Optical fiber coupling type acousto-optic device and optical fiber laser

Abstract

The utility model discloses an optical fiber coupling type acousto-optic device and an optical fiber laser, and relates to the technical field of acousto-optic devices. The optical fiber coupling type acousto-optic device comprises a shell with a containing cavity, an acousto-optic crystal and a matching circuit board which are arranged in the containing cavity, a piezoelectric transducer arranged between the acousto-optic crystal and the matching circuit board, and a radio frequency signal connector connected to the shell and located on the side, away from the acousto-optic crystal, of the matching circuit board. The input collimator and the output collimator are connected to the shell and distributed on the two opposite sides of the acousto-optic crystal; a first shielding part and a first light transmitting part are arranged at the position, close to the first side wall, of the shell, the first shielding part is provided with a first columnar face arranged on the first side wall in a concave mode, an opening of the first columnar face faces the containing cavity, and the first shielding part is used for preventing zero-order diffraction light and / or second-order diffraction light from entering the output collimator; the first light transmitting part is used for transmitting the first-order diffraction light and then enabling the first-order diffraction light to enter the output collimator. The optical fiber coupling type acousto-optic device and the optical fiber laser can improve the bearing capacity of optical power.

Description

Technical Field

[0001] The utility model relates to the technical field of acousto-optic devices, and in particular to an optical fiber coupled acousto-optic device and an optical fiber laser. Background Art

[0002] Fiber-coupled acousto-optic devices use fiber collimators to couple light on both sides of the free-space acousto-optic device so that it can be easily used in fiber-optic systems. It mainly uses the basic principle of acousto-optic interaction. The RF electrical signal output by the driving power supply is applied to the piezoelectric transducer through an impedance matching circuit. The piezoelectric transducer converts the signal into ultrasonic waves that propagate in the acousto-optic medium, forming an equivalent phase grating. When the input laser beam is incident on the acousto-optic medium at a certain angle through the input collimator, the laser beam will diffract, and the first-order diffracted light after diffraction is output through the output collimator and fiber coupling.

[0003] Since in practical applications, the laser beam passing through the acousto-optic medium usually does not undergo perfect Bragg diffraction, but is between Bragg diffraction and Raman diffraction, therefore, a general fiber-coupled acousto-optic device will generate zero-order diffraction light, first-order diffraction light, and second-order diffraction light. However, existing fiber-coupled acousto-optic devices can only output first-order diffraction light, and both the zero-order diffraction light and the second-order diffraction light will remain inside the device. In this way, both the zero-order diffraction light and the second-order diffraction light have the risk of damaging the output collimator and causing the glue filling the gap between the glass tube and the shell to fail. Especially when the fiber-coupled acousto-optic device works at a higher optical power, the zero-order diffraction light and the second-order diffraction light directly hit the output collimator, which can easily cause the output collimator to burn. In order to avoid the above problems, existing fiber-coupled acousto-optic devices can only work at a lower optical power (generally between 3W and 5W), and their light tolerance is poor. Utility Model Content

[0004] The utility model aims to provide a fiber-coupled acousto-optic device and a fiber laser, which can improve the optical power bearing capacity.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In one aspect of the utility model, a fiber-coupled acousto-optic device is provided, which includes a housing with a receiving cavity, an acousto-optic crystal and a matching circuit board arranged in the receiving cavity and arranged along a first direction, a piezoelectric transducer arranged between the acousto-optic crystal and the matching circuit board, a radio frequency signal connector connected to the housing and located on the side of the matching circuit board away from the acousto-optic crystal, an input collimator and an output collimator connected to the housing and distributed on opposite sides of the acousto-optic crystal along a second direction; the first direction is perpendicular to the second direction; a first shielding portion and a first light-transmitting portion are provided near the first side wall of the housing, the first shielding portion has a first cylindrical surface recessed on the first side wall, and the opening of the first cylindrical surface faces the receiving cavity, the first shielding portion is used to block zero-order diffraction light and / or second-order diffraction light from being incident on the output collimator; the first light-transmitting portion is used to allow the first-order diffraction light to pass through and then be incident on the output collimator; the first side wall is the side wall of the receiving cavity located between the acousto-optic crystal and the output collimator. The fiber-coupled acousto-optic device can improve the optical power bearing capacity.

[0007] Optionally, an orthographic projection area of ​​the first light-transmitting portion along the second direction is between 1.5 times and 2.5 times an orthographic projection area of ​​an exit light spot of the first-order diffraction light along the second direction.

[0008] Optionally, the first shielding portion is a diffuse reflection portion or a light absorbing portion.

[0009] Optionally, the first light-transmissive portion is a through hole opened on the first shielding portion.

[0010] Optionally, the first shielding portion has a hollow structure, and the first light-transmitting portion is a light-transmitting member arranged at the hollow structure.

[0011] Optionally, the first shielding portion is a first cylindrical surface recessed on the first side wall, and an opening of the first cylindrical surface faces the accommodating cavity.

[0012] Optionally, the normal line of the section at the center point of the first cylindrical surface is parallel to the first-order diffraction light, and the central axis of the first light-transmitting portion is parallel to the first-order diffraction light.

[0013] Optionally, a second shielding portion and a second light-transmitting portion are provided near the second side wall of the shell, the second shielding portion is used to block the light beam incident from the output collimator side toward the input collimator side; the second light-transmitting portion is used to allow the laser beam emitted from the input collimator to pass through and then be incident on the acousto-optic crystal; the second side wall is the side wall of the accommodating cavity located between the acousto-optic crystal and the input collimator.

[0014] Optionally, the second shielding portion has a second cylindrical surface recessed on the second side wall, and an opening of the second cylindrical surface faces the accommodating cavity.

[0015] Optionally, the normal line of the section at the center point of the second cylindrical surface is parallel to the first-order diffraction light, and the central axis of the second light-transmitting portion is parallel to the first-order diffraction light.

[0016] Optionally, the fiber-coupled acousto-optic device further includes a first glass tube and a second glass tube, the input collimator is connected to the housing through the first glass tube, and the output collimator is connected to the housing through the second glass tube.

[0017] Another aspect of the present invention provides a fiber laser, which includes the above-mentioned fiber-coupled acousto-optic device.

[0018] The beneficial effects of the utility model include:

[0019] The fiber-coupled acousto-optic device provided in the present application includes a shell with a accommodating cavity, an acousto-optic crystal and a matching circuit board arranged in the accommodating cavity and along a first direction, a piezoelectric transducer arranged between the acousto-optic crystal and the matching circuit board, a radio frequency signal connector connected to the shell and located on the side of the matching circuit board away from the acousto-optic crystal, an input collimator and an output collimator connected to the shell and distributed on opposite sides of the acousto-optic crystal along a second direction; the first direction is perpendicular to the second direction; a first shielding portion and a first light-transmitting portion are provided near the first side wall of the shell, the first shielding portion has a first cylindrical surface recessed on the first side wall, and the opening of the first cylindrical surface faces the accommodating cavity, the first shielding portion is used to block zero-order diffraction light and / or second-order diffraction light from being incident on the output collimator; the first light-transmitting portion is used to allow the first-order diffraction light to pass through and then be incident on the output collimator; the first side wall is the side wall of the accommodating cavity located between the acousto-optic crystal and the output collimator. The present application arranges a first shielding portion and a first light-transmitting portion on the first side wall of the accommodating cavity, so that the first-order diffraction light can be transmitted from the first light-transmitting portion, while the zero-order diffraction light and / or the second-order diffraction light can be blocked by the first cylindrical surface of the first shielding portion. In this way, all or at least part of the zero-order diffraction light and the second-order diffraction light can be blocked to avoid hitting the output collimator. In this way, the risk of the output collimator of the fiber-coupled acousto-optic device being damaged by a high-energy laser when working at high optical power can be effectively avoided, and the optical power tolerance of the fiber-coupled acousto-optic device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 One of the structural schematic diagrams of the fiber-coupled acousto-optic device provided in some embodiments of the utility model;

[0022] Figure 2The second structural schematic diagram of the fiber-coupled acousto-optic device provided by some embodiments of the utility model;

[0023] Figure 3 The third structural schematic diagram of the fiber-coupled acousto-optic device provided by some embodiments of the utility model;

[0024] Figure 4 A fourth structural schematic diagram of a fiber-coupled acousto-optic device provided in some embodiments of the utility model;

[0025] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0026] Icons: 10-shell; 11-accommodating cavity; 111-first side wall; 112-second side wall; 20-acoustic-optic crystal; 30-matching circuit board; 40-RF signal connector; 50-input collimator; 60-output collimator; 71-first shielding part; 72-first light-transmitting part; 81-second shielding part; 82-second light-transmitting part; 91-first glass tube; 92-second glass tube; a-first direction; b-second direction; 93-pad. DETAILED DESCRIPTION

[0027] The embodiments set forth below represent information necessary to enable those skilled in the art to practice the embodiments, and illustrate the best mode for practicing the embodiments. After reading the following description with reference to the accompanying drawings, those skilled in the art will understand the concepts of the present invention, and will recognize the applications of these concepts not specifically proposed herein. It should be understood that these concepts and applications are within the scope of the present invention and the appended claims.

[0028] It should be understood that although the terms first, second, etc. can be used to describe various elements in this article, these elements should not be limited by these terms. These terms are only used to divide an element from another element. For example, without departing from the scope of the present invention, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] It should be understood that when an element (such as a layer, region or substrate) is referred to as "on another element" or "extending onto another element", it can be directly on another element or directly extended onto another element, or there can also be an intervening element. On the contrary, when an element is referred to as "directly on another element" or "directly extending onto another element", there is no intervening element. Similarly, it should be understood that when an element (such as a layer, region or substrate) is referred to as "on another element" or "extending onto another element", it can be directly on another element or directly extended onto another element, or there can also be an intervening element. On the contrary, when an element is referred to as "directly on another element" or "extending directly onto another element", there is no intervening element. It should also be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to another element, or there can be an intervening element. On the contrary, when an element is referred to as "directly connected" or "directly coupled" to another element, there is no intervening element.

[0030] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe the relationship of one element, layer or region to another element, layer or region as shown in the figures. It should be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.

[0031] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to limit the utility model. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" are intended to include the plural forms as well. It should also be understood that when used herein, the term "comprising" indicates the presence of the features, integers, steps, operations, elements and / or parts, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups of the above.

[0032] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which the utility model belongs. It should also be understood that the terms used in this article should be interpreted as having the same meaning as they do in this specification and the relevant field, and should not be interpreted in an idealized or overly formal sense, unless clearly defined in this article.

[0033] This embodiment provides a fiber laser, which includes a fiber-coupled acousto-optic device. The fiber-coupled acousto-optic device is mainly used for laser pulse modulation, pulse selection, optical frequency shifting, etc.

[0034] Please refer to Figure 1 and Figure 2 The above-mentioned fiber-coupled acousto-optic device includes a housing 10 having an accommodating cavity 11, an acousto-optic crystal 20 and a matching circuit board 30 arranged in the accommodating cavity 11 and arranged along a first direction a, a piezoelectric transducer arranged between the acousto-optic crystal 20 and the matching circuit board 30, a radio frequency signal connector 40 connected to the housing 10 and located on a side of the matching circuit board 30 away from the acousto-optic crystal 20, an input collimator 50 and an output collimator 60 connected to the housing 10 and distributed on opposite sides of the acousto-optic crystal 20 along a second direction b; the first direction a and the second direction b vertical; the housing 10 is provided with a first shielding portion 71 and a first light-transmitting portion 72 near the first side wall 111, the first shielding portion 71 has a first cylindrical surface recessed on the first side wall 111, and the opening of the first cylindrical surface faces the accommodating cavity 11, the first shielding portion 71 is used to block the zero-order diffraction light and / or the second-order diffraction light from being incident on the output collimator 60; the first light-transmitting portion 72 is used to allow the first-order diffraction light to pass through and then be incident on the output collimator 60; the first side wall 111 is the side wall of the accommodating cavity 11 located between the acousto-optic crystal 20 and the output collimator 60. The fiber-coupled acousto-optic device can improve the optical power bearing capacity.

[0035] It should be noted that the housing 10 is provided with a receiving cavity 11, which can be referred to as Figure 1 and Figure 2 As shown, the acousto-optic crystal 20 , the matching circuit board 30 and the piezoelectric transducer (not shown) are all disposed in the accommodating cavity 11 , and the piezoelectric transducer is disposed on a side of the acousto-optic crystal 20 close to the matching circuit board 30 .

[0036] In this embodiment, the acousto-optic crystal 20 may be disposed on the pad 93 so that the acousto-optic crystal 20 corresponds to the matching circuit board 30 and may correspond to the input collimator 50 and the output collimator 60 respectively.

[0037] The fiber-coupled acousto-optic device works on the principle of acoustic-optic interaction. Its working principle is that the driving power source outputs the radio frequency signal through the radio frequency signal connector 40, and the radio frequency signal is loaded onto the piezoelectric transducer through the matching circuit, thereby exciting the ultrasonic wave of the same frequency to enter the acousto-optic crystal 20. The ultrasonic wave periodically modulates the optical refractive index of the acousto-optic crystal 20 to form an equivalent phase grating. The grating spacing is equal to the wavelength of the ultrasonic wave. When the laser beam is incident on the acousto-optic crystal 20 from the input collimator 50 at a certain angle, the laser beam will diffract, and the first-order diffracted light after diffraction will be output through the output collimator 60. This is the interaction phenomenon between sound waves and light waves, that is, the acousto-optic effect.

[0038] In this embodiment, the accommodating cavity 11 provided on the housing 10 has a first side wall 111, and the first side wall 111 is a side wall of the accommodating cavity 11 located between the acousto-optic crystal 20 and the output collimator 60. Figure 1 .

[0039] The housing 10 is provided with a first shielding portion 71 and a first light-transmitting portion 72 near the first side wall 111, wherein the first shielding portion 71 is used to shield the zero-order diffracted light and / or the second-order diffracted light. Figure 4 and Figure 5 In this embodiment, the first shielding portion 71 has a first cylindrical surface recessed on the first side wall 111, and the opening of the first cylindrical surface faces the accommodating cavity 11. After adopting the cylindrical surface, if the first shielding portion 71 adopts the diffuse reflection principle to achieve the shielding of the zero-order diffraction light and the second-order diffraction light, the diffuse reflection effect is better, which can further effectively improve the shielding effect of the zero-order diffraction light and the second-order diffraction light.

[0040] It should be noted that the first shielding portion 71 shields the zero-order diffraction light and / or the second-order diffraction light, which means shielding the zero-order diffraction light and / or the second-order diffraction light from being incident on the output collimator 60, thereby preventing the zero-order diffraction light and / or the second-order diffraction light from hitting and damaging the output collimator 60.

[0041] In this embodiment, it is preferred that the first shielding portion 71 can block the zero-order diffraction light. On this basis, it is more preferred that the first shielding portion 71 can block the second-order diffraction light in addition to the zero-order diffraction light, so that the laser can be more effectively prevented from damaging the output collimator 60.

[0042] In addition, it should be noted that the shielding of the zero-order diffraction light and the second-order diffraction light by the first shielding portion 71 can be achieved by causing the zero-order diffraction light and the second-order diffraction light to be diffusely reflected or absorbed at the first shielding portion 71, that is, optionally, the first shielding portion 71 is a diffuse reflection portion or a light absorption portion.

[0043] The first light-transmitting portion 72 is used for allowing the first-order diffracted light to pass through. In this embodiment, the second-order diffracted light and the zero-order diffracted light cannot pass through the first light-transmitting portion 72. The setting region and area of ​​the first light-transmitting portion 72 are not specifically limited in this application, as long as the first light-transmitting portion 72 can pass through the first-order diffracted light and prevent the zero-order diffracted light and the second-order diffracted light from passing through, and the setting position and setting area of ​​the first light-transmitting portion 72 can be selected according to the principle that the first-order diffracted light has different emission angles from the zero-order diffracted light and the second-order diffracted light.

[0044] The first light-transmitting portion 72 is to allow the first-order diffracted light to pass through. In this embodiment, the following method can be used to achieve this:

[0045] For example, optionally, in a first feasible implementation manner, the first light-transmitting portion 72 is a through hole opened on the first shielding portion 71, such as Figure 1 , Figure 4 and Figure 5 The through hole is arranged at the light exiting side of the first-order diffracted light, so that the first-order diffracted light can pass through it and be incident on the output collimator 60 .

[0046] For another example, in a second feasible implementation, the first shielding portion 71 has a hollow structure, and the first light-transmitting portion 72 is a light-transmitting member disposed at the hollow structure. In other words, in addition to being a through hole formed by digging a hole on the first shielding portion 71, the first light-transmitting portion 72 can also be a separately disposed light-transmitting member for transmitting the first-order diffracted light.

[0047] In addition, it should be noted that the first light-transmitting portion 72 may be located in the middle area of ​​the first shielding portion 71. Figure 5 As shown; it can also be located on one side of the first shielding portion 71.

[0048] In summary, the fiber-coupled acousto-optic device provided in the present application includes a housing 10 having an accommodating cavity 11, an acousto-optic crystal 20 and a matching circuit board 30 disposed in the accommodating cavity 11 and arranged along a first direction a, a piezoelectric transducer disposed between the acousto-optic crystal 20 and the matching circuit board 30, a radio frequency signal connector 40 connected to the housing 10 and located on a side of the matching circuit board 30 away from the acousto-optic crystal 20, an input collimator 50 and an output collimator 60 connected to the housing 10 and distributed on opposite sides of the acousto-optic crystal 20 along a second direction b; the first direction a and The second direction b is perpendicular; a first shielding portion 71 and a first light-transmitting portion 72 are provided near the first side wall 111 of the shell 10, the first shielding portion 71 has a first cylindrical surface recessed on the first side wall 111, and the opening of the first cylindrical surface faces the accommodating cavity 11, the first shielding portion 71 is used to block the zero-order diffraction light and / or the second-order diffraction light from being incident on the output collimator 60; the first light-transmitting portion 72 is used to allow the first-order diffraction light to pass through and then be incident on the output collimator 60; the first side wall 111 is the side wall of the accommodating cavity 11 located between the acousto-optic crystal 20 and the output collimator 60. The present application arranges a first shielding portion 71 and a first light-transmitting portion 72 on the first side wall 111 of the accommodating cavity 11, so that the first-order diffraction light can be transmitted from the first light-transmitting portion 72, while the zero-order diffraction light and / or the second-order diffraction light can be blocked by the first cylindrical surface of the first shielding portion 71. In this way, all or at least part of the zero-order diffraction light and the second-order diffraction light can be blocked to avoid hitting the output collimator 60. In this way, the risk of the output collimator 60 being damaged by the high-energy laser when the fiber-coupled acousto-optic device is working at high optical power can be effectively avoided, and the optical power tolerance of the fiber-coupled acousto-optic device can be improved.

[0049] The fiber-coupled acousto-optic device provided in the present application can improve the light-bearing capacity. Compared with the prior art which can only bear 3W to 5W of light power during operation, after adopting the fiber-coupled acousto-optic device of the present application, it has been experimentally verified that the light-bearing power can reach an average power of 15W, which is obviously better.

[0050] In order to achieve a better shielding effect and ensure that the normal output of the first-order diffraction light is not affected, optionally, the normal of the section at the center point of the first cylindrical surface is parallel to the first-order diffraction light, and the central axis of the first light-transmitting portion 72 is parallel to the first-order diffraction light.

[0051] Optionally, the orthographic projection area of ​​the first light-transmitting portion 72 along the second direction b is between 1.5 and 2.5 times the orthographic projection area of ​​the first-order diffraction light exit spot along the second direction b. In short, the area of ​​the first light-transmitting portion 72 is 1.5 to 2.5 times the area of ​​the first-order diffraction light exit spot. For example, the area of ​​the first light-transmitting portion 72 is equal to 1.5 times, 2 times, or 2.5 times the area of ​​the first-order diffraction light exit spot.

[0052] Since the optical path is reversible, in order to avoid the reflected light from damaging the input collimator 50, please refer to Figure 2 Optionally, the shell 10 is provided with a second shielding portion 81 and a second light-transmitting portion 82 near the second side wall 112, the second shielding portion 81 is used to block the light beam incident from the output collimator 60 side toward the input collimator 50 side; the second light-transmitting portion 82 is used to allow the laser beam emitted from the input collimator 50 to pass through and then be incident on the acousto-optic crystal 20; the second side wall 112 is the side wall of the accommodating cavity 11 located between the acousto-optic crystal 20 and the input collimator 50.

[0053] The second shielding portion 81 is used to block the light beam reflected from the output collimator 60 side toward the input collimator 50 side (that is, the light beam incident from the output collimator 60 side toward the input collimator 50 side). The second light-transmitting portion 82 is used to allow the laser beam emitted from the input collimator 50 to pass through and then be incident on the acousto-optic crystal 20. In this way, the setting of the second shielding portion 81 can prevent the reflected light beam from damaging the input collimator 50, and the setting of the second light-transmitting portion 82 can allow the light beam from the input collimator 50 to be normally incident on the acousto-optic crystal 20.

[0054] Optionally, the second shielding portion 81 has a second cylindrical surface recessed on the second side wall 112, and the opening of the second cylindrical surface faces the accommodating cavity 11. The second cylindrical surface is also provided to achieve a better diffuse reflection effect.

[0055] Optionally, the normal of the section at the center point of the second cylindrical surface is parallel to the first-order diffracted light, and the central axis of the second light-transmitting portion 82 is parallel to the first-order diffracted light. This setting is also to make the shielding effect of the second shielding portion 81 and the light transmission effect of the second light-transmitting portion 82 better.

[0056] In addition, the second shielding portion 81 may also be a light absorbing portion or a diffuse reflecting portion; the second light transmitting portion 82 may also be a light transmitting member or a through hole. It should be noted that the arrangement position, the orthographic projection area and the type of the second shielding portion 81 and the second light transmitting portion 82 along the second direction b may all refer to the first shielding portion 71 and the first light transmitting portion 72 in the above text, and the same parts will not be repeated in this application.

[0057] Please refer to Figure 3 and Figure 4 Optionally, the fiber-coupled acousto-optic device further includes a first glass tube 91 and a second glass tube 92 , the input collimator 50 is connected to the housing 10 through the first glass tube 91 , and the output collimator 60 is connected to the housing 10 through the second glass tube 92 .

[0058] The first glass tube 91 is used to connect the housing 10 and the input collimator 50, and the second glass tube 92 is used to connect the housing 10 and the output collimator 60. In addition, the gaps between the two glass tubes and the housing 10 can be filled with glue.

[0059] In addition, in order to achieve a better shielding effect of the first shielding portion 71, the orthographic projection of the first shielding portion 71 along the second direction b (such as Figure 5 As shown, the orthographic projection of the first shielding portion 71 from left to right) can completely cover the output collimator 60 and the glue used to fill the second glass tube 92 and the housing 10; and the orthographic projection of the second shielding portion 81 along the reverse second direction b (as shown Figure 5 As shown, the first shielding portion 71 (orthographic projection from right to left) can completely cover the input collimator 50 and the glue used to fill the first glass tube 91 and the housing 10. In this way, the two shielding portions can not only prevent the light beam from damaging the output collimator 60 and the input collimator 50, but also avoid damage to the glue filling the second glass tube 92 and the housing 10, and the glue filling the first glass tube 91 and the housing 10.

[0060] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A fiber-coupled acousto-optic device, characterized in that: The invention comprises a shell having an accommodating cavity, an acousto-optic crystal and a matching circuit board arranged in the accommodating cavity and arranged along a first direction, a piezoelectric transducer arranged between the acousto-optic crystal and the matching circuit board, a radio frequency signal connector connected to the shell and located on a side of the matching circuit board away from the acousto-optic crystal, and an input collimator and an output collimator connected to the shell and distributed on opposite sides of the acousto-optic crystal along a second direction; the first direction is perpendicular to the second direction; The shell is provided with a first shielding portion and a first light-transmitting portion near the first side wall, the first shielding portion has a first cylindrical surface recessed on the first side wall, and the opening of the first cylindrical surface faces the accommodating cavity, the first shielding portion is used to block the zero-order diffraction light and / or the second-order diffraction light from being incident on the output collimator; the first light-transmitting portion is used to allow the first-order diffraction light to pass through and then be incident on the output collimator; the first side wall is the side wall of the accommodating cavity located between the acousto-optic crystal and the output collimator.

2. The fiber-coupled acousto-optic device according to claim 1, characterized in that: An orthographic projection area of ​​the first light-transmitting portion along the second direction is between 1.5 times and 2.5 times an orthographic projection area of ​​an exit light spot of the first-order diffraction light along the second direction.

3. The fiber-coupled acousto-optic device according to claim 1, characterized in that: The first shielding portion is a diffuse reflection portion or a light absorption portion.

4. The fiber-coupled acousto-optic device according to any one of claims 1 to 3, characterized in that: The first light-transmitting portion is a through hole opened on the first shielding portion; Alternatively, the first shielding portion has a hollow structure, and the first light-transmitting portion is a light-transmitting member disposed at the hollow structure.

5. The fiber-coupled acousto-optic device according to claim 1, characterized in that: The normal line of the section at the center point of the first cylindrical surface is parallel to the first-order diffraction light, and the central axis of the first light-transmitting portion is parallel to the first-order diffraction light.

6. The fiber-coupled acousto-optic device according to claim 1, wherein: The shell is provided with a second shielding portion and a second light-transmitting portion near the second side wall, the second shielding portion is used to block the light beam incident from the output collimator side toward the input collimator side; the second light-transmitting portion is used to allow the laser beam emitted from the input collimator to pass through and then be incident on the acousto-optic crystal; the second side wall is the side wall of the accommodating cavity located between the acousto-optic crystal and the input collimator.

7. The fiber-coupled acousto-optic device according to claim 6, characterized in that: The second shielding portion has a second columnar surface concavely disposed on the second side wall, and an opening of the second columnar surface faces the accommodating cavity.

8. The fiber-coupled acousto-optic device according to claim 7, characterized in that: The normal line of the section at the center point of the second cylindrical surface is parallel to the first-order diffraction light, and the central axis of the second light-transmitting portion is parallel to the first-order diffraction light.

9. The fiber-coupled acousto-optic device according to claim 1, characterized in that: The fiber-coupled acousto-optic device further includes a first glass tube and a second glass tube. The input collimator is connected to the housing through the first glass tube, and the output collimator is connected to the housing through the second glass tube.

10. A fiber laser, characterized in that: A fiber-coupled acousto-optic device comprising any one of claims 1 to 9.

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