CN219737839U - Low-power mid-infrared laser optical fiber space coupling device - Google Patents
Low-power mid-infrared laser optical fiber space coupling device Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 116
- 230000008878 coupling Effects 0.000 title claims abstract description 66
- 238000010168 coupling process Methods 0.000 title claims abstract description 66
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 66
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims abstract description 45
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 28
- 150000002222 fluorine compounds Chemical group 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004476 mid-IR spectroscopy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a low-power mid-infrared laser fiber space coupling device, and belongs to the field of optical communication devices. The device comprises: a mirror, a fiber collimator, an optical fiber, and a reference laser; the reflecting mirror is arranged at the junction of the light path of the middle infrared laser and the light path of the reference laser; the optical fiber collimator and the optical fiber are arranged on the optical path between the reflector and the reference laser, the lens side of the optical fiber collimator is aligned with the reflector, the tail fiber side of the optical fiber collimator is connected with one end of the optical fiber, and the other end of the optical fiber is connected with the output end of the reference laser; the angles of the reflecting mirror and the optical fiber collimator are adjustable, and laser emitted by the reference laser can be directly observed by using a laser observation card or naked eyes. By means of the device, the problems that the middle infrared laser is difficult to observe and the coupling efficiency is low when the middle infrared laser is coupled into the optical fiber from space under low power can be solved by reversely incident reference laser and iteratively adjusting the incident laser.
Description
Technical Field
The utility model relates to the field of optical communication devices, in particular to a low-power middle-infrared laser fiber space coupling device.
Background
The 3-5 micron mid-infrared band laser has important application in the aspects of directional infrared countermeasure, biomedical treatment, environmental monitoring, optical communication, quantum optics and the like. In order to make mid-infrared lasers more convenient for use in a variety of applications, there is a general trend to couple a spatial beam into an optical fiber. Fluoride fibers have a flat attenuation curve in the mid-infrared wavelength range and a refractive index close to that of quartz, and have lower return loss and lower fresnel reflection than sulfide fibers, so fluoride fibers are often used in spatial coupling of mid-infrared lasers, and single-mode fluoride fibers are often selected for coupling operation in order to achieve fundamental mode laser output.
At present, the optical fiber-space coupling technical schemes aiming at middle infrared band laser are few, most of the existing optical fiber-space coupling technical schemes are aiming at visible light and near infrared band laser, the technical schemes are usually to connect optical fibers on collimators, the collimators are fixed on a five-axis or six-axis optical adjusting frame, and the end face of the optical fibers and the optical axis of the laser are coaxially overlapped by adjusting each dimension so as to achieve the optimal coupling state. For example, in the technical solutions disclosed in patent documents with application numbers CN202011062350.2, CN202110561212.7 and CN200620079357.4, a laser observation card or a direct naked eye observation mode is generally adopted to initially find a coupling position of a laser light source incident on an optical fiber collimator, and each dimension is adjusted by a five-axis or six-axis optical adjusting frame to enable an end face of an optical fiber to be coaxial with an optical axis of the laser, so that coupling efficiency is further improved.
When the laser light source is visible or near infrared band laser and the power is enough to be observed by a laser observation card or naked eyes, the direct alignment coupling mode is simple and convenient, but the following problems may exist when the technical scheme is applied to the low-power mid-infrared laser which is spatially coupled into the optical fiber: firstly, low-power unfocused mid-infrared laser is difficult to directly observe by a laser observation card; secondly, the displacement of the five-axis or six-axis optical adjusting frame in the optical axis direction is limited, so that the beam waist of the mid-infrared laser is difficult to be positioned on the end face of the optical fiber, and the coupling efficiency is low.
In summary, since the low-power mid-infrared laser is difficult to observe directly by using a laser observation card or naked eyes, when the low-power mid-infrared laser is spatially coupled into the optical fiber, there are problems of difficulty in observation, low coupling efficiency, and the like.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a low-power middle infrared laser optical fiber space coupling device, which aims to solve the problems that the low-power middle infrared laser is difficult to observe when being spatially coupled into an optical fiber and the coupling efficiency is low.
Based on the above object, the present utility model provides a low-power mid-infrared laser fiber space coupling device, which comprises: a mirror, a fiber collimator, an optical fiber, and a reference laser; wherein the reflecting mirror is arranged at the intersection point of the light path of the mid-infrared laser and the light path of the reference laser; the optical fiber collimator and the optical fiber are arranged on an optical path between the reflecting mirror and the reference laser, the lens side of the optical fiber collimator is aligned with the reflecting mirror, the tail fiber side of the optical fiber collimator is connected with one end of the optical fiber, and the other end of the optical fiber is connected with the output end of the reference laser; the angles of the reflecting mirror and the optical fiber collimator are adjustable, and laser emitted by the reference laser can be directly observed by using a laser observation card or naked eyes.
Optionally, the device further comprises a lens module arranged on the optical path between the mid-infrared laser and the mirror.
Optionally, the lens module includes two parallel plano-convex lenses, an incident surface of each plano-convex lens is perpendicular to the light path and the light path passes through a center position of the lens, and a distance between the two plano-convex lenses is adjustable. Optionally, the optical path of the mid-infrared laser coincides with the optical path of the reference laser. Optionally, the reference laser is a visible laser or a near infrared laser.
Optionally, the optical fiber is a fluoride optical fiber.
Optionally, the fluoride fiber is a single mode fluoride fiber.
Optionally, the reflecting mirror is fixed on a first two-axis optical adjusting frame, and the optical fiber collimator is fixed on a second two-axis optical adjusting frame.
Optionally, the lens module is fixed on a three-dimensional adjustment platform.
Optionally, the device further comprises a power meter for connecting one end of the optical fiber to the reference laser.
The scheme has the following beneficial effects: by utilizing the low-power mid-infrared laser optical fiber space coupling device, the problems that the mid-infrared laser is difficult to observe and the coupling efficiency is low when the mid-infrared laser is coupled into the optical fiber from space under low power can be solved by reversely inputting the reference laser, iteratively adjusting the incident laser and finely adjusting the beam waist diameter position and the size of the incident laser, and the space coupling efficiency of the low-power mid-infrared laser and the optical fiber is improved. The method comprises the following steps:
first: aiming at the problem that low-power unfocused middle-infrared laser is difficult to directly observe by using a laser observation card or naked eyes, so that the low-power middle-infrared laser is high in space coupling difficulty, laser emitted by a reference laser and capable of directly observing by using the laser observation card or naked eyes is reversely incident into an optical fiber, and finally the reference laser is incident into the center of an emergent end face of the middle-infrared laser by adjusting the angle direction of a reflecting mirror and an optical fiber collimator, so that a coupling light path can be approximately determined, and the middle-infrared laser can be positively incident into the end face of an optical fiber core; second,: after ensuring that the mid-infrared laser energy is positively incident to the end face of the fiber core of the optical fiber, the coupling power can be further improved by replacing a reference laser behind the optical fiber with a power meter, detecting the power of the mid-infrared laser which is already coupled into the optical fiber by using the power meter, and continuously iteratively adjusting the angle directions of the reflecting mirror and the optical fiber collimator; third,: the beam waist diameter of the middle infrared laser can be precisely adjusted by adjusting the position of the lens, so that the beam waist diameter of the middle infrared laser can be matched with the mode field diameter of the optical fiber, the beam waist of the middle infrared laser is further ensured to be positioned on the end face of the optical fiber, and the coupling efficiency is further improved.
Drawings
FIG. 1 is a schematic diagram of a low-power mid-IR laser fiber space coupling device according to an embodiment of the utility model;
fig. 2 is a light path diagram of a low-power mid-infrared laser fiber space coupling device according to a second embodiment of the present utility model.
Description of the embodiments
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.
It is to be understood that the embodiments set forth below represent the necessary information to enable those skilled in the art to practice the embodiments and illustrate the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims.
It will be further understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
It will be further understood that the terms "upper," "lower," "left," "right," "front," "rear," "bottom," "middle," "top," and the like may be used herein to describe various elements and that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings merely to facilitate describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operate in a particular orientation, and that these elements should not be limited by these terms.
These terms are only used to distinguish one element from another element. For example, a first element could be termed a "upper" element, and, similarly, a second element could be termed a "upper" element, depending on the relative orientation of the elements, without departing from the scope of the present disclosure.
It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Embodiment one: the embodiment provides a low-power mid-infrared laser fiber space coupling device as shown in fig. 1.
As shown in fig. 1, the low-power mid-infrared laser fiber space coupling device of the present embodiment includes: lens modules (i.e., lens L1 and lens L2), mirror M1, fiber collimator C1, optical fiber, reference laser, and power meter.
In practical application, the arrow in fig. 1 is used to arrange a mid-infrared laser for emitting low-power mid-infrared laser light.
The optical path of the mid-infrared laser coincides with the optical path of the reference laser, the reflector M1 is arranged at the intersection point of the mid-infrared laser and the optical path of the reference laser, the lens module is arranged on the optical path between the mid-infrared laser and the reflector M1, the optical fiber collimator C1 and the optical fiber are arranged on the optical path between the reflector M1 and the reference laser, the lens side of the optical fiber collimator C1 is aligned with the reflector M1, the tail fiber side of the optical fiber collimator C1 is connected with one end of the optical fiber, the other end of the optical fiber is connected with the output end of the reference laser, or the other end of the optical fiber is connected with the power meter.
In this embodiment, the mirror M1 is fixed on the first two-axis optical adjustment frame, and the optical fiber collimator C1 is fixed on the second two-axis optical adjustment frame, so that the angles of the mirror M1 and the optical fiber collimator C1 are adjustable, and the central position of the light emitting window of the mid-infrared laser can be adjusted by adjusting the two-axis optical adjustment frames where the mirror M1 and the optical fiber collimator C1 are located in a matching manner.
In this embodiment, the lens module includes two parallel plano-convex lenses, namely a lens L1 and a lens L2, where the lenses L1 and L2 are respectively fixed on the three-dimensional adjustment platform, the incident surface of each lens is perpendicular to the optical path and the optical path passes through the center of the lens, the distance between the two lenses is adjustable, and the positions of the lenses are adjusted to keep unchanged when the lenses are installed and the positions of the spots are observed by the beam analyzer. The positions of the lens L1 and the lens L2 are adjusted, so that the position and the size of the laser beam waist diameter emitted by the mid-infrared laser can be changed, and the space coupling efficiency of the mid-infrared laser is improved.
In this embodiment, the reference laser is a near infrared laser, and is used to emit near infrared laser as reference laser; as other embodiments, other types of lasers may be selected as the reference laser, so long as the laser light emitted by the reference laser can be directly observed by naked eyes or a laser observation card, for example, a visible laser may be further used as the reference laser for emitting the visible laser light as the reference laser light.
In this embodiment, the optical fiber is a fluoride optical fiber, and is a single-mode fluoride optical fiber; as other embodiments, the type of the optical fiber can be adjusted according to practical needs, for example, other optical fibers similar to the fluoride optical fiber in the prior art can be selected.
By using the low-power intermediate infrared laser optical fiber space coupling device of the embodiment, the working principle of spatially coupling the intermediate infrared laser into the single-mode fluoride optical fiber is as follows:
firstly, fixing the low-power middle infrared laser fiber space coupling device, opening a middle infrared laser, and ensuring that a middle infrared laser beam to be coupled is incident to the optical center positions of lenses L1 and L2;
then, the middle infrared laser is closed, the output end of the near infrared laser is connected with the single-mode fluoride optical fiber, the near infrared laser is opened, and the power of near infrared laser (i.e. reference laser) emitted by the near infrared laser is adjusted to a state which can be obviously observed by naked eyes or a laser observation card;
then, the optical fiber collimator C1 and the two-axis optical adjusting frame where the reflecting mirror M1 are positioned are matched and adjusted, so that near infrared laser can reversely enter the center position of an emergent port of the mid-infrared laser;
then, the near infrared laser is closed, the near infrared laser is replaced by a power meter to be connected with the single-mode fluoride optical fiber, the mid infrared laser is opened, at the moment, part of mid infrared laser is coupled into the single-mode fluoride optical fiber, and the coupling power can be further improved (namely, the coupling efficiency can be further improved) by continuously iteratively adjusting a two-axis optical adjusting frame where the reflecting mirror M1 and the optical fiber collimator C1 are positioned;
it should be noted that, the function of the power meter is to detect the power of the mid-infrared laser that has been coupled into the single-mode fluoride fiber, so as to reflect the coupling efficiency according to the coupling power, in practical application, a power meter may be specially configured in the low-power mid-infrared laser fiber space coupling device, or an existing power meter may be used.
Finally, by adjusting the positions of the lenses L1 and L2, the beam waist diameter position and the beam waist size of the mid-infrared laser (i.e., the incident laser) emitted by the mid-infrared laser are changed, so that the coupling power can be further improved.
In summary, in this embodiment, aiming at the problem that the low-power unfocused mid-infrared laser is difficult to directly observe by using a laser observation card or naked eyes, which results in high spatial coupling difficulty of the low-power mid-infrared laser, the wide light transmission range characteristic of the fluoride optical fiber is utilized, the near-infrared laser with proper power is reversely incident into the fluoride optical fiber as reference laser, and the reference laser is finally incident into the center of the outgoing end face of the mid-infrared laser by adjusting the angle direction of the reflector and the optical fiber collimator, so that the coupling light path can be approximately determined and the mid-infrared laser can be normally incident into the end face of the fluoride optical fiber core; then, after ensuring that the mid-infrared laser energy is normally incident to the end face of the fiber core of the fluoride optical fiber, the coupling power can be further improved by replacing a reference laser behind the optical fiber with a power meter, detecting the power of the mid-infrared laser which is already coupled into the optical fiber by using the power meter, and continuously iteratively adjusting the angle directions of the reflecting mirror and the optical fiber collimator; finally, the beam waist diameter of the middle infrared laser can be precisely adjusted by adjusting the position of the lens, so that the beam waist diameter of the middle infrared laser can be matched with the mode field diameter of the fluoride optical fiber, the beam waist of the middle infrared laser is further ensured to be positioned on the end face of the fluoride optical fiber, and the coupling efficiency is further improved.
That is, the embodiment solves the problems that the mid-infrared laser is difficult to observe and the coupling efficiency is low when the mid-infrared laser is spatially coupled into the single-mode fluoride optical fiber under low power by means of the low-power mid-infrared laser optical fiber spatial coupling device, and improves the spatial coupling efficiency of the low-power mid-infrared laser and the single-mode fluoride optical fiber by reversely incident reference laser, iteratively adjusting the incident laser and finely adjusting the beam waist diameter position and the beam waist size of the incident laser.
In addition, compared with the prior art, the utility model has universality, and can be suitable for visible/near infrared band lasers, and is more suitable for low-power and middle infrared band lasers which are difficult to observe. In addition, the optical elements used by the low-power mid-infrared laser fiber space coupling device are all the optical elements existing in the market, so that the low-power mid-infrared laser fiber space coupling device is easy to obtain, and the operation method is simple, reliable and easy to operate.
In this embodiment, the lens module is formed by combining two parallel arranged plano-convex lenses with adjustable space, and as other embodiments, when the type of the selected optical fiber is changed, the beam waist diameter of the mid-infrared laser can be precisely adjusted by changing a proper lens combination, so that the beam waist diameter of the mid-infrared laser can be matched with the mode field diameter of the selected optical fiber, the beam waist of the mid-infrared laser is ensured to be positioned on the end face of the optical fiber, and the coupling efficiency is further improved.
Embodiment two: the embodiment provides a low-power mid-infrared laser fiber space coupling device as shown in fig. 2.
As shown in fig. 2, the low-power mid-infrared laser fiber space coupling device of the present embodiment includes: mirror M1, fiber collimator C1, fiber and reference laser.
In practical application, the arrow in fig. 2 is used to arrange a mid-infrared laser for emitting low-power mid-infrared laser light.
Specifically, the optical path of the mid-infrared laser coincides with the optical path of the reference laser, the reflector M1 is arranged at the intersection point of the mid-infrared laser and the optical path of the reference laser, the optical fiber collimator C1 and the optical fiber are arranged on the optical path between the reflector M1 and the reference laser, the lens side of the optical fiber collimator C1 is aligned with the reflector M1, the pigtail side of the optical fiber collimator C1 is connected with one end of the optical fiber, the other end of the optical fiber is connected with the output end of the reference laser, or the other end of the optical fiber is connected with the power meter.
The specific implementation of the reflecting mirror M1, the optical fiber collimator C1, the reference laser, the optical fiber, etc. may be referred to the first embodiment, and will not be described herein again.
It can be seen that, compared with the first embodiment, the present embodiment saves a lens module, and accordingly, when the low-power mid-infrared laser optical fiber space coupling device of the present embodiment is used to spatially couple the mid-infrared laser into the single-mode fluoride optical fiber, only the reference laser with appropriate power is required to be reversely incident into the fluoride optical fiber, and the reference laser is finally incident into the center of the outgoing end surface of the mid-infrared laser by adjusting the angle direction of the reflector and the optical fiber collimator, so that the coupling light path can be approximately determined and the mid-infrared laser can be normally incident into the fiber core end surface of the fluoride optical fiber; then, after ensuring that the mid-infrared laser energy is normally incident to the end face of the fiber core of the fluoride optical fiber, the coupling power can be further improved by replacing the reference laser behind the optical fiber with a power meter, detecting the power of the mid-infrared laser which is already coupled into the optical fiber by using the power meter, and continuing to iteratively adjust the angle directions of the reflecting mirror and the optical fiber collimator.
That is, the embodiment can solve the problems that the mid-infrared laser is difficult to observe and the coupling efficiency is low when the mid-infrared laser is spatially coupled into the single-mode fluoride optical fiber under low power by reversely incident the reference laser and iteratively adjusting the incident laser, and improve the spatial coupling efficiency of the low-power mid-infrared laser and the single-mode fluoride optical fiber.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. A low power mid-infrared laser fiber space coupling device, the device comprising: a mirror, a fiber collimator, an optical fiber, and a reference laser; wherein,,
the reflecting mirror is arranged at the junction of the light path of the middle infrared laser and the light path of the reference laser;
the optical fiber collimator and the optical fiber are arranged on an optical path between the reflecting mirror and the reference laser, the lens side of the optical fiber collimator is aligned with the reflecting mirror, the tail fiber side of the optical fiber collimator is connected with one end of the optical fiber, and the other end of the optical fiber is connected with the output end of the reference laser;
the angles of the reflecting mirror and the optical fiber collimator are adjustable, and laser emitted by the reference laser can be directly observed by using a laser observation card or naked eyes.
2. The low power mid-infrared laser fiber space coupling device of claim 1, further comprising a lens module disposed in the optical path between the mid-infrared laser and the mirror.
3. The low power mid-infrared laser fiber space coupling device according to claim 2, wherein the lens module comprises two plano-convex lenses arranged in parallel, each plano-convex lens having an incident surface perpendicular to the optical path and the optical path passing through the center of the lens, the spacing between the plano-convex lenses being adjustable.
4. The low power mid-infrared laser fiber space coupling device of claim 1 or 2, wherein the optical path of the mid-infrared laser coincides with the optical path of the reference laser.
5. The low power mid-infrared laser fiber space coupling device of claim 4, wherein the reference laser is a visible laser or a near infrared laser.
6. The low power mid-infrared laser fiber space coupling device of claim 1, wherein the optical fiber is a fluoride optical fiber.
7. The low power mid-infrared laser fiber space coupling device of claim 6, wherein the fluoride fiber is a single mode fluoride fiber.
8. The low power mid-infrared laser fiber space coupling device of claim 1, wherein the reflector is fixed to a first two-axis optical mount and the fiber collimator is fixed to a second two-axis optical mount.
9. A low power mid-infrared laser fiber space coupling device according to claim 2 or 3, wherein the lens module is fixed to a three-dimensional adjustment platform.
10. The low power mid-infrared laser fiber space coupling device of claim 1, further comprising a power meter for connecting an end of the optical fiber to the reference laser.
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| CN202320634819.8U CN219737839U (en) | 2023-03-28 | 2023-03-28 | Low-power mid-infrared laser optical fiber space coupling device |
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| CN202320634819.8U CN219737839U (en) | 2023-03-28 | 2023-03-28 | Low-power mid-infrared laser optical fiber space coupling device |
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