CN111505835A - Transmitting and receiving combined system for isolating emitted light and echo light - Google Patents
Transmitting and receiving combined system for isolating emitted light and echo light Download PDFInfo
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- CN111505835A CN111505835A CN202010422887.9A CN202010422887A CN111505835A CN 111505835 A CN111505835 A CN 111505835A CN 202010422887 A CN202010422887 A CN 202010422887A CN 111505835 A CN111505835 A CN 111505835A
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- light
- avalanche photodiode
- echo
- receiving
- polarization
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
Abstract
The invention discloses a transmitting and receiving combined system for isolating emitted light and echo light, which comprises: the device comprises a light source, a polarizer, a polarization splitting prism, an 1/4 wave plate, a first avalanche photodiode and a second avalanche photodiode which are coaxially arranged, wherein the first avalanche photodiode and the second avalanche photodiode are respectively and electrically connected with a signal processing system; the optical path in the transceiving combined system of the invention can ensure that the echo light can be isolated from the emitted light by the polarization principle. The light path in the receiving and transmitting combined system can enable the transmitting view field and the receiving view field to be overlapped to the maximum degree, and the receiving efficiency of the system is improved. The light path in the transmitting-receiving combined system can reuse part of light energy which cannot be used as signal light to penetrate through the first polarization beam splitter Prism (PBS) as reference light, so that the laser output efficiency of the system is improved. The receiving and transmitting combined system optical path can be applied to the technologies of laser heterodyne interference, linear frequency modulation laser and the like which need a reference light background.
Description
Technical Field
The invention belongs to the field of optics, and particularly relates to a transmitting and receiving combined system for isolating emitted light and echo light.
Background
In an optical antenna system, the coincidence degree of an echo visual field and a receiving visual field is an important index for measuring the efficiency of a receiving system, and the optical antenna system can be divided into two categories of split receiving and combined receiving.
The split receiving means that the receiving system and the transmitting system are separated, and the optical axes of the receiving system and the transmitting system are theoretically separated, so that the view field relationship of the echo and the receiving system is shown in fig. 1, and the overlapped part of the target echo view field and the detector receiving view field is the light view field which can be received by the system.
The combined receiving means that the receiving system and the transmitting system are integrated, the relationship between the echo and the receiving view field is as shown in figure 2, and as the light path is the receiving and transmitting combined position, the receiving view field of the detector is overlapped with the laser transmitting view field and is completely covered by the target echo view field, so that the high-efficiency receiving can be realized. The orange area echo visual field and the green area receiving visual field of the receiving and transmitting combined system are almost completely overlapped, so that the 100% coverage of the echo visual field to the receiving visual field is realized theoretically, and the receiving efficiency is higher.
Disclosure of Invention
In order to distinguish the emitted light from the echo light, improve the imaging quality of the system and simultaneously avoid wasting the laser energy in the system as much as possible, the invention provides a transmitting and receiving combined system for isolating the emitted light and the echo light, and the technical scheme is as follows:
a combined transmit and receive system for isolating transmit light from echo light, comprising: the device comprises a light source, a polarizer, a polarization splitting prism, an 1/4 wave plate, a first avalanche photodiode and a second avalanche photodiode which are coaxially arranged, wherein the first avalanche photodiode and the second avalanche photodiode are respectively and electrically connected with a signal processing system;
the light source emits non-linear polarized laser which vertically enters the polarizer to form quasi-linear polarized light which vertically enters the polarization splitting prism; the reflected light of the polarization beam splitter prism vertically enters the second avalanche photodiode, and the second avalanche photodiode transmits an input signal to a signal processing system; the transmitted light of the polarization beam splitter prism vertically enters the 1/4 wave plate, the polarization state of the transmitted light is converted from linear polarization into circularly polarized light, and the transmitted light of the 1/4 wave plate vertically enters a target to generate echo light;
the echo light vertically enters the 1/4 wave plate, the polarization state of the echo light is converted into linearly polarized light from circular polarization, and the vibration direction rotates by 90 degrees; the transmitted light of the 1/4 wave plate vertically enters the polarization beam splitter prism, the reflected light of the polarization beam splitter prism vertically enters the first avalanche photodiode, and the first avalanche photodiode transmits an echo signal to a signal processing system.
Preferably, the WPQ10E-1550 type zero-order 1/4 wave plate is used as the quarter-wave plate.
Compared with the prior art, the invention has the following technical effects:
the optical path in the transceiving combined system of the invention can ensure that the echo light can be isolated from the emitted light by the polarization principle.
The light path in the receiving and transmitting combined system can enable the transmitting view field and the receiving view field to be overlapped to the maximum degree, and the receiving efficiency of the system is improved.
The light path in the transmitting-receiving combined system can reuse part of light energy which cannot be used as signal light to penetrate through the first polarization beam splitter Prism (PBS) as reference light, so that the laser output efficiency of the system is improved.
The optical path in the receiving and transmitting combined system can be applied to the technologies of laser heterodyne interference, linear frequency modulation laser and the like which need a reference light background.
Drawings
FIG. 1 is a schematic diagram illustrating a relationship between an echo view field and a receiving view field of a transceiving split-location system in the prior art;
FIG. 2 is a diagram illustrating a relationship between an echo visual field and a receiving visual field of a transceiving combined system in the prior art;
FIG. 3 is a schematic diagram of an embodiment of a transceiver system;
FIG. 4 is a diagram illustrating the polarization state change of the 1/4 wave plate in the example.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the first embodiment is as follows:
in this embodiment, the transmitting and receiving combined system for isolating the emitted light and the echo light of the present invention is adopted, as shown in fig. 3, the light source, the polarizer, the polarization splitting prism, the 1/4 wave plate, the first avalanche photodiode and the second avalanche photodiode are coaxially arranged, and are respectively electrically connected to the signal processing system;
the light source emits non-linear polarized laser which vertically enters the polarizer to form quasi-linear polarized light which vertically enters the polarization splitting prism; the reflected light of the polarization beam splitter prism vertically enters a second avalanche photodiode, and the second avalanche photodiode is electrically connected with the signal processing system and transmits an input signal; the transmitted light of the polarization beam splitter prism is vertically incident on the 1/4 wave plate, as shown in fig. 4, the polarization state of the transmitted light is converted from linear polarization into circular polarization, and the transmitted light of the 1/4 wave plate is vertically incident on the target to generate echo light.
The echo light vertically enters 1/4 wave plate, the polarization state is converted into linearly polarized light from circular polarization, and the vibration direction rotates 90 degrees, so that linearly polarized light which is not matched with the polarization state of the polarization beam splitter prism is formed; 1/4, the transmitted light of the wave plate vertically enters the polarization beam splitter prism, the reflected light of the polarization beam splitter prism vertically enters the first avalanche photodiode, the first avalanche photodiode is electrically connected with the signal processing system, the echo signal is transmitted, and polarization isolation of the transmitted light and the echo light is realized.
Example two:
the further design of this embodiment lies in: the quarter-wave plate in this embodiment is a zero-order WPQ10E-1550 zero-order 1/4 wave plate zero-order manufactured by Thorlab corporation, which provides stable polarization performance over a range of wavelengths and over a range of large incidence angles.
The first application embodiment:
in this application embodiment, the system provided in the first embodiment is subjected to analog simulation, and when the initial power is 200mW, the system performs polarization-isolated echo power, and the result is shown in the following table:
| polarization power (mW) | Polarization reception efficiency |
| 186.00 | 93.00％ |
| 185.88 | 92.94％ |
| 186.02 | 93.01％ |
| 185.78 | 92.89％ |
| 186.10 | 93.05％ |
| Mean value of | 92.98％ |
As can be seen from the above table, the transmitting and receiving combined optical system of the present invention effectively isolates the emitted light from the echo light by using the polarization principle, improves the quality of the echo light beam, fully exerts the advantages of the transmitting and receiving combined optical system, and can obtain a better detection effect.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A transceiver system for isolating a transmitted light from an echo light, comprising: the method comprises the following steps: the device comprises a light source, a polarizer, a polarization splitting prism, an 1/4 wave plate, a first avalanche photodiode and a second avalanche photodiode which are coaxially arranged, wherein the first avalanche photodiode and the second avalanche photodiode are respectively and electrically connected with a signal processing system;
the light source emits non-linear polarized laser which vertically enters the polarizer to form quasi-linear polarized light which vertically enters the polarization splitting prism; the reflected light of the polarization beam splitter prism vertically enters the second avalanche photodiode, and the second avalanche photodiode transmits an input signal to a signal processing system; the transmitted light of the polarization beam splitter prism vertically enters the 1/4 wave plate, the polarization state of the transmitted light is converted from linear polarization into circularly polarized light, and the transmitted light of the 1/4 wave plate vertically enters a target to generate echo light;
the echo light vertically enters the 1/4 wave plate, the polarization state of the echo light is converted into linearly polarized light from circular polarization, and the vibration direction rotates by 90 degrees; the transmitted light of the 1/4 wave plate vertically enters the polarization beam splitter prism, the reflected light of the polarization beam splitter prism vertically enters the first avalanche photodiode, and the first avalanche photodiode transmits an echo signal to a signal processing system.
2. A combined transmitting and receiving system for separating transmitted light and echo light according to claim 1, wherein: the quarter-wave plate is a WPQ10E-1550 type zero-order 1/4 wave plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010422887.9A CN111505835A (en) | 2020-05-19 | 2020-05-19 | Transmitting and receiving combined system for isolating emitted light and echo light |
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| CN202010422887.9A CN111505835A (en) | 2020-05-19 | 2020-05-19 | Transmitting and receiving combined system for isolating emitted light and echo light |
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2020
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| CN201622111U (en) * | 2010-03-15 | 2010-11-03 | 中国计量科学研究院 | Low-noise heterodyne laser interferometer for measuring vibration |
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| CN105571516A (en) * | 2016-01-05 | 2016-05-11 | 中国科学院光电研究院 | Full field of view low frequency heterodyne interferometer |
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| CN109254304A (en) * | 2018-11-02 | 2019-01-22 | 南京信息工程大学 | A kind of laser imaging radar and a kind of method for filtering out transmitting-receiving conjunction and setting optical system stray light |
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