Adjustable beam expander device and spectrograph

Abstract

The invention discloses an adjustable beam expander device, and belongs to the technical field of laser adjusting devices. By changing the position of the trapezoidal reflecting mirror, the trapezoidal reflecting mirror can fold the light path, the system size is reduced, meanwhile, the translation of the trapezoidal reflecting mirror can synchronously compensate the optical axis deviation caused by the change of the distance between the lenses, and the light beam collimation is maintained. In addition, due to the collaborative design of the trapezoidal reflector and the concave / convex lens, the sensitivity to mechanical errors can be reduced, and light path offset is adjusted and compensated through closed-loop feedback of the trapezoidal reflector.

Description

Technical Field

[0001] The present application relates to the technical field of laser adjustment devices, and in particular to an adjustable beam expander device and a spectrometer. Background Art

[0002] Lasers, with their strong collimation, have been widely used in many industries in the national economy. Lasers are parallel light with a divergence angle, so the laser spot size increases and the energy per unit area decreases when emitted at a long distance. To change the laser spot size at a specific location, the laser divergence angle must be adjusted. Therefore, laser beam expanders are designed into the laser emission optical path. Beam expanders are typically used to change the diameter and divergence angle of the laser beam.

[0003] Currently, beam expanders mostly adjust the divergence angle and expansion ratio of the light beam by changing the distance between the concave lens and the convex lens, which results in a larger volume of the beam expander and, in turn, poor flexibility in use in some devices with smaller internal spaces (e.g., spectrometers). Summary of the Invention

[0004] The present invention provides an adjustable beam expander device and a spectrometer. This solves the problem of large beam expanders in the prior art. The technical solution is as follows:

[0005] In one aspect, an adjustable beam expander device is provided, comprising:

[0006] Mirror mount, concave lens, translation adjustment member, trapezoidal reflector and convex lens;

[0007] The concave lens and the convex lens are both fixed on the lens base and arranged opposite to each other along a first direction;

[0008] The translation adjustment member is mounted on the mirror base, the trapezoidal reflector is fixed on the top of the translation adjustment member and is located between the concave lens and the convex lens, and the two oppositely arranged light-guiding inclined surfaces of the trapezoidal reflector face the concave lens and the convex lens respectively;

[0009] The translation adjustment member is configured to drive the trapezoidal reflector to move along the first direction to adjust the distance between the reflector and the light exit surface of the concave lens and the light incident surface of the convex lens.

[0010] Optionally, the translation adjustment member includes: a stepper motor, a transmission component and a translation adjustment seat, the stepper motor is mounted on the mirror seat and the output shaft is in transmission connection with the transmission component, the translation adjustment seat is slidably mounted on the mirror seat and is tightly connected to the transmission component, and the bottom of the trapezoidal reflector is fixed to the top of the translation adjustment seat;

[0011] Wherein, the stepper motor is configured to: drive the translation adjustment seat and the trapezoidal reflector to move synchronously along the first direction through the transmission component.

[0012] Optionally, the adjustable beam expander device further comprises: a position-limiting photoelectric sensor, a sensor plate, and a PLC controller, wherein the position-limiting photoelectric sensor is fixed on the mirror seat, and the sensor plate is fixed on the translation adjustment seat and moves synchronously with the trapezoidal reflector;

[0013] The limit photoelectric sensor and the stepping motor are both electrically connected to the PLC controller.

[0014] Optionally, the transmission component includes: a transmission gear and a transmission rack that cooperate with each other, the transmission gear is synchronously connected to the output shaft of the stepping motor, and the transmission rack extends along the first direction and is firmly connected to the translation adjustment seat.

[0015] Optionally, the translation adjustment seat has a first guide member, and the mirror seat has a second guide member that cooperates with the first guide member;

[0016] Wherein, the first guide member and the second guide member both extend along the first direction.

[0017] Optionally, the first guide member is a first guide slot extending along the first direction, and the second guide member is a second guide slot extending along the first direction; the adjustable collimator device also includes: a plurality of balls slidably installed between the first guide slot and the second guide slot.

[0018] Optionally, the translation adjustment seat is further configured to: drive the trapezoidal reflector to move along a second direction, where the second direction is perpendicular to the first direction and perpendicular to two oppositely arranged side surfaces of the trapezoidal reflector.

[0019] Optionally, the mirror base includes: a bottom plate and two relatively parallel side plates, the two side plates being fixedly connected to two edges of the base respectively;

[0020] Wherein, the two side plates respectively have mounting holes for mounting the concave lens and the convex lens.

[0021] On the other hand, a spectrometer is provided, which includes: a laser and an adjustable beam expander device, wherein the light emitted by the laser is directed to a concave lens in the adjustable beam expander device; wherein the adjustable beam expander device is any one of the adjustable beam expander devices given above.

[0022] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0023] By changing the position of the trapezoidal reflector, the reflector can be used to fold the optical path and reduce system size. Simultaneously, the translation of the reflector can simultaneously compensate for optical axis deviation caused by changes in lens spacing, maintaining beam collimation. Furthermore, the coordinated design of the reflector and concave / convex lenses reduces sensitivity to mechanical errors, and optical path deviation is compensated through closed-loop feedback adjustment of the reflector. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 Schematic diagram of the structure of an adjustable beam expander device provided in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 A front view of the adjustable beam expander device is shown;

[0027] Figure 3 yes Figure 1 A top view of the adjustable beam expander device is shown;

[0028] Figure 4 This is a partial structural diagram of an adjustable beam expander device provided in an embodiment of the present application;

[0029] Figure 5 This is a partial exploded schematic diagram of the structure of an adjustable beam expander device provided in an embodiment of the present application;

[0030] Figure 6 This is a schematic structural diagram of another adjustable beam expander device provided in an embodiment of the present application.

[0031] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 : is a structural diagram of an adjustable beam expander device provided in an embodiment of the present application, Figure 2 yes Figure 1 The front view of the adjustable beam expander device is shown. Figure 3 yes Figure 1 The adjustable beam expander device may include: a lens holder 100 , a concave lens 200 , a translation adjustment member 300 , a trapezoidal reflector 400 and a convex lens 500 .

[0036] The concave lens 200 and the convex lens 500 in the adjustable beam expander device can both be fixed on the lens base 100 and arranged opposite to each other along the first direction f1.

[0037] The translation adjustment member 300 in the adjustable beam expander device can be mounted on the lens holder 100. The bottom surface of the trapezoidal reflector 400 can be fixed to the top of the translation adjustment member 300 and located between the concave lens 200 and the convex lens 500. The two oppositely disposed light-guiding inclined surfaces m1 in the trapezoidal reflector 400 can face the concave lens 200 and the convex lens 500, respectively. Here, the bottom of the trapezoidal reflector 400 can be coated with a reflective film to ensure the reflection effect of the light beam entering the trapezoidal reflector 400.

[0038] The translation adjustment member 300 may be configured to drive the trapezoidal reflector 400 to move along the first direction f1 to adjust the distance between the light emitting surface of the concave lens 200 and the light incident surface of the convex lens 500 .

[0039] In an embodiment of the present application, the concave lens 200 is used to receive the initial laser beam and generate a divergent beam; the convex lens 500 is used to receive the divergent beam and output a collimated or focused beam; the reflective surface in the trapezoidal reflector 400 is coupled to the optical path of the concave lens 200 and the convex lens 500, and by synchronously adjusting the spacing between the trapezoidal reflector 400 and the concave / convex lens, the beam propagation path is changed to achieve dynamic adjustment of the beam expansion ratio. By changing the position of the trapezoidal reflector 400, the trapezoidal reflector 400 can fold the optical path and reduce the system volume. At the same time, the translation of the trapezoidal reflector 400 can synchronously compensate for the optical axis offset caused by the change in lens spacing, maintaining the collimation of the beam. In addition, the coordinated design of the trapezoidal reflector 400 and the concave / convex lens can reduce the sensitivity to mechanical errors, and the optical path offset can be compensated by adjusting the movement of the trapezoidal reflector 400.

[0040] For example, the trapezoidal reflector 400 may have two opposing light-guiding inclined surfaces m1 and a light-guiding bottom surface m2 disposed between the two light-guiding inclined surfaces m1. A light beam incident on one light-guiding inclined surface after passing through the concave lens 200 is refracted and then incident on the light-guiding bottom surface m2. Thereafter, the light beam is totally reflected by the light-guiding bottom surface m2 and then incident on the other light-guiding inclined surface, where it is collimated or focused.

[0041] In summary, the embodiments of the present application provide an adjustable beam expander device, which may include: a mirror mount, a concave lens, a translation adjustment member, a trapezoidal reflector, and a convex lens. By changing the position of the trapezoidal reflector, the trapezoidal reflector can fold the optical path and reduce the system volume. At the same time, the translation of the trapezoidal reflector can synchronously compensate for the optical axis offset caused by the change in lens spacing, maintaining the collimation of the light beam. In addition, the coordinated design of the trapezoidal reflector and the concave / convex lens can reduce sensitivity to mechanical errors, and the closed-loop feedback adjustment of the trapezoidal reflector can compensate for the optical path offset.

[0042] Optional, please refer to Figure 4 , Figure 4 : This is a partial structural diagram of an adjustable collimator device provided in an embodiment of the present application. The translation adjustment member 300 in the adjustable collimator device may include: a stepper motor 301, a transmission component 302, and a translation adjustment seat 303. The stepper motor 301 may be mounted on the mirror base 100 and its output shaft may be transmission-connected to the transmission component 302. The translation adjustment seat 303 is slidably mounted on the mirror base 100 and may be fastened to the transmission component 302. The bottom of the trapezoidal reflector 400 may be fixed to the top of the translation adjustment seat 303. The stepper motor 301 may be configured to drive the translation adjustment seat 303 and the trapezoidal reflector 400 to move synchronously along the first direction f1 through the transmission component 302. In this case, by arranging the stepper motor 301 and the transmission component 302 that cooperate with each other in transmission in the translation adjustment member 300, the driving accuracy of the trapezoidal reflector 400 is improved.

[0043] For examples, please refer to Figure 5 , Figure 5 1 is an exploded schematic diagram of a partial structure of an adjustable collimator device provided in an embodiment of the present application. The translation adjustment seat 303 may have a first guide member 303a, and the mirror seat 100 may have a second guide member 101 that cooperates with the first guide member 303a. The first guide member 303a and the second guide member 101 may both be extended along the first direction f1. In this case, by providing the first guide member 303a and the second guide member 101, the movement accuracy of the translation adjustment seat 300 is effectively improved, thereby improving the movement accuracy of the trapezoidal reflector 400 and reducing the probability of optical axis offset. For example, the first guide member 303a and the second guide member 101 can be two groups.

[0044] For example, Figure 5 As shown, the first guide member 303a may be a first guide slot C1 extending along the first direction f1, and the second guide member 101 may be a second guide slot C2 extending along the first direction f1. The adjustable beam expander device may further include: a plurality of balls 600 slidably mounted between the first guide slot C1 and the second guide slot C2. Thus, the cooperation between the two guide slots and the balls ensures stable movement of the translation adjustment base 300, thereby ensuring stable movement of the trapezoidal reflector 400.

[0045] In the embodiments of this application, Figure 4 As shown, the adjustable collimator device can also include: a limit photoelectric sensor 700, a sensor plate 800 and a PLC controller (not shown in the figure), the limit photoelectric sensor 700 can be fixed on the mirror base 100, and the sensor plate 800 can be fixed on the translation adjustment base 303 and can move synchronously with the trapezoidal reflector 400. Among them, the limit photoelectric sensor 700 and the stepper motor 301 can be electrically connected to the PLC controller. In this way, the displacement adjustment of the trapezoidal reflector 400 is driven by the stepper motor 301, and combined with the feedback of the limit photoelectric sensor 700, high-precision control can be achieved. For example, when the sensor plate 800 moves to coincide with the limit photoelectric sensor 700, it can be set to the origin position. During the calibration process of the adjustable collimator device, the origin position is used as a reference, and a drive instruction is sent to the stepper motor through the PLC controller to control the action of the drive motor. Additionally, during the movement of the translation adjustment base, when the limit photoelectric sensor and the sensing plate coincide, a command is sent to the PLC controller, which then controls the stepper motor to stop. When the power is turned on again after a power outage, the stepper motor first drives the translation adjustment base until the limit photoelectric sensor and the sensing plate coincide, and then drives the translation adjustment base to the preset calibration position.

[0046] Optional, such as Figure 4As shown, the transmission component 302 in the translation adjustment member 300 may include a transmission gear 302a and a transmission rack 302b that cooperate with each other. The transmission gear 302a can be synchronously connected to the output shaft of the stepping motor 301, and the transmission rack 302b can extend along the first direction f1 and be tightly connected to the translation adjustment base 303. In this way, the cooperation between the transmission gear 302a and the transmission rack 302b effectively ensures the stable movement of the translation adjustment base 303, thereby ensuring the stable movement of the trapezoidal reflector 400.

[0047] In the embodiments of this application, Figure 4 As shown, the translation adjustment seat 303 can also be configured to drive the trapezoidal reflector 400 to move along a second direction f2, where the second direction f2 can be perpendicular to the first direction f1 and perpendicular to two relatively parallel side surfaces m3 of the trapezoidal reflector 400. In this way, during the assembly process, the position of the trapezoidal reflector 400 along the second direction f2 can be adjusted by the translation adjustment seat 303 to ensure the relative overlapping position of the trapezoidal reflector 400, the concave lens 200, and the convex lens 500 along the first direction f1, so that the trapezoidal reflector 400 can receive as much light beam emitted from the concave lens 20 as possible. For example, the translation adjustment seat 303 can be a translation fine-tuning slide, through which the trapezoidal reflector 400 can be manually moved and adjusted along the second direction.

[0048] Optional, please refer to Figure 6 , Figure 6 : is a structural schematic diagram of another adjustable collimator device provided in an embodiment of the present application. The mirror base 100 may include: a bottom plate 102 and two side plates 103 arranged relatively parallel to each other, and the two side plates 103 may be fixedly connected to the two edges of the base 102 respectively. Among them, the two side plates 103 may respectively have mounting holes k for mounting the concave lens 200 and the convex lens 500. In this way, the concave lens 200 and the convex lens 500 are respectively mounted in the mounting holes k in the two side plates 103, which further helps to reduce the volume of the adjustable collimator device. For example, the translation adjustment member 300 and the trapezoidal reflector 400 are mounted in the space enclosed by the two side plates 103 and the bottom plate 102.

[0049] An embodiment of the present application also provides a spectrometer, which may include: a laser (not shown in the figure) and an adjustable beam expander device, wherein the light beam emitted by the laser is directed to a concave lens in the adjustable beam expander device.

[0050] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0051] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An adjustable beam expander device, characterized in that: include: Mirror mount, concave lens, translation adjustment member, trapezoidal reflector and convex lens; The concave lens and the convex lens are both fixed on the lens base and arranged opposite to each other along a first direction; The translation adjustment member is mounted on the mirror base, the trapezoidal reflector is fixed on the top of the translation adjustment member and is located between the concave lens and the convex lens, and the two oppositely arranged light-guiding inclined surfaces of the trapezoidal reflector face the concave lens and the convex lens respectively; The translation adjustment member is configured to drive the trapezoidal reflector to move along the first direction to adjust the distance between the reflector and the light exit surface of the concave lens and the light incident surface of the convex lens.

2. The adjustable beam expander device according to claim 1, wherein: The translation adjustment member includes: a stepper motor, a transmission component and a translation adjustment seat, the stepper motor is mounted on the mirror seat and its output shaft is in transmission connection with the transmission component, the translation adjustment seat is slidably mounted on the mirror seat and is tightly connected to the transmission component, and the bottom of the trapezoidal reflector is fixed to the top of the translation adjustment seat; Wherein, the stepper motor is configured to: drive the translation adjustment seat and the trapezoidal reflector to move synchronously along the first direction through the transmission component.

3. The adjustable beam expander device according to claim 2, characterized in that: The adjustable beam expander device further comprises: a position-limiting photoelectric sensor, a sensor plate, and a PLC controller, wherein the position-limiting photoelectric sensor is fixed on the mirror seat, and the sensor plate is fixed on the translation adjustment seat and moves synchronously with the trapezoidal reflector; Wherein, the limit photoelectric sensor and the stepping motor are both electrically connected to the PLC controller.

4. The adjustable beam expander device according to claim 2, wherein: The transmission component includes: a transmission gear and a transmission rack that cooperate with each other, the transmission gear is synchronously connected to the output shaft of the stepping motor, and the transmission rack extends along a first direction and is tightly connected to the translation adjustment seat.

5. The adjustable beam expander device according to claim 2, wherein: The translation adjustment seat has a first guide member, and the mirror seat has a second guide member that cooperates with the first guide member; Wherein, the first guide member and the second guide member are both extended along the first direction.

6. The adjustable beam expander device according to claim 5, characterized in that: The first guide member is a first guide slot extending along the first direction, and the second guide member is a second guide slot extending along the first direction; The adjustable beam expander device further comprises: a plurality of balls slidably mounted between the first guide slot and the second guide slot.

7. The adjustable beam expander device according to claim 2, wherein: The translation adjustment seat is further configured to drive the trapezoidal reflector to move along a second direction, wherein the second direction is perpendicular to the first direction and perpendicular to two relatively parallel side surfaces of the trapezoidal reflector.

8. The adjustable beam expander device according to any one of claims 1 to 7, characterized in that: The mirror base comprises: a bottom plate and two side plates arranged relatively parallel to each other, wherein the two side plates are respectively fixedly connected to two edges of the base; Wherein, the two side plates respectively have mounting holes for mounting the concave lens and the convex lens.

9. A spectrometer, characterized in that: include: A laser and an adjustable beam expander device as described in any one of claims 1 to 8, wherein the light beam emitted by the laser is directed to a concave lens in the adjustable beam expander device.

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