CN113532810B - QBH pointing error testing device and method - Google Patents
QBH pointing error testing device and method Download PDFInfo
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- CN113532810B CN113532810B CN202111094972.8A CN202111094972A CN113532810B CN 113532810 B CN113532810 B CN 113532810B CN 202111094972 A CN202111094972 A CN 202111094972A CN 113532810 B CN113532810 B CN 113532810B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
Abstract
The invention relates to the technical field of detection of high-power fiber laser devices, in particular to a QBH (quantum well balanced) pointing error testing device and a QBH pointing error testing method. The collimating lens is used for outputting parallel light beams; the first beam splitter prism splits the parallel light beam into a first light beam and a second light beam; and the shading component is utilized to shade the first light beam from passing through the first optical element group and the second light beam from passing through the second optical element group and then being incident to the position sensor, and the coordinates of the light spot of the light beam on the position sensor are recorded. And calculating the axis deviation value and the pointing error of the QBH according to the coordinates and the optical path difference of the first light beam and the second light beam. Can solve among the prior art QBH output optical cable pointing error unsatisfied requirement, can lead to unable cutting welding to go out qualified section quality and welding quality, arouse even to generate heat, burn out whole laser instrument, cause dangerous problem.
Description
Technical Field
The invention relates to the technical field of detection of high-power fiber laser devices, in particular to a QBH pointing error testing device and a QBH pointing error testing method.
Background
With the continuous popularization of domestic fiber lasers, the power is higher and higher. From hundreds of watts to tens of thousands of watts. Has been widely applied to the fields of science and technology, military, medical treatment, industrial processing and the like. In the manufacturing industry, the light source is used as a high-intensity light source for cutting, punching, welding and the like. In the high-power optical fiber laser, the fiber core is in a micron level, and the laser in a kilowatt level cannot be directly output to the air from the fiber core, otherwise, the optical fiber can be burnt. Therefore, a tapered quartz rod needs to be welded at the tail end of the output optical fiber, and laser is led out through the quartz rod, so that the optical fiber is protected from being damaged. The quartz rod is the QBH (fiber laser cable) output cable of the fiber laser. Then, due to the reasons of process, design, manufacture, welding and the like, after the laser passes through the QBH output optical cable, the laser beam can be degraded and subjected to pointing deviation, and the quality of the laser beam and the later-stage cutting and welding quality are further influenced.
At present, no standard test method exists in the measurement industry of the pointing error of the QBH optical cable, so that the quality and the quality of the QBH optical cable cannot be evaluated. Affecting the performance consistency of the fiber laser. Meanwhile, if the QBH output optical cable pointing error has a problem, qualified section quality and welding quality cannot be cut and welded, even heating is caused, and the whole laser is burnt out, so that the QBH laser is very dangerous. Therefore, how to measure QBH output cables under laser safety testing has been a major issue in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a QBH (Quadrature-quality-indicator-frequency) pointing error testing device and a QBH pointing error testing method, which can solve the problem that qualified cross section quality and welding quality cannot be cut and welded due to the fact that a QBH output optical cable pointing error in the prior art does not meet requirements, even a heating problem is caused, and the whole laser is burnt to cause danger.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a device for testing a QBH cable pointing error, comprising:
the collimating lens is used for receiving the divergent light of the QBH cable and outputting a parallel light beam;
the first light splitting prism is arranged on a light path of the collimating lens and is used for splitting the parallel light beams into a first light beam and a second light beam which form an angle;
a first optical element group and a second optical element group provided on optical paths of the first light beam and the second light beam, respectively, the first optical element group and the second optical element group being configured to: the optical paths of the first light beam and the second light beam after the theoretical straight light is split by the first light splitting prism and the first optical element group and the second optical element group are different, and the emergent paths are consistent;
a shading component for shading the first light beam or the second light beam;
and the position sensor is arranged on a light path of the first light beam and the second light beam passing through the first optical element group and the second optical element group and used for measuring the spot positions of the first light beam and the second light beam.
In some optional schemes, the first beam splitter prism is a 50:50 beam splitter prism, and is used for splitting the parallel light beam into two first light beams and two second light beams which are 90 degrees.
In some optional schemes, the first optical element group includes a second light splitting prism and a first total reflection mirror, which are sequentially disposed, the first light splitting prism, the second light splitting prism and the first total reflection mirror are located on a same straight line, and the first light beam is reflected to the position sensor through the first total reflection mirror after passing through the first light splitting prism and the second light splitting prism.
In some optional schemes, the second optical element group includes a second total reflection mirror, a third total reflection mirror, a second dichroic prism and a first total reflection mirror, which are sequentially arranged, a connection line between the first dichroic prism, the second total reflection mirror, the third total reflection mirror and the second dichroic prism is rectangular, and the second light beam is reflected by the second total reflection mirror and the third total reflection mirror, then passes through the second dichroic prism, and is reflected by the first total reflection mirror to the position sensor.
In some optional schemes, the light shielding assembly includes a diaphragm, a bracket and a diaphragm motor, which are connected in sequence, and the diaphragm motor can move through the driving bracket to drive the diaphragm to shield the first light beam or the second light beam.
In some optional schemes, the device further comprises a sensor adjusting mechanism, wherein the sensor adjusting mechanism comprises an adjusting frame and an adjusting motor, and the adjusting motor is connected with the position sensor through the adjusting frame to adjust the position of the position sensor so as to meet the detection requirement.
In some optional schemes, a high-reflection mirror assembly is arranged between the collimating lens and the first light splitting prism and used for attenuating the parallel light beams, and the first light splitting prism is arranged on a transmission light path of the high-reflection mirror assembly.
In some optional schemes, the device further comprises a power meter which is arranged on a reflection optical path of the high-reflection mirror assembly and used for detecting the power of the parallel light beams.
On the other hand, the invention also provides a QBH directional error testing method, which is implemented by using the QBH directional error testing device and comprises the following steps:
divergent light is input to the collimating lens through the QBH, and parallel light beams are output to the first light splitting prism, so that the parallel light beams are split into two first light beams and two second light beams which form angles;
shielding the second light beam by using a shading assembly, enabling the first light beam to be incident to the position sensor through the first optical element group, and recording a first coordinate of a light spot of the first light beam on the position sensor;
shielding the first light beam by using a shading assembly, enabling a second light beam to be incident to the position sensor through a second optical element group, and recording a second coordinate of a light spot of the second light beam on the position sensor;
and calculating the axis deviation value and the pointing error of the QBH according to the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimating lens to the position sensor through the first optical element group and the optical path of the parallel light beam from the collimating lens to the position sensor through the second optical element group.
In some optional solutions, the calculating the axis deviation value and the pointing error of the QBH according to the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimating lens to the position sensor through the first optical element group, and the optical path of the parallel light beam from the collimating lens to the position sensor through the second optical element group specifically includes:
according to the formula
Calculating an axis deviation value X0 in the X-axis direction;
according to the formula
Calculating an axis deviation value Y0 in the Y-axis direction;
according to the formula
Or
Calculating a pointing error angle Er;
according to the formula
Calculating a pointing error direction Ew;
wherein L1 is an optical path of the parallel light beam incident on the position sensor from the collimator lens through the first optical element group, L2 is an optical path of the parallel light beam incident on the position sensor from the collimator lens through the second optical element group 4, X1 is an X-axis coordinate in the first coordinate, Y1 is a Y-axis coordinate in the first coordinate, X2 is an X-axis coordinate in the second coordinate, Y2 is a Y-axis coordinate in the second coordinate, dL is an optical path difference, dL is L2-L1, dX is an X-axis coordinate difference, dX is X2-X1, dY is a Y-axis coordinate difference, dY is Y2-Y1, and ds is a position difference between the first coordinate and the second coordinate
Compared with the prior art, the invention has the advantages that: the first beam splitter prism is used for splitting the parallel light beams into a first light beam and a second light beam, the shading assembly is used for shading the first light beam or the second light beam, the first light beam is made to pass through the first optical element group and the second light beam is made to pass through the second optical element group and enter the position sensor, and first coordinates of light spots of the first light beam and the second light beam at the position sensor are recorded; and calculating the axis deviation value and the pointing error of the QBH according to the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimating lens to the position sensor through the first optical element group and the optical path of the parallel light beam from the collimating lens to the position sensor through the second optical element group. The device conveniently and effectively realizes measurement of pointing error of the QBH output optical cable used by the fiber laser; the problem that QBH output optical cable pointing error exists can be avoided, qualified section quality and welding quality can be caused to be cut and welded out, even heating and burning of the whole laser device are caused, and danger is caused.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram of a QBH pointing error test apparatus in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a first light beam passing through a first optical element set according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a second light beam passing through a second optical element set according to an embodiment of the present invention;
FIG. 4 is a flowchart of a QBH error test method in an embodiment of the present invention.
In the figure: 1. a collimating lens; 2. a first beam splitting prism; 3. a first optical element group; 31. a second beam splitting prism; 32. a first total reflection mirror; 4. a second optical element group; 41. a second total reflection mirror; 42. a third total reflection mirror; 5. a shading component; 51. a diaphragm; 52. a support; 53. a diaphragm motor; 6. a position sensor; 7. a sensor adjustment mechanism; 71. an adjusting frame; 72. adjusting the motor; 8. a high-reflectivity mirror assembly; 81. a first high-reflection mirror; 82. a second high-reflection mirror; 9. a power meter; 10. a protective outer cover; 101. an attenuation space; 102. a test space; 103. a DB interface; 104. an alarm switch; 105. a scram switch; 106. a master switch; 107. an optical flat plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, in one aspect, the present invention provides a QBH pointing error testing apparatus, including: a collimating lens 1, a first beam splitter prism 2, a first optical element group 3, a second optical element group 4, a light shielding assembly 5, and a position sensor 6.
The collimating lens 1 is used for receiving divergent light of the QBH cable and outputting parallel light beams; the first light splitting prism 2 is arranged on the light path of the collimating lens 1 and is used for splitting the parallel light beams into a first light beam and a second light beam which form an angle; the first optical element group 3 and the second optical element group 4 are provided on optical paths of the first light beam and the second light beam, respectively, and the first optical element group 3 and the second optical element group 4 are configured to: the optical paths of the first light beam and the second light beam which are split by the theoretical straight light through the first beam splitter prism 2 and pass through the first optical element group 3 and the second optical element group 4 are different, and the emitting paths are consistent; the shading component 5 is used for shading the first light beam or the second light beam; the position sensor 6 is disposed on a light path of the first and second light beams passing through the first and second optical element groups 3 and 4, and measures spot positions of the first and second light beams.
When the QBH pointing error testing device is used, the positions of a first optical element group 3 and a second optical element group 4 are adjusted, divergent light is input to a collimating lens 1 through the QBH, and parallel light beams are output to a first light splitting prism 2, so that the parallel light beams are divided into two first light beams and two second light beams which form angles; the shading component 5 is used for shading the second light beam, so that the first light beam is incident to the position sensor 6 through the first optical element group 3, and a first coordinate of a light spot of the first light beam at the position sensor 6 is recorded; then, the shading component 5 is used for shading the first light beam, so that the second light beam is incident to the position sensor 6 through the second optical element group 4, and a second coordinate of the light spot of the second light beam at the position sensor 6 is recorded; the axis deviation value and the pointing error of QBH are calculated based on the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimator lens 1 through the first optical element group 3 to the position sensor 6, and the optical path of the parallel light beam from the collimator lens 1 through the second optical element group 4 to the position sensor 6. The device conveniently and effectively realizes the measurement of the pointing error of the QBH output optical cable used by the optical fiber laser; the problem of the processing that the problem exists and lead to is avoided QBH output optical cable to point to the error, for example the section quality problem of cutting process and the welding quality problem of welding process, can also avoid generating heat and cause the laser instrument to burn out, and then cause dangerous problem.
In this example, the first optical element group 3 and the second optical element group 4 are configured to: the optical paths of the first light beam and the second light beam which are split by the theoretical straight light through the first beam splitter prism 2 and then pass through the first optical element group 3 and the second optical element group 4 are different, and the emergent paths are consistent. Therefore, when in measurement, after the parallel light beams output by the collimating lens 1 are split by the first beam splitter prism 2, the two light beams are propagated along a straight line and only have different optical paths after passing through the first optical element group 3 and the second optical element group 4, so that the pointing error can be calculated by using the final coordinate difference and the optical path difference.
When the first optical element group 3 and the second optical element group 4 are aligned, a standard QBH cable is usually used, and the collimator lens 1 receives divergent light from the standard QBH cable and outputs a parallel light beam as the theoretical straight light to align the positions of the first optical element group 3 and the second optical element group 4. The position sensor 6 is a four-quadrant position sensor, and can accurately measure the coordinates of the first light beam and the second light beam.
In some alternative embodiments, the first beam splitter prism 2 is a 50:50 beam splitter prism for splitting the parallel light beam into two first and second beams at 90 °.
In this embodiment, the first beam splitter prism 2 is a 50:50 beam splitter prism, which splits the parallel light beam into two light beams at 90 °, in other embodiments, other beam splitter prisms may be used, which splits the parallel light beam into a first light beam and a second light beam at other angles, and the same effect can be achieved as long as it is ensured that the paths of the first light beam and the second light beam split by the first beam splitter prism 2, the first optical element group 3 and the second optical element group 4, and the first light beam and the second light beam are the same, and can vertically enter the position sensor 6.
As shown in fig. 2, in some alternative embodiments, the first optical element group 3 includes a second light splitting prism 31 and a first total reflection mirror 32, which are sequentially arranged, the first light splitting prism 2, the second light splitting prism 31 and the first total reflection mirror 32 are located on the same straight line, and the first light beam is transmitted through the first light splitting prism 2 and the second light splitting prism 31, and then reflected to the position sensor 6 through the first total reflection mirror 32.
In this embodiment, the second light splitting prism 31 is also a 50:50 light splitting prism, and the exit direction of the first light beam after being reflected by the first total reflection mirror 32 forms an included angle of 90 ° with the straight line where the first light splitting prism 2, the second light splitting prism 31 and the first total reflection mirror 32 are located.
In this example, the first beam splitter prism 2 and the second beam splitter prism 31 both adopt a cubic prism using the foot bonding technique (LBTEK), and the main parameters are AR COATING (S1, S2, S3 and S4) RAVG < 0.5% @800nm-1200nm (6 degree AOI, SINGLE SURFACE).
As shown in fig. 3, in some optional embodiments, the second optical element group 4 includes a second total reflection mirror 41, a third total reflection mirror 42, a second light splitting prism 31, and a first total reflection mirror 32, which are sequentially arranged, a connection line between the first light splitting prism 2, the second total reflection mirror 41, the third total reflection mirror 42, and the second light splitting prism 31 is rectangular, and after being reflected by the second total reflection mirror 41 and the third total reflection mirror 42, the second light beam passes through the second light splitting prism 31 and is reflected by the first total reflection mirror 32 to the position sensor 6.
In the present embodiment, the second light beam is reflected by 90 ° by the second half mirror 41, reflected by 90 ° by the third half mirror 42, and returned to the second beam splitter prism 31 and the first half mirror 32 shared by the first optical element group 3. The second beam splitter prism 31 deflects the second light beam by 90 ° toward the first half mirror 32, thereby entering the position sensor 6. In other embodiments, other optical element groups may be used as long as the paths of the first light beam and the second light beam split by the first splitting prism 2 and emitted after passing through the first optical element group 3 and the second optical element group 4 are consistent.
Referring again to fig. 1, in some alternative embodiments, the light shielding assembly 5 includes a diaphragm 51, a support 52 and a diaphragm motor 53 connected in sequence, and the diaphragm motor 53 can move by driving the support 52 to drive the diaphragm 51 to shield the first light beam or the second light beam.
In this embodiment, during a test, the support 52 may be driven by the diaphragm motor 53 to move, so that the diaphragm 51 blocks the first light beam or the second light beam, and the first light beam and the second light beam enter the position sensor 6 to be detected after passing through different optical paths respectively. By using the electric control mode, the safety of detection personnel can be ensured when high-power laser is detected.
In some optional embodiments, the QBH pointing error testing device further comprises a sensor adjusting mechanism 7, the sensor adjusting mechanism 7 comprises an adjusting frame 71 and an adjusting motor 72, and the adjusting motor 72 is connected with the position sensor 6 through the adjusting frame 71 to adjust the position of the position sensor 6 to meet the detection requirement.
In this embodiment, during a test, the adjustment frame 71 can be driven by the adjustment motor 72 to move, so as to drive the position sensor 6 to move, so that the position of the position sensor 6 meets a detection requirement, specifically, the position sensor 6 is perpendicular to the first light beam or the second light beam emitted after passing through the first optical element group 3 and the second optical element group 4.
In some alternative embodiments, a high-reflection mirror assembly 8 is disposed between the collimating lens 1 and the first beam splitting prism 2 for attenuating the parallel light beams, and the first beam splitting prism 2 is disposed on a transmission light path of the high-reflection mirror assembly 8.
In this embodiment, the high-reflection mirror assembly 8 includes a first high-reflection mirror 81 and a second high-reflection mirror 82, and both the first high-reflection mirror 81 and the second high-reflection mirror 82 allow 0.6% of the laser light to pass through, and the remaining 99.6% of the laser light is totally reflected, so that the transmitted power is not too high to damage the position sensor.
In some optional embodiments, the QBH pointing error testing device further comprises a power meter 9, which is arranged on the reflected light path of the high reflection mirror assembly 8 and is used for detecting the power of the parallel light beam. In addition, the power meter 9 monitors the power of the high-power fiber laser for testing in real time, and when an abnormality occurs, the power can be judged through data collected by a computer, so that the power supply is quickly turned off, and the testing safety is guaranteed.
In this embodiment, the high-reflection mirror assembly 8 includes a first high-reflection mirror 81 and a second high-reflection mirror 82, the first high-reflection mirror 81 reflects the parallel light beam by 90 °, and the power meter 9 is disposed on a reflection light path of the first high-reflection mirror 81 and is configured to detect the power of the parallel light beam.
A beam analyzer is also arranged on the reflected light path of the second high reflecting mirror 82 and used for detecting the quality of the parallel light beams. The beam quality analyzer adopts M2MS-BP209 IR/M. The position sensor 6 is PDQ 30C. The parallel light beam passes through the first high reflection mirror 81, and then the power is reduced, so that the damage to the light beam quality analyzer can be avoided.
The QBH pointing error testing device further comprises a protective outer cover 10, wherein an accommodating space is arranged in the protective outer cover, the protective outer cover is box-shaped and is provided with a hinged box cover, and the protective outer cover can be opened and closed towards one side. The collimating lens 1 is arranged at one end of the box body and is vertical to the box wall; the first beam splitter prism 2, the first optical element group 3, the second optical element group 4, the shading component 5 and the position sensor 6 are arranged in the accommodating space and are arranged on an optical flat plate 107 at the bottom of the box body, and the optical flat plate 107 can keep the optical elements horizontal and reduce vibration. Collimating lens 1 adopts two locking structure of cutting head, and front end installation collimation lens simultaneously, and fastening degree when guaranteeing QBH output optical cable transversely installs avoids the test procedure pine to take off, ensures test safety.
In addition, the interior of the protective outer cover 10 is provided with an accommodating space which is divided into an attenuation space 101 and a test space 102 which are mutually separated, the attenuation space 101 and the test space 102 are both provided with openable cover plates, a support frame is further arranged between the cover plates and the box body, the power meter 9 and the high-reflection mirror assembly 8 are arranged in the attenuation space 101, and the first light splitting prism 2, the first optical element group 3, the second optical element group 4, the shading assembly 5 and the position sensor 6 are arranged in the test space 102. The above devices are all arranged on the optical flat plate 107, and the optical flat plate 107 can keep the optical elements horizontal and reduce vibration.
The box body of the protective housing 10 is also provided with two DB interfaces 103 which are in signal connection with the power meter 9, the position sensor 6, the light beam quality analyzer, the adjusting motor 72 and the diaphragm motor 53 through data lines, and the DB interfaces can be connected with a control device to acquire data detected by the power meter 9, the position sensor 6 and the light beam quality analyzer and can also send control instructions to the adjusting motor 72 and the diaphragm motor 53. In addition, an alarm switch 104, an emergency stop switch 105 and a main switch 106 are disposed on the box body of the protective housing 10, in this example, disposed on two sides of the collimating lens 1, respectively, and the alarm switch 104 and the emergency stop switch 105 can give an alarm when the power meter 9 detects that the power of the light beam is too high, or can be used to manually turn off the detection device and the high-power laser in an emergency.
As shown in fig. 4, in combination with fig. 2 and 3, in another aspect, the present invention further provides a QBH-oriented error testing method, which is implemented by using the above QBH-oriented error testing apparatus, and includes the following steps:
s1: divergent light is input to the collimating lens 1 through the QBH, and parallel light beams are output to the first beam splitter prism 2, so that the parallel light beams are split into two first light beams and two second light beams which form an angle.
In this embodiment, step S1 specifically includes: welding the QBH optical cable to be tested with an output optical cable of a high-power laser; inserting the QBH output optical cable to be tested into the collimating lens 1;
in addition, in the embodiment in which the power meter 9 and the beam quality analyzer are provided, the power meter 9, the position sensor 6, the beam quality analyzer, the adjustment motor 72, and the diaphragm motor 53, and the high-power fiber laser are connected to the water cooling machine and the respective control circuits and signals.
S2: and shielding the second light beam by using the shading component 5, enabling the first light beam to pass through the first optical element group 3 and be incident to the position sensor 6, and recording a first coordinate of a light spot of the first light beam on the position sensor 6.
S3: and the first light beam is shielded by the shading component 5, the second light beam is incident to the position sensor 6 through the second optical element group 4, and the second coordinate of the light spot of the second light beam on the position sensor 6 is recorded.
In addition, in the embodiment in which the power meter 9 and the beam quality analyzer are provided, the power meter 9 and the beam quality tester are turned on, and power and beam measurement is performed on the beam of laser light.
And if the test process has problems, ending the test. If the optical fiber is burnt due to poor fusion quality of the optical fiber or the problems of QBH beam pointing and QBH beam quality, the power supply of the laser is quickly cut off through the detection power signal of the power meter 9, and the test is stopped. The control device controls and adjusts the output power of the laser.
S4: and calculating the axial deviation value and the pointing error of the QBH according to the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimating lens 1 to the position sensor 6 through the first optical element group 3 and the optical path of the parallel light beam from the collimating lens 1 to the position sensor 6 through the second optical element group 4.
In this embodiment, step S4 specifically includes:
according to the formula
Calculating an axis deviation value X0 in the X-axis direction; according to the formula
Calculating an axis deviation value Y0 in the Y-axis direction; according to the formula
Or
Calculating a pointing error angle Er; according to the formula
The pointing error direction Ew is calculated.
Wherein L1 is an optical path of the parallel light beam from the collimator lens 1 to the position sensor 6 through the first optical element group 3, L2 is an optical path of the parallel light beam from the collimator lens 1 to the position sensor 6 through the second optical element group 4, X1 is an X-axis coordinate in a first coordinate, Y1 is a Y-axis coordinate in the first coordinate, X2 is an X-axis coordinate in a second coordinate, Y2 is a Y-axis coordinate in the second coordinate, dL is an optical path difference, dL is L2-L1, dX is an X-axis coordinate difference, dX is X2-X1, dY is a Y-axis coordinate difference, dY is Y2-Y1, and ds is a position difference between the first coordinate and the second coordinate
In conclusion, the QBH pointing error testing device and the QBH pointing error testing method can be used for conveniently and effectively measuring the pointing error of the QBH output optical cable used by the optical fiber laser; a high-reflection mirror assembly 8 is arranged between the collimating lens 1 and the first beam splitter prism 2, so that the quality test of laser beams under different powers is realized; the power meter 9 can be used for realizing the real-time monitoring of the power of the fiber laser and ensuring the safety of the test; the shading component 5 is utilized to conveniently control the turn-off of different light paths, and the transmission of different paths of light beams is realized.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A QBH pointing error test apparatus, comprising:
the collimating lens (1) is used for receiving the divergent light of the QBH cable and outputting a parallel light beam;
the first light splitting prism (2) is arranged on the light path of the collimating lens (1) and is used for splitting the parallel light beams into a first light beam and a second light beam which form an angle;
a first optical element group (3) and a second optical element group (4) respectively provided on optical paths of the first and second light beams, the first optical element group (3) and the second optical element group (4) being configured to: when the parallel light beams are theoretical straight light, the optical paths of the first light beam and the second light beam which are split by the first light splitting prism (2) and pass through the first optical element group (3) and the second optical element group (4) are different, and the emitting paths are consistent;
a shading component (5) for shading the first light beam or the second light beam;
and the position sensor (6) is arranged on an emergent light path of the first light beam passing through the first optical element group (3) and the second light beam passing through the second optical element group (4) and is used for measuring the spot positions of the first light beam and the second light beam.
2. The QBH pointing error test device of claim 1, characterized in that said first beam splitter prism (2) is a 50:50 beam splitter prism for splitting said parallel beam into two first and second beams at 90 °.
3. The QBH pointing error testing device according to claim 2, characterized in that the first optical element group (3) comprises a second beam splitter prism (31) and a first total reflection mirror (32) which are arranged in sequence, the first beam splitter prism (2), the second beam splitter prism (31) and the first total reflection mirror (32) are positioned on the same straight line, and the first light beam is transmitted through the first beam splitter prism (2) and the second beam splitter prism (31) and then reflected to the position sensor (6) through the first total reflection mirror (32).
4. The QBH pointing error testing device according to claim 3, wherein the second optical element group (4) comprises a second total reflection mirror (41), a third total reflection mirror (42), a second beam splitter prism (31) and a first total reflection mirror (32) which are arranged in sequence, a connecting line between the first beam splitter prism (2), the second total reflection mirror (41), the third total reflection mirror (42) and the second beam splitter prism (31) is rectangular, and after the second light beam is reflected by the second total reflection mirror (41) and the third total reflection mirror (42), the second light beam is transmitted through the second beam splitter prism (31) and then reflected to the position sensor (6) through the first total reflection mirror (32).
5. The QBH pointing error test device according to claim 1, characterized in that the shading component (5) comprises a diaphragm (51), a bracket (52) and a diaphragm motor (53) which are connected in sequence, and the diaphragm motor (53) can move through the driving bracket (52) to drive the diaphragm (51) to block the first light beam or the second light beam.
6. The QBH pointing error testing device according to claim 1, characterized by further comprising a sensor adjusting mechanism (7), wherein the sensor adjusting mechanism (7) comprises an adjusting bracket (71) and an adjusting motor (72), and the adjusting motor (72) is connected with the position sensor (6) through the adjusting bracket (71) to adjust the position of the position sensor (6) to meet the detection requirement.
7. The QBH pointing error test device according to claim 1, characterized in that a high-reflection mirror assembly (8) is provided between the collimator lens (1) and the first beam splitter prism (2) for attenuating the parallel light beam, the first beam splitter prism (2) being provided in the transmission path of the high-reflection mirror assembly (8).
8. The QBH pointing error test device according to claim 7, characterized by further comprising a power meter (9) provided on the reflected light path of said high reflection mirror assembly (8) for detecting the power of said parallel light beam.
9. A QBH directed error test method, characterized in that it is implemented with the QBH directed error test apparatus of claim 1, comprising the steps of:
divergent light is input into a collimating lens (1) through a QBH (quantum well laser), and parallel light beams are output to a first light splitting prism (2), so that the parallel light beams are split into a first light beam and a second light beam which form an angle;
shielding the second light beam by using a shading component (5), enabling the first light beam to be incident to a position sensor (6) through a first optical element group (3), and recording a first coordinate of a light spot of the first light beam on the position sensor (6);
shielding the first light beam by using a shading component (5), enabling a second light beam to be incident to a position sensor (6) through a second optical element group (4), and recording a second coordinate of a light spot of the second light beam on the position sensor (6);
and calculating the axis deviation value and the pointing error of the QBH according to the first coordinate, the second coordinate, the optical path of the parallel light beam from the collimating lens (1) to the position sensor (6) through the first optical element group (3) and the optical path of the parallel light beam from the collimating lens (1) to the position sensor (6) through the second optical element group (4).
10. The QBH pointing error test method according to claim 9, wherein said calculating the axis deviation value and pointing error of QBH based on the first coordinate, the second coordinate, the optical path of the parallel beam from the collimator lens (1) through the first optical element group (3) to the position sensor (6) and the optical path of the parallel beam from the collimator lens (1) through the second optical element group (4) to the position sensor (6) comprises:
according to the formula
Calculating an axis deviation value X0 in the X-axis direction;
according to the formula
Calculating an axis deviation value Y0 in the Y-axis direction;
according to the formula
Or
Calculating a pointing error angle Er;
according to the formula
Calculating a pointing error direction Ew;
wherein, L1 is an optical path of the parallel light beam from the collimating lens (1) to the position sensor (6) through the first optical element group (3), L2 is an optical path of the parallel light beam from the collimating lens (1) to the position sensor (6) through the second optical element group (4), X1 is an X-axis coordinate in the first coordinate, Y1 is a Y-axis coordinate in the first coordinate, X2 is an X-axis coordinate in the second coordinate, Y2 is a Y-axis coordinate in the second coordinate, dL is an optical path difference, dL 2-L1, dX is an X-axis coordinate difference, dX is X2-X1, dY is a Y-axis coordinate difference, dY is Y2-Y1, ds is a position difference between the first coordinate and the second coordinate
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