CN110927700A - Laser echo control light path for protecting receiving detector - Google Patents
Laser echo control light path for protecting receiving detector Download PDFInfo
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- CN110927700A CN110927700A CN201911103481.8A CN201911103481A CN110927700A CN 110927700 A CN110927700 A CN 110927700A CN 201911103481 A CN201911103481 A CN 201911103481A CN 110927700 A CN110927700 A CN 110927700A
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- polarization beam
- beam splitter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a laser echo control light path for protecting a receiving detector, which adopts a polarization beam splitter to carry out polarization separation on laser echoes, adopts an electro-optic crystal to carry out polarization rotation control on two light path channels respectively, and then utilizes the polarization beam splitter to carry out light path beam combination, thereby realizing the control of the on-off of a receiving echo light path by controlling an electric field on the electro-optic crystal. The invention has no polarization requirement on received echo light, has small loss on the original light path, high response speed (up to ns level), high contrast (up to more than 30 dB) and can protect a receiving detector to the maximum extent.
Description
Technical Field
The invention belongs to a laser receiving echo control technology, and relates to a laser echo control light path for protecting a receiving detector.
Background
Laser range finders generally employ high-sensitivity detectors for receiving laser echoes, thereby improving laser range finding capabilities. However, the high sensitivity of the receiving detector also makes the detector very vulnerable, especially when two distance measuring machines are used for measuring distance, the laser emitted by one distance measuring machine will be irradiated on the detector of the other distance measuring machine, and exceed the damage threshold of the detector, thereby causing the damage of the detector and causing the working failure of the distance measuring machines.
Due to the fact that the protection of laser echo is not provided, when the distance measuring machines measure distance mutually, the laser detector is damaged.
Therefore, it is necessary to design a laser echo control method for protecting the receiving detector, so that when the range finder measures the distance from each other, the laser detector can be prevented from being damaged, thereby improving the adaptability of the laser range finder.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a laser echo control light path for protecting a receiving detector.
Technical scheme
A laser echo control optical path for protecting a receiving detector is characterized by comprising a first polarization beam splitter 1, a second polarization beam splitter 2, a third polarization beam splitter 5, a fourth polarization beam splitter 6, a first electro-optic crystal 3, a second electro-optic crystal 4, a first absorber 7 and a second absorber 8; the first polarization beam splitter 1 receives the received light to form two optical paths, one of which is: the first polarization beam splitter 1 is followed by a second electro-optic crystal 4 and a fourth polarization beam splitter 6; the second step is as follows: the second polarization beam splitter 2 is positioned on a reflected light path of the first polarization beam splitter 1, the first electro-optical crystal 3 is positioned on the reflected light path of the second polarization beam splitter 2, a third polarization beam splitter 5 and a first absorber 7 are arranged behind the first electro-optical crystal 3, and the fourth polarization beam splitter 6 is positioned on the reflected light path of the third polarization beam splitter 5; the two light paths are combined by the fourth polarization beam splitter 6 to enter a subsequent receiving light path and enter a second absorber 8 at the same time; the first electro-optic crystal 3 and the second electro-optic crystal 4 simultaneously apply no electric field or an electric field.
The strength of the electric field applied by the first electro-optical crystal 3 and the second electro-optical crystal 4 enables the polarization direction of the linear polarization light passing through the electro-optical crystal to rotate by 90 degrees.
The four polarization beam splitters adopt polarization beam splitting prisms or polarization beam splitting plates.
The two electro-optical crystals KD x P crystal, lithium niobate crystal, KTP crystal, paired RTP crystal, BBO crystal or langasite crystal.
The two absorbers adopt grey glass, heat insulation glass or absorption type crystals.
Advantageous effects
The invention provides a laser echo control light path for protecting a receiving detector, which adopts a polarization beam splitter to carry out polarization separation on laser echoes, adopts an electro-optic crystal to carry out polarization rotation control on two light path channels respectively, and then utilizes the polarization beam splitter to carry out light path beam combination, thereby realizing the control of the on-off of a receiving echo light path by controlling an electric field on the electro-optic crystal. The invention has no polarization requirement on received echo light, has small loss on the original light path, high response speed reaching ns level, high contrast ratio reaching more than 30dB, and can protect a receiving detector to the maximum extent.
Drawings
FIG. 1: laser echo control light path diagram for protecting receiving detector
1-a first polarizing beam splitter, 2-a second polarizing beam splitter, 3-a first electro-optic crystal, 4-a second electro-optic crystal, 5-a third polarizing beam splitter, 6-a fourth polarizing beam splitter, 7-a first absorber, 8-a second absorber.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the laser echo is polarized and separated into two light path channels by adopting a polarization beam splitter, polarization rotation control is carried out on the two light path channels by adopting an electro-optic crystal respectively, and light path beam combination is carried out by utilizing the polarization beam splitter to enter a subsequent receiving light path. When no electric field is applied to the electro-optic crystal, the polarization state of linearly polarized light passing through the electro-optic crystal is not changed, so that the linearly polarized light can be combined by the polarization beam splitter and enter a subsequent receiving light path. When an appropriate electric field is applied to the electro-optic crystal, linearly polarized light passes through the electro-optic crystal, rotates in the polarization direction by 90 degrees, is reflected or transmitted by the polarization beam splitter, deviates from a receiving light path and enters the absorber. Therefore, the switch of the receiving echo light path can be controlled by controlling the electric field applied to the electro-optical crystal. When two distance measuring machines measure distance mutually, because the time of initial laser emission is random, as long as the electric field power-on time of the electro-optical crystal is associated with the time sequence of laser emission, the receiving light path can be ensured to be opened only when the echo of the self distance measuring machine arrives, and the laser of other distance measuring machines is closed when the laser arrives, thereby protecting the receiving detector.
The device specifically comprises a first polarization beam splitter 1, a second polarization beam splitter 2, a third polarization beam splitter 5, a fourth polarization beam splitter 6, a first electro-optic crystal 3, a second electro-optic crystal 4, a first absorber 7 and a second absorber 8.
The light path structure is: the first polarization beam splitter 1 receives the received light to form two optical paths, one of which is: the first polarization beam splitter 1 is followed by a second electro-optic crystal 4 and a fourth polarization beam splitter 6; the second step is as follows: the second polarization beam splitter 2 is positioned on a reflected light path of the first polarization beam splitter 1, the first electro-optical crystal 3 is positioned on the reflected light path of the second polarization beam splitter 2, a third polarization beam splitter 5 and a first absorber 7 are arranged behind the first electro-optical crystal 3, and the fourth polarization beam splitter 6 is positioned on the reflected light path of the third polarization beam splitter 5; the two optical paths are combined by the fourth polarization beam splitter 6 to enter a subsequent receiving optical path and enter a second absorber 8 at the same time.
The polarization beam splitter reflects vertically polarized light and transmits horizontally polarized light, and can be a polarization beam splitter prism or a polarization beam splitter plate.
The electro-optic crystal can rotate the polarization direction of linearly polarized light by 90 degrees and can be a KD x P crystal, a lithium niobate crystal, a KTP crystal, a pair RTP crystal, a BBO crystal and a langasite crystal.
The absorber can absorb the received echo laser, and can be gray glass, heat insulation glass or absorption type crystal.
The process of protecting the laser echo control light path of the receiving detector comprises the following steps:
when no electric field is applied to the electro- optical crystals 3 and 4, the path traveled by the received echo light is as follows:
1, receiving echo light, and dividing the echo light into two paths of light when the echo light passes through a polarization beam splitter 1;
2, reflecting the vertical polarization component in the received echo when passing through the polarization beam splitter 1, reaching the polarization beam splitter 2, continuously reflecting, passing through the electro-optic crystal 3, reflecting when reaching the polarization beam splitter 5, reaching the polarization beam splitter 6, and continuously reflecting to enter a subsequent receiving light path;
and 3, transmitting the horizontal polarization component in the received echo when passing through the polarization beam splitter 1, transmitting the horizontal polarization component when reaching the polarization beam splitter 6 after passing through the electro-optic crystal 4, and entering a subsequent receiving optical path.
When the electro- optical crystals 3 and 4 are simultaneously applied with a proper electric field, the path traveled by the received echo light is as follows:
the proper electric field ensures that the polarization direction of the linear polarization light rotates by 90 degrees after passing through the electro-optic crystal.
1, receiving echo light, and dividing the echo light into two paths of light when the echo light passes through a polarization beam splitter 1;
2, reflecting the vertical polarization component in the received echo when passing through the polarization beam splitter 1, reaching the polarization beam splitter 2, continuously reflecting, passing through the electro-optic crystal 3, transmitting when reaching the polarization beam splitter 5, and entering an absorber 7;
and 3, transmitting the horizontal polarization component in the received echo when passing through the polarization beam splitter 1, passing through the electro-optical crystal 4, reflecting when reaching the polarization beam splitter 6, and entering an absorber 8.
Therefore, the on-off of the receiving echo light path can be controlled by controlling the electric fields on the electro- optical crystals 3 and 4.
Claims (5)
1. A laser echo control optical path for protecting a receiving detector is characterized by comprising a first polarization beam splitter (1), a second polarization beam splitter (2), a third polarization beam splitter (5), a fourth polarization beam splitter (6), a first electro-optic crystal (3), a second electro-optic crystal (4), a first absorber (7) and a second absorber (8); the first polarization beam splitter (1) receives the received echo light to form two optical paths, one of which is as follows: the second electro-optical crystal (4) and the fourth polarization beam splitter (6) are arranged behind the first polarization beam splitter (1); the second step is as follows: the second polarization beam splitter (2) is positioned on a reflection light path of the first polarization beam splitter (1), the first electro-optic crystal (3) is positioned on the reflection light path of the second polarization beam splitter (2), a third polarization beam splitter (5) and a first absorber (7) are arranged behind the first electro-optic crystal (3), and the fourth polarization beam splitter (6) is positioned on the reflection light path of the third polarization beam splitter (5); the two light paths are combined through a fourth polarization beam splitter (6) to enter a subsequent receiving light path and enter a second absorber (8) at the same time; the first electro-optical crystal (3) and the second electro-optical crystal (4) simultaneously apply no electric field or an electric field.
2. The laser echo control optical path for protecting a receiving detector according to claim 1, wherein: the strength of the electric field applied by the first electro-optical crystal (3) and the second electro-optical crystal (4) enables the polarization direction of the linearly polarized light to rotate by 90 degrees after passing through the electro-optical crystals.
3. The laser echo control optical path for protecting a receiving detector according to claim 1, wherein: the four polarization beam splitters adopt polarization beam splitting prisms or polarization beam splitting plates.
4. The laser echo control optical path for protecting a receiving detector according to claim 1, wherein: the two electro-optical crystals KD x P crystal, lithium niobate crystal, KTP crystal, paired RTP crystal, BBO crystal or langasite crystal.
5. The laser echo control optical path for protecting a receiving detector according to claim 1, wherein: the two absorbers adopt grey glass, heat insulation glass or absorption type crystals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911103481.8A CN110927700B (en) | 2019-11-13 | 2019-11-13 | Laser echo control light path for protecting receiving detector |
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| CN201911103481.8A CN110927700B (en) | 2019-11-13 | 2019-11-13 | Laser echo control light path for protecting receiving detector |
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| CN110927700B CN110927700B (en) | 2023-04-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467509A (en) * | 2020-11-12 | 2021-03-09 | 中国航空工业集团公司洛阳电光设备研究所 | Thermally stable laser for airborne ranging and irradiation |
| CN115184902A (en) * | 2022-09-13 | 2022-10-14 | 北京环境特性研究所 | Laser range finder detector protection device and protection method |
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| US20130146768A1 (en) * | 2010-08-24 | 2013-06-13 | Canon Kabushiki Kaisha | Electromagnetic wave generating device, electromagnetic wave detecting device, and time-domain spectroscopy apparatus |
| CN105572653A (en) * | 2016-01-12 | 2016-05-11 | 中国科学院半导体研究所 | Method for protecting photosensitive surface of detector |
| CN107748368A (en) * | 2017-10-19 | 2018-03-02 | 中国科学院上海天文台 | The back scattering circumvention device and method of the common light path of laser ranging transmitting-receiving |
| CN114624682A (en) * | 2022-05-17 | 2022-06-14 | 中国科学技术大学 | Method and system for suppressing near field strength echo signal |
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- 2019-11-13 CN CN201911103481.8A patent/CN110927700B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130146768A1 (en) * | 2010-08-24 | 2013-06-13 | Canon Kabushiki Kaisha | Electromagnetic wave generating device, electromagnetic wave detecting device, and time-domain spectroscopy apparatus |
| CN102593703A (en) * | 2012-01-16 | 2012-07-18 | 中国科学院理化技术研究所 | Device for judging optimal thermal balance running condition of self frequency conversion crystal |
| CN105572653A (en) * | 2016-01-12 | 2016-05-11 | 中国科学院半导体研究所 | Method for protecting photosensitive surface of detector |
| CN107748368A (en) * | 2017-10-19 | 2018-03-02 | 中国科学院上海天文台 | The back scattering circumvention device and method of the common light path of laser ranging transmitting-receiving |
| CN114624682A (en) * | 2022-05-17 | 2022-06-14 | 中国科学技术大学 | Method and system for suppressing near field strength echo signal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467509A (en) * | 2020-11-12 | 2021-03-09 | 中国航空工业集团公司洛阳电光设备研究所 | Thermally stable laser for airborne ranging and irradiation |
| CN112467509B (en) * | 2020-11-12 | 2022-09-02 | 中国航空工业集团公司洛阳电光设备研究所 | Thermally stable laser for airborne ranging and irradiation |
| CN115184902A (en) * | 2022-09-13 | 2022-10-14 | 北京环境特性研究所 | Laser range finder detector protection device and protection method |
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| CN110927700B (en) | 2023-04-28 |
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