CN109580189B - Automatic focal length measuring device for laser diode and measuring method thereof - Google Patents
Automatic focal length measuring device for laser diode and measuring method thereof Download PDFInfo
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Abstract
The application discloses an automatic focal length measuring device for a laser diode and a measuring method thereof, wherein the automatic focal length measuring device comprises the following steps: the measuring module is used for measuring the optical power of the laser diode to be measured, which is coupled into the coupling component; a motion coupling mechanism for moving the coupling member; the upper computer is used for controlling the movement of the coupling component to measure the maximum coupling light power value of the coupling component and the laser diode to be measured in the X-Y plane under any Z-axis coordinate, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be measured according to the measurement result and the position coordinate of the coupling component; the upper computer is respectively and electrically connected with the measuring module and the motion coupling mechanism. The device realizes automatic and accurate measurement of the focal length and the space deflection angle of the TO-LD or the LD. The application also provides a measuring method of the device.
Description
Technical Field
The application relates to an automatic focal length measuring device and a measuring method for a Laser Diode (LD), belonging to the field of optical device testing.
Background
At present, an LD (Laser Diode) packaged by a TO (Transistor Outline ) is called a TO-LD for short, and due TO physical deviation and TO ball lens difference in the packaging process, focal length deviation and space deviation angle of emergent light can be caused. In the field of optical communication, measuring the LD focal length and deflection angle of an active optical device is an important means for testing and analyzing the active optical device.
In the existing production process, accurate beam focal length parameters of each TO-LD cannot be provided in real time. The TO-LD, which has been assembled, can only be measured by manual coupling means, and the measured parameters include the focal length range TO which the TO-LD refers.
The manual focal length coupling measurement includes the steps of: firstly, a specific current is connected TO the TO-LD, and then the maximum light intensity of the single-mode optical fiber coupled TO different distances in the luminous direction of the LD is searched by a manual coupling table, so that the focal length of the TO-LD is determined.
The manual coupling measurement method has low test efficiency, poor measurement precision and complicated personnel operation, and can not quickly and efficiently test the LD with the focal length and deflection angle exceeding the limit, so that the production efficiency of the subsequent packaging process is affected, and the production cost is increased.
Disclosure of Invention
According TO an aspect of the present application, there is provided an automatic focal length measuring apparatus for a laser diode, which enables automatic accurate measurement of focal length and spatial deflection angle of a TO-LD or LD.
The automatic focal length measuring device for the laser diode is characterized by comprising a measuring module and a control module, wherein the measuring module is used for measuring the optical power of the laser diode to be measured, which is coupled into the coupling component;
a motion coupling mechanism for moving the coupling member;
The upper computer is used for controlling the coupling component to move so as to measure the maximum coupling light power value of the coupling component and the laser diode to be measured in an X-Y plane under any Z-axis coordinate, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be measured according to the measurement result and the position coordinate of the coupling component;
the upper computer is respectively and electrically connected with the measuring module and the motion coupling mechanism.
The device provided by the invention inputs a control instruction through the upper computer, and realizes the automatic control of the motion coupling mechanism to measure the conducted LD to be measured. And the measured data can be returned to an upper computer for processing, and can also be processed by an external computing device, so that parameters such as focal length and the like of the LD to be measured are obtained. Here, the LD light emitting direction is taken as the Z axis, and the plane perpendicular to the Z axis is taken as the plane enclosed by the X axis and the Y axis.
Optionally, the coupling component comprises a coupling fiber or a photodetector; the coupling optical fiber can be a single-mode optical fiber or a multimode optical fiber; the photodetector may be a photodetector with a spatial filtering function.
Preferably, the measurement module is a multifunctional digital source meter and is used for supplying power to the laser diode to be measured.
Optionally, the automatic focal length measuring device for the laser diode includes a gating circuit module, which is used for controlling the on or off of the circuit of each laser diode to be measured according to the control instruction of the upper computer, and the gating circuit module is in control connection with the upper computer and is in circuit connection with the laser diode to be measured.
Through the module, batch measurement of a plurality of LDs can be realized, and energy waste caused by simultaneous power-on is avoided.
Optionally, the kinematic coupling mechanism includes: a first moving mechanism, a limiting mechanism and a coupling mechanism,
The coupling mechanism is arranged on the first moving mechanism and moves along with the first moving mechanism;
The laser diode to be tested is fixedly arranged in the limiting mechanism;
The coupling component is arranged on the coupling mechanism;
The coupling mechanism drives the coupling component to move and is coupled with the laser diode to be tested.
The first moving mechanism is used for realizing three-dimensional movement of the coupling component relative to the LD to be measured, comprises X, Z, Y three-dimensional movement, is convenient for adjusting the position of the coupling component relative to the LD to be measured according to the measurement requirement, and is convenient for measurement.
Optionally, the limiting mechanism includes: the laser diode to be tested is arranged in the LD socket mounting hole, and the upper positioning plate is provided with at least one LD positioning hole opposite to the LD socket mounting hole;
after the laser diode to be tested is clamped and fixed by the base and the upper positioning plate, the measuring end of the laser diode to be tested is at least accommodated in the LD positioning hole.
The measuring end of the LD to be measured after installation can extend out of the LD positioning hole or not, and only the measurement can be ensured to be completed.
Optionally, the limiting mechanism includes: the socket rebound member is sleeved outside the LD socket and is compressed and accommodated between the LD socket and the base;
the laser diode to be tested is arranged in the LD socket;
Preferably, positioning columns are respectively arranged at two ends of the top surface of the base, positioning holes are formed in the upper positioning plate and are opposite to the positioning columns, and the positioning columns are inserted into the positioning holes to limit the movement of the upper positioning plate along the horizontal direction of the upper positioning plate.
Optionally, the limiting mechanism includes: the base support is arranged at two opposite ends of the base respectively;
the height limiting mechanisms are respectively arranged on two opposite ends of the base, and clamp and control the upper positioning plate to move longitudinally along the upper positioning plate.
Optionally, the height limiting mechanism is an air-compression corner cylinder and/or a buckle;
preferably, the buckle comprises: the clamping device comprises a clamping head, a clamping seat, a clamping shaft and a clamping spring, wherein the clamping shaft transversely penetrates through the clamping seat and the clamping head along the clamping seat;
The clamping head is arranged in the clamping seat and rotates around the clamping shaft;
The buckle spring is compressed and accommodated between the buckle head and the buckle seat, and pushes the buckle head to rotate around the buckle shaft;
One side of the clamping head is abutted against one end of the upper positioning plate.
The inner side of the buckle seat is provided with a structure for limiting the rotation range of the buckle head; the limiting structure can be a step surface.
Optionally, the coupling mechanism includes: the support faces the limiting mechanism and is arranged on the first moving mechanism, and the support is provided with a coupling part mounting hole.
According to a further aspect of the present application there is provided a measurement method for an apparatus as described above, comprising the steps of:
a) Fixing and conducting a laser diode to be tested, and moving a coupling component to the light emitting side of the laser diode to be tested;
b) Moving the coupling component, and measuring the maximum coupling light power value of the coupling component and the laser diode to be tested and the position coordinate of the coupling component in an X-Y plane under any Z-axis coordinate;
c) Updating the Z-axis coordinate, repeating the step b) until the test termination condition is reached, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be tested.
The application has the beneficial effects that:
1) The automatic focal length measuring device for the laser diode provided by the application realizes more accurate space positioning of the LD, and avoids repositioning the space position of the LD each time when the focal length of the LD is manually measured.
2) The automatic focal length measuring device for the laser diode provided by the application can simultaneously realize batch accurate measurement of the focal lengths of a plurality of LD, is simple to operate, and can finish the test by operating an upper computer only by carrying out upper and lower materials and outputting the result. The dependence on the skill proficiency of operators is reduced, and the accuracy and the efficiency of the test are improved.
3) The automatic focal length measuring device for the laser diode provided by the application has the advantages that the focal length testing precision error of the device is +/-20 microns, the single testing time is less than 30s, the measuring efficiency is greatly improved, and the batch continuous measurement of a plurality of LD can be realized.
Drawings
FIG. 1 is a schematic diagram of an automatic focal length measuring device for a laser diode according to an embodiment of the present application;
FIG. 2 is a schematic perspective view of a kinematic coupling mechanism according to an embodiment of the present application;
FIG. 3 is a schematic perspective view of a kinematic coupling mechanism according to another embodiment of the present application;
FIG. 4 is a schematic diagram showing an explosion effect of an LD limit mechanism in one embodiment of the present application;
fig. 5 is a schematic diagram illustrating an explosion effect of a buckle according to an embodiment of the present application.
List of parts and reference numerals:
| Part name | Reference numerals | Part name | Reference numerals |
| Three-dimensional electric displacement mechanism | 100 | X-axis positioning block | 110 |
| Optical fiber support | 2 | X-axis sliding block | 120 |
| Coupling optical fiber | 3 | Y-axis sliding block | 130 |
| Air-compression corner cylinder | 4 | Z-axis positioning block | 140 |
| Upper positioning plate | 5 | Z-axis sliding block | 150 |
| Base seat | 6 | LD socket mounting hole | 610 |
| Base support | 7 | Detector support | 210 |
| LD positioning hole | 8 | Photoelectric detector | 220 |
| LD | 9 | Buckle | 230 |
| LD socket | 10 | Fastening head | 15 |
| Socket spring | 11 | Buckle seat | 16 |
| Positioning column | 12 | Buckle axle | 17 |
| Positioning hole | 13 | Buckle spring | 18 |
| Bottom plate | 14 | Buckle seat | 16 |
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Referring to fig. 1, the automatic focal length measuring device for a laser diode provided by the present invention includes: the system comprises a motion coupling mechanism, a motion controller (the motion controller in the block diagram can control the three-dimensional electric displacement mechanism 100 to move through a computer), a gating circuit module, a multifunctional digital source meter and an upper computer.
The upper computer is provided with an automatic focal length coupling control program, and respectively establishes communication with the motion controller, the gating circuit module and the multifunctional digital source table in a wired or radio connection mode for transmitting data and control instructions. The upper computer sends a motion instruction to the motion controller to control the motion coupling mechanism to drive the coupling optical fiber 3 to perform spatial position transformation near the laser diode to be tested.
Herein, the transmission objects of the electrical connection are signals, data, control instructions, current voltage, and the like.
The upper computer is also used for sending an output current control instruction to the multifunctional digital source meter and providing appointed working current for the laser diode to be tested. The upper computer is also used for sending a gating instruction to the circuit gating circuit module, and switching on a power supply circuit of the laser diode to be tested so as to realize the one-by-one power-on measurement of the laser diode to be tested. The upper computer is also used for sending a measurement instruction to the multifunctional digital source meter, reading the optical power of the laser diodes to be measured, which is measured by the multifunctional digital source meter, and calculating the focal length of each laser diode to be measured according to the spatial distribution condition of the optical power, which is measured.
The multifunctional digital source meter supplies power to the gating circuit module. And according to the control instruction, the gating circuit module supplies constant current to the laser diode to be tested. The gating circuit module is provided with a plurality of output channels, each channel can be connected with an LD, and the on-off control of each channel is implemented according to the received upper computer instruction. LD generally requires constant current power.
Optionally, the multifunctional digital source meter has a built-in photodetector, which can be directly connected to an optical fiber for measuring the intensity of light coupled into the optical fiber. The multifunctional digital source meter is also provided with an external binding post, and by connecting an external photoelectric detector 220, a pinhole is arranged at the front end of the multifunctional digital source meter, so that the space limiting effect of an optical fiber is replaced, and the intensity of light coupled to the photoelectric detector 220 through the pinhole is measured.
The multifunctional digital source meter is communicated with the upper computer, the numerical value of the output current or voltage is configured through the instruction of the upper computer, and various data such as the measured current, voltage or optical power are transmitted to the upper computer.
The motion controller can be communicated with the upper computer, controls the three-dimensional motion mechanism to move according to the motion instruction of the upper computer, and optionally, controls the motion condition of the air rotation angle cylinder 4 by controlling the on-off of the pneumatic electromagnetic valve.
Referring to fig. 2 to 3, the kinematic coupling mechanism includes a three-dimensional electric displacement mechanism 100, a coupling mechanism, and a limiting mechanism.
The three-dimensional electric displacement mechanism 100 can drive the coupling optical fiber 3 to perform three-dimensional movement. The motion direction comprises X, Y, Z shafts, so that two-dimensional motion in the horizontal direction and lifting motion in the height direction can be realized.
The coupling mechanism generally comprises a coupling optical fiber 3 and an optical fiber support 2, and can also comprise a photoelectric detector 220 with spatial filtering and a detector support 210, wherein the coupling optical fiber 3 couples light rays in a tiny region of a spatial position along with the movement of the coupling mechanism.
When the coupling optical fiber 3 is used, referring to fig. 2, the diameter of the coupling optical fiber 3 is smaller than 20 micrometers, the coupling optical fiber 3 is arranged on the optical fiber support 2, (the connection mode is FC connector, SMA connector or directly inserting core, etc.), one end of the coupling optical fiber 3 is coupled with light emitted by LD, and the other end is connected with a built-in photoelectric detector 220 of the multifunctional digital source meter. Thereby realizing the measurement of the optical power coupled into the optical fiber.
Referring to fig. 3, the photodetector 220 with a spatial filter refers to a photodetector 220 having micropores at the light incident end, wherein the diameter of the micropores is smaller than 20 micrometers; the coupling angle is less than 15 degrees, i.e., the angle between the light and the axis is less than 15 degrees, so that the light can strike the photodetector 220 through the micro-aperture. The photodetector 220 is connected with the multifunctional digital source meter through a wire.
And the limiting mechanism is used for installing and fixing the laser diode to be tested and accurately limiting the position of the laser diode to be tested in space. The positive and negative electrodes of each laser diode to be tested are respectively communicated with a multifunctional digital source meter (multifunctional current source meter) through wires.
The limiting mechanism is used for inserting the LD and pressing the LD on the upper positioning plate 5 so as to precisely position the space position of the LD. The limiting mechanism can be provided with one or more LD stations according to the requirement, and the stations can be distributed in a straight line or in a two-dimensional array.
Referring to fig. 4, the limit mechanism comprises an upper locating plate 5, a base6 bracket, an LD socket 10, a socket spring 11 and a height limit device. The two ends of the base6 are respectively provided with a base6 bracket. The base6 is fixedly connected to the middle of the base6 bracket. The chassis 6 is provided with a plurality of LD socket mounting holes 610 penetrating the chassis 6 in the longitudinal direction thereof. The height limiting devices are respectively arranged on the base6 support and are used for controlling the longitudinal height of the upper locating plate 5. For example, it may be an air-operated corner cylinder 4 or a catch 230. The positioning column 12 is mounted on the top surface of the bracket of the base6, is vertical to the bracket of the base6 upwards, and is used for being matched with the positioning hole 13 on the upper positioning plate 5 to limit the movement of the upper positioning plate 5 in the horizontal direction. The upper positioning plate 5 is provided with LD positioning holes 8 which can accommodate the extension of the LD and are opposite to the LD socket mounting holes 610. For better fixation of the LD, an LD socket 10, a socket spring 11 are also provided.
The support of the base 6 is provided with positioning columns 12, the upper positioning plate 5 is provided with positioning holes 13, and the number of the positioning columns 12 and the number of the positioning holes 13 are the same and are generally more than or equal to 2; the two cooperate to define the position of the upper positioning plate 5 in the horizontal plane.
The upper positioning plate 5 is further provided with a plurality of LD positioning holes 8, and the LD positioning holes 8 can define the position of each LD on the horizontal plane. The height limiting device is typically a buckle 230 or an air-compressed corner cylinder 4, and is used for limiting the height position of the upper positioning plate 5.
When in use, after the laser diode to be tested is assembled, the upper locating plate 5 is covered, the LD socket 10 is pressed down for a certain distance by the upper locating plate 5, and then the position of the upper locating plate 5 is locked by the height limiting device. In this state, the upward elastic force of the LD socket 10 presses the LD against the upper positioning plate 5, so that the height of the LD can be precisely determined and the vertical direction of the LD can be ensured.
The limiting mechanism is also provided with a lead wire for leading out the anode and the cathode of the LD and connecting an external power supply.
According to a further aspect of the present application there is provided a measurement method for an apparatus as described above, comprising the steps of:
a) Fixing and conducting a laser diode to be tested, and moving a coupling component to the light emitting side of the laser diode to be tested;
b) Moving the coupling component, and measuring the maximum coupling light power value of the coupling component and the laser diode to be tested and the position coordinate of the coupling component in an X-Y plane under any Z-axis coordinate;
c) Updating the Z-axis coordinate, repeating the step b) until the test termination condition is reached, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be tested.
By adopting the method, the optical power distribution of the LD to be measured can be obtained by only measuring the optical power coupled into the coupling component, so that parameters such as the focal length of the LD to be measured can be measured with high efficiency.
The test termination condition is to complete the measurement of the Z-axis coordinate data of the required scan. And obtaining a plurality of groups of data sets with Z-axis coordinates corresponding to the maximum optical power one by one, obtaining the optical power spatial distribution of the laser diode to be tested according to the obtained data set test data by the existing method, and obtaining the focal length and the spatial deflection angle of the laser diode to be tested according to the optical power spatial distribution.
The automatic focal length measuring device for the laser diode operates as follows:
Under any Z-axis height, the coupling component horizontally moves along the X-Y plane until reaching the maximum coupling optical power of the X-Y plane under the Z-axis height, stopping moving and recording the optical power value and the position coordinate under the position;
then updating the Z-axis height of the coupling component, and repeatedly horizontally moving the coupling component to obtain the position of the maximum coupling optical power on the X-Y plane and a specific optical power value under the Z-axis height;
And repeating the above process to obtain a series of position coordinates of maximum coupling light power and corresponding light power values.
Calculating to obtain the focal length of the LD to be measured by analyzing the optical power value corresponding to the Z-axis information in the position coordinates; analyzing the position information of the maximum coupled light powers of different heights can determine the actual optical axis direction, i.e., the spatial deviation angle of the LD.
Example 1
In this embodiment, the device is shown in fig. 1-2, and is used for an automatic focal length measuring device of a laser diode, and the automatic focal length measuring device comprises an upper computer, a motion controller, a gating circuit module, a multifunctional digital source meter, a unit electric displacement mechanism, a limiting mechanism and a coupling mechanism.
And installing a program required by control in the upper computer. The upper computer is respectively connected with the motion controller, the gating circuit module and the multifunctional digital source meter. The motion controller is in control connection with the motion coupling mechanism. The gating circuit module outputs current to the laser diodes to be tested and conducts the laser diodes to be tested. The multifunctional digital source meter is used to supply a constant current operating current to the LD and to measure the optical power coupled into the coupling fiber 3.
The motion coupling mechanism comprises a three-dimensional electric displacement mechanism 100 for driving the coupling optical fiber 3 to move and a limiting mechanism for positioning the laser diode to be tested. The three-dimensional electric displacement mechanism 100 is provided with a coupling mechanism for fixedly coupling the optical fiber 3, and in this embodiment, the coupling mechanism includes the coupling optical fiber 3 and the optical fiber holder 2. In other embodiments, the coupling mechanism may also include a spatially filtered photodetector 220 and a detector support 210.
The multifunctional digital source meter is in data connection with the upper computer, the power which is obtained by measuring and is coupled to the coupling optical fiber 3 at different positions is transmitted to the upper computer, and the optical power value spatial distribution is obtained by calculation.
Referring to fig. 2, the kinematic coupling mechanism includes: an X-axis positioning block 110, an X-axis sliding block 120, a Y-axis sliding block 130, a Z-axis positioning block 140 and a Z-axis sliding block 150. The X-axis slider 120 slides on the X-axis positioning block 110 in the X-axis direction. The Z-axis positioning block 140 slides on the Z-axis slider 150 in the Z-axis direction. The Y-axis slider 130 slides the X-axis slider 120 on the top surface of the X-axis slider 120 in the Y-axis direction. The X-axis slider 120, the Y-axis slider 130, and the Z-axis slider 150 realize three-dimensional positional movement of the coupling optical fiber 3 on the X-Y-Z axis by the above-described sliding. A third bracket is disposed on the outer side of the Z-axis slider 150, and is used for fixing the coupling optical fiber 3 and driving the coupling optical fiber 3 to move. The X-axis positioning block 110 is mounted on the base plate 14.
Referring to fig. 2 and 4, the limiting mechanism includes a base 6, an air-compression corner cylinder 4 and an upper positioning plate 5. The air compression corner cylinders 4 are respectively arranged at two ends of the base 6. The base bracket 7 is respectively installed at the both ends of base 6, and the air pressure corner jar 4 is installed on base bracket 7.
The top surface of the base 6 is provided with a plurality of LD socket mounting holes 610. Positioning columns 12 for fixing the position of the upper positioning plate 5 are symmetrically arranged at two ends of the top surface of the base 6. In this embodiment, the positioning posts 12 are oriented vertically up the base 6. The two ends of the upper locating plate 5 are respectively provided with locating holes 13 matched with the locating columns 12. The upper locating plate 5 is provided with a plurality of locating holes 8 between the locating holes 13 at two ends for fixing one end of the LD9 so as to be conveniently coupled with the coupling optical fiber 3. For fixing the LD, an LD socket 10 and a socket spring 11 are also provided. The socket spring 11 is sleeved on the outer wall of the LD socket 10, and the LD9 is inserted into the LD socket 10 and fixed. When assembled, the LD is first inserted into the LD receptacle 10 and fixed. The socket spring 11 is then sleeved on the LD socket 10, and after the socket spring 11 is compressed, the upper positioning plate 5 is covered. The two ends of the upper locating plate 5 are respectively connected with air compression corner cylinders 4 arranged at the two ends of the base 6. The upper locating plate 5 moves up and down under the control of the air-compressing corner cylinder 4, and meanwhile, due to the socket spring 11, the LD can be always abutted on the upper locating plate 5.
The measurement process is as follows:
1. initializing: opening an automatic focal length test program on the upper computer, clicking a key of 'connecting equipment', enabling the upper computer to establish communication with the motion controller and the multifunctional digital source table, enabling the gating circuit module to initialize equipment;
1.1 return motion: the motion controller is initialized to control the three-dimensional electric displacement mechanism to move to a physical zero position and control the air compression corner cylinder to return to an initial state;
1.2 initializing a multifunctional digital source table into a cross flow output mode of specified current;
1.3 the gating circuit module initializes all outputs to an off mode.
2. Resetting: then clicking a reset button, and returning the motion coupling mechanism to a reset state;
the motion controller executes a reset command to control the three-dimensional electric displacement mechanism to move to a specified spatial position;
3. installing a laser diode to be tested: inserting the laser diodes to be tested into the LD sockets of the upper positioning plate, and sleeving the positioning holes of the upper positioning plate on the positioning columns of the base, wherein the LD positioning holes of the upper positioning plate are sleeved on the laser diodes to be tested;
4. LD positioning: clicking a test button, firstly, controlling an air compression corner cylinder by a motion controller to execute a rotary pressing action, and pressing an upper positioning plate onto a second bracket;
at this time, the socket spring is compressed, and the generated elastic force compresses the LD on the upper positioning plate;
5. moving the coupling fiber to measure: the three-dimensional electric displacement mechanism moves the coupling optical fiber to a position right above the first laser diode to be measured by a designated height;
The gating circuit module sets the first path of output to be in a conducting state, so that the first laser diode to be tested is connected with the circuit and is in a light-emitting state. And then controlling the three-dimensional electric displacement mechanism to move, controlling the coupling optical fiber arranged on the third bracket to longitudinally move along the motion controller, and changing the spatial position of the coupling optical fiber. After the position of the coupling optical fiber is changed once, the multifunctional digital source meter executes a power measurement, and after the measurement is completed, the next space position change is executed.
Acquiring optical power values of the coupling optical fibers at different spatial positions, and calculating the focal length of the laser diode to be tested according to the optical power value distribution conditions of the different spatial positions; and fitting the space position coordinates of the maximum light power values at different heights into a space straight line, wherein the included angle between the straight line and the Z axis is the space deflection angle of the LD.
After the first LD test is completed, the upper computer controls the coupling optical fiber to move to a designated height right above the next LD, the gating circuit module sets the first path of output to be in a disconnected state, the second path of output to be in a conducting state, power is supplied to the second laser diode to be tested, the step 5 is repeated, the light power value distribution condition of the second laser diode to be tested is obtained, and the focal length is calculated.
And the laser diodes to be tested at the subsequent LD positioning holes are sequentially and repeatedly tested by the previous testing operation, so that the testing of all the stations LD is completed.
After all the tests are executed, the program automatically returns the test coupling mechanism to a reset state and waits for the next test operation to be executed.
Example 2
In this embodiment, as shown in fig. 1 to 2, the automatic focal length measuring device for a laser diode is different from embodiment 1 in that: the third support is replaced with a photodetector support. And a photoelectric detector with spatial filtering is arranged on the photoelectric detector support. The air pressure corner cylinder 4 is replaced with a catch 230.
Referring to fig. 5, the buckle 230 is mounted on the base. The buckle 230 includes: the snap head 15, the snap seat 16, the snap shaft 17 and the snap spring 18. One side of the buckling head 15 is clamped on the buckling seat 16, and the joint of the buckling head 15 and the buckling seat 16 transversely penetrates through the buckling seat 16 along the buckling direction to be inserted with the buckling shaft 17. The snap head 15 rotates about a snap shaft 17. Both ends of the buckle spring 18 are respectively abutted on the buckle head 15 and the buckle seat 16, and are extruded by the buckle head 15 to be compressed in the mounting hole of the buckle seat 16. The outer end face of the buckling head 15 close to the upper part is abutted against two ends of the upper positioning plate.
The measurement procedure differs from example 1 in that:
the buckle spring 18 presses the buckle head 15, and the buckle head 15 rotates around the buckle shaft 17 and presses the upper positioning plate, thereby fixing the upper positioning plate.
The three-dimensional electric displacement mechanism drives the photoelectric detectors arranged on the three-dimensional electric displacement mechanism to measure the fixed laser diodes to be measured one by one. The laser diode to be measured is in a conducting current state during each measurement, the space position of the photoelectric detector with the space filtering is continuously moved, and the intensity of light entering the photoelectric detector through the micropore, namely the light power at the space position of the micropore, is measured. The measurement procedure was the same as in example 1. In this embodiment, the external detector is used to directly irradiate light at a certain position in space onto the detector, and micropores (PinHole) are arranged in front of the detector to limit light at a tiny position in space to be incident onto the detector.
And uploading the measured data to an upper computer, and then calculating the distribution condition of the optical power values of the laser diodes to be measured along the Z axis, so as to analyze and calculate the focal length. According to the obtained spatial distribution of the highest light power values at different Z-axis heights, fitting the spatial position coordinates into a straight line, and calculating the included angle between the straight line and the Z-axis to obtain the spatial deflection angle of each laser diode to be tested.
The calculation of the deflection angle and the focal length in examples 1 and 2 was performed in accordance with the conventional method.
While the application has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application, and it is intended that the application is not limited to the specific embodiments disclosed.
Claims (6)
1. An automatic focal length measuring device for a laser diode, comprising:
the measuring module is used for measuring the optical power of the laser diode to be measured, which is coupled into the coupling component;
a motion coupling mechanism for moving the coupling member;
The upper computer is used for controlling the coupling component to move so as to measure the maximum coupling light power value of the coupling component and the laser diode to be measured in an X-Y plane under any Z-axis coordinate, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be measured according to the measurement result and the position coordinate of the coupling component;
The upper computer is respectively and electrically connected with the measuring module and the motion coupling mechanism;
The kinematic coupling mechanism includes: a first moving mechanism, a limiting mechanism and a coupling mechanism,
The coupling mechanism is arranged on the first moving mechanism and moves along with the first moving mechanism;
The laser diode to be tested is fixedly arranged in the limiting mechanism;
The coupling component is arranged on the coupling mechanism;
the coupling mechanism drives the coupling component to move and is coupled with the laser diode to be tested;
The limit mechanism comprises: the device comprises a base, an upper locating plate, an LD socket, a socket rebound member, a base bracket and a height limiting mechanism;
the base is provided with at least one LD socket mounting hole, the laser diode to be tested is mounted in the LD socket mounting hole, and the upper positioning plate is provided with at least one LD positioning hole opposite to the LD socket mounting hole;
after the laser diode to be tested is clamped and fixed by the base and the upper positioning plate, the measuring end of the laser diode to be tested is at least accommodated in the LD positioning hole;
The socket rebound member is arranged outside the LD socket and is compressed and accommodated between the LD socket and the base; the laser diode to be tested is arranged in the LD socket; positioning columns are respectively arranged at two ends of the top surface of the base, positioning holes are formed in the upper positioning plate and are opposite to the positioning columns, and the positioning columns are inserted into the positioning holes to limit the movement of the upper positioning plate along the horizontal direction;
the base support is arranged at two opposite ends of the base respectively;
The height limiting mechanisms are respectively arranged on two opposite ends of the base, and clamp and control the upper positioning plate to move longitudinally along the upper positioning plate;
The height limiting mechanism is a buckle;
the buckle includes: the clamping device comprises a clamping head, a clamping seat, a clamping shaft and a clamping spring, wherein the clamping shaft transversely penetrates through the clamping seat and the clamping head along the clamping seat;
The clamping head is arranged in the clamping seat and rotates around the clamping shaft;
The buckle spring is compressed and accommodated between the buckle head and the buckle seat, and pushes the buckle head to rotate around the buckle shaft;
The inner side of the buckle seat is provided with a structure for limiting the rotation range of the buckle head;
One side of the clamping head is abutted against one end of the upper positioning plate.
2. The automatic focal length measuring device for laser diode of claim 1, wherein the coupling means includes a coupling optical fiber or a photodetector.
3. The automatic focal length measuring device for laser diode of claim 1, wherein the measuring module is a multifunctional digital source meter for supplying power to the laser diode under test.
4. The automatic focal length measuring device for laser diode according to claim 1, wherein the automatic focal length measuring device for laser diode comprises a gating circuit module for controlling the on or off of the circuit of each laser diode to be measured according to the control instruction of the upper computer, and the gating circuit module is in control connection with the upper computer and is in circuit connection with the laser diode to be measured.
5. The automatic focal length measuring device for laser diode as claimed in claim 1, wherein the coupling mechanism includes: the support faces the limiting mechanism and is arranged on the first moving mechanism, and the support is provided with a coupling part mounting hole.
6. A measurement method for the automatic focal length measuring device for laser diode according to any one of claims 1 to 5, comprising the steps of:
a) Fixing and conducting a laser diode to be tested, and moving a coupling component to the light emitting side of the laser diode to be tested;
b) Moving the coupling component, and measuring the maximum coupling light power value of the coupling component and the laser diode to be tested and the position coordinate of the coupling component in an X-Y plane under any Z-axis coordinate;
c) Updating the Z-axis coordinate, repeating the step b) until the test termination condition is reached, and obtaining the focal length and/or the spatial deflection angle of the laser diode to be tested.
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