CN115061145A - VCSEL-based multifunctional tunable laser system - Google Patents

VCSEL-based multifunctional tunable laser system Download PDF

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Publication number
CN115061145A
CN115061145A CN202210695741.0A CN202210695741A CN115061145A CN 115061145 A CN115061145 A CN 115061145A CN 202210695741 A CN202210695741 A CN 202210695741A CN 115061145 A CN115061145 A CN 115061145A
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module
optical
vehicle
optical power
micro
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程立文
刘鹏飞
陈志朋
张家荣
罗雨中
张曦晨
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Yangzhou University
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Yangzhou University
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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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • 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
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • 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
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
    • H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention discloses a VCSEL-based multifunctional tunable laser system, which comprises: the emitting module comprises a vertical cavity surface emitting laser; the lens module comprises a first lens module and a second lens module; the second lens module comprises a micro-optical type adjustable optical power distributor; the receiving module is used for collecting and applying the light beam output by the micro-optical adjustable optical power distributor; the control module is used for controlling the micro-optical type adjustable optical power distributor to change the optical power of each output end of the micro-optical type adjustable optical power distributor; the micro-optical type adjustable optical power distributor comprises a half-wave plate and a rotating mechanism for controlling the rotation of the half-wave plate; the control module comprises a control unit and an external monitoring module; the external monitoring module is used for acquiring external data related to optical power distribution and sending the external data to the control unit; the control unit sends a control signal to the rotating mechanism; the rotating mechanism is used for adjusting the angle between the optical axis of the half-wave plate and the vibration direction of the input light.

Description

VCSEL-based multifunctional tunable laser system
Technical Field
The invention belongs to the technical field of laser radars, and particularly relates to a VCSEL-based multifunctional tunable laser system.
Background
Laser systems are mainly used for ranging, image scanning, pollution detection, information processing, surface three-dimensional drawing and the like at present, and are developed in the fields of unmanned aerial vehicles, automatic automobile driving and the like as an important electro-optical combination system. The laser system mainly comprises a laser emitting module, a lens module, a receiving module, a signal processing module and the like. In the working principle, the laser system emits light beams through stimulated emission of the laser, the light beams are irradiated onto a target object through the lens system, and then are reflected and fed back to the receiving module. And measuring the propagation distance between the receiving end, the transmitting end and the target object, and analyzing the energy intensity of light reflected by the surface of the target object, the amplitude, the phase, the frequency and the speed of the emitted light, so as to analyze the accurate information of the target object.
The transmitting module comprises a laser transmitter. The semiconductor laser takes semiconductor materials as gain media, and has the characteristics of high-efficiency photoelectric conversion, low cost, reliable use and the like. According to the laser projection division, the semiconductor laser emitting parts are mainly divided into two types, namely an edge-emitting laser EEL and a surface-emitting laser. Compared with an edge-emitting laser, a vertical cavity surface laser (VCSEL) has the advantages of simple structure, stable wavelength, small size, no cavity surface threshold damage, higher light beam quality, high coupling efficiency, capability of being manufactured into a one-dimensional or two-dimensional array, easiness in adaptive coupling with optical fibers, capability of being changed at any time according to different requirements, single longitudinal mode, high quality and low price, low power consumption and the like. Over time, today's vertical cavity surface lasers (VCSELs) may also participate in tuning.
Compared with the traditional semiconductor Laser (LD), the vertical cavity surface laser (VCSEL) has the characteristics of small divergence angle of output light beams, circular light spot output and the like, simplifies the coupling link, has high reliability and wide working temperature range, and can better meet the requirements of modern industrial lasers. In addition, the electro-optic conversion efficiency is much higher than that of all lasers in the same class. The requirements for required driving voltage and current are low, single-channel and parallel optical transmission and optical interconnection can be carried out, the output power is high, the energy utilization rate is high, the packaging is simple, the cost is low, the service life is long, and the like, so that the optical fiber is well accepted and favored. The defects in the art are that the effective distance detected by a vertical cavity surface laser (VCSEL) is relatively small, and multiple stages of optical amplification are required to meet daily use requirements.
In a laser system, it is important to discuss how to improve the signal-to-noise ratio of a system beam, filter stray light, and design the structure of the laser system to meet the needs of daily production and life.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problem that the conventional laser system based on a vertical cavity surface laser cannot meet daily use requirements, the invention provides a VCSEL-based multifunctional tunable laser system, which can eliminate fluorescent signals, natural scattered light signals, light signals oscillated inside a structure and other background clutter signals as far as possible to improve the signal-to-noise ratio of output signals.
The technical scheme is as follows: a VCSEL-based multifunctional tunable laser system, comprising: the device comprises a transmitting module, a lens module, a receiving module and a control module; an emission module for emitting laser including a vertical cavity surface emitting laser; the lens module comprises a first lens module for emitting laser to a target object and a second lens module for receiving a reflected light beam of the target object; the second lens module comprises a micro-optical type adjustable optical power distributor; the receiving module is used for collecting and applying the light beam output by the micro-optical type adjustable optical power distributor; the control module is used for controlling the micro-optical type adjustable optical power distributor to change the optical power of each output end of the micro-optical type adjustable optical power distributor; the micro-optical adjustable optical power distributor comprises a half-wave plate and a rotating mechanism for controlling the rotation of the half-wave plate; the control module comprises a control unit and an external monitoring module; the external monitoring module is used for acquiring external data related to optical power distribution and sending the external data to the control unit; the control unit is used for comparing the external data with preset conditions and sending a control signal to the rotating mechanism according to a comparison result; the rotating mechanism is used for adjusting the angle between the optical axis of the half-wave plate and the vibration direction of input light according to the control signal, and optical power distribution is achieved.
Further, the first lens module sequentially comprises a beam expander, a collimating lens, a reflector and a first resonant cavity according to a light path.
Furthermore, the second lens module sequentially comprises a second resonant cavity, a Fourier transform lens, a narrow-band optical filter and a micro-optical type adjustable optical power distributor according to an optical path.
Further, the vertical cavity surface emitting laser is a bottom emitting vertical cavity surface emitting laser.
Further, the external monitoring module is a speed monitoring module, and the speed monitoring module is used for acquiring the running speed of the vehicle; when the running speed of the vehicle exceeds the preset condition, the control unit sends a control signal to the rotating mechanism, so that different vehicle speeds correspond to different light power distributions.
Furthermore, the receiving module comprises a distance measuring module and an image scanning module; the distance measuring module is connected with one output end of the micro-optical adjustable optical power distributor; the image scanning module is connected with the other output end of the micro-optical adjustable optical power distributor.
Furthermore, the angle between the optical axis of the half-wave plate and the vibration direction of the input light is set to be theta, and the incident light intensity is set to be I 0 And the light intensity received by the distance measuring module is marked as I 1 ＝I 0 *cos 2 Theta, the light intensity received by the image scanning module is marked as I 2 ＝I 0 *sin 2 θ；
When the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels When equal to 0, θ is equal to 45 °;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels Satisfy 0km/h < v Vehicle with wheels When the speed is less than or equal to 40km/h, the rotating mechanism controls the half-wave plate to rotate to enable thetaIncrease to satisfy theta 45+0.375v Vehicle with wheels Stopping until theta is 60 degrees;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels Satisfy 40km/h < v Vehicle with wheels When the speed is less than or equal to 120km/h, the rotating mechanism controls the half-wave plate to rotate so as to reduce theta, and theta is 75-0.375v Vehicle with wheels Stopping until theta is 30 degrees;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels When the rotation speed exceeds 120km/h, the rotation mechanism controls the half-wave plate to rotate so that theta is equal to 0 deg.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) by adopting the narrow-band filter, the influence of other external background clutter signals on the system transmission information is reduced while the light beam is controlled to only receive the light transmission radiated in a certain range, the signal-to-noise ratio of the system is improved, the accuracy of a detection result is ensured, and the stability of the structure operation is improved;
(2) the invention utilizes devices such as a resonant cavity, a Fourier transform lens and the like to ensure the stability and high power of light beam output, and adjusts the power distribution through the micro-optical adjustable light power distributor, thereby flexibly realizing the emphasis on the use of system functions in a certain sense.
Drawings
FIG. 1 is a basic schematic diagram of a laser system and a target object (obstacle) during automatic driving of a vehicle;
FIG. 2 is a layout diagram of the design elements of the present invention;
FIG. 3 is an internal schematic diagram of a micro-optic type dimmable power splitter;
fig. 4 shows the optical power allocation trigger condition of example 1.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
The invention relates to a VCSEL-based multifunctional tunable laser system, which comprises: a transmitting module 1, a lens module, a receiving module 11 and a digital control circuit 9.
The inventive transmitter module 1 comprises mainly Vertical Cavity Surface Emitting Lasers (VCSELs) which can be designed in one-dimensional or two-dimensional arrays to meet specific use contexts. The Vertical Cavity Surface Emitting Laser (VCSEL) of the present invention is a bottom emission VCSEL (a semiconductor laser emitting laser light perpendicular to a substrate surface), and has a main structure consisting of an active layer, a Distributed Bragg Reflector (DBR), and a substrate. The reflectivity of a Bragg reflector (DBR) is high, a laser system is excited to radiate under the power-up condition, the loss of carriers is limited by the blocking of an active layer, and emergent laser is formed by oscillation under the continuous reflection of the Bragg reflector by adjusting the length of a resonant cavity in a laser. Compared with the traditional laser, the bottom-emitting vertical cavity surface emitting laser has better beam quality, does not need to use a beam shaping system with a complex structure and high price, and is easy for two-dimensional dense integration in actual production. Compared with other members in the semiconductor laser, the Vertical Cavity Surface Emitting Laser (VCSEL) can obtain a larger relaxation oscillation frequency, thereby being capable of high-frequency modulation, and the light emitting efficiency is much higher than that of other LD lasers. And the VCSEL has low requirements on required driving voltage and current and can be realized very small. Under the condition of single-mode fiber output, the reduction of the cavity enables the spontaneous emission factor of the single-mode fiber to be several orders of magnitude higher than that of a common laser, and the overall physical characteristics of the single-mode fiber are greatly improved. Compared with the traditional LD laser with high price, the manufacturing process is similar to that of an LED, so the manufacturing cost is low, and the laser is suitable for large-scale low-cost manufacturing. In the field of parallel optical transmission and parallel optical interconnection, the novel optical fiber has a wide development prospect, more outstanding heat dissipation performance, wide working temperature range and long service life.
The vertical cavity surface laser (VCSEL) is based on GaAs material and is commonly used in near infrared wave band. The 850nm vertical cavity surface laser (VCSEL) is selected as an emission source, the laser has the advantages of strong anti-interference capability, convenience for large-density integration, tunability, less lost light beam energy due to the fact that low frequency is superposed to high frequency and emitted out in a radio frequency signal mode, stronger penetrating power compared with visible light, capability of scanning road conditions in severe weather such as heavy fog, rain, sand storms and the like, capability of realizing application of the laser radar in the field of intelligent automobile driving in a larger temperature range and the like.
Referring to fig. 2, the lens module of the present invention mainly includes a beam expander 2, a collimating lens 3, a reflector 4, a resonant cavity 5, a fourier transform lens 7, a narrowband optical filter 8 and a micro-optical tunable optical power splitter 10; the positions of the optical elements will now be further described with reference to the optical paths. The transmitting module sends out high-frequency stable radio frequency optical signals, light beams are distributed uniformly, and light spot energy is uniform. The optical signal propagates in the lens group part in the structure until the optical signal is reflected after hitting a target object. The reflecting mirror adopts 2 blocks which are arranged up and down, so that incident light and emergent light are parallel. The resonant cavity 5 of the present invention includes a first resonant cavity and a second resonant cavity.
Under an external power supply, the interior of a vertical cavity surface laser (VCSEL) is excited to radiate, and high-frequency stable emergent laser is obtained under the oscillation tuning of a p-pole Bragg reflector and an n-pole Bragg reflector;
the emergent laser is expanded by the beam expander 2, so that the divergence range of the emergent laser is enlarged;
the output beam of the beam expander passes through a collimating lens 3 which enables a stable unidirectional emission of the beam.
The output light beam of the collimating lens 3 is reflected twice and then enters the first resonant cavity, the first resonant cavity is used for realizing the coupling of the light path and improving the light power, so that the light beam can be transmitted farther without generating large energy loss, namely, the incident light beam is strengthened.
The output light beam of the first resonant cavity is irradiated on a receiving target object, and the narrow-band filter is used for weakening the influence of natural light on structural parameters and improving the actual signal-to-noise ratio.
And after the light beam output by the narrow-band filter hits a receiving target object, the light beam returns to the second resonant cavity, and the light beam is reinforced in the second resonant cavity so as to reduce the optical power loss. The wavelength of the light beam reflected by the target is consistent with the wavelength of the laser emitted by the stimulated radiation of the emission module.
The light beam output by the second resonant cavity is incident to the Fourier transform lens 7, and the Fourier transform lens 7 is arranged for collecting the reflected light beam, ensuring the concentration of the light beam energy and reducing the escape of the signal energy.
The output light beam of the fourier transform lens 7 passes through the narrow band filter 8 to obtain a relatively pure light beam, and then enters the micro-optical adjustable optical power distributor 10, wherein the narrow band filter 8 is used for selectively reducing the interference of solar scattered light, fluorescent signals and the like on effective optical signals, better filtering clutter signals and improving the accuracy of feedback data.
When the light beam passes through the micro-optical adjustable optical power distributor 10, the digital control circuit 9 sends a digital control electrical signal to the micro-optical adjustable optical power distributor 10 for controlling the distribution of the optical power on each optical path.
The light beam output by the micro-optical type adjustable optical power distributor 10 is collected by the receiving module 11, and according to the distribution of the optical power, the light beam output by the micro-optical type adjustable optical power distributor can realize multiple functions, for example, the light beam can be converted into an electric signal by an external detection circuit to participate in the working operation of an automatic driving automobile. In order to reduce the transmission loss of the light beam in each element, an optical power amplifier can be added at the output end of the lens module, namely the output end of the micro-optical type adjustable optical power distributor.
As shown in fig. 3, the micro-optical type dimmable power splitter 10 of the present invention mainly includes an input end single-fiber collimator 101, a half-wave plate 102, a birefringent crystal 103, a roof prism 104, an output end double-fiber collimator 105, and a rotation mechanism (not shown in fig. 3) that controls rotation of the half-wave plate; light beams enter from the single-fiber collimator 101 at the input end, are adjusted in polarization state through the half-wave plate 102, and are output after being split and coupled.
The receiving module 11 of the present invention is used for collecting the light beam output by the lens module for the subsequent circuit to operate, for example, converting the optical signal into an electrical signal to participate in the working operation of the automatic driving automobile, where the participation includes but is not limited to participating in distance measurement or participating in image scanning, etc.
The digital control circuit 9 of the invention comprises a control unit and an external monitoring module; and the external monitoring module and the rotating mechanism are both connected with the control unit.
The external monitoring module is used for acquiring external data related to optical power distribution, the control unit receives the external data acquired by the external monitoring module, compares the external data with a preset condition, and sends an electric signal to the rotating mechanism according to a comparison result to enable the rotating mechanism to rotate the half-wave plate and adjust the angle between the optical axis of the half-wave plate and the vibration direction of input light, so that the optical power distribution of the micro-optical dimmable power distributor 10 is adjusted. The invention can also carry out optical power distribution control on the micro-optical adjustable optical power distributor without adopting a digital control circuit 9, and can directly adopt manual modulation.
Example 1:
fig. 1 shows a schematic view of applying the laser system of the present invention to automatic driving of a vehicle, where a transmitting module of the laser system transmits laser, the laser is reflected after encountering a target object (obstacle), and the reflected light beam is collected by a receiving module of the laser system for further analysis and processing. The external monitoring module of this embodiment is a speed monitoring module, and this speed monitoring module is used for obtaining the speed of going of vehicle, and when its speed exceeded predetermined speed threshold condition, the control unit sent the signal of telecommunication to rotary mechanism, ensures to realize the signal reasonable side weight distribution to range finding and image scanning under the different speed of a motor vehicle condition.
In this embodiment, two output ports of the micro-optical tunable optical power splitter are set, the angle between the optical axis of the half-wave plate and the vibration direction of the input light is set to be θ, and the incident light intensity is set to be I 0 The light intensity of the two ports of the output end is respectively a distance measurement port I 1 ＝I 0 *cos 2 θ, image scanning port I 2 ＝I 0 *sin 2 Theta, the default initial, i.e. allocation ratio is 50:50 when the vehicle is stationary, when the angle of theta is 45 deg..
As shown in FIGS. 3-4, when the vehicle is at low speed (0km/h < v) Vehicle with wheels Less than or equal to 40km/h), a higher proportion of the light signals is used for image scanning, the angle theta is set as a function of the speed v Vehicle with wheels The lift is gradually increased, and the two satisfy the condition that theta is 45+0.375v Vehicle with wheels Continuously carrying out short-distance high-precision scanning on the vehicle until the angle is 60 degrees, and using a small part of the scanning for distance measurement; when the vehicle keeps high speed (40km/h < v) Vehicle with wheels Not more than 120km/h) driving, setting the angle theta along with the speed v Vehicle with wheels The lift gradually decreases, and the two satisfy the condition that theta is 75-0.375v Vehicle with wheels Until the angle is 30 degrees, most optical signals are used for ranging, the distance and accuracy of ranging are ensured, and a small part of optical signals are used for far-field low-precision image scanning; when the vehicle speed v is Vehicle with a detachable front cover When the speed exceeds 120km/h, the theta is suddenly changed to be 0 degrees directly, and all optical signals act on distance measurement to realize vehicle distance control and timely avoid the front obstacles.

Claims (7)

1. A VCSEL-based multifunctional tunable laser system, characterized by: the method comprises the following steps: the device comprises a transmitting module, a lens module, a receiving module and a control module;
the emitting module is used for emitting laser and comprises a vertical cavity surface emitting laser;
the lens module comprises a first lens module for emitting laser to a target object and a second lens module for receiving a reflected light beam of the target object; the second lens module comprises a micro-optical type adjustable optical power distributor;
the receiving module is used for collecting and applying the light beam output by the micro-optical type adjustable optical power distributor;
the control module is used for controlling the micro-optical type adjustable optical power distributor to change the optical power of each output end of the micro-optical type adjustable optical power distributor;
wherein the micro-optical type adjustable optical power splitter includes a half-wave plate and a rotation mechanism controlling rotation of the half-wave plate;
the control module comprises a control unit and an external monitoring module;
the external monitoring module is used for acquiring external data related to optical power distribution and sending the external data to the control unit;
the control unit is used for comparing external data with preset conditions and sending a control signal to the rotating mechanism according to a comparison result;
the rotating mechanism is used for adjusting the angle between the optical axis of the half-wave plate and the vibration direction of input light according to the control signal, and optical power distribution is achieved.
2. A VCSEL-based multifunctional tunable laser system in accordance with claim 1, wherein: the first lens module sequentially comprises a beam expander, a collimating lens, a reflector and a first resonant cavity according to a light path.
3. A VCSEL-based multifunctional tunable laser system in accordance with claim 1, wherein: the second lens module sequentially comprises a second resonant cavity, a Fourier transform lens, a narrow-band optical filter and a micro-optical type adjustable optical power distributor according to an optical path.
4. A VCSEL-based multifunctional tunable laser system in accordance with claim 1, wherein: the vertical cavity surface emitting laser is a bottom emitting vertical cavity surface emitting laser.
5. A VCSEL-based multifunctional tunable laser system in accordance with claim 1, wherein: the external monitoring module is a speed monitoring module and is used for acquiring the running speed of the vehicle;
when the running speed of the vehicle exceeds the preset condition, the control unit sends a control signal to the rotating mechanism, so that different vehicle speeds correspond to different light power distributions.
6. A VCSEL-based multifunctional tunable laser system according to claim 5, wherein: the receiving module comprises a distance measuring module and an image scanning module;
the distance measuring module is connected with one output end of the micro-optical adjustable optical power distributor;
the image scanning module is connected with the other output end of the micro-optical adjustable optical power distributor.
7. A VCSEL-based multifunctional tunable laser system according to claim 6, wherein:
setting the angle between the optical axis of the half-wave plate and the vibration direction of the input light as theta, and the incident light intensity as I 0 And the light intensity received by the distance measuring module is marked as I 1 ＝I 0 *cos 2 Theta, the light intensity received by the image scanning module is recorded as I 2 ＝I 0 *sin 2 θ；
When the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels When 0, θ is 45 °;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels Satisfy 0km/h < v Vehicle with wheels When the speed is less than or equal to 40km/h, the rotating mechanism controls the half-wave plate to rotate to increase theta, and theta is 45+0.375v Vehicle with wheels Stopping until theta is 60 degrees;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels Satisfy 40km/h < v Vehicle with wheels When the speed is less than or equal to 120km/h, the rotating mechanism controls the half-wave plate to rotate to reduce theta, and theta is 75-0.375v Vehicle with a detachable front cover Stopping until theta is 30 degrees;
when the vehicle running speed v acquired by the speed monitoring module Vehicle with wheels When the speed exceeds 120km/h, the rotating mechanism controls the half-wave plate to rotate so that theta is equal to 0 deg.
CN202210695741.0A 2022-06-20 2022-06-20 VCSEL-based multifunctional tunable laser system Pending CN115061145A (en)

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CN202210695741.0A CN115061145A (en) 2022-06-20 2022-06-20 VCSEL-based multifunctional tunable laser system

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Application Number Priority Date Filing Date Title
CN202210695741.0A CN115061145A (en) 2022-06-20 2022-06-20 VCSEL-based multifunctional tunable laser system

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CN115061145A true CN115061145A (en) 2022-09-16

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