide laser adopting the N-type optical path guide mechanism, the power density of laser irradiated on the laser reflector and the laser output mirror is reduced, and the purpose of protecting the lens is realized.
The above embodiments are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea provided by the present invention all fall within the protection scope of the present invention; the technology not related to the utility model can be realized by the prior art.
Claims (8)
1. The utility model provides a light path guiding mechanism for N type laser resonator of laser instrument, includes N type light path guiding mechanism (6), is equipped with the light path recess that is N shape in N type light path guiding mechanism (6), its characterized in that: when the output power of the radio frequency carbon dioxide laser is 30W and 45W, the diameter of the optical path groove is 3.0-3.1 mm; when the output power of the radio frequency carbon dioxide laser is 60W, the diameter of the optical path groove is 3.2-3.4 mm.
2. An optical path guiding mechanism for an N-type laser resonator of claim 1, wherein: n type light path guiding mechanism (6) on be equipped with light path groove A (61) that are N shape and arrange, light path groove B (62) and light path groove C (63), wherein light path groove A (61) are parallel with a long limit on N type light path guiding mechanism (6) body and are close to this long limit, the one end of light path groove B (62) is started in the one end of light path groove A (61) and its other end extends to the one end of light path groove C (63) to the diagonal angle end of N type light path guiding mechanism (6) body, light path groove C (63) are parallel with another long limit on N type light path guiding mechanism (6) body and are close to this long limit.
3. An optical path guiding mechanism for an N-type laser resonator of claim 2, wherein: one end of the light path groove A (61) and the light path groove B (62) which are intersected is a first intersection point laser reflection port (64), the first intersection point laser reflection port (64) is arranged corresponding to a first reflector seat on the rear end plate (3), one end of the light path groove C (63) which is intersected with the light path groove B (62) is a second intersection point laser reflection port (65), the second intersection point laser reflection port (65) is arranged corresponding to a laser reflection mirror base on the front end plate (2), the other end of the light path groove A (61) is a laser output port (66), the laser output port (66) is arranged corresponding to the laser output mirror base on the front end plate (2), the other end of the optical path groove C (63) is provided with an opening laser reflection port (67), and the opening laser reflection port (67) is arranged corresponding to the second reflector base on the rear end plate (3).
4. An optical path guiding mechanism for an N-type laser resonator of claim 2, wherein: the included angle between the light path groove A (61) and the light path groove B (62) is 5.2-5.5 degrees, and the included angle between the light path groove B (62) and the light path groove C (63) is 5.2-5.5 degrees.
5. The optical path guiding mechanism for an N-type laser resonator of claim 4, wherein: and the included angle between the light path groove A (61) and the light path groove B (62) is equal to the included angle between the light path groove B (62) and the light path groove C (63).
6. An optical path guiding mechanism for an N-type laser resonator of a laser as defined in claim 1 or 2, wherein: and two positioning through holes (68) for assembling and positioning are formed in the N-type light path guiding mechanism (6).
7. An optical path guiding mechanism for an N-type laser resonator of claim 1, wherein: the N-type light path guide mechanism (6) is arranged between a positive electrode plate (5) and a negative electrode plate (7) in the N-type laser resonant cavity, the N-type light path guide mechanism (6) is arranged in parallel with the positive electrode plate (5) and the negative electrode plate (7), a resonant cavity body (1), a front end plate (2) and a rear end plate (3) in the N-type laser resonant cavity are combined to form a closed resonant cavity, the bottom of an inner cavity of the resonant cavity is provided with the negative electrode plate (7) which is integrally formed with the resonant cavity body (1), the positive electrode plate (5) and an inductance mechanism (4) are sequentially arranged above the negative electrode plate (7) in parallel, and the inductance mechanism (4) is respectively connected with the positive electrode plate (5) and the negative electrode plate (7) to form an; the end parts of the light path grooves with circular cross sections and N-shaped bent sections on the N-shaped light path guide mechanism (6) respectively correspond to the corresponding lenses on the front end plate (2) and the rear end plate (3).
8. The optical path guiding mechanism for an N-type laser resonator of claim 1 or 7, wherein: and the reflecting mirror arranged correspondingly to the end part of the light path groove on the N-type light path guiding mechanism (6) adopts a silicon mirror.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022285722.XU CN212908504U (en) | 2020-10-14 | 2020-10-14 | Light path guiding mechanism for N-type laser resonant cavity of laser |
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| CN202022285722.XU CN212908504U (en) | 2020-10-14 | 2020-10-14 | Light path guiding mechanism for N-type laser resonant cavity of laser |
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