CN221126528U - Multipath laser and laser system - Google Patents

Abstract

The utility model discloses a multipath laser and a laser system. The multi-path laser comprises a laser unit, a motor, a first reflecting mirror and a second reflecting mirror, wherein the laser unit is used for generating laser, the motor is used for driving the first reflecting mirror to rotate together with the second reflecting mirror, and the first reflecting mirror and the second reflecting mirror are kept parallel in the rotation process of the first reflecting mirror and the second reflecting mirror, and the laser excited by the laser unit is incident on the first reflecting mirror, and reaches the second reflecting mirror to be reflected out after being reflected by the first reflecting mirror. According to the scheme, the first reflecting mirror and the second reflecting mirror synchronously rotate and are arranged in parallel, so that offset brought in the rotation process of the motor in one pulse period is eliminated, laser reflected by the second reflecting mirror in the rotation process is ensured to be parallel, and the laser is conveniently focused in the optical fiber by using the lens.

Description

Multipath laser and laser system

Technical Field

The application belongs to the field of lasers, and particularly relates to a multipath laser and a laser system.

Background

Laser light in urology surgery, most commonly pulsed holmium laser light. In the surgical process, energy generated by the laser is transferred to the calculus through a water evaporation process, so that the calculus is crushed until the calculus is powdered. Typically, a pulsed laser uses the average power as a characteristic parameter, and at the same peak power, the average power is proportional to the product of pulse width and frequency. The longer the pulse width, the higher the frequency, the larger the average power, and the better the stone powdering effect.

Limited by the material properties, the light output frequency of a single laser is typically no more than 25Hz. In order to obtain a higher light output frequency, such as 100Hz, several lasers need to be combined into a multi-path laser system to achieve a high frequency condition in a time-division light output manner. For example, four lasers are combined into a four-way laser system, and the light-emitting frequency of 100Hz can be obtained.

For a multi-path laser system, as described in chinese patent publication No. CN204577829U, the specific drawing can be seen in fig. 1 and 2, where the reflecting mirror 30 reflects the corresponding laser beam onto the surface of the reflecting mirror 40, and the reflecting mirror 40 outputs the laser beam. The reflecting mirror 40 is fixed on the motor shaft in an inclined manner and rotates at a constant speed along with the motor. The mirror 30 remains stationary. During rotation, the reflecting mirror 30 is controlled by a precise circuit to make pulse laser beams of different lasers incident on the surface of the reflecting mirror 40 in a time-sharing manner.

In the ideal light emitting state, the normal lines of the reflecting mirror 40 and the corresponding reflecting mirror 30 are always parallel to each other, and the reflected light of the reflecting mirror 40 is always transmitted along the central axis of the system, so that the effect of 'same direction and common path' is realized. After focusing through the lens, coupling into the fiber.

However, in the case of real light emission, the motor rotates through a small angle α in one pulse period because the rotation of the motor is continuous and the pulse width of the pulsed laser is a finite value other than zero. This small angle is proportional to the product of the pulse width T and the motor rotation frequency f: α=f×t×360°. Since the reflecting mirror 40 is fixed on the motor shaft, when the motor rotates, the normal line of the reflecting mirror 40 is converted into a conical surface in space, and the vertex angle θ of the conical surface exactly corresponds to the inclination angle of the reflecting mirror 40, as shown in fig. 1. When the motor rotates through an angle α, the normal M of the mirror 40 rotates through an angle β in space, which is determined by α and θ together: β=2×asin (sin (θ) ×sin (α/2)). The result of this angle beta is that the normals of mirrors 40 and 30 are not always parallel during a pulse period, and both are at most at an angle beta, at which time the reflected light of mirror 40 is deflected by angle 2 beta. Further, the higher the light-emitting frequency, the faster the motor rotation speed, and the larger the above-mentioned deflection amount.

As shown in fig. 2, the solid line arrow and the broken line arrow represent a start pulse segment 31 and a stop pulse segment 32, respectively, of one pulse period (the start pulse segment may be understood as the foremost segment of one pulse, and the stop pulse segment may be understood as the rearmost segment of one pulse). The off-pulse segment 32 output by the mirror 40 produces an angular deflection 2β. After focusing by the lens 27, it is converted into a positional shift x: x=f×tan (2β), where F is the lens focal length. When the optical fiber 33 is disposed near the focal point of the lens 27, the incident positions of the start pulse segment 31 and the stop pulse segment 32 differ by x on the fiber end face, and both cannot be received by the core of the optical fiber 33 at the same time. This can cause the laser pulse to enter the fiber incompletely, resulting in energy loss and low optical power; while the portion of the optical energy that does not enter the core is susceptible to "thermal breakdown" of the connector. The conventional medical optical fiber has a very thin fiber core, is sensitive to beam deflection, and can generate larger energy loss and thermal breakdown even if the fiber core is slightly deflected.

Disclosure of utility model

The application provides a multipath laser and a laser system, laser output by the multipath laser is parallel and has no deflection, and the laser system has high energy utilization rate.

In a first aspect, the present disclosure provides a multi-path laser, including a laser unit, a motor, a first mirror and a second mirror, where the laser unit is configured to generate laser, the motor is configured to drive the first mirror to rotate with the second mirror, and in a rotation process of the first mirror and the second mirror, the first mirror and the second mirror keep parallel, where the laser excited by the laser unit is incident on the first mirror, passes through the first mirror, and reaches the second mirror to be reflected out again.

Optionally, the first mirror and the second mirror rotate around a first rotation axis, a projection of the first rotation axis on a vertical plane is located in a projection of the second mirror on the vertical plane, and the first mirror receives the laser light in the corresponding position by rotating around the first rotation axis.

Optionally, an optical path of the laser excited by the laser unit is parallel to the first rotation axis.

Optionally, the laser unit can excite multiple paths of laser, and the optical paths of the multiple paths of laser are rotationally symmetrical with the first rotation axis as a center.

Optionally, the laser unit includes a plurality of optical resonant cavities through which laser light is emitted.

Optionally, the first mirror and the second mirror are located on a support, and the motor rotates the support to rotate the first mirror and the second mirror together, wherein the center of gravity of the support is located on the first rotation axis.

Optionally, the normal line of the first reflecting mirror forms an angle of 45 degrees with the first rotation axis, and the normal line of the second reflecting mirror forms an angle of 45 degrees with the first rotation axis.

Optionally, the motor drives the first mirror and the second mirror to rotate together, and during rotation of the first mirror and the second mirror, the first mirror and the second mirror remain parallel, so that the laser light emitted from the second mirror is parallel.

In a second aspect, the present disclosure provides a laser system, including a lens, an optical fiber, and any of the multiple lasers described above, where laser light emitted by the multiple lasers is emitted into the optical fiber through the lens.

Optionally, the deflection angle of the laser on the lens is smaller than the input aperture angle of the optical fiber, wherein the optical fiber and the first rotation axis are positioned on the same straight line.

In some embodiments of the present disclosure, the first mirror and the second mirror are synchronously rotated and arranged in parallel, so as to eliminate the offset caused by the rotation of the motor, and ensure that the laser reflected by the second mirror in the rotation process is parallel, so that the laser is focused in the optical fiber by the lens.

Drawings

Fig. 1 is a diagram illustrating a laser beam deviation from a mirror in the prior art.

Fig. 2 is a diagram of the optical path of a laser in the prior art.

Fig. 3 is a schematic structural diagram of a multi-path laser of the present disclosure.

Fig. 4 is a cross-sectional view of a multiple laser of the present disclosure.

Fig. 5 is an optical path diagram of a multiple laser of the present disclosure.

S, a motor rotating shaft or a motor rotating shaft extending line; m, normal; r, laser; 101. a laser unit; 102. a condensing cavity; 103. a total reflection mirror; 104. a partial mirror; 202. a first mirror; 203. a second mirror; 204. a bracket; 205. a motor; 206. laser of the start pulse section, 207, laser of the stop pulse section; 302. a lens; 303. an optical fiber.

Detailed Description

The technical solution of the present application is further illustrated by the following specific examples, which do not represent limitations on the scope of the present application. Some insubstantial modifications and adaptations of the application based on the inventive concept by others remain within the scope of the application.

The terms and words used in the following description and claims are not limited to the written meanings, but are used only by the inventors to allow a clear and consistent understanding of the application. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present application are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.

It should be understood that the singular forms "a," "an," "the," and "the" include plural referents unless the context clearly dictates otherwise. In the present application, the expression "or" includes any or all combinations of words listed together. For example, "a or B" may contain a or B, or may contain both a and B. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Throughout the description and claims of this specification, the words "comprise" and "contain" and variations of the words, such as "comprising" and "comprises", mean "including but not limited to", and are not intended to (and do not) exclude other elements, integers or steps.

In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The disclosure provides a multi-path laser, as shown in fig. 3 and 4, including a laser unit 101, a motor 205, a first mirror 202 and a second mirror 203, where the laser unit 101 is configured to generate laser, the motor 205 is configured to drive the first mirror 202 and the second mirror 203 to rotate together, and the first mirror 202 and the second mirror 203 remain parallel during rotation of the first mirror 202 and the second mirror 203, where the laser R excited by the laser unit 101 is incident on the first mirror 202, reflected by the first mirror 202, and reaches the second mirror 203 to be reflected.

It should be noted that: as shown in fig. 5, when the motor 205 rotates, the first mirror 202 and the second mirror 203 rotate synchronously with the bracket 204, and the normal lines of the two mirrors are always parallel to each other. The solid line arrow and the broken line arrow represent the optical paths of the laser light before and after rotation, respectively, the solid line is the laser light 206 of the start pulse segment, and the broken line is the laser light 207 of the stop pulse segment. The laser deflection due to the rotation of the first mirror 202 is offset by the rotation of the second mirror 203 so that the laser 207 of the output cut-off pulse segment is not angularly deflected (strictly speaking, the "delay" caused by the light transmission in the rotating arm needs to be considered, which is angularly deflected, but because the "delay" is only on the order of ns, which is much smaller than the us order of the pulse width, it is negligible). Therefore, the laser beam 206 of the start pulse segment and the laser beam 207 of the stop pulse segment are not deflected in the same direction, and there is only a positional shift x between them. The optical fiber 303 is disposed at or near the focal point of the lens 302. After focusing through the lens 302, the laser of the start pulse section and the cut-off pulse section are both focused on the end face of the optical fiber 303, the incidence positions of the laser and the cut-off pulse section are the same, and the laser pulse can be completely received by the fiber core of the optical fiber 303. At this time, the laser 206 of the start pulse segment is normally incident, the laser 207 of the stop pulse segment is obliquely incident, and the incident angle γ satisfies: γ=arctan (x/F). As long as this angle γ does not exceed the output aperture angle of the optical fiber 303, the optical energy obtained by the optical fiber 303 is not lost and the optical power is high.

The start pulse segment is understood to be the first segment in a pulse period and the stop pulse segment is understood to be the last segment in a pulse period.

As an example of a possible solution, the focal length of the lens 302 may be chosen to be 25mm, the tilt angle θ=45° of the first mirror 202 to the second mirror 203, the swivel arm l=18 mm, and the focal length f=25 mm of the lens 302. In the high frequency (f=25 Hz) wide pulse width (t=800 us) mode, the off pulse segment is offset by an angle 2β=10.2° between the first mirror 202 and the second mirror 203, offset by x=3.2 mm after the second mirror 203, and offset by an angle γ=7.4° after the lens 302, which is less than the normal medical fiber input aperture angle of 12.7 °, and the light energy can be received entirely by the fiber 303.

Specifically, the first mirror 202 and the second mirror 203 rotate around a first rotation axis, a projection of the first rotation axis on the vertical plane is located in a projection of the second mirror 203 on the vertical plane, and the first mirror 202 receives the laser light at the corresponding position by rotating around the first rotation axis, wherein the vertical plane is perpendicular to the first rotation axis. More specifically, the first mirror 202 and the second mirror 203 are mounted to the bracket 204, the output shaft S of the motor 205 is fixedly connected to the bracket 204, and the second mirror 203 is located on an extension line of the output shaft S of the motor 205.

The first rotation axis is a virtual axis, and is used to indicate an axis about which the first mirror 202 and the second mirror 203 rotate. In the above embodiment, the first rotation axis is positioned on the same line as the output shaft S of the motor 205.

Optionally, the laser unit comprises a plurality of optical resonators through which the laser light is emitted. Each optical resonant cavity is composed of a condensing cavity 102, a total reflection mirror 103 and a partial reflection mirror 104. The condensing cavity 102 emits laser light, and the laser light is reflected by the total reflection mirror 103 and the partial reflection mirror 104 a plurality of times, and then emits laser light of a specific wavelength. Furthermore, alternative ways of the laser unit are various and are not limited to the above-described structure.

The optical path of the laser light emitted from the laser unit is parallel to the first rotation axis. Specifically, the laser light emitted from the laser unit is first emitted from the laser unit in a direction parallel to the first rotation axis, then reflected by the first mirror 202, reaches the second mirror 203, and is reflected by the second mirror 203 to be emitted in a direction parallel to the first rotation axis.

The laser unit 101 can excite multiple laser beams, and the optical paths of the laser beams emitted from the laser unit are rotationally symmetrical about the first rotation axis. Specifically, the plurality of optical resonators of the laser unit 101 can emit laser light along the extending direction of the first rotation axis, and each of the optical resonators is rotationally symmetrical about the first rotation axis, so that the optical paths of the laser light emitted from each of the optical resonators are also rotationally symmetrical about the first rotation axis.

Optionally, the center of gravity of the bracket 204 is located on the first rotation axis. This ensures the stability of rotation during rotation of the first mirror 202 and the second mirror 203.

Alternatively, the normal of the first mirror 202 is at a 45 ° angle to the first axis of rotation and the normal of the second mirror 203 is at a 45 ° angle to the first axis of rotation. The angle between the normal line of the first mirror 202 and the first rotation axis is not limited to 45 °, and may be adjusted according to practical situations. Similarly, the angle between the normal line of the second reflecting mirror 203 and the first rotation axis is not limited to 45 °, and can be adjusted according to practical situations.

Alternatively, the first mirror 202 is driven to rotate together with the second mirror 203 by the motor 205, and the first mirror 202 and the second mirror 203 are kept parallel during the rotation of the first mirror 202 and the second mirror 203, so that the laser light emitted from the second mirror 203 is parallel to the laser light incident on the first mirror 202. Specifically, the first mirror 202 and the second mirror 203 are driven to rotate together by the motor 205 and kept parallel to each other, so that the laser light emitted from the second mirror 203 is only translated but not deflected.

In addition, the present disclosure provides a laser system including a lens 302, an optical fiber 303, and multiple lasers, wherein laser light emitted from the multiple lasers is emitted into the optical fiber 303 through the lens 302.

Optionally, the angle of deflection of the laser light at the lens 302 is smaller than the fiber input aperture angle of the optical fiber 303, wherein the optical fiber 303 is collinear with the first axis of rotation.

In the laser system described above, first, the laser unit 101 in the multi-path laser emits laser light, and the laser light reaches the first mirror and is reflected to the second mirror, and since the first mirror and the second mirror rotate in parallel in synchronization, the laser light emitted from the second mirror has the same direction in one pulse period, and no deflection occurs, so that the laser light can be accurately transmitted into the optical fiber by the subsequent lens, and the consumption during the transmission period can be reduced. In some embodiments, the multiple lasers are timed to emit laser light. Specifically, when the first mirror 202 is rotated to face the exit of one of the optical resonators of the laser unit 101, the optical resonator emits laser light, and the other optical resonators of the laser unit do not emit laser light. The other optical resonator emits laser light when the first mirror 202 is rotated to face the other optical resonator.

The foregoing description is provided with reference to the accompanying drawings in order to facilitate a thorough understanding of the various embodiments of the application as defined by the claims. It contains various specific details to aid in this understanding, but these should be considered exemplary only. Accordingly, one of ordinary skill in the art will recognize that variations and modifications can be made to the various embodiments described herein without departing from the scope of the application as defined by the appended claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

Claims (10)

1. The utility model provides a multichannel laser instrument, its characterized in that includes laser unit, motor, first speculum and second speculum, laser unit is used for producing laser, the motor is used for driving first speculum with the rotation together of second speculum, and in the rotation in-process of first speculum with the second speculum, first speculum with the second speculum keeps parallelism, wherein, laser that laser unit arouses is incident in first speculum, through reach after the reflection of first speculum the second speculum is reflected again.

2. The multiplexing laser of claim 1 wherein the first mirror and the second mirror rotate about a first axis of rotation, the projection of the first axis of rotation on the vertical plane being within the projection of the second mirror on the vertical plane, the first mirror receiving laser light at a corresponding location by rotating about the first axis of rotation.

3. The multiple laser of claim 2, wherein the optical path of the laser light excited by the laser unit is parallel to the first axis of rotation.

4. A multiple laser according to claim 3, wherein the laser unit is capable of exciting multiple lasers, and the optical paths of the lasers are rotationally symmetrical about the first rotation axis.

5. The multiple laser of claim 4, wherein the laser unit includes a plurality of optical resonant cavities through which laser light is emitted.

6. The multiple laser of claim 5, wherein the first mirror and the second mirror are positioned on a support, and the motor rotates the support to rotate the first mirror and the second mirror together, wherein a center of gravity of the support is positioned on the first axis of rotation.

7. The multiplexing laser of any of claims 2-6 wherein the normal to the first mirror is at a 45 ° angle to the first axis of rotation and the normal to the second mirror is at a 45 ° angle to the first axis of rotation.

8. The multiple laser according to claim 1, wherein the first mirror and the second mirror are driven to rotate together by the motor, and laser light emitted from the second mirror is parallel to each other during rotation of the first mirror and the second mirror.

9. A laser system comprising a lens, an optical fiber, and a multiple laser according to any one of claims 1-8, wherein laser light emitted from the multiple laser is directed into the optical fiber through the lens.

10. The laser system of claim 9, wherein the angle of deflection of the laser light at the lens is less than the fiber input aperture angle of the optical fiber, wherein the optical fiber is collinear with the first axis of rotation.