CN105092216B - Laser diode area array pumping uniformity detection device - Google Patents
Laser diode area array pumping uniformity detection device Download PDFInfo
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- CN105092216B CN105092216B CN201510544211.6A CN201510544211A CN105092216B CN 105092216 B CN105092216 B CN 105092216B CN 201510544211 A CN201510544211 A CN 201510544211A CN 105092216 B CN105092216 B CN 105092216B
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Abstract
The embodiment of the invention discloses a device for detecting the uniformity of a laser diode area array pump, which comprises: a laser diode area array; the optical waveguide is used for homogenizing the pump light emitted by the laser diode area array; the V-shaped reflecting plate is used for reflecting the pump light emitted by the optical waveguide to the two sides of the optical waveguide; the laser transmission optical fiber comprises an optical fiber joint and an optical fiber tail end, wherein the optical fiber joint is fixed on the V-shaped reflector and is used for receiving pump light emitted by the optical waveguide; the driver is used for driving the V-shaped reflecting plate to move relative to the light emitting surface of the optical waveguide in a preset mode; the power meter probe is positioned on the backlight side of the V-shaped reflector and used for detecting the optical power value of emergent light at the tail end of the optical fiber; and the processor is used for receiving the optical power value and analyzing the optical power value according to a preset mode to obtain the uniformity distribution. The embodiment of the invention can quantize the uniformity distribution of a certain light receiving area and has the advantage of higher detection accuracy.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a device for detecting uniformity of a laser diode area array pump.
Background
The semiconductor pumping solid laser has been widely used due to its advantages of small thermal effect, good stability and compact structure. In the 80 s of the 20 th century, with the development of semiconductor laser technology, the performance of a single laser diode is greatly improved, and particularly, the rapid development of a semiconductor array enables a solid laser to be vigorous.
For obtaining high-power and high-beam-quality laser output, a high-power and high-performance pump source becomes a very ideal pumping structure, and a semiconductor array just meets the requirements of people, no matter for a traditional round rod-shaped laser working medium or a lath-shaped laser working medium. Moreover, in order to obtain laser output with high beam quality, we need not only overcome thermal effects such as temperature gradient, thermal lens, stress annealing, etc., but also consider that the pump light enters the working medium more uniformly, however, whether the pump light is uniform or not needs further examination.
In the prior art, the detection of the uniformity of the pump light is mostly a qualitative observation, for example, the fluorescence distribution detection is performed on the light receiving surface to observe the light spot; or the light tracing simulation is carried out by using software, and the detection methods have the problem of low detection result accuracy inevitably.
Disclosure of Invention
The invention mainly solves the technical problem of providing a novel device for detecting the uniformity of pump light, and is a laser diode area array pump uniformity detection device with the characteristic of higher accuracy of detection results.
The embodiment of the invention provides a laser diode area array pumping uniformity detection device, which comprises: a laser diode area array; the optical waveguide is used for homogenizing the pump light emitted by the laser diode area array; the V-shaped reflecting plate is used for reflecting the pump light emitted by the optical waveguide to the two sides of the optical waveguide; the laser transmission optical fiber comprises an optical fiber joint and an optical fiber tail end, wherein the optical fiber joint is fixed on the V-shaped reflector and is used for receiving pump light emitted by the optical waveguide; the driver is used for driving the V-shaped reflecting plate to move relative to the light-emitting surface of the optical waveguide according to a preset mode so that the optical fiber connector receives light at a preset position of the light-emitting surface of the optical waveguide according to the preset mode; the power meter probe is positioned on the backlight side of the V-shaped reflector and used for detecting the optical power value of emergent light at the tail end of the optical fiber; and the processor is used for receiving the optical power value and analyzing the optical power value according to a preset mode to obtain the uniformity.
The V-shaped reflecting plate comprises two reflecting plates forming a V shape, the two reflecting plates are symmetrical relative to a first plane, and the first plane is a plane perpendicular to the light-exiting surface of the optical waveguide.
Wherein, the optical fiber joint is fixed at the central position of the joining direction of the two reflecting plates.
Wherein, there is a light hole on the V-shaped reflector panel, and the optical fiber splice is embedded in the light hole.
The surface of the V-shaped reflecting plate facing the light-emitting surface of the optical waveguide is plated with silver.
The device also comprises two light receiving plates which are respectively arranged at two sides of the optical waveguide and used for receiving the pump light reflected by the V-shaped reflecting plate.
The driver is used for driving the V-shaped reflecting plate to move relative to the light-emitting surface of the optical waveguide line by line and point by point, so that the optical fiber connector receives light at a preset position of the light-emitting surface of the optical waveguide line by line and point by point.
The processor obtains a plurality of optical power values for the light at each preset position of the light-emitting surface of the optical waveguide, and the average value of the plurality of optical power values is used as the optical power value at each preset position.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
The laser diode area array pumping uniformity detection device provided by the embodiment of the invention utilizes the optical waveguide to homogenize the pumping light emitted by the laser diode area array, and utilizes the laser transmission optical fiber, the driver, the power meter probe and the processor to collect the optical power numerical value of the pumping light at a preset position on the light emitting surface of the optical waveguide on the basis of the homogenization of the pumping light emitted by the laser diode area array, so as to obtain the uniformity curve of the pumping light emitted by the optical waveguide; meanwhile, the V-shaped reflector is used for preventing the pump light except the collecting point from entering the power meter probe, and the accuracy of the detection of the power meter probe is guaranteed. Therefore, compared with the prior art, the detection result of the uniformity of the pump light has higher accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a device for detecting uniformity of laser diode area array pumping according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of another embodiment of a device for detecting uniformity of laser diode area array pumping according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a device for detecting uniformity of laser diode area array pumping according to an embodiment of the present invention. As shown in fig. 1, the apparatus 100 for detecting uniformity of laser diode area array pump light includes a laser diode area array 110, an optical waveguide 120, a V-shaped reflector (including a reflector 131 and a reflector 132), a laser transmission fiber (including a fiber connector 141 and a fiber end 142), a driver (not shown), a power meter probe 150, and a processor 160.
specifically, an L D (laser diode) area array may be formed by arranging a plurality of L D stacked arrays in the x direction, the fast axis direction of the laser diode area array is the y direction, and the slow axis direction of the laser diode area array is the x direction.
The optical waveguide 120 is disposed on the light-emitting path of the laser diode area array 110, and is used for homogenizing the pump light emitted from the laser diode area array 110. In this embodiment, since the divergence angle of the laser diode area array 110 in the fast axis direction is large, the pump light emitted from the laser diode area array 110 can be reflected for multiple times on the upper and lower surfaces (i.e., two surfaces parallel to the paper surface) of the optical waveguide 120, thereby realizing the homogenization of the pump light.
In the V-shaped reflector, the reflector 131 and the reflector 132 form a V-shape, and the reflector 131 and the reflector 132 can be connected by various connection methods such as bonding and welding. The optical fiber connector 141 is fixed on the V-shaped reflector and is configured to receive the pump light emitted from the optical waveguide 120. Specifically, a light passing hole may be formed in the V-shaped reflector, and the optical fiber connector 114 is embedded in the light passing hole. The V-shaped light reflecting plate is used for reflecting the pumping light emitted from the optical waveguide 120 to two sides of the optical waveguide 120, so as to prevent the pumping light except the pumping light incident to the optical fiber connector 141 from entering the power meter probe 150 and affecting the detection of the target light by the power meter probe 150. Preferably, the surface of the V-shaped reflector facing the light exit surface of the optical waveguide 120 is plated with silver to improve reflectivity.
The optical fiber connector 141 can be fixed at any position of the V-shaped reflector, and in this embodiment, the optical fiber connector 141 is preferably fixed at a position in the direction of the engagement of the reflector 131 and the reflector 132. In order to improve the symmetry of the product structure, it is more preferable that the light reflecting plate 131 and the light reflecting plate 132 are symmetrical about a first plane, which is a plane perpendicular to the light exiting surface of the light waveguide 120. The optical fiber connector is fixed at the center of the joining direction of the reflector 131 and the reflector 132.
It is understood that in other embodiments, the V-shaped reflector may be a single V-shaped reflector, as long as the pump light except the pump light incident on the optical fiber connector 141 is prevented from being incident on the power meter probe 150.
The driver (not shown) may be a three-dimensional stepper, or may be other driving devices. The driver is used for driving the V-shaped reflecting plate to move relative to the light-emitting surface of the optical waveguide 120 in a predetermined manner, so that the optical fiber connector 141 receives light at a predetermined position of the light-emitting surface of the optical waveguide 120 in a predetermined manner. For example, the driver is configured to drive the V-shaped reflector to move line by line and point by point with respect to the light exit surface of the optical waveguide 120, so that the optical fiber connector 141 fixed to the V-shaped reflector receives light at a predetermined position of the light exit surface of the optical waveguide 120 line by line and point by point. Of course, the driver may also drive the V-shaped light reflecting plate to move relative to the light emitting surface of the light guide 120 in other predetermined manners, for example, the V-shaped light reflecting plate makes a plurality of annular movements gradually increasing or decreasing, or makes a spiral movement gradually increasing or decreasing, or makes an S-shaped movement row by row or column by column, and so on.
The fiber end 142 of the laser transmission fiber is connected with a power meter probe 150, and the power meter probe 150 is located on the backlight side of the V-shaped reflector and is used for detecting the optical power value of the light emitted from the fiber end 142. In this embodiment, the power meter probe 150 does not move with the V-shaped reflector, but is stationary. Of course, in other embodiments, the driver may drive the power meter probe 150 such that the power meter probe 150 moves synchronously with the V-shaped reflector.
The processor 160 is configured to receive the optical power value sent by the power meter probe 150, and analyze the optical power value according to a predetermined manner to obtain uniformity of the pump light emitted from the optical waveguide. The processor 160 may be a computer, and the power meter probe 150 may send the optical power value to the computer through a USB (Universal Serial Bus) or a wireless network.
Preferably, for the light at each predetermined position of the light exit surface of the optical waveguide 120, the processor 160 obtains a plurality of optical power values, and uses the average value of the plurality of optical power values as the optical power value at each predetermined position to improve the detection accuracy. For example, when the optical fiber connector 141 receives light from the light exit surface of the optical waveguide 120 point by point, the processor 160 obtains 500 optical power values when the optical fiber connector 141 scans each point of the light exit surface of the optical waveguide 120, and uses the 500 optical power values as the optical power value of the current scanning point.
For ease of understanding, a specific application of the apparatus 100 for detecting uniformity of laser diode area array pumping is described as follows:
the three-dimensional directions of the optical waveguide 120 are defined as 100mm long in the x direction, 30mm long in the y direction, and 80mm long in the z direction, the sizes of the light reflecting plate 131 and the light reflecting plate 132 are both 220mm × 120mm, the two light reflecting plates are symmetrical about the yz plane, and the included angle between the two light reflecting plates is 80 °.
the driver is a three-dimensional stepper, the V-shaped reflector is controlled by a program to move from the upper left corner of the light-emitting surface of the optical waveguide 120, so that the optical fiber connector 141 moves from the upper left corner of the light-emitting surface of the optical waveguide 120, and at the same time, the computer 160 records the optical power value sent by the power meter probe 150, the computer 160 collects data of one point every time the optical fiber connector 141 moves 1mm in the x-axis direction, for each point, the computer 160 collects 100 data, and takes the average value of the 100 data as the optical power value of the point, the x-direction of the optical waveguide 120 is 100mm long, so that a line of the optical fiber connector 141 is scanned for 100 points in total, and the optical fiber connector 141 continues scanning along the y-axis after the collection is finished, and until the data of each line in the y-axis direction is collected, the data of 100 × 30 ═ 3000 points is counted, and finally, the computer 160 fits the distribution curve of the optical power values of all points in the light-emitting surface (i.e., xy-plane) of the optical.
Therefore, in the device for detecting the pumping uniformity of the laser diode area array of the embodiment, the pumping light emitted by the laser diode area array is homogenized by using the optical waveguide, and on the basis, the optical power value of the pumping light at a preset position on the light emitting surface of the optical waveguide is collected by using the laser transmission optical fiber, the driver, the power meter probe and the processor, so that the uniformity curve of the pumping light emitted by the optical waveguide is obtained; meanwhile, the V-shaped reflector is used for preventing the pump light except the collecting point from entering the power meter probe, and the accuracy of the detection of the power meter probe is guaranteed. Therefore, compared with the prior art, the detection result of the uniformity of the pump light has higher accuracy.
Example two
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a device for detecting uniformity of laser diode area array pumping according to an embodiment of the present invention. As shown in fig. 2, a device 200 for detecting uniformity of laser diode area array pumping includes a laser diode area array 210, an optical waveguide 220, a V-shaped reflector (including a reflector 231 and a reflector 232), a laser transmission fiber (including a fiber connector 241 and a fiber end 242), a driver (not shown), a power meter probe 250, and a processor 260.
The difference between the present embodiment and the first embodiment includes:
1. The device 200 for detecting the pumping uniformity of the laser diode area array further comprises a water cooling machine 270, which is used for carrying out heat dissipation treatment on the laser diode area array 210 and is particularly suitable for high-power laser diode area arrays.
2. The device 200 for detecting uniformity of laser diode area array pumping further comprises two light receiving plates 281 and 282 respectively disposed on two sides of the optical waveguide 220. The light receiving plate 281 is located on the light outgoing path of the light reflecting plate 231 and is configured to receive the pump light reflected by the light reflecting plate 231; the light receiving plate 282 is located on the light outgoing path of the reflection plate 232, and is used for receiving the pump light reflected by the reflection plate 232. In the case where the laser diode area array 210 is a high-power light source, the light reflected by the V-shaped reflector is easily harmful to people, and therefore, the light receiving plates 281 and 282 may be disposed to avoid the damage problem. Since the light receiving plates 281 and 282 absorb a large amount of heat, the heat radiation process may also be performed on the light receiving plates.
Compared with the first embodiment, the embodiment has the advantages of the first embodiment, and in the embodiment, because the light receiving plate is arranged to receive the pump light reflected by the V-shaped reflector, the high-power light reflected by the V-shaped reflector can be prevented from causing harm to people, and the safety is higher.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. The utility model provides a laser diode area array pumping homogeneity detection device which characterized in that includes:
A laser diode area array;
The optical waveguide is used for carrying out homogenization treatment on the pump light emitted by the laser diode area array, and the laser diode area array is used for emitting the pump light;
The V-shaped reflecting plate is used for reflecting the pumping light emitted by the optical waveguide to the two sides of the optical waveguide, and comprises two reflecting plates forming a V shape, wherein the two reflecting plates are symmetrical relative to a first plane, and the first plane is a plane vertical to the light emitting surface of the optical waveguide;
The laser transmission optical fiber comprises an optical fiber joint and an optical fiber tail end, wherein the optical fiber joint is fixed on the V-shaped reflecting plate and used for receiving the pump light emitted by the optical waveguide, and the optical fiber joint is fixed at the central position of the joining direction of the two reflecting plates;
The driver is used for driving the V-shaped reflecting plate to move relative to the light-emitting surface of the optical waveguide according to a preset mode, so that the optical fiber connector receives light at a preset position of the light-emitting surface of the optical waveguide according to the preset mode;
The power meter probe is positioned on the backlight side of the V-shaped reflector and used for detecting the optical power value of emergent light at the tail end of the optical fiber;
A processor for receiving the optical power value and analyzing the optical power value according to a predetermined manner to obtain the uniformity;
The V-shaped reflector is provided with a light through hole, and the optical fiber connector is embedded in the light through hole;
The surface of the V-shaped reflector facing the light-emitting surface of the optical waveguide is plated with silver;
The device also comprises two light receiving plates which are respectively arranged at two sides of the optical waveguide and used for receiving the pump light reflected by the V-shaped reflecting plate.
2. The apparatus as claimed in claim 1, wherein the driver is configured to drive the V-shaped reflector to move row by row and point by point with respect to the light exit surface of the optical waveguide, so that the optical fiber connector receives light at a predetermined position of the light exit surface of the optical waveguide row by row and point by point.
3. The apparatus as claimed in claim 1, wherein the processor obtains a plurality of optical power values for each predetermined position of the light from the light exit surface of the optical waveguide, and uses an average value of the plurality of optical power values as the optical power value for each predetermined position.
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| CN201510544211.6A CN105092216B (en) | 2015-08-29 | 2015-08-29 | Laser diode area array pumping uniformity detection device |
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| CN201510544211.6A CN105092216B (en) | 2015-08-29 | 2015-08-29 | Laser diode area array pumping uniformity detection device |
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| CN105092216B true CN105092216B (en) | 2020-08-07 |
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| CN103323000B (en) * | 2013-05-22 | 2016-05-25 | 上海新跃仪表厂 | Digital sun sensor sunlight lead and framework junction part thereof and installation method |
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