CN115307748A - Device and method for measuring far and near field light spot modes of laser communication load - Google Patents

Abstract

The invention relates to a device and method for measuring the far-field and near-field spot patterns of a laser communication load. The device comprises a beam splitter, a near-field test device and a far-field test device; the near-field test device is arranged on the reflection of the beam splitter. On the optical path, the far-field testing device is arranged on the transmitted optical path of the beam splitter. Based on the light splitting function of the beam splitter, the present invention combines the far-field test device and the near-field test device to measure the same device. The far-field test device can measure the far-field mode of the light spot, the coaxial accuracy of the far-field optical axis, and the near-field test mode is completed. The light spot pattern in the near field of the light spot, and the near-field multi-optical axis coaxial situation; the far and near-field light spot detection is integrated, its structure is simple and easy to carry, and it can follow the laser communication load to carry out external field test experiments and participate in the whole star mechanics before and after experiments , to provide a practical and feasible solution for the timely measurement of laser communication loads.

Description

A device and method for measuring far and near-field spot patterns of laser communication payloads

technical field

The invention relates to the field of laser communication, in particular to a device and method for measuring far and near field light spot modes of laser communication loads.

Background technique

With the development of the aerospace industry, laser communication loads have also developed rapidly, and more and more restrictions have been placed on laser communication loads, such as technologies for miniaturization, light weight, spot quality, and coaxial accuracy of sending and receiving. requirements, but we can only use traditional methods for measurement, such as using a fixed collimator in the laboratory to perform partial measurements of the above-mentioned light spot quality, coaxial accuracy of sending and receiving, etc. Before and after experiments on star mechanics, the laser load could not be measured in time.

Contents of the invention

The technical problem to be solved by the present invention is to provide a device and method for measuring the far and near-field spot patterns of laser communication loads, so as to provide a feasible solution for timely measurement of laser communication loads.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a device for measuring the far and near-field spot patterns of laser communication loads, including a beam splitter, a near-field test device and a far-field test device; the near-field test device is arranged on the On the reflected optical path of the spectroscopic sheet, the far-field testing device is arranged on the transmitted optical path of the spectroscopic sheet;

The near-field test device includes a first combination lens, a reflector, a second combination lens and a beam model detector; the first combination lens is simultaneously arranged on the reflected light path of the spectroscopic sheet and the incident light path of the reflector , the second combination lens is arranged on the reflection light path of the mirror, and the beam model detector is arranged on the transmission light path of the second combination lens;

The far-field testing device includes an off-axis parabolic mirror telescope and a beam analyzer; the off-axis parabolic mirror telescope is arranged on the transmission light path of the spectrometer, and the beam analyzer is arranged opposite to the off-axis parabolic mirror telescope.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the first combination lens is composed of two opposite positive lenses.

Further, the second combination lens is composed of a positive lens and a negative lens oppositely arranged.

Further, the surface shape deviation RMS value of the light splitter is less than λ/30@632.8nm, and the light splitting ratio is 1:1.

Further, the surface precision of the off-axis parabolic mirror telescope is better than λ/50@632.8nm.

Based on the above-mentioned device for measuring far and near-field light spot patterns of laser communication payloads, the present invention also provides a method for measuring far and near-field light spot patterns of laser communication payloads.

A method for measuring far and near-field spot patterns of laser communication loads, using the above-mentioned device for measuring far and near-field spot patterns of laser communication loads for measurement, comprising the following steps,

Setting the measured laser communication load facing the incident optical path of the beam splitter in the device, and making the communication laser emitted by the measured laser communication load incident on the beam splitter;

Near-field spot measurement of laser communication load: the communication laser incident on the beam splitter is reflected by the beam splitter and sequentially passes through the first combination lens, mirror and second combination lens for beam reduction, and then enters the beam model detector Perform near-field spot mode measurement;

Laser communication payload far-field spot measurement: The communication laser incident on the beam splitter is transmitted through the beam splitter and converged into the beam analyzer through an off-axis parabolic mirror telescope for far-field spot mode measurement.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the near-field spot mode measurement includes near-field spot quality analysis or/and near-field multi-optical axis coaxial condition measurement; the far-field spot mode measurement includes far-field spot quality analysis or/and far-field multi-optical axis coaxial condition measurement; Shaft condition measurement.

Further, in the process of measuring the near-field multi-optical axis coaxial situation, the centroid of the light spot imaging on the beam model detector is recorded, and the near-field multi-optical axis coaxial situation measurement is completed through the centroid analysis.

Further, in the process of measuring the far-field multi-optical axis coaxial situation, the measured laser communication payload is used as the optical axis reference, and the reverse lighting is received, and the beam analyzer is used to measure the light spot and the measured laser communication payload emission. The deviation of the spot center of the light spot generated by reverse lighting, and dividing the deviation of the center of the spot by the focal length of the far-field test device is the multi-axis far-field coaxial accuracy.

The beneficial effects of the present invention are: in a device and method for measuring the far and near-field spot modes of laser communication loads in the present invention, based on the light-splitting function of the beam splitter, the far-field test device and the near-field test device are combined to measure the same device , the far-field test device can measure the far-field mode of the spot, the coaxial accuracy of the far-field optical axis, and the near-field test mode to complete the spot mode of the near-field of the spot and the coaxial situation of multiple optical axes in the near-field; integrate the far-field and near-field spot detection Together, its structure is simple and easy to carry. It can follow the laser communication payload for field test experiments and participate in the before and after experiments of the whole star mechanics, providing a feasible solution for the timely measurement of laser communication payloads. It is not only suitable for the emission spots of different laser communication payload systems It is also suitable for external field laser communication load coaxiality, spot mode detection, etc.; in addition, far and near field spot detection are integrated to form an integrated design, which can reduce device errors.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a device for measuring far and near-field spot patterns of laser communication loads according to the present invention;

Fig. 2 is the structural representation of near-field test device;

Fig. 3 is a schematic structural diagram of a far-field testing device.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Beam splitter, 2. Near-field test device, 21. First combination lens, 22. Mirror, 23. Second combination lens, 24. Beam model detector, 3. Far-field test device, 31. Off-axis paraboloid Mirror telescope, 32. Beam analyzer, 4. The laser communication load under test.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

As shown in Figure 1, a kind of device of measuring laser communication load far, near-field spot mode, comprises beam splitter 1, near-field testing device 2 and far-field testing device 3; Said near-field testing device 2 is arranged on said splitting On the reflected optical path of the sheet 1, the far-field test device 3 is arranged on the transmitted optical path of the spectroscopic sheet 1;

As shown in Figure 2, the near-field testing device 2 includes a first combination lens 21, a mirror 22, a second combination lens 23 and a beam model detector 24; the first combination lens 21 is arranged on the beam splitter at the same time 1 and the incident light path of the reflector 22, the second combined lens 23 is arranged on the reflected light path of the reflector 22, and the beam model detector 24 is arranged on the second combined lens 23 on the transmitted light path;

As shown in Figure 3, the far-field testing device 3 includes an off-axis parabolic mirror telescope 31 and a beam analyzer 32; The instrument 32 is arranged relative to the off-axis parabolic mirror telescope 31.

In this specific example:

The transmittance and reflectance of the beam splitter 1 in the wavelength range of 900nm-1600nm are 50:50, that is, the splitting ratio is 1:1; the RMS surface accuracy is better than 1/30λ@632.8nm.

In the near-field testing device 2 , the first combination lens 21 , the reflector 22 and the second combination lens 23 are composed of a 12-fold beam expander; wherein, the first combination lens 21 is composed of two opposite positive lenses. The second combined lens 23 is composed of a positive lens and a negative lens oppositely arranged. The model of the beam model detector 24 is XC130, and its main performance parameters are as follows: the working wavelength range is 900nm-1600nm, the single image size is 30um, and the image size is 320X256.

In the far-field test device, the off-axis parabolic mirror telescope 31 has an off-axis parabolic focal length of 1.5m and an aperture of 100mm, and its surface precision RMS is better than λ/50@632.8nm; the beam analyzer 32 is BGP-GigE- The main performance parameters of SP1230 are as follows: the working band is 900nm-1600nm, the single image size is 15um, and the image size is 640X512.

The working principle of a device for measuring the far and near-field spot patterns of laser communication loads of the present invention is as follows: the measured laser communication load 4 (the measured laser communication load 4 has the functions of laser emission and laser reception) is placed in front of the device of the present invention, The signal light is emitted, and the light beam enters the near-field test device 2 and the far-field test device 3 respectively through the beam splitter 1, and the reflection path enters the light spot of the near-field test device 2, and passes through the first combination lens 21, the mirror 22 and the second The combined lens 33 narrows the near-field spot into the beam model detector 24 for near-field spot detection, and can also measure the near-field multi-axis coaxial situation; the transmission path converges into the beam analyzer 32 through the off-axis parabolic mirror telescope 31 , for far-field spot detection. It is also possible to carry out the multi-optical coaxial situation of the laser communication load under test.

Based on the above-mentioned device for measuring far and near-field light spot patterns of laser communication payloads, the present invention also provides a method for measuring far and near-field light spot patterns of laser communication payloads.

A method for measuring the far and near-field spot patterns of laser communication loads, using the above-mentioned device for measuring the far and near-field spot patterns of laser communication loads for measurement, as shown in Figures 1 to 3, comprising the following steps,

Setting the measured laser communication load 4 facing the incident light path of the beam splitter 1 in the device, and making the communication laser emitted by the measured laser communication load 4 incident on the beam splitter 1;

Laser communication load near-field spot measurement: the communication laser incident on the spectroscopic sheet 1 is reflected by the spectroscopic sheet 1 and sequentially passed through the first combination lens 21, the reflector 22 and the second combination lens 23 for narrowing, and then enters the Near-field spot mode measurement is carried out in the beam model detector 24;

Laser communication payload far-field spot measurement: The communication laser incident on the beam splitter 1 is transmitted through the beam splitter 1 and converged into the beam analyzer 32 through the off-axis parabolic mirror telescope 31 for far-field spot mode measurement.

In this embodiment: the near-field spot mode measurement includes near-field spot quality analysis or/and near-field multi-optical axis coaxial condition measurement; the far-field spot mode measurement includes far-field spot quality analysis or/and far-field Multi-optical axis coaxial situation measurement.

Specifically, during the measurement of the near-field multi-optical axis coaxial situation, the centroid of the light spot imaging on the beam model detector 24 is recorded, and the near-field multi-optical axis coaxial situation measurement is completed through centroid analysis. For example: the measured laser communication load 4 emits a communication laser, and the communication laser is reflected by the beam splitter 1 to the first combination lens 21, the mirror 22, and the second combination lens 23 for beam reduction, and the near-field conditions of the spot are imaged on the beam model detector Within 24, the light spot quality analysis and centroid recording are performed through the software in the beam model detector 24, the near-field spot conditions are obtained through the light spot quality analysis, and the near-field multi-optical axis coaxial conditions are completed through the centroid analysis.

Specifically, in the process of measuring the far-field multi-optical axis coaxial situation, the measured laser communication load 4 emission is used as the optical axis reference, and the reverse lighting is received, and the measured laser communication load 4 emission is measured by the beam analyzer 32 The center deviation of the generated light spot and the light spot produced by reverse lighting, and dividing the center deviation of the light spot by the focal length of the far-field test device 3 is the multi-optical axis far-field coaxial accuracy. Receiving anti-lighting is because the receiving detector is connected by optical fiber. At this time, the receiving detector is separated from the receiving optical fiber, and then the laser is emitted in the direction of the receiving optical fiber position, and the centroid deviation of the two beams is measured on the beam analyzer. Data processing can be obtained The degree of deviation of the two optical axes.

In a device and method for measuring the far and near-field spot patterns of laser communication loads in the present invention, based on the light-splitting function of the beam splitter, the far-field test device and the near-field test device are combined to measure the same device, and the far-field test device can measure Spot far-field mode, far-field optical axis coaxial accuracy, near-field test mode to complete the near-field spot mode of the spot, near-field multi-axis coaxial situation, can measure the absolute direction of the far-field spot of different wavelengths, and can measure different wavelengths The coaxial situation of the optical axis of the miniaturized laser communication payload; the far and near-field spot detection are integrated together, its structure is simple and easy to carry, and it can follow the laser communication payload to conduct field test experiments and participate in the before and after experiments of the whole star mechanics. The timely measurement of communication loads provides a feasible solution, which is not only suitable for the emission spot test of different laser communication load systems, but also suitable for the coaxiality and spot mode detection of laser communication loads in the external field; in addition, the far and near field spot detection are integrated together An integrated design can reduce device errors.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (9)

1. A device for measuring far and near field light spot modes of laser communication loads is characterized in that: the device comprises a light splitting sheet (1), a near-field testing device (2) and a far-field testing device (3); the near-field testing device (2) is arranged on a reflection light path of the light splitting sheet (1), and the far-field testing device (3) is arranged on a transmission light path of the light splitting sheet (1);

the near field testing device (2) comprises a first combined lens (21), a reflecting mirror (22), a second combined lens (23) and a light beam model detector (24); the first combined lens (21) is arranged on a reflection light path of the light splitting sheet (1) and an incident light path of the reflector (22) at the same time, the second combined lens (23) is arranged on a reflection light path of the reflector (22), and the beam model detector (24) is arranged on a transmission light path of the second combined lens (23);

the far-field testing device (3) comprises an off-axis parabolic mirror telescope (31) and a beam analyzer (32); the off-axis parabolic mirror telescope (31) is arranged on a transmission light path of the light splitting sheet (1), and the light beam analyzer (32) is arranged opposite to the off-axis parabolic mirror telescope (31).

2. The device for measuring the far and near field optical spot patterns of the laser communication load according to claim 1, wherein: the first combined lens (21) is composed of two oppositely arranged positive lenses.

3. The apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the second combined lens (23) is formed by oppositely arranging a positive lens and a negative lens.

4. The apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the surface shape deviation RMS value of the light splitting sheet (1) is less than lambda/30@632.8nm, and the light splitting ratio is 1:1.

5. the apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the surface accuracy of the off-axis parabolic mirror telescope (31) is superior to lambda/50@632.8nm.

6. A method for measuring far and near field light spot modes of laser communication loads is characterized by comprising the following steps: the device for measuring the far and near field light spot modes of the laser communication load according to any one of the preceding claims 1 to 5 comprises the following steps,

the measured laser communication load (4) is arranged over against an incident light path of the light splitting sheet (1) in the device, and communication laser emitted by the measured laser communication load (4) is incident to the light splitting sheet (1);

laser communication load near-field light spot measurement: after being reflected by the light splitting sheet (1) and condensed by the first combined lens (21), the reflector (22) and the second combined lens (23) in sequence, the communication laser incident to the light splitting sheet (1) is incident to the light beam model detector (24) for near-field light spot mode measurement;

laser communication load far-field light spot measurement: the communication laser incident to the spectroscope (1) is transmitted by the spectroscope (1) and is converged into a light beam analyzer (32) through an off-axis parabolic mirror telescope (31) to carry out far-field light spot mode measurement.

7. The method of claim 6, wherein the method comprises the steps of: the near-field light spot mode measurement comprises near-field light spot quality analysis or/and near-field multi-optical-axis coaxial condition measurement; the far field spot pattern measurement comprises far field spot quality analysis or/and far field multi-optical axis on-axis condition measurement.

8. The method of claim 7, wherein the method comprises the steps of: in the process of measuring the coaxial condition of the near-field multiple optical axes, the centroid of the light spot imaging on the light beam model detector (24) is recorded, and the measurement of the coaxial condition of the near-field multiple optical axes is completed through centroid analysis.

9. The method of claim 7, wherein the method comprises the steps of: in the process of measuring the far-field multi-optical-axis coaxial condition, emission of a measured laser communication load (4) is used as an optical axis reference, reverse lighting is received, the light beam analyzer (32) is used for measuring the light spot center deviation amount of a light spot generated by emission of the measured laser communication load (4) and a light spot generated by reverse lighting, and the light spot center deviation amount is divided by the focal length of the far-field testing device (3) to obtain the multi-optical-axis far-field coaxial precision.

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