CN210744444U - A multi-pulse laser radar generating device, system and laser radar - Google Patents

Abstract

The utility model relates to a laser radar field, concretely relates to laser radar generating device, system and laser radar of many pulses. The utility model provides a laser radar generating device of many pulses, includes pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with each pulse amplifier's input respectively. The utility model discloses a design a laser radar generating device, system and laser radar of many pulses, can independently produce light pulse and independently enlarge, rethread optical multiplexer merges the output, can solve the problem of the follow-up pulse amplification energy of pulse consumption of earlier transmission effectively, can produce the high power, the even light pulse train of intensity.

Description

A multi-pulse laser radar generating device, system and laser radar

technical field

The utility model relates to the field of laser radar, in particular to a multi-pulse laser radar generating device, a system and a laser radar.

Background technique

Lidar has the advantages of high precision and high resolution, and has the prospect of building 3D models of surrounding areas. Lidar can be widely used in ADAS systems, such as adaptive cruise control (ACC), forward collision warning (FCW) and automatic emergency control. At the same time, it has the characteristics of accurate measurement and fast response, which is safe for human eyes. Among them, the high-power optical pulse source is the core component in the lidar.

At present, the transmitters with pulse amplifiers all work in a single pulse and cannot support the multi-pulse coding mode. This is because the energy in the pulse amplifier is exhausted by the first pulse, so that the subsequent pulse cannot be amplified, and the pulse sequence with the same peak value cannot be output.

Utility model content

The technical problem to be solved by the present invention is to provide a multi-pulse laser radar generating device, system and laser radar in view of the above-mentioned defects of the prior art, so as to solve the problem that the existing pulse amplifier cannot operate within a preset time interval (such as 100ns- 100uS) to realize the problem of uniform amplification of the pulse sequence.

The technical solution adopted by the utility model to solve the technical problem is to provide a multi-pulse laser radar generating device, which includes a pulse laser source, a pump laser source and an optical combiner, wherein the pulse laser source is provided with at least two, Moreover, a pulse amplifier for independently amplifying the corresponding pulse laser is arranged between each of the pulsed lasers and the optical combiner, and the pumping laser sources are respectively connected to the input ends of the pulsed amplifiers.

Wherein, a preferred solution is: the pulsed laser source is a pulsed seed source.

Wherein, the preferred solution is: the pulse laser intensity of the pulse laser source is the same or similar, and the amplification factor of the pulse amplifier is the same or similar.

The preferred solution is: the pulse laser frequency of the pulsed laser source 100 is 1GHz～100Hz, the number of the pulsed laser source 100 is preferably 2～100, and the time of one working cycle is 1nS～10mS.

Among them, the preferred solution is that there are multiple pulsed laser sources.

The technical solution adopted by the present invention to solve the technical problem is as follows: providing: including a pulse laser source, a pump laser source and an optical combiner, the pulse laser source is provided with at least two, and the pump laser source is provided with at least two Two, and a pulse amplifier for independently amplifying the corresponding pulse laser is arranged between each of the pulse laser and the optical combiner, and the pump laser source is respectively connected to the input end of the corresponding pulse amplifier.

Among them, the preferred solution is: an optical switch is arranged between the pump laser source and each pulse amplifier, and the pump light is input into the corresponding pulse amplifier together according to the operation selection of the pulse laser source.

The technical solution adopted by the utility model to solve the technical problem is to provide a multi-pulse laser radar generating system, which is characterized in that it includes a laser radar generating device and a control unit, and the control unit is respectively connected with the pulse laser source and the pump. The pump laser source is connected with the pulse amplifier, so as to control the luminous frequency of the pulse laser source and the pump laser source, and adjust the amplification factor of the pulse amplifier.

The technical solution adopted by the utility model to solve the technical problem is to provide a laser radar, which is characterized in that it includes the laser radar generating device, a scanning unit and a light receiving unit, and each pulsed laser of the laser radar generating device The source sequentially generates pulsed laser light, and together with the pump laser light generated by the pump laser source, is incident into the corresponding pulse amplifier, and after the pulse amplifier is independently amplified, the light is combined by the optical combiner; The laser light after the light is emitted outward, and the received reflected laser light is incident into the light receiving unit.

The beneficial effect of the present utility model is that, compared with the prior art, the present utility model can independently generate optical pulses and independently amplify them by designing a multi-pulse laser radar generating device, system and laser radar, and then pass the optical multiplexer. The combined output can effectively solve the problem that the first transmitted pulse consumes the energy of subsequent pulse amplification, and can generate a high-power, uniform-intensity optical pulse sequence.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and embodiments, in the accompanying drawings:

1 is a schematic structural diagram of a laser radar generating device of the present invention;

2 is a schematic structural diagram of a laser radar generating device based on a multi-pumped laser source of the present invention;

3 is a schematic structural diagram of a laser radar generating device based on an optical switch of the present invention;

4 is a schematic structural diagram of the laser radar generation system of the present invention;

5 is a schematic structural diagram of a laser radar generation system based on an optical switch of the present invention;

FIG. 6 is a schematic structural diagram of the laser radar of the present invention.

Detailed ways

The preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 , the present invention provides a preferred embodiment of a multi-pulse laser radar generating device.

A multi-pulse laser radar generating device, comprising a pulse laser source 100, a pump laser source 400 and an optical combiner 300, the pulse laser source 100 is provided with at least two, and each of the pulse laser and the optical combiner A pulse amplifier 200 for independently amplifying the corresponding pulsed laser light is disposed between 300 , and the pump laser source 400 is respectively connected to the input end of each pulse amplifier 200 .

Further, there are multiple pulsed laser sources 100, which are determined according to the working frequency of the pulsed laser source 100 and the working frequency required by the lidar. Of course, in order to use less pulsed laser source 100 and effectively solve the problem that the first transmitted pulse consumes the energy of subsequent pulse amplification, it is necessary to appropriately adjust the number and power of the pulsed laser source 100 according to the operating frequency required by the lidar, so as to adjust the cost, Balance between efficacy and power consumption life.

Specifically, in a working cycle, each pulsed laser source 100 is sequentially made to generate a pulsed laser in a preset sequence, and the pump laser source 400 also generates a pumping laser when each pulsed laser source 100 generates a pulsed laser The laser is input into the corresponding pulse amplifiers 200 together, and is independently amplified by the pulse amplifiers 200, and then combined into the output end through the optical combiner 300 to realize the multi-pulse working mode. Due to the consumption of the previous pulse, the energy of the subsequent pulse is insufficient. And it can realize the generation of a light pulse sequence with uniform intensity within a time interval (ie, one cycle).

If a pulsed laser source 100 generates a pulsed laser, the energy storage in the pulse amplifier 200 will be consumed, and the amplification factor of the subsequent laser pulses is much lower than the preset value, and the gain recovery of the pulse amplifier needs millisecond time, and the pulse interval cannot be issued. <100uS, pulse sequence with consistent intensity. Therefore, the multiple parallel pulsed laser light sources 100 of the present solution solve the above problems, and can emit a pulse sequence with uniform intensity of pulse interval of 1 ns to several seconds.

In this embodiment, the pulsed laser source 100 is a pulsed seed source, and the pulsed seed source is a high-speed semiconductor laser that generates optical pulses, and the time point of transmitting the pulses can be selected according to the needs of the laser radar. For example, the wavelength that can be used by high-power lidar is 1527-1570 nm, and the wavelength of the pulse seed source can reach this wavelength range.

Of course, a mode-locked laser source can also be used.

In this embodiment, the pulse laser intensity of the pulse laser source 100 is the same or similar, and the amplification factor of the pulse amplifier 200 is the same or similar. Preferably, a pulsed laser light source 100 capable of generating pulsed laser light of the same intensity, and a pulsed amplifier 200 with the same amplification factor are provided to output a detection laser signal with the same uniform intensity and periodicity. Preferably, the peak power of the seed source is 0.1-10W, and the amplification factor is 100-10,000 times, which can be adjusted by the control circuit.

In this embodiment, the pulsed laser frequency of the pulsed laser source 100 is 1GHz-100Hz, the number of the pulsed laser source 100 is preferably 2-100, and the time of one working cycle is 1nS-10mS.

As shown in FIG. 2 , the present invention provides a preferred embodiment of a multi-pulse laser radar generating device.

A multi-pulse laser radar generating device includes a pulse laser source 100, a pump laser source 400 and an optical combiner 300. The pulse laser source 100 is provided with at least two, and the pump laser source 400 is provided with at least two. Each of the pulsed lasers and the optical combiner 300 is provided with a pulse amplifier 200 for independently amplifying the corresponding pulsed laser. The pump laser sources 400 are respectively connected to the input ends of the corresponding pulse amplifiers 200 .

Compared with the multi-pulse laser radar generator shown in FIG. 1 , the multi-pulse laser radar generator of this embodiment is provided with at least two or more pump laser sources 400 , and each pulse laser source 100 may be equipped with a pump laser source. source 400, or several pulse laser sources 100 are matched with a pump laser source 400 according to a preset rule to prevent the pump light generated by the pump laser source 400 from reaching a predetermined intensity when the number of pulse laser sources 100 is sufficient, or, The pump laser source 400 can generate stable pump light.

As shown in FIG. 3 , the present invention provides a preferred embodiment of the pump laser source.

An optical switch 500 is arranged between the pump laser source 400 and each pulse amplifier 200 , and the pump light is simultaneously input to the corresponding pulse amplifier 200 according to the operation selection of the pulse laser source 100 .

Through the selection of the optical switch 500, the pump light generated by the pulsed laser source 100 is sent to a pulse amplifier 200, and is independently amplified in the same pulse amplifier 200 together with the newly generated pulsed laser, effectively reducing the number of devices. It also does not affect the normal operation of the lidar generator.

As shown in FIG. 4 and FIG. 5 , the present invention provides a preferred embodiment of a laser radar generation system.

A multi-pulse laser radar generation system, including a laser radar generation device, and a control unit 600, the control unit 600 is respectively connected with a pulsed laser source 100, a pump laser source 400 and a pulse amplifier 200 to control and connect the pulsed laser source. 100 and the luminous frequency of the pump laser source 400, and adjust the amplification factor of the pulse amplifier 200.

Specifically, during the operation of the control unit 600, the control unit 600 sequentially causes each pulsed laser source 100 to generate a pulsed laser in a preset sequence, and the control unit 600 simultaneously controls the pumping laser source 400 to generate a pulsed laser at each pulsed laser source 100. At the same time as the pulsed laser, a pump laser is also generated, which is input into the corresponding pulse amplifiers 200 together, and is independently amplified by each pulse amplifier 200. By controlling the luminous frequency of the pulsed laser source 100 and the pumped laser source 400, multi-pulse is realized. The working mode of the laser.

Further, and referring to FIG. 5 , an optical switch 500 is provided between the pump laser source 400 and each pulse amplifier 200 , and the pump light is input into the corresponding pulse amplifier 200 according to the operation selection of the pulse laser source 100 . , when the control unit 600 controls the pump laser source 400 to work, the control unit 600 also controls the optical switch 500 to select a channel to be connected to a pulse amplifier 200 .

As shown in FIG. 6 , the present invention provides a preferred embodiment of a laser radar.

A laser radar includes a laser radar generating device 10, a scanning unit 20 and a light receiving unit 30. Each pulsed laser source 100 of the laser radar generating device 10 sequentially generates pulsed laser light, and is combined with the pump laser generated by the pump laser source 400. The laser beams are incident on the corresponding pulse amplifiers 200 together, and after the independent amplification of the pulse amplifiers 200, they are combined by the optical combiner 300; The reflected laser light is incident into the light receiving unit 30 .

Specifically, the laser radar generating device 10 emits a laser signal, which is a multi-pulse laser, and generates a light pulse sequence with uniform intensity within a time interval (ie, one cycle); after that, the scanning unit 20 performs detection in the scanning area, and in the During the detection process, the foreign objects encountered are reflected back to the scanning unit 20 and reflected back to the light receiving unit 30 to realize lidar detection.

The above are only the best embodiments of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the scope of the patent application of the present invention are all covered by the present invention.

Claims (9)

1. a multi-pulse laser radar generating device, it is characterized in that: comprise pulse laser source, pump laser source and optical combiner, described pulse laser source is provided with at least two, and each described pulse laser and photosynthesis A pulse amplifier for independently amplifying the corresponding pulse laser is arranged between the wave devices, and the pump laser source is respectively connected to the input end of each pulse amplifier. 2 . The laser radar generating device according to claim 1 , wherein the pulsed laser source is a pulsed seed source. 3 . 3 . The lidar generating device according to claim 1 , wherein the pulse laser intensity of the pulse laser source is the same or similar, and the amplification factor of the pulse amplifier is the same or similar. 4 . 4 . The laser radar generating device according to claim 1 , wherein the pulse laser frequency of the pulse laser source is 1GHz～100Hz, and the number of the pulse laser source is 2～100, and one working cycle The time is 1nS ~ 10mS. 5 . The laser radar generating device according to claim 1 , wherein a plurality of the pulsed laser sources are provided. 6 . 6. A multi-pulse laser radar generating device, characterized in that it comprises a pulse laser source, a pump laser source and an optical combiner, the pulse laser source is provided with at least two, and the pump laser source is provided with at least two. Two, and a pulse amplifier for independently amplifying the corresponding pulse laser is arranged between each of the pulse laser and the optical combiner, and the pump laser source is respectively connected to the input end of the corresponding pulse amplifier. 7. The laser radar generating device according to claim 1 or 6, wherein an optical switch is arranged between the pump laser source and each pulse amplifier, and the pump light is selected together according to the operation of the pulse laser source. input to the corresponding pulse amplifier. 8. A multi-pulse laser radar generating system, characterized in that: comprising the laser radar generating device as described in any one of claims 1-7, and a control unit, the control unit is respectively associated with a pulsed laser source, a pump laser The source is connected with the pulse amplifier, so as to control the luminous frequency of the pulse laser source and the pump laser source, and adjust the amplification factor of the pulse amplifier. 9. A laser radar, characterized in that: comprising the laser radar generating device according to any one of claims 1-7, a scanning unit and a light receiving unit, and each pulsed laser source of the laser radar generating device sequentially generates pulsed laser light , and is incident into the corresponding pulse amplifier together with the pump laser generated by the pump laser source, and after the pulse amplifier is independently amplified, it is combined by the optical combiner; external emission, and the received reflected laser light is incident into the light receiving unit.

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