CN217934564U - Laser device - Google Patents
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- CN217934564U CN217934564U CN202222227739.9U CN202222227739U CN217934564U CN 217934564 U CN217934564 U CN 217934564U CN 202222227739 U CN202222227739 U CN 202222227739U CN 217934564 U CN217934564 U CN 217934564U
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Abstract
The utility model discloses a laser, which comprises a light-emitting module, a tail fiber and an anti-return sheet; the anti-return sheet and the tail fiber are sequentially arranged along the direction of the laser emitted by the light-emitting module, the anti-return sheet is plated with a first enhanced reflection film, and the end face of the tail fiber close to the light-emitting module is plated with a second enhanced reflection film; and a part of system light is reflected by utilizing a second penetration reflection film on the tail fiber, so that the intensity of the system light irradiated to the anti-return sheet is reduced, and the technical effects of reducing the irradiation intensity of the system light on lens fixing glue such as a focusing mirror and the like and the influence on the ambient temperature of the end face of the optical fiber are achieved. The electric field intensity of the laser passing through the outermost film of the first antireflection reflecting film and the outermost film of the second antireflection reflecting film, the electric field intensity of the laser passing through the contact surface of the adjacent film layer in the first antireflection reflecting film and the electric field intensity of the laser passing through the contact surface of the adjacent film layer in the second antireflection reflecting film are respectively limited, the laser damage threshold of the first antireflection reflecting film and the laser damage threshold of the second antireflection reflecting film are improved, and the service life of the laser is prolonged.
Description
Technical Field
The utility model belongs to the technical field of laser equipment, concretely relates to laser instrument.
Background
When the laser works, part of system light is reversely transmitted and enters the inside of the pump source due to the reflection of the end face of the tail fiber and other reasons, and the laser chip in the pump source can be damaged by the part of laser, so that the power of the chip is reduced and even the chip fails.
In the existing laser, a filter is arranged at the front end of a focusing mirror for coupling a light beam into a tail fiber to serve as an anti-return sheet, and a high-transmittance film for increasing the transmittance of pump light and a high-reflection film for increasing the reflectivity of system light are plated on the surface of the anti-return sheet, so that the returned system light is deflected and reflected and does not enter the interior of a pump source any more. However, the system light reflected by the anti-return sheet may irradiate the position of the fixing glue of the lens such as the focusing lens, accelerate the aging failure of the fixing glue, influence the position fixing of the lens, further influence the normal use of the laser, and also irradiate the vicinity of the light emitting module of the laser, which causes the temperature on the surface of the light emitting module to rise, increases the risk of burning the light emitting module, and reduces the service life of the laser.
SUMMERY OF THE UTILITY MODEL
To address the above issues, the present invention discloses a laser to overcome the above problems or at least partially solve the above problems.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a laser comprises a light emitting module, a tail fiber and an anti-return sheet; the light-emitting module is used for exciting system light and converting the system light into laser, the anti-return sheet and the tail fiber are sequentially placed along the direction of emitting the laser by the light-emitting module, the anti-return sheet is plated with a first enhanced reflection film, and the end face, close to the light-emitting module, of the tail fiber is plated with a second enhanced reflection film; the first and second transflective films are respectively provided with a plurality of films, the electric field intensity of the laser on the surface of the outermost film of the first transflective film is less than the maximum value of the laser passing through the outermost film of the first transflective film, and the electric field intensity of the laser on the surface of the outermost film of the second transflective film is less than the maximum value of the laser passing through the outermost film of the second transflective film;
the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the first enhanced reflection film is less than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the first enhanced reflection film; the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is smaller than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film.
Optionally, the electric field intensity of the laser light on the surface of the outermost film of the first transflective film is a minimum value when the laser light passes through the outermost film of the first transflective film, and the electric field intensity of the laser light on the surface of the outermost film of the second transflective film is a minimum value when the laser light passes through the outermost film of the second transflective film.
Optionally, the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the first transflective film is the minimum value of the laser passing through any film layer of the adjacent film layers in the first transflective film; and the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is the minimum value of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film.
Optionally, one end face or both end faces of the anti-reversion sheet is plated with the first transmission/reflection enhancing film.
Optionally, an angle between the anti-returning sheet and the optical path of the laser is adjustable.
Optionally, the reflectivity of the film system of the tail fiber to system light is not less than 50%.
Optionally, the laser for preventing the system light from returning further comprises a focusing mirror; the focusing mirror is located between the tail fiber and the anti-return sheet or along the output direction of laser, and relative to the anti-return sheet, the focusing mirror is located at a position far away from the light-emitting module and used for focusing the transmission light of the anti-return sheet to the tail fiber.
The utility model has the advantages and the beneficial effects that:
the utility model discloses an among the laser instrument, through prevent returning the piece plate first increase the reflection membrance and plate the second at the terminal surface position that the tail optical fiber is close to light emitting module and increase the reflection membrance, first increase the reflection membrance and the second increases the reflection membrance and is the film system of transmission laser wavelength and reflection system optical wavelength simultaneously respectively, and the electric field intensity of laser at the surface of first outermost membrane that increases reflection membrance and second and increases the reflection membrance is less than the laser through the maximum of the outermost membrane that first increases reflection membrance and second and increases the reflection membrance respectively. Therefore, partial system light is reflected by the second enhanced reflection film on the tail fiber, the intensity of the system light irradiated to the anti-return sheet is reduced, the influence of the system light on the irradiation of lens fixing glue such as a focusing mirror and the like and the ambient temperature of the end face of the optical fiber is reduced, the position stability of the lens such as the focusing mirror and the like is improved, the light-emitting module can normally work, and the service life of the laser is further prolonged. And the first and second antireflection films can ensure the normal output of laser light by transmitting the laser wavelength. Meanwhile, the electric field intensity of the surfaces of the outermost films of the first and second enhanced reflection films is respectively smaller than the maximum value of the laser passing through the outermost films of the first and second enhanced reflection films, and the electric field intensity of the laser passing through the contact surface of the adjacent films in the first and second enhanced reflection films is smaller than the maximum value of the electric field intensity of the laser passing through any one film of the adjacent films in the first and second enhanced reflection films, so that the laser damage threshold of the first and second enhanced reflection films is improved, the effect of bearing different laser powers of the first and second enhanced reflection films is improved, and the service life of the laser is prolonged.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an external shape of a laser according to an embodiment of the present invention;
fig. 2 is a graph showing reflectivity curves for laser light of different wavelengths before the second antireflection film is optimized in the laser according to an embodiment of the present invention;
fig. 3 is a graph showing the distribution of the electric field intensity before the second transflective film is optimized in the laser according to an embodiment of the present invention;
fig. 4 is a reflectivity curve diagram of the laser with different wavelengths after the second transflective film in the laser according to the embodiment of the present invention is optimized;
fig. 5 is a distribution curve diagram of the electric field intensity after the second transmittance reflection film in the laser according to the present scheme of the present invention is optimized.
Detailed Description
For making the purpose, technical scheme and effect of the utility model clearer, will combine below the utility model discloses concrete embodiment and corresponding attached drawing are right the utility model discloses technical scheme carries out clear, complete description. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present embodiment discloses a laser, which includes a light emitting module, an anti-returning sheet 2 and a tail fiber 3. The light-emitting module is used for exciting system light and forming laser, the anti-return sheet 2 and the tail fiber 3 are sequentially placed along the direction of emitting the laser by the light-emitting module, the anti-return sheet 2 is plated with a first enhanced reflection film 21, and the end face, close to the light-emitting module, of the tail fiber 3 is plated with a second enhanced reflection film 31. The first transflective film 21 and the second transflective film 31 are respectively provided with a plurality of films, and by adjusting the number of the films and the thickness of the films of the first transflective film and the second transflective film, the electric field intensity of the laser on the surface of the outermost film of the first transflective film 21 is smaller than the maximum value of the electric field intensity of the laser through the outermost film of the first transflective film 21, and the electric field intensity of the laser on the surface of the outermost film of the second transflective film 31 is smaller than the maximum value of the electric field intensity of the laser through the outermost film of the second transflective film 31.
In this embodiment, by adjusting the number of the first enhanced reflective film and the film thickness of the second enhanced reflective film, the electric field intensity of the laser passing through the contact surface of the adjacent film in the first enhanced reflective film 21 is smaller than the maximum value of the electric field intensity of the laser passing through any film in the adjacent film in the first enhanced reflective film 21, for example, the electric field intensity of the laser passing through the contact surface of the adjacent film in the first enhanced reflective film is the minimum value of the electric field intensity of any film in the adjacent film. The electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film 31 is smaller than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film 31, for example, the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is the minimum value of the electric field intensity of any film layer of the adjacent film layers.
The first and second transmission enhancing reflection films are film systems which simultaneously transmit laser wavelength and reflect system optical wavelength. In this embodiment, the first transflective film is 99.8% transmissive to light at the laser wavelength and 99.5% reflective to light at the system light wavelength, and the second transflective film is 99.8% transmissive to light at the laser wavelength and 50% reflective to light at the system light wavelength. Therefore, partial system light can be reflected by the second enhanced reflection film, so that the intensity of the system light on the anti-return sheet is reduced, the temperature around lenses such as a light-emitting module and an internal focusing mirror is reduced, the service life of the laser is prolonged, and meanwhile, the second enhanced reflection film has a reflectivity of 50% to the light with the system light wavelength, so that the effect of reducing the coating difficulty of the anti-return sheet can be achieved.
In other embodiments, according to different requirements of the anti-returning sheet on the reflectivity of the system light and the transmissivity of the laser light, parameters such as the thicknesses of the first and second transflective films can be adjusted, and the transmissivity of the first and second transflective films to the laser wavelength and the reflectivity of the first and second transflective films to the system light wavelength are changed.
In this embodiment, the first and second transflective films are respectively plated on the side of the pigtail close to the light emitting module and the anti-return sheet, the first and second transflective films are respectively film systems that simultaneously transmit the laser wavelength and reflect the system light wavelength, and the electric field intensities of the laser on the surfaces of the outermost films of the first and second transflective films are respectively smaller than the maximum value of the laser passing through the outermost films of the first and second transflective films.
Therefore, partial system light is reflected by the second penetration reflection film on the tail fiber, the intensity of the system light irradiated to the anti-return sheet is reduced, the influence of the system light on the irradiation of lens fixing glue such as a focusing mirror and the like and the ambient temperature of the light-emitting module is reduced, the position stability of the lens such as the focusing mirror and the like is improved, the light-emitting module can normally work, and the service life of the laser is prolonged. The normal output of laser can be ensured by using the first and second enhanced reflecting films to transmit laser wavelength, and meanwhile, the electric field intensity of the surfaces of the outermost films of the first and second enhanced reflecting films is respectively smaller than the maximum value of the laser passing through the outermost films of the first and second enhanced reflecting films, so that the laser damage resistance of the outermost films of the first and second enhanced reflecting films is improved, the overall laser damage threshold of the outermost films of the first and second enhanced reflecting films is further improved, and the capability of the first and second enhanced reflecting films for bearing different laser powers is improved.
Furthermore, the laser damage resistance of the contact surface of each adjacent film layer in the first and second enhanced reflection films can be improved by the fact that the electric field intensity of the laser passing through the contact surface of the adjacent film layer in the first and second enhanced reflection films is smaller than the maximum value of the electric field intensity of the laser passing through any film layer in the adjacent film layers, so that the laser damage threshold of the first and second enhanced reflection films is further improved, the damage of the laser to the first and second enhanced reflection films is reduced, and the service lives of the first and second enhanced reflection films are prolonged.
Preferably, the electric field intensity of the laser light on the surface of the outermost film of the first transflective film 21 is the minimum value of the laser light passing through the outermost film of the first transflective film 21, and the electric field intensity of the laser light on the surface of the outermost film of the second transflective film 31 is the minimum value of the laser light passing through the outermost film of the second transflective film 31, so that the laser damage threshold of the first transflective film 21 and the second transflective film 31 can be further increased, the laser damage resistance of the first transflective film and the second transflective film can be improved, and the life of the first transflective film and the second transflective film can be further extended.
In addition, in this embodiment, the two end surfaces of the anti-returning sheet are respectively plated with the first enhanced reflection film, and the ability of the anti-returning sheet to reflect light of the system can be improved by plating the first enhanced reflection film on the two end surfaces of the anti-returning sheet, so that the protection ability of the light-emitting module is improved.
In other embodiments, according to different designs of the first anti-backflow sheet, the first anti-backflow sheet is coated with the first anti-backflow sheet on one end face, and the cost of coating the anti-backflow sheet can be reduced by utilizing the first anti-backflow sheet to transmit laser and reflect system light.
Preferably, in this embodiment, the first transflective film and the second transflective film are optimally designed by using a simulated annealing algorithm, respectively.
Specifically, first, an initial film system of the first transflective film is obtained according to the transmittance of the first transflective film to the laser wavelength and the reflectance to the system light, and similarly, a base film system of the second transflective film is obtained according to the transmittance of the second transflective film to the laser wavelength and the reflectance to the system light. And then, respectively adjusting the number of layers of the first antireflection reflection film and the second antireflection reflection film according to a simulated annealing algorithm, and respectively reducing the difference between the thicknesses of the film layers in the first antireflection reflection film and the difference between the thicknesses of the film layers in the second antireflection reflection film, thereby simplifying the film coating difficulty and avoiding the occurrence of a film layer with extremely small thickness and an excessively thick film layer. Meanwhile, electric field intensity distribution in the first and second antireflection films is respectively adjusted by increasing and decreasing the number of the film layers of the first and second antireflection films and adjusting the film layer thickness by using an analog algorithm, so that the electric field intensity of the laser passing through the surfaces of the outermost films of the first and second antireflection films is respectively the minimum value of the electric field intensity of the laser passing through the outermost film of the first antireflection film and the minimum value of the electric field intensity of the outermost film of the second antireflection film, and the electric field intensity of the laser passing through the contact surface of the adjacent film layers of the first and second antireflection films is smaller than the maximum value of the laser passing through any film layer of the adjacent film layers of the first antireflection film and the maximum value of any film layer of the adjacent film layers of the second antireflection film. In this way, optimizing the first and second transflective films by the simulated annealing algorithm can improve the simplicity of optimizing the first and second transflective films.
In other embodiments, the simulated annealing algorithm and the genetic algorithm may be simultaneously used to perform optimization design on the first enhanced reflective film and the second enhanced reflective film, for example, the genetic algorithm is used to simulate the annealing algorithm to optimize the first enhanced reflective film and the second enhanced reflective film respectively to obtain an optimization scheme, and then the simulated annealing algorithm is used to verify the optimization scheme of the first enhanced reflective film and the second enhanced reflective film, so as to improve the accuracy of the optimization design of the first enhanced reflective film and the second enhanced reflective film.
In this embodiment, the first and second transflective films are made of silicon dioxide, and the strength and the extensibility of the first and second transflective films can be improved by using the silicon dioxide.
In other embodiments, according to different designs of the first and second transflective films, one or a combination of more of hafnium oxide, silicon dioxide, magnesium fluoride, titanium dioxide, aluminum oxide, lithium fluoride, lanthanum fluoride, and zirconium oxide may be selected, so as to improve the functional diversity of the first and second transflective films.
Preferably, the angle between the anti-return sheet 2 and the light path emitted by the light-emitting module is adjustable, and the reflection path of the system light is adjusted by adjusting the angle between the anti-return sheet 2 and the light path of the laser, so that the intensity of the reflected system light irradiating the end face of the optical fiber is reduced, the temperature of the end face of the optical fiber is reduced, and the service life of the laser is prolonged.
In this embodiment, this laser instrument still includes angle regulator, prevents returning the piece and is connected with angle regulator, prevents returning the piece motion through angle regulator drive, is convenient for adjust and prevents returning the angle between the laser light path of piece and laser instrument transmission.
In addition, in the present embodiment, the laser further includes a focusing mirror 4. The focusing mirror 4 is positioned between the tail fiber 3 and the anti-return sheet 2, and the focusing mirror is utilized to focus the laser passing through the anti-return sheet to the position of the tail fiber, so that the intensity of the laser passing through the position of the tail fiber is improved, and the power of the laser is further improved.
In other embodiments, the focusing mirror can be further placed at a position far away from the light-emitting module relative to the position of the anti-returning sheet along the laser output direction according to different design processes of the laser.
Taking the second antireflection film as an example, the ratio of the parameters of the second antireflection film before optimization and the second antireflection film after optimization in the laser of this embodiment is as follows:
in this embodiment, the second transflective film has a transmittance of greater than 99.8% for 900nm to 930nm laser light and a certain reflectance for 1070nm system light, but the reflectance value is not limited to obtain an initial film system, and the specific parameters are detailed in the following table.
The parameters after the second enhanced reflective film is optimized by the optimization scheme in the embodiment are detailed in table two, that is, the second enhanced reflective film has a transmittance of more than 99.8% for the laser light of 900nm to 930nm, and has a reflectance of 50% for the system light of 1070nm, and the electric field intensity of the laser light on the surface of the outermost film of the second enhanced reflective film is the minimum value of the laser light passing through the outermost film of the second enhanced reflective film by adjusting the number and thickness of the film layers of the first enhanced reflective film and the second enhanced reflective film. Meanwhile, the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is smaller than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film by adjusting the film layer number and the film layer thickness of the first enhanced reflection film and the second enhanced reflection film.
Watch two
Comparing fig. 2 to fig. 5, it can be seen that the reflectivity of the optimized second transflective film to the laser with the wavelength of 915nm is less than 0.2%, and then the second transflective film has a high transmittance of 99.8% or more to the laser with the wavelength of 915nm and a reflectivity of 60% or more to the system light with the wavelength of 1070nm, and it can be seen from table 1 and table 2 that the thickness of the optimized second anti-reflection film is relatively uniform, so that the difficulty of coating the second anti-reflection film can be reduced, the complexity of coating the second anti-reflection film can be reduced, and the coating cost of the second anti-reflection film can be reduced. Meanwhile, the electric field intensity of the laser passing through the surface of the outermost film of the second enhanced reflection film is the minimum value of the electric field intensity of the laser passing through the outermost film of the second enhanced reflection film, and the electric field intensity of the contact surface of the adjacent film layers in the second enhanced reflection film is smaller than the maximum value of the laser in any film layer in the adjacent film layers. The laser damage resistance of the second enhanced reflection film is improved, and the service life of the second enhanced reflection film is further prolonged.
In view of the above, it is only the specific embodiments of the present invention that other modifications and variations can be made by those skilled in the art based on the above-described embodiments in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the claims.
Claims (7)
1. A laser, characterized by: comprises a light-emitting module, a tail fiber and an anti-return sheet; the light-emitting module is used for exciting system light and converting the system light into laser, the anti-return sheet and the tail fiber are sequentially placed along the direction of emitting the laser by the light-emitting module, the anti-return sheet is plated with a first enhanced reflection film, and the end face, close to the light-emitting module, of the tail fiber is plated with a second enhanced reflection film;
the first and second transflective films are respectively provided with a plurality of films, the electric field intensity of the laser passing through the surface of the outermost film of the first transflective film is less than the maximum value of the laser passing through the outermost film of the first transflective film, and the electric field intensity of the laser passing through the surface of the outermost film of the second transflective film is less than the maximum value of the laser passing through the outermost film of the second transflective film;
the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the first enhanced reflection film is less than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the first enhanced reflection film; the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is smaller than the maximum value of the electric field intensity of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film.
2. The laser of claim 1, wherein: the electric field intensity of the laser light on the surface of the outermost film of the first enhanced reflection film is the minimum value of the laser light passing through the outermost film of the first enhanced reflection film, and the electric field intensity of the laser light on the surface of the outermost film of the second enhanced reflection film is the minimum value of the laser light passing through the outermost film of the second enhanced reflection film.
3. The laser of claim 1, wherein: the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the first enhanced reflection film is the minimum value of the laser passing through any film layer of the adjacent film layers in the first enhanced reflection film; and the electric field intensity of the laser passing through the contact surface of the adjacent film layers in the second enhanced reflection film is the minimum value of the laser passing through any film layer of the adjacent film layers in the second enhanced reflection film.
4. The laser of claim 1, wherein: one end face or two end faces of the anti-returning piece are respectively plated with the first transmission/reflection increasing film.
5. The laser of claim 1, wherein: the angle between the anti-return sheet and the light path of the laser is adjustable.
6. The laser of claim 1, wherein: the reflectivity of the film system of the tail fiber to system light is not less than 50%.
7. The laser of any one of claims 1-6, wherein: the laser also comprises a focusing mirror; the focusing mirror is located between the tail fiber and the anti-return sheet or along the output direction of laser, and relative to the anti-return sheet, the focusing mirror is located at a position far away from the light-emitting module and used for focusing the transmission light of the anti-return sheet to the tail fiber.
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| CN202222227739.9U CN217934564U (en) | 2022-08-22 | 2022-08-22 | Laser device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742475A (en) * | 2023-07-14 | 2023-09-12 | 江苏华兴激光科技有限公司 | Narrow linewidth vertical cavity surface emitting laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742475A (en) * | 2023-07-14 | 2023-09-12 | 江苏华兴激光科技有限公司 | Narrow linewidth vertical cavity surface emitting laser |
| CN116742475B (en) * | 2023-07-14 | 2024-01-23 | 江苏华兴激光科技有限公司 | Narrow linewidth vertical cavity surface emitting laser |
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