Light leakage detection method and light leakage detection device

Abstract

The present application discloses a light leakage detection method and a light leakage detection device, which is applied to a light leakage detection device, and the method includes: a controller sends a first control signal to a programmable power supply, so that the programmable power supply outputs a constant preset current to a sample to be tested, wherein the constant preset current is less than a threshold current of the sample to be tested, so that the sample to be tested works in a light-emitting diode mode; the controller sends a second control signal to a signal detection device, so that the signal detection device obtains the signal strength of the light-emitting surface and the high-reflective surface of the sample to be tested; the controller determines whether the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface falls within a preset signal strength range; if the difference falls within the preset signal strength range, it is determined that the high-reflective surface of the sample to be tested leaks light. In the above manner, the present application can determine whether there is a light leakage problem on the high-reflective surface of the sample to be tested, thereby improving the speed of detection.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a light leakage detection method and a light leakage detection device. Background Art

[0002] High-power semiconductor lasers have important applications in many fields such as material engineering and manufacturing technology due to their wide wavelength range. Each laser has two parallel cleavage planes. In order to improve the luminous efficiency, a high-reflection film is prepared on one of the cleavage planes so that the light intensity on the anti-reflection surface is instantly increased. However, in actual preparation, due to the actual coating process, design deviations and random deviations of the cleavage angles of the cleavage planes, the reflection effect of the high-reflection film cannot reach the expected value, and light energy leaks from the cleavage plane coated with the high-reflection film, resulting in light leakage. Summary of the invention

[0003] The present application provides a light leakage detection method and a light leakage detection device, which can determine whether there is a light leakage problem on the high-reverse side of a sample to be tested, thereby improving the detection speed.

[0004] In order to solve the above technical problems, the technical solution adopted in the present application is: to provide a light leakage detection method, the method is applied to a light leakage detection device, the light leakage detection device includes a controller, a programmable power supply and a signal detection device, the method includes: the controller sends a first control signal to the programmable power supply, so that the programmable power supply outputs a constant preset current to the sample to be tested, wherein the constant preset current is less than the threshold current of the sample to be tested, so that the sample to be tested works in the light-emitting diode mode; the controller sends a second control signal to the signal detection device, so that the signal detection device obtains the signal strength of the light-emitting surface and the high-reflective surface of the sample to be tested; the controller determines whether the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface falls within the preset signal strength range; if the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface falls within the preset signal strength range, it is determined that the high-reflective surface of the sample to be tested leaks light; wherein the signal strength includes the luminous intensity and the color brightness value, and the sample to be tested includes a laser chip or a bar that has not been packaged.

[0005] In order to solve the above-mentioned technical problems, another technical solution adopted in the present application is: to provide a light leakage detection device, which includes a controller, and a programmable power supply and a signal detection device connected to the controller, the controller is used to send control signals to the programmable power supply and the signal detection device, and receive the signal fed back by the signal detection device, the programmable power supply is used to output a constant preset current to the sample to be tested, and the signal detection device is used to obtain the signal strength of the light-emitting surface and the high-reflective surface of the sample to be tested, wherein the signal strength includes the luminous intensity and the color brightness value, the sample to be tested includes a laser chip or a bar that has not been packaged, and the controller is used to execute the above-mentioned light leakage detection method.

[0006] Through the above scheme, the beneficial effect of the present application is: the controller is used to control the programmable power supply and the signal detection device, so that the programmable power supply can supply power to the sample to be tested, thereby making the sample to be tested emit light, and the signal detection device can collect the light emission conditions of the sample to be tested, and obtain the signal strength of the light-emitting surface and the signal strength of the high-reflective surface. The controller can quickly calculate the difference between the signal strength of the light surface and the signal strength value of the high-reflective surface, and compare the difference with the preset signal strength range, so as to determine whether there is a light leakage problem on the high-reflective surface of the sample to be tested, thereby realizing product quality inspection. Since the light-emitting surface and the high-reflective surface can be tested at the same time, the test efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] 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 creative work. Among them:

[0008] Figure 1 It is a structural schematic diagram of an embodiment of a light leakage detection device provided by the present application;

[0009] Figure 2 It is a flow chart of an embodiment of a light leakage detection method provided by the present application;

[0010] Figure 3 is a flow chart of another embodiment of the light leakage detection method provided by the present application;

[0011] Figure 4 is a structural schematic diagram of another embodiment of the light leakage detection device provided by the present application;

[0012] Figure 5 It is a structural schematic diagram of another embodiment of the light leakage detection device provided in the present application. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0014] See also Figure 1 , Figure 11 is a schematic diagram of the structure of an embodiment of a light leakage detection device provided in the present application. The light leakage detection device includes a controller 11, a programmable power supply 12 and a signal detection device 13.

[0015] The controller 11 is used to execute the light leakage detection method. Specifically, the controller 11 can send control signals to the programmable power supply 12 and the signal detection device 13, and receive signals fed back by the signal detection device 13. The controller 11 can be an MCU (Microcontroller Unit).

[0016] The programmable power supply 12 is connected to the controller 11, and is used to output a constant preset current to the sample to be tested 20 under the control of the controller 11; specifically, the programmable power supply 12 can be a DC power supply, and the sample to be tested 20 includes a laser chip or a bar that has not been packaged. The sample to be tested 20 includes a light-emitting surface and a high-reflective surface arranged opposite to the light-emitting surface. The size of the preset current can be controlled by the controller 11. The controller 11 can output a first control signal to the programmable power supply 12. After receiving the first control signal, the programmable power supply 12 outputs a power signal with a preset current to the sample to be tested 20 to make the sample to be tested 20 emit light, that is, the programmable power supply 12 works in a constant current mode, and its output voltage changes with the load (that is, the sample to be tested 20) to ensure that the output current is constant.

[0017] The signal detection device 13 is used to obtain the signal strength of the light-emitting surface and the high-reflective surface of the sample to be tested 20. Specifically, the signal strength includes the luminous intensity and the color brightness value. After the sample to be tested 20 emits light, the signal detection device 13 can collect the luminous conditions of the sample to be tested 20, thereby obtaining the luminous intensity or color brightness value of the sample to be tested 20.

[0018] In a specific embodiment, Figure 1 As shown, the light leakage detection device also includes a metal platform 14, which is used to place the sample to be tested 20, and the metal platform 14 is connected to the programmable power supply 12 through a wire; specifically, the programmable power supply 12 includes a positive electrode and a negative electrode, and the sample to be tested 20 includes a P pole and an N pole, the P pole of the sample to be tested 20 is connected to the positive pole of the programmable power supply 12, the N pole of the sample to be tested 20 is in contact with the metal platform 14, and the metal platform 14 is connected to the negative pole of the programmable power supply 12, thereby realizing power supply for the sample to be tested 20 through the metal platform 14.

[0019] The light leakage detection device provided in this embodiment uses the controller 11 to control the programmable power supply 12 and the signal detection device 13, which can respond quickly and facilitate timely adjustment of the manufacturing process. The equipment is easy to build and has low cost.

[0020] See also Figure 1 and Figure 2 , Figure 2 is a flow chart of an embodiment of a light leakage detection method provided by the present application, and the method is applied to Figure 1 The light leakage detection device shown, the method comprises:

[0021] Step 21: The controller sends a first control signal to the programmable power supply, so that the programmable power supply outputs a constant preset current to the sample to be tested.

[0022] The sample to be tested 20 includes a laser chip or a bar that has not been packaged, and the constant preset current is less than the threshold current of the sample to be tested 20, so that the sample to be tested 20 operates in the light-emitting diode mode; the controller 11 can control the programmable power supply 12 so that the programmable power supply 12 outputs a constant preset current, and the constant preset current enters the sample to be tested 20, so that the sample to be tested 20 emits light.

[0023] Step 22: The controller sends a second control signal to the signal detection device, so that the signal detection device obtains the signal strength of the light-emitting surface and the high-reflection surface of the sample to be tested.

[0024] The controller 11 is also connected to the signal detection device 13. After the sample 20 to be tested emits light, the controller 11 can send a second control signal to the signal detection device 13. After receiving the second control signal, the signal detection device 13 enters a working state to detect the light emitted by the sample 20 to be tested, and obtains the signal strength of the light-emitting surface and the high-reflection surface. The signal strength includes the luminous intensity and the color brightness value.

[0025] After obtaining the signal strength of the light-emitting surface and the high-reflection surface, the signal detection device 13 can report the signal strength to the controller 11; or the controller 11 can monitor the signal detection device 13, and automatically obtain the signal strength after detecting that the signal detection device 13 collects the signal strength.

[0026] Step 23: The controller determines whether the difference between the signal strength of the light surface and the signal strength of the high-reflective surface falls within a preset signal strength range.

[0027] After obtaining the signal strength of the light-emitting surface and the signal strength of the high-reflective surface, the controller 11 can calculate the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface, and then compare the difference with a preset signal strength range, which can be a value set based on experience; for example, the preset signal strength range is 5. When the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface is less than 5, it is determined that light leakage has occurred on the high-reflective surface.

[0028] Step 24: If the difference between the signal intensity of the light emitting surface and the signal intensity of the high-reflective surface falls within a preset signal intensity range, it is determined that the high-reflective surface of the sample to be tested leaks light.

[0029] If the difference between the signal strength of the light-emitting surface and the signal strength of the high-reflective surface falls within the preset signal strength range, it indicates that the luminescence degree of the high-reflective surface is greater, light leakage occurs, and the quality of the sample 20 to be tested does not meet the requirements; for example, the preset signal strength range is 3.1 to 5.6. If the signal strength of the light-emitting surface is 95.8 and the signal strength of the high-reflective surface is 100.0, the difference between the two is 4.2, which falls within the preset signal strength range, and the high-reflective surface leaks light.

[0030] It should be noted that in other embodiments, the programmable power supply 12 and the signal detection device 13 can also work synchronously under the control of the controller 11, that is, the controller 11 sends control signals to the programmable power supply 12 and the signal detection device 13 at the same time, so that when current is passed through the programmable power supply 12, the signal detection device 13 is also started in real time and can test the sample 20 to be tested.

[0031] The present embodiment provides a light leakage detection method, in which the controller 11 sends a control signal to the programmable power supply 12 and the signal detection device 13, so that the programmable power supply 12 can supply power to the sample 20 to be tested, thereby making the sample 20 to be tested emit light, and the signal detection device 13 can collect the light emission conditions of the sample 20 to be tested, obtain the signal strength of the light-emitting surface and the signal strength of the high-reflective surface, and report them to the controller 11. The controller 11 can quickly calculate the difference between the signal strength of the light surface and the signal strength of the high-reflective surface, and compare the difference with the preset signal strength range, so as to determine whether there is a light leakage problem on the high-reflective surface of the sample 20 to be tested, thereby achieving product quality inspection, helping to find out the process problems existing in the process of manufacturing the sample 20 to be tested, and facilitating timely adjustment of the manufacturing process. Moreover, since the light-emitting surface and the high-reflective surface can be tested at the same time, the test efficiency is higher, which helps to quickly eliminate the influence of optical coating.

[0032] See also Figures 3 to 5 , Figure 3 is a flow chart of another embodiment of the light leakage detection method provided by the present application, Figure 4 is a structural schematic diagram of another embodiment of the light leakage detection device provided by the present application, Figure 5 is a structural schematic diagram of another embodiment of the light leakage detection device provided by the present application, the method comprising:

[0033] Step 31: The controller sends a first control signal to the programmable power supply, so that the programmable power supply outputs a constant preset current to the sample to be tested.

[0034] Step 32: The controller sends a third control signal to the probe, so that the probe inputs the power signal output by the programmable power supply to the sample to be tested.

[0035] The probe 15 is connected to the controller 11 and the programmable power supply 12 respectively. After receiving the third control signal sent by the controller 11, the probe 15 contacts the P pole of the sample 20 to be tested, thereby outputting a constant preset current to the P pole of the sample 20 to be tested.

[0036] In other embodiments, the probe 15 may also always be in contact with the sample 20 to be tested, but only input the power signal output by the programmable power supply 12 to the sample 20 to be tested when receiving the third control signal.

[0037] Step 33: The controller sends a second control signal to the signal detection device, so that the signal detection device obtains the signal strength of the light emitting surface and the high reflective surface of the sample to be tested.

[0038] Step 34: The controller determines whether the difference between the signal strength of the light surface and the signal strength of the high-reflective surface falls within a preset signal strength range.

[0039] The color brightness value in the signal strength includes a brightness value, a range from red to green, and a range from yellow to blue. The controller 11 calculates the color difference using the following formula:

[0040]

[0041] Among them, ΔE is the color difference, L is the brightness value, a is the range from red to green, and b is the range from yellow to blue.

[0042] In a specific embodiment, Figure 4 As shown, the signal detection device includes a photoelectric sensor 131, a first integrating sphere 132 and a second integrating sphere 133. The first integrating sphere 132 and the second integrating sphere 133 are respectively used to gather the light beams emitted from the light emitting surface and the high-reflection surface; the controller 11 can send a second control signal to the photoelectric sensor 131, so that the photoelectric sensor 131 collects the intensity of the light on the first integrating sphere 132 and the second integrating sphere 133 to obtain the luminous intensity of the light emitting surface and the luminous intensity of the high-reflection surface; then calculate the difference between the luminous intensity of the light emitting surface and the luminous intensity of the high-reflection surface.

[0043] The photoelectric sensor 131 can also obtain the color brightness value of the light-emitting surface and the color brightness value of the high-reflection surface, and feed them back to the controller 11; the controller 11 can calculate the color difference of the light-emitting surface according to the color brightness value of the light-emitting surface, and calculate the color difference of the high-reflection surface according to the color brightness value of the high-reflection surface; and then determine whether the difference between the color difference of the light-emitting surface and the color difference of the high-reflection surface falls within a preset signal strength range.

[0044] In this embodiment, the photoelectric sensor 131 can be used to obtain the luminous conditions of the light-emitting surface and the high-reflective surface, and the quality of the light-emitting surface and the high-reflective surface can be judged by testing the luminous intensity, thereby realizing rapid testing of the performance of the sample 20 to be tested.

[0045] In another specific embodiment, Figure 5 As shown, the signal detection device includes a camera device 134, a first whiteboard 135 and a second whiteboard 136. The first whiteboard 135 and the second whiteboard 136 are respectively used to reflect the light beam emitted from the light emitting surface and the light beam emitted from the high-reflection surface. The first whiteboard 135 and the second whiteboard 136 are respectively placed on both sides of the sample 20 to be tested. The surface roughness of the first whiteboard 135 and the second whiteboard 136 is relatively large, and the light can be evenly reflected.

[0046] The controller 11 sends a second control signal to the camera device 134, so that the camera device 134 shoots the first whiteboard 135 and the second whiteboard 136 to obtain the image to be tested. Specifically, the camera device 134 can be a device with a camera function such as a mobile phone or a camera. The image to be tested includes the projection of the light beam emitted from the light emitting surface on the first whiteboard 135 and the projection of the light beam emitted from the high-reflective surface on the second whiteboard 136; then the image to be tested is processed to obtain the color brightness value of the light emitting surface and the color brightness value of the high-reflective surface.

[0047] Furthermore, the controller 11 can crop the image to be tested to obtain a target image including the projection on the first whiteboard 135 and the projection on the second whiteboard 136; then perform image segmentation on the target image to obtain a light-emitting surface image and a high-reflection surface image, or the projection on the first whiteboard 135 and the projection on the second whiteboard 136 can be photographed separately under the same shooting conditions as the light-emitting surface image and the high-reflection surface image.

[0048] The controller 11 detects the light-emitting surface image and the high-reverse surface image to obtain the color brightness value of the light-emitting surface and the color brightness value of the high-reverse surface. Specifically, the image processing software can be used to crop the image to be tested to obtain the target image, and calculate the color brightness values ​​of the two end faces of the sample 20 to be tested; then the color difference of the light-emitting surface image is calculated according to the color brightness value of the light-emitting surface, and the color difference of the high-reverse surface image is calculated according to the color brightness value of the high-reverse surface.

[0049] After acquiring the color difference of the light-emitting surface image and the color difference of the high-reflection surface image, the controller 11 can calculate the difference between the color difference of the light-emitting surface image and the color difference of the high-reflection surface image, and then determine whether the difference between the color difference of the light-emitting surface image and the color difference of the high-reflection surface image falls within a preset signal strength range.

[0050] It should be noted that the camera device 134 may include a photoelectric sensor to detect the luminous intensity of the light surface and the luminous intensity of the high-reflective surface, and feed back the luminous intensity to the controller 11; the controller 11 can calculate the difference between the luminous intensity of the light surface and the luminous intensity of the high-reflective surface to determine whether the high-reflective surface leaks light.

[0051] For example, the sample 20 to be tested is placed horizontally and powered on, and the light-emitting surface and the high-reflective surface of the sample 20 to be tested emit light. After testing, the data shown in Table 1 are obtained, assuming that the preset signal strength range is -5 to 5.

[0052] Table 1 Color brightness values ​​corresponding to different samples 20 to be tested

[0053]

[0054] As can be seen from Table 1, for the sample A to be tested, the difference between the color difference of its light-emitting surface and the color difference of the high-reflection surface is 4.2, which falls within the preset signal intensity range, so the sample A to be tested has light leakage; at this time, the high-reflection surface of the sample A to be tested can be checked, and the sample A to be tested can be subjected to FIB (focused ion beam, Focused Ion Beam) Beam) peeling test was performed, and after software simulation, it was found that: at the target wavelength of 645nm, the reflectivity of the sample A to be tested was only 49.3%, far lower than the design value of 97.54%, so serious light leakage occurred; similarly, for the sample D to be tested, the difference between the color difference of its light-emitting surface and the color difference of the high-reflective surface was 0.4, which fell within the set preset signal intensity range, so the sample D to be tested also had light leakage; while for the samples B to be tested and the sample C to be tested, the difference between the color difference of their light-emitting surfaces and the color difference of the high-reflective surface did not fall within the preset signal intensity range, and no light leakage occurred; therefore, the test method of this embodiment can detect whether light leakage occurs, which can shorten the troubleshooting time and quickly resume product production.

[0055] In this embodiment, the projection image on the first whiteboard 135 and the projection image on the second whiteboard 136 are obtained by taking photos, and then the color brightness value of the projection image is extracted by using image processing software. The controller 11 then calculates the color difference between the light surface and the high-reflective surface, and determines the difference between the two, thereby determining whether the light-emitting surface and the high-reflective surface of the sample 20 to be tested are abnormal, thereby achieving quality inspection.

[0056] It can be understood that the preset signal strength range may include a first preset signal strength range and a second preset signal strength range, the luminous intensity corresponds to the first preset signal strength range, and the color brightness value corresponds to the second preset signal strength range; specifically, it can be judged that the difference between the luminous intensity of the light output surface and the luminous intensity of the high-reflective surface falls within the first preset signal strength range, and it can be judged that the difference between the color brightness value of the light output surface and the color brightness value of the high-reflective surface falls within the second preset signal strength range; if the difference between the luminous intensity of the light output surface and the luminous intensity of the high-reflective surface falls within the first preset signal strength range, or the difference between the color brightness value of the light output surface and the color brightness value of the high-reflective surface falls within the second preset signal strength range, it is judged that light is leaking from the high-reflective surface.

[0057] Step 35: If the difference between the signal intensity of the light emitting surface and the signal intensity of the high-reflective surface falls within a preset signal intensity range, it is determined that the high-reflective surface of the sample to be tested leaks light.

[0058] Step 36: If the difference between the signal intensity of the light-emitting surface and the signal intensity of the high-reflective surface does not fall within the preset signal intensity range, it is determined that the high-reflective surface of the sample to be tested does not leak light.

[0059] It can be understood that two preset signal strength ranges can also be set: the light-emitting surface signal strength range and the high-reverse surface signal strength range. The light-emitting surface signal strength range and the high-reverse surface signal strength range are the standard signal strengths of the light-emitting surface and the high-reverse surface, respectively. The signal strength of the light-emitting surface is compared with the light-emitting surface signal strength range to determine the quality of the light-emitting surface; and the signal strength of the high-reverse surface is compared with the high-reverse surface signal strength range to determine the quality of the high-reverse surface.

[0060] In this embodiment, the photoelectric sensor 131 can be used to obtain the luminous conditions and color brightness values ​​of the light-emitting surface and the high-reflective surface, so as to judge the quality of the light-emitting surface and the high-reflective surface; or the projection images on the two white boards can be obtained by taking pictures, and the difference between the color differences of the two projection images can be calculated to judge whether the light-emitting surface and the high-reflective surface of the sample 20 to be tested are abnormal, so as to realize quality inspection, quickly find out the problems in the process, and help improve the product yield.

[0061] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A light leakage detection method, applied to a light leakage detection device, characterized in that: The light leakage detection device includes a controller, a programmable power supply and a signal detection device, and the method includes: The controller sends a first control signal to the programmable power supply, so that the programmable power supply outputs a constant preset current to the sample to be tested, wherein the constant preset current is less than a threshold current of the sample to be tested, so that the sample to be tested works in a light emitting diode mode; The controller sends a second control signal to the signal detection device, so that the signal detection device obtains the signal strength of the light-emitting surface and the high-reflecting surface of the sample to be tested; The controller determines whether the difference between the signal strength of the light emitting surface and the signal strength of the high reflective surface falls within a preset signal strength range; If yes, then determining the light leakage of the high-reverse side of the sample to be tested; Wherein, the signal intensity includes luminous intensity and color brightness value, and the sample to be tested includes a laser chip or bar that has not been packaged; The signal detection device includes a photoelectric sensor, a first integrating sphere and a second integrating sphere, wherein the first integrating sphere and the second integrating sphere are respectively used to collect light beams emitted from the light emitting surface and the high-reflection surface, and the method includes: The controller sends the second control signal to the photoelectric sensor, so that the photoelectric sensor collects the intensity of light on the first integrating sphere and the second integrating sphere to obtain the luminous intensity of the light emitting surface and the luminous intensity of the high reflective surface; The signal detection device includes a camera device, a first whiteboard and a second whiteboard, wherein the first whiteboard and the second whiteboard are respectively used to reflect the light beam emitted from the light emitting surface and the light beam emitted from the high-reflection surface, and the method further includes: The controller sends the second control signal to the camera device, so that the camera device takes pictures of the first whiteboard and the second whiteboard to obtain an image to be tested, wherein the image to be tested includes a projection of the light beam emitted from the light emitting surface on the first whiteboard and a projection of the light beam emitted from the high-reflective surface on the second whiteboard; The controller processes the image to be tested to obtain the color brightness value of the light-emitting surface and the color brightness value of the high-reflection surface.

2. The light leakage detection method according to claim 1, characterized in that: The light leakage detection device further includes a probe, and the method further includes: The controller sends a third control signal to the probe, so that the probe inputs the power signal output by the programmable power supply to the sample to be tested.

3. The light leakage detection method according to claim 1, characterized in that: The controller processes the image to be tested to obtain the color brightness value of the light-emitting surface and the color brightness value of the high-reflective surface, comprising: The controller crops the image to be tested to obtain a target image including a projection on the first whiteboard and a projection on the second whiteboard; The controller performs image segmentation on the target image to obtain a light-emitting surface image and a high-reflection surface image; The controller detects the light-emitting surface image and the high-reflection surface image to obtain a color brightness value of the light-emitting surface and a color brightness value of the high-reflection surface.

4. The light leakage detection method according to claim 1, characterized in that: The step of the controller determining whether the difference between the signal strength of the light emitting surface and the signal strength of the high reflective surface falls within a preset signal strength range comprises: The controller calculates the color difference of the light emitting surface according to the color brightness value of the light emitting surface, and calculates the color difference of the high-reflective surface according to the color brightness value of the high-reflective surface; The controller determines whether a difference between the color difference of the light-emitting surface and the color difference of the high-reflection surface falls within the preset signal strength range.

5. The light leakage detection method according to claim 4, characterized in that: The color brightness value includes a brightness value, a range from red to green, and a range from yellow to blue. The controller calculates the color difference using the following formula: Wherein, ΔE is the color difference, L is the brightness value, a is the range from red to green, and b is the range from yellow to blue.

6. The light leakage detection method according to claim 1, characterized in that: The method further comprises: When the difference between the signal intensity of the light-emitting surface and the signal intensity of the high-reflective surface does not fall within the preset signal intensity range, it is determined that the high-reflective surface of the sample to be tested does not leak light.

7. A light leakage detection device, characterized in that: It includes a controller, and a programmable power supply and a signal detection device connected to the controller, the controller is used to send control signals to the programmable power supply and the signal detection device, and receive signals fed back by the signal detection device, the programmable power supply is used to output a constant preset current to the sample to be tested, and the signal detection device is used to obtain the signal strength of the light-emitting surface and the high-reflective surface of the sample to be tested, wherein the signal strength includes luminous intensity and color brightness value, the sample to be tested includes a laser chip or a bar that has not been packaged, and the controller is used to execute the light leakage detection method described in any one of claims 1 to 6.

8. The light leakage detection device according to claim 7, characterized in that: The light leakage detection device also includes a metal platform, which is used to place the sample to be tested, and the metal platform is connected to the programmable power supply through a wire.

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