Laser device with power feedback regulation function

Abstract

The invention discloses a laser device with a power feedback regulation function, which comprises an optical module and an electric module, and is characterized in that the optical module comprises at least two chip assemblies and is used for emitting pump light; the collimating part is positioned on an output light path of the pump light and is used for converting the pump light into collimated light; the polarization beam combining element is positioned on an output light path of the at least two beams of collimated light and is used for combining the collimated light with orthogonal polarization states and outputting combined light; the photoelectric detection element is positioned on a light emitting path of the light leakage surface of the polarization beam combination element and is used for detecting a light leakage signal of the polarization beam combination element; the photoelectric detector is arranged on the light leakage face of the polarization beam combiner to detect light leakage signals, redundant light energy can be absorbed, the power condition of the pumping source is monitored based on the obtained light leakage signals, leaked light is prevented from hitting a shell to generate heat energy, and the heat dissipation problem of the shell is relieved.

Description

Technical Field

[0001] The embodiments of the invention relate to the field of laser technology, and in particular to a laser device with a power feedback regulation function. Background Art

[0002] With the continuous development and promotion of laser technology, more and more traditional / new manufacturing industries have begun to adopt laser technology to improve processing quality and efficiency. As one of the core components of fiber lasers, the pump source is also constantly exploring and breaking through in the direction of higher power and higher brightness. Higher power requires more optical chips to be stacked, and the power instability brought about also increases. The current method is to perform temperature control to stabilize the optical power within a certain range.

[0003] Traditional high-power pump sources generally use the optical paths of multiple pump optical modules to superimpose, and achieve high-power, high-brightness laser output through beam shaping, beam combining, and focusing coupling. In order to maintain the beam quality unchanged and considering the cost issue, manufacturers usually use polarization beam combining.

[0004] The performance of the polarization beam combiner (PBC) is often affected by the polarization state of the incident light. When the polarization state of the incident light does not match the design requirements of the polarization beam combiner (PBC), the light beams may not be fully combined, resulting in light leakage. (The amount of light leakage at the combining end is determined by the polarization degree of the PBC and the polarization degree of the laser. This property will not change after the laser is manufactured, and the proportion of light leakage is a fixed value.) If the light leakage is not utilized, it will be reflected multiple times in the pump source and absorbed by the shell, causing the shell temperature to rise. Summary of the invention

[0005] The present invention provides a laser device with a power feedback regulation function. A photoelectric detector is arranged on the light leakage surface of a polarization beam combiner to detect a leakage light signal, which can absorb excess light energy and monitor the power of a pump source based on the obtained leakage light signal, thereby avoiding leakage light from hitting a shell to generate heat energy and alleviating the heat dissipation problem of the shell.

[0006] In a first aspect, the present application provides a laser device with a power feedback regulation function, including an optical module, wherein the optical module includes:

[0007] At least two chip assemblies, the chip assemblies comprising a plurality of light-emitting chips, the light-emitting chips being used to emit pump light;

[0008] A plurality of collimating elements are located on the output optical path of the pump light, each of the collimating elements being arranged corresponding to each light-emitting chip in each chip assembly to convert the pump light into collimated light;

[0009] A polarization beam combining element, located on an output optical path of at least two of the collimated lights, for combining the collimated lights with orthogonal polarization states to output a combined light beam;

[0010] The photoelectric detection element is located on the light-emitting optical path of the light leakage surface of the polarization beam combining element, and is used to detect the light leakage signal of the polarization beam combining element, and monitor the fluctuation of the laser power of the chip component based on the light leakage signal.

[0011] Optionally, it further comprises an electrical module, wherein the electrical module is electrically connected to the optical module;

[0012] The electrical module includes a control circuit configured to adjust the power value of the pump light based on the comparison between the leakage light signal and a reference signal, so as to control the laser power of the combined light to be stable.

[0013] Optionally, adjusting the power value of the pump light based on the comparison between the leakage light signal and a reference signal includes:

[0014] The reference signal is used to differentiate the light leakage signal to obtain an error signal;

[0015] When it is determined that the polarity of the error signal is negative, the driving current of the chip component is controlled to decrease, and the value of the driving current decrease is proportional to the absolute value of the light leakage signal;

[0016] When it is determined that the polarity of the error signal is positive, the driving current of the chip component is controlled to increase, and the increased value of the driving current is proportional to the absolute value of the light leakage signal.

[0017] Optionally, the photoelectric detection element is fixedly arranged on the light leakage surface of the polarization beam combining element; or, the distance between the photoelectric detection element and the light leakage surface of the polarization beam combining element is less than a preset value;

[0018] The light-sensitive surface of the photoelectric detection element is larger than or equal to the light-leaking surface of the polarization beam combining element.

[0019] Optionally, at least two beam steering components are further included; the beam steering components are arranged on the optical path between the collimating component and the polarization beam combining element, so as to redirect the collimated light to the polarization beam combining element.

[0020] Optionally, it further comprises a housing, on which the plurality of chip components are arranged, and the light-emitting centers of the plurality of light-emitting chips are at the same reference height; or,

[0021] The light emitting centers of the light emitting chips on the same road are all at different reference heights.

[0022] Optionally, at least one of the beam steering assemblies includes a plurality of first reflectors and at least one second reflector; wherein each of the first reflectors is correspondingly arranged at the beam output end of each of the collimating components to redirect the collimated light to the second reflector, and the second reflector is used to reflect the incident collimated light beam to the polarization beam combining element, and the second reflector and each of the first reflectors are arranged perpendicular to the shell.

[0023] Optionally, the at least two-way chip assembly includes a first chipset and a second chipset.

[0024] The first pump light emitted from the first chipset is converted into the first collimated light by the collimating element, and the second pump light emitted from the second chipset is converted into the second collimated light by the collimating element;

[0025] The first collimated light is deflected by the first beam deflection component and then reflected by the polarization beam combining element and then output along the first direction. The second collimated light is deflected by the second beam deflection component and then transmitted through the polarization beam combining element and then output along the first direction.

[0026] Optionally, a half-wave plate is further included, and the half-wave plate is arranged on the optical path between the second collimated light and the polarization beam combining element to adjust the polarization direction of the second collimated light.

[0027] Optionally, a beam outcoupling element is further included, and the beam outcoupling element is located on the optical path of the outcoupling output end of the polarization beam combining element:

[0028] The light beam coupling element comprises a fast axis coupling lens, a slow axis coupling lens and an optical fiber which are arranged in sequence. The fast axis coupling lens and the slow axis coupling lens are used to focus the combined light in the fast axis and slow axis directions respectively and couple the combined light into the optical fiber.

[0029] In summary, the laser device with power feedback regulation function provided in the present application absorbs excess light energy by setting a photoelectric detection element on the light leakage surface of the polarization beam combining element, and monitors the power of the pump source based on the obtained leakage light signal, thereby avoiding the leakage light from hitting the shell to generate heat energy and alleviating the heat dissipation problem of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a laser device with power feedback regulation function provided by the present application;

[0031] Figure 2 It is a module schematic diagram of a PID control circuit provided by the present application;

[0032] Figure 3 is a schematic diagram of another laser device with power feedback regulation function provided by the present application;

[0033] Figure 4 It is a schematic diagram of another laser device with power feedback regulation function provided in the present application.

[0034] The accompanying drawings are as follows:

[0035] 1. Chip assembly; 2. Collimation component; 3. Polarization beam combining element; 4. Photoelectric detection element; 20. Control circuit; 5. Beam steering assembly; 51. First reflector; 52. Second reflector; 21. Fast-axis collimating lens; 22. Slow-axis collimating lens; 6. Half-wave plate; 7. Beam decoupling element; 71. Fast-axis coupling lens; 72. Slow-axis coupling lens; 73. Optical fiber; 8. Housing. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It will be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings. It is obvious to those skilled in the art that various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and changes of the present invention that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other without contradiction.

[0037] The present invention proposes a laser device in view of one or more of the above problems existing in the prior art. Figure 1 is a schematic diagram of a laser device with power feedback regulation function provided by the present application, with reference to Figure 1 The laser device provided by an embodiment of the present invention includes an optical module and an electrical module that are electrically connected. The optical module includes at least two chip components 1, a collimator 1, a polarization beam combining element 3 and a photoelectric detection element 4, and the electrical module includes a control circuit 20.

[0038] The chip assembly 1 includes a plurality of light-emitting chips 10, and the light-emitting chips 10 are used to emit pump light S. The chip assembly 1 can also be understood as a pump source. Figure 1 Taking the two-way chip assembly 1 as an example, the pump light emitted by the light-emitting chip 10 in the two-way chip assembly 1 is emitted along the A direction to the collimator 2, and after being turned by the collimator 2, is transmitted along the B direction to the polarization beam combining element 3. The A direction and the B direction are orthogonal.

[0039] The collimator 2 is located on the output optical path of the pump light S and is used to convert the pump light S into collimated light. Usually, the divergence angle of the pump light emitted by the chip assembly 1 is relatively large. By using the collimator 2 to collimate the pump light S, the pump light can be adjusted to be linearly polarized collimated light. In the embodiment of the present invention, the collimator 2 may include a fast axis collimator and a slow axis collimator ( Figure 1 (not shown in the figure), the fast axis collimator can be used to collimate the light spot in the fast axis direction of the laser, and the slow axis collimator can be used to collimate the light spot in the slow axis direction of the laser.

[0040] The polarization beam combining element 3 is arranged on the output optical path of at least two collimated light beams S, and is used to combine the collimated light beams with orthogonal polarization states to output a combined light beam. By way of example, a polarization beam combiner (PBC) can be used. In an embodiment of the present invention, the shape of the polarization beam combiner can be sheet-shaped or block-shaped, and can combine and output orthogonally polarized pump light S. Among them, the polarization beam combiner includes a fiber polarization beam combiner or a polarization beam splitter, which can couple two orthogonal polarized light beams into one optical fiber, or couple the orthogonal linear polarized light contained in one optical fiber into two polarization-maintaining optical fibers respectively, and the polarization direction is parallel to the slow axis of the polarization-maintaining optical fiber.

[0041] In the embodiment of the present invention, the number of chip components 1 can be reasonably selected according to the output power. Each group of chip components 1 emits one pump light S. After the multiple pump lights S are beam shaped by the collimator 2, combined by the polarization beam combining element 3, and focused and coupled, high-power and high-brightness laser output is achieved.

[0042] The polarization beam combining element 3 has a light leakage problem during beam combining. In an embodiment of the present invention, at least one photoelectric detection element 4 is arranged on the output light path of the light leakage surface of the polarization beam combining element 3 to detect the light leakage signal of the polarization beam combining element 3, and monitor the fluctuation of the laser power of the chip component based on the light leakage signal.

[0043] The light leakage surface can also be understood as the non-beam combining output end of the polarization beam combining element 3. Figure 1 Due to the polarization characteristics of the pump light S emitted by the chip component 1, some light will leak out from the non-beam combining output end of the polarization beam combining element 3 and be lost as stray light. Usually, the stray light loss ratio is fixed and does not change due to power fluctuations. The embodiment of the present invention monitors the leakage light, determines the laser power output of the combined light, and increases or decreases the laser power of the pump light based on this, so as to achieve the purpose of stable output of the laser power of the combined light.

[0044] For example, taking the polarization degree of the pump light S emitted by the chip assembly 1 as 97%, the beam combining principle of the polarization beam combiner PBC is related to the polarization of light. At this time, about 3% of the polarized light of other components will be reflected or transmitted to become PBC leakage light. This leakage light affects the stability of the laser output. In the embodiment of the present invention, reference Figure 1 At least one photoelectric detection element 4 is provided on the light leakage surface of the polarization beam combining element 3 (polarization beam combiner PBC), such as a photoelectric detector (PD), to detect the light leakage signal of the light leakage surface of the polarization beam combining element 3. The light leakage signal includes a current signal, a voltage signal, and the like.

[0045] It can be noted that the amount of light leakage at the beam combining end is determined by the polarization degree of the PBC and the polarization degree of the laser. This property will not change after the laser is manufactured. The ratio between the power of the leakage light and the power of the pump light emitted by the pump source is a fixed value, that is, the light leakage signal is linearly related to the laser output power of the chip component 1. Therefore, by monitoring the light leakage of the polarization beam combiner, the change of the output power of the chip component 1 can be obtained. At the same time, the photodetector can also absorb excess light energy to prevent the leakage light from hitting the shell to generate heat energy, thereby alleviating the heat dissipation problem of the shell.

[0046] Based on the above embodiments, Figure 1 The laser device also includes an electrical module, which is electrically connected to the optical module. The electrical module includes a control circuit 20. The photodetection element 4 is electrically connected to the control circuit 20. The control circuit 20 is configured to adjust the power value of the pump light S based on the comparison between the leakage light signal and the reference signal to control the laser power stability of the combined light.

[0047] Exemplarily, when the polarization beam combining element 3 (PD) detects leakage light, a photocurrent is generated, and the current further generates a voltage through a resistor. The control circuit 20 reads the voltage signal and compares it with a preset reference signal. When the leakage light signal is greater than the reference signal, the power value of the pump light S is controlled to be reduced; when the leakage light signal is less than the reference signal, the power value of the pump light S is controlled to be increased to stabilize the laser power of the combined light.

[0048] Therefore, the embodiment of the present invention can solve the problem of overall light output instability by monitoring the leakage light signal of the polarization beam combining, adjusting the driving current of the chip component, timely compensating for the fluctuation of the laser power of the beam combining light, and quickly stabilizing the optical power output.

[0049] Figure 2 This is a module schematic diagram of a PID control circuit provided by this application, refer to Figure 1 and Figure 2On the basis of the above embodiment, the control circuit 20 can adopt a PID control circuit (Proportion Integration Differentiation, PID, proportional-integral-differential controller), which is mainly composed of a proportional amplifier (P), an integral operator (I) and a differential operator (D). It is a linear control circuit 20 that can meet the control requirements of most closed scenes. The PID control circuit differentiates the reference signal from the light leakage signal to obtain an error signal. According to the polarity and size of the error signal, the driving current of the chip component current source is increased or decreased, thereby achieving a stable output of the pump source power.

[0050] Wherein, the reference signal is V, the leakage signal is U, (VU) represents the difference between the reference signal V and the leakage signal UZ, and (VU) represents the error signal.

[0051] Specifically, when the PID control circuit determines that the polarity of the error signal is negative, that is, (VU) < 0, this indicates that the power of the pump light output by the chip component 1 is higher than the preset value, and the drive current of the control chip component 1 is reduced. The value of the drive current reduction is proportional to the absolute value |VU| of the leakage light signal. It can be understood that the larger the absolute value |VU| of the error signal with a negative polarity, the greater the value of the drive current reduction.

[0052] When the PID control circuit determines that the polarity of the error signal is positive, that is, (VU)>0, this indicates that the power of the pump light output by the chip component 1 is lower than the preset value, and the drive current of the control chip component 1 increases. Among them, the value of the increase in the drive current is proportional to the absolute value |VU| of the leakage light signal. It can be understood that the larger the absolute value |VU| of the error signal with a positive polarity, the greater the value of the control drive current decrease and increase.

[0053] The embodiment of the present invention uses a photodetector PD to monitor the light leakage at the beam combining end of the pump source in real time, which is beneficial to ensure the stability of the optical power output of the chip component (pump source). The PID control circuit is used to feedback and adjust the current in the electrical module, which has the advantages of fast system response speed and high adjustment accuracy. By judging the polarity and size of the error signal to adjust the size of the driving current and adjust the pump light power output by the chip component, the laser power of the combined light can be stabilized, thereby solving the problem of unstable optical power output of the pump source by using the light leakage of the internal beam combiner of the pump source.

[0054] It should be noted that when multiple photoelectric detection elements are provided to detect the light leakage signal of the light leakage surface, the final light leakage signal is determined by the superposition value of the multiple light leakage signals.

[0055] In some embodiments, the photoelectric detection element 4 is fixed on the light leakage surface of the polarization beam combining element 3. Such a configuration is conducive to collecting all the leakage light and improving the signal strength of the detection leakage light signal.

[0056] Figure 3 is a schematic diagram of another laser device with power feedback regulation function provided by the present application, wherein: Figure 3 The control circuit is not shown. Figure 1 and Figure 3 As shown, in the embodiment of the present invention, the distance between the photoelectric detection element 4 and the light leakage surface of the polarization beam combining element 3 can also be set to be smaller than a preset value. Exemplarily, the preset value ranges from 0 to 4 cm.

[0057] Based on the above embodiments, Figure 1 and Figure 3 The photosensitive surface of the photodetection element 4 is set to be greater than or equal to the light leakage surface of the polarization beam combining element 3. In this way, it can be ensured that the photodetection element 4 collects all the leakage light of the polarization beam combining element 3, improve the monitoring accuracy of the error signal, and ultimately improve the stability of laser power regulation.

[0058] Based on the above embodiments, Figure 3 The laser device also includes at least two beam steering components 5; the beam steering components 5 are arranged on the optical path between the collimator 2 and the polarization beam combining element 3 to redirect the collimated light to the polarization beam combining element 3.

[0059] Optionally, refer to Figure 3 The collimating element 2 includes a fast-axis collimating lens 21 and a slow-axis collimating lens 22 which are arranged in sequence, wherein the fast-axis collimating lens 21 can be used to collimate the light spot in the fast-axis direction of the laser, and the slow-axis collimating lens 22 can be used to collimate the light spot in the slow-axis direction of the laser.

[0060] Optionally, refer to Figure 3 At least one beam steering component 5 includes a plurality of first reflectors 51 and at least one second reflector 52, wherein each first reflector 5 is correspondingly arranged at the beam output end of each collimating component 2 to redirect the collimated light to the second reflector 52, and the second reflector 52 is used to reflect the incident collimated light beam to the polarization beam combining element 3, and the second reflector 52 and each first reflector 51 are arranged perpendicular to the shell 8. Such an arrangement is conducive to the transmission of the collimated light to the polarization beam combining element 3 in the horizontal plane, meeting the energy requirements of horizontal placement of most laser devices.

[0061] Figure 4 is a schematic diagram of another laser device with power feedback regulation function provided by the present application. Figure 3 and Figure 4The laser device further comprises a housing 8 for carrying and packaging various components of the laser device, and the multi-channel chip components 1 are all arranged on the housing 8 .

[0062] In some embodiments, reference Figure 3 The light emission centers of the multiple light emitting chips 10 are at the same reference height. With this arrangement, the multiple pump lights are coplanar, which is conducive to achieving optical axis coaxiality after being beam-combined by the polarization beam combining element 3, thereby improving the laser coupling efficiency.

[0063] In some embodiments, reference Figure 4 , the light-emitting centers of the light-emitting chips 10 in the same path are all in shells with different reference heights. For example, according to the number of light-emitting chips 10 in the chip assembly 1, a step structure is set at the position of the shell 8 corresponding to each chip assembly 1, and a light-emitting chip 10 is placed on each step structure, and the light-emitting centers of multiple light-emitting chips 10 in the same path are all in different planes. After a plurality of light-emitting chips 10 in one path are collimated by the collimating component 2, they are reflected to the polarization beam combining element 3 by the corresponding first reflector 51, and after a plurality of light-emitting chips 10 in one path are collimated by the collimating component 2, they are reflected to the polarization beam combining element 3 by the corresponding first reflector 51 and second reflector. The multi-path collimated light is stacked in the fast axis direction, beam-combined by the polarization beam combining element 3, and then reflected to the beam coupling element 7 by the third reflector 53 for coupling out. Such a setting is conducive to the coupling output of multi-path pump light and improves the laser coupling efficiency.

[0064] Based on the above embodiments, Figure 3 The laser device further includes a beam coupling element 7, which is arranged on the optical path of the coupling output end of the polarization beam combining element 3 and is used to couple out the laser beam. Optionally, the beam coupling element 7 includes a fast axis coupling lens 71, a slow axis coupling lens 72 and an optical fiber 73 arranged in sequence. The fast axis coupling lens 71 and the slow axis coupling lens 72 are used to focus the combined beam in the fast axis and slow axis directions respectively and couple them into the optical fiber 73. Among them, Figure 4 The optical fiber is not shown.

[0065] Among them, the fast axis coupling lens 71 can also be called a fast axis collimating lens. The fast axis collimating lens (FAC) can compensate for the divergence angle of the fast axis of the laser device and improve the laser coupling efficiency. The slow axis coupling lens 7271 can also be called a slow axis collimating lens. The use of a slow axis collimating lens (SAC) can compensate for the divergence angle of the slow axis of the laser device and improve the laser coupling efficiency. The combined laser is collimated and coupled by the fast axis coupling lens 71 and the slow axis coupling lens 72 and enters the optical fiber 73 for transmission.

[0066] Based on the above embodiments, Figure 3At least two chip assemblies 1 include a first chip group 11 and a second chip group 12. The first chip group 11 and the second chip group 12 are arranged opposite to each other, and the first light-emitting chip 110 in the first chip group 11 and the second light-emitting chip 120 in the second chip group 12 are arranged along the direction B in the figure.

[0067] The first chip group 11 emits a first pump light S1, and the second chip group 12 emits a second pump light S2. The first pump light S1 is converted into a first collimated light by the collimator 2, and the second pump light S2 emitted from the second chip group 12 is converted into a second collimated light by the collimator 2.

[0068] Exemplarily, the polarization states of the first collimated light and the second collimated light are orthogonal, the first collimated light is S polarized light, and the second collimated light is P polarized light. The second collimated light is redirected by the first beam steering assembly (comprising a plurality of first reflectors 51 and second reflectors 52), and then reflected by the polarization beam combining element 3 along the first direction ( Figure 3 The second collimated light is output in the first direction (B direction), and the second collimated light is redirected by the second beam steering component (including a plurality of first reflectors 51) and then passes through the polarization beam combining element 3 and then travels along the first direction ( Figure 3 The first collimated light and the second collimated light are outputted in the same beam direction ( Figure 3 B direction) output to obtain combined light.

[0069] Optional, reference Figure 3 The laser device also includes a half-wave plate 6, which is located on the optical path of the second pump light S2 between the beam steering component 5 and the polarization beam combining element 3. The half-wave plate 6 can also be called a phase delay plate or a 1 / 2 wave plate. The half-wave plate 6 is made of birefringent material, and the half-wave plate 6 can arbitrarily change the polarization direction of linear polarization, for example, convert vertical polarization light into horizontal polarization light. In some embodiments, the polarization directions of the first collimated light and the second collimated light are not orthogonal, and the polarization direction of the second collimated light can be adjusted by adding a half-wave plate 6 so that the polarization directions of the second collimated light and the first collimated light are orthogonal.

[0070] In summary, the laser device provided in the present application arranges a photodetector on the light leakage surface of the polarization beam combiner to detect the leakage light signal, and arranges a control circuit to adjust the power value of the pump source according to the leakage light signal, thereby utilizing the light leakage of the internal beam combiner of the pump source to solve the problem of unstable optical power output of the pump source.

[0071] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A laser device with power feedback regulation function, characterized in that: The optical module includes: At least two chip assemblies, the chip assemblies comprising a plurality of light-emitting chips, the light-emitting chips being used to emit pump light; A plurality of collimating elements are located on the output optical path of the pump light, each of the collimating elements being arranged corresponding to each light-emitting chip in each chip assembly to convert the pump light into collimated light; A polarization beam combining element, located on an output optical path of at least two of the collimated lights, for combining the collimated lights with orthogonal polarization states to output a combined light beam; The photoelectric detection element is located on the light-emitting optical path of the light leakage surface of the polarization beam combining element, and is used to detect the light leakage signal of the polarization beam combining element, and monitor the fluctuation of the laser power of the chip component based on the light leakage signal.

2. The laser device according to claim 1, characterized in that Also includes an electrical module, the electrical module is electrically connected to the optical module; The electrical module includes a control circuit configured to adjust the power value of the pump light based on the comparison between the leakage light signal and a reference signal, so as to control the laser power of the combined light to be stable.

3. The laser device according to claim 2, characterized in that: The adjusting the power value of the pump light based on the comparison between the leakage light signal and the reference signal includes: The reference signal is used to differentiate the light leakage signal to obtain an error signal; When it is determined that the polarity of the error signal is negative, the driving current of the chip component is controlled to decrease, and the value of the driving current decrease is proportional to the absolute value of the light leakage signal; When it is determined that the polarity of the error signal is positive, the driving current of the chip component is controlled to increase, and the increased value of the driving current is proportional to the absolute value of the light leakage signal.

4. The laser device according to claim 1, characterized in that The photoelectric detection element is fixedly arranged on the light leakage surface of the polarization beam combining element; or the distance between the photoelectric detection element and the light leakage surface of the polarization beam combining element is less than a preset value; The light-sensitive surface of the photoelectric detection element is larger than or equal to the light-leaking surface of the polarization beam combining element.

5. The laser device according to claim 1, characterized in that It also includes at least two beam steering components; the beam steering components are arranged on the optical path between the collimating component and the polarization beam combining element to redirect the collimated light to the polarization beam combining element.

6. The laser device according to claim 5, characterized in that It also includes a housing, and the plurality of chip components are arranged on the housing; The light emitting centers of the plurality of light emitting chips are at the same reference height; or, The light emitting centers of the light emitting chips on the same road are all at different reference heights.

7. The laser device according to claim 6, characterized in that At least one of the beam steering components includes multiple first reflectors and at least one second reflector; wherein each of the first reflectors is correspondingly arranged at the beam output end of each of the collimating components to redirect the collimated light to the second reflector, and the second reflector is used to reflect the incident collimated light beam to the polarization beam combining element, and the second reflector and each of the first reflectors are arranged perpendicular to the shell.

8. The laser device according to claim 5, characterized in that The at least two-way chip assembly includes a first chip set and a second chip set, The first pump light emitted from the first chipset is converted into the first collimated light by the collimating element, and the second pump light emitted from the second chipset is converted into the second collimated light by the collimating element; The first collimated light is deflected by the first beam deflection component and then reflected by the polarization beam combining element and then output along the first direction. The second collimated light is deflected by the second beam deflection component and then transmitted through the polarization beam combining element and then output along the first direction.

9. The laser device according to claim 8, characterized in that A half-wave plate is also included, and the half-wave plate is arranged on the optical path between the second collimated light and the polarization beam combining element to adjust the polarization direction of the second collimated light.

10. The laser device according to claim 1, characterized in that It also includes a light beam outcoupling element, which is located on the optical path of the outcoupling output end of the polarization beam combining element: The light beam coupling element comprises a fast axis coupling lens, a slow axis coupling lens and an optical fiber which are arranged in sequence. The fast axis coupling lens and the slow axis coupling lens are used to focus the combined light in the fast axis and slow axis directions respectively and couple the combined light into the optical fiber.

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