CN206283092U - A kind of low repetition nanosecond full-optical-fiber laser for laser radar - Google Patents
A kind of low repetition nanosecond full-optical-fiber laser for laser radar Download PDFInfo
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- CN206283092U CN206283092U CN201621403554.7U CN201621403554U CN206283092U CN 206283092 U CN206283092 U CN 206283092U CN 201621403554 U CN201621403554 U CN 201621403554U CN 206283092 U CN206283092 U CN 206283092U
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Abstract
The utility model discloses a kind of low repetition nanosecond full-optical-fiber laser for laser radar, including：Main oscillations level optical fiber seed origin system and fiber amplifier system, the main oscillations level optical fiber seed origin system, nanosecond pulse signal for exporting specific pulsewidth and repetition, the pulsewidth of the nanosecond pulse flashlight is 1ns -10ns, and the repetition of the nanosecond pulse flashlight is 100KHZ -1MHZ；Fiber amplifier system device includes first order optical fiber prime amplifier, second level main amplifier, for will be exported after nanosecond pulse signal amplification by way of two grades of amplifications.The utility model design is simple, compact conformation, it is not necessary to which multi-stage fiber amplifier carries out power amplification to seed light and can be only achieved light source parameters requirement, while effectively reducing the production cost of light source.
Description
Technical field
The utility model belongs to laser technology and optical field, more particularly to a kind of low repetition nanosecond for laser radar
Level full-optical-fiber laser.
Background technology
Laser radar system combines optical detector technology and distance measurement technique, can obtain simultaneously orientation, pitching, away from
From information such as, intensity, have in fields such as forest structure estimation, urban construction, intelligence manufacture, unmanned, agriculture, Aero-Space
It is widely applied.Used as the important component of laser radar, the parameter of Optical Maser System largely determines laser
The overall performance of radar system.At present, the light source for generally using has impulse semiconductor laser, it have it is lightweight, inexpensive,
The features such as high repetition frequency, high efficiency, but it needs impulse generator to be modulated pulse, makes pulsewidth as far as possible narrow, rising edge
Meet detection accuracy requirement higher suddenly as far as possible.The peak power of other semiconductor laser is general below hectowatt magnitude,
Short-range detecting can only be carried out.Solid state laser can produce high-peak power and short-pulse laser to export, but solid state laser is very
Hardly possible obtains repetition rate higher, and output laser beam quality nor highly desirable, it is typically more difficult under high-peak power
Obtain single-mode laser output.
All-fiber pulse laser has the following advantages that：(1) beam quality is high.The core diameter of optical fiber is at several microns
Magnitude, can greatly improve the beam quality of laser, greatly improve measurement range, the range accuracy of laser radar system
With the performance such as resolution ratio.(2) good heat dissipation.The volume very little of optical fiber laser, high power also only needs to air-cooled when operating.(3) body
Product is small.Optical fiber has good flexibility so that laser can be designed to quite compact, compact conformation, be easily integrated, and
Can also be worked in the environment of rather harsh such as HI high impact, strong motion, high-temperature, big dust.(4) good spectral characteristic.Pass through
Change the gain fibre and matched fiber optic component and device of different doping, it is possible to achieve the laser output of different wave length.Cause
This, full-optical-fiber laser is applied to have very big advantage on laser radar.Q adjusting optical fiber laser alternately light source, it is past
Light source width parameter requirement is realized toward the more complicated acousto-optic modulator of Structure of need, and repetition is generally 10-200KHz, pulsewidth is
Few tens of nano-seconds, it is difficult to ensure certainty of measurement higher；MOPA structured optical fibers laser with semiconductor laser as seed source is made
Be alternative light source, due to general seed source power for microwatt magnitude, it is necessary to multi-stage fiber amplifier carries out power to seed light
Amplification can be only achieved light source parameters requirement, and cost is of a relatively high.
Utility model content
In order to solve above-mentioned technical problem present in background technology, the utility model provides a kind of low repetition peak value work(
Rate, compact conformation, the low repetition nanosecond full-optical-fiber laser for laser radar of good heat dissipation effect.
In order to solve the above-mentioned technical problem, the utility model takes following technical scheme.
A kind of low repetition nanosecond full-optical-fiber laser for laser radar, including：Main oscillations level optical fiber seed source system
System and fiber amplifier system, the main oscillations level optical fiber seed origin system, the nanosecond for exporting specific pulsewidth and repetition
Pulse signal, fiber amplifier system device, for will be exported after nanosecond pulse signal amplification.
Main oscillations level optical fiber seed origin system includes：First pumping source resonant cavity, wherein, the resonator is included：The
One wavelength division multiplexer, the first gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber, the first wavelength division multiplexer,
Optics connects to form closed annular chamber successively for first gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber.
First pumping source connects the pumping light input end of the first wavelength division multiplexer, the public output of the first wavelength division multiplexer
Connect one end of the first gain fibre, the other end of the first gain fibre connects the input of photo-coupler, the of photo-coupler
One output end connects the input of laser mode locking device, the second output end connection optical fiber amplification system of photo-coupler, laser lock
The output end of die device connects one end of single-mode transmission optical fiber, and the other end of single-mode transmission optical fiber connects the first wavelength division multiplexer
Signal light input end.
The first pump light that first pumping source is provided is coupled by the first wavelength division multiplexer and transmits to the first gain fibre,
By transmitting the nanosecond arteries and veins that specific pulsewidth and repetition rate are produced to laser mode locking device by photo-coupler after gain amplification
Signal is rushed, the nanosecond pulse signal sequentially passes through single-mode transmission optical fiber, the first wavelength division multiplexer, the first gain fibre, passed through
Cross gain amplify after, a part of nanosecond pulse signal by the second output end output cavity of photo-coupler outside, a part of nanosecond
Pulse signal is exported by the first output end of photo-coupler and continues to vibrate in resonator.
Fiber amplifier system includes：First optoisolator, the second optoisolator, first order optical fiber prime amplifier, second
Level main amplifier and pulse outputting unit, first order optical fiber prime amplifier are included：Second pumping source, the second wavelength division multiplexer and
Second gain fibre, second level main amplifier is included：3rd pumping source, combiner device and the 3rd gain fibre,
Second pumping source connects the pumping light input end of the second wavelength division multiplexer, the flashlight input of the second wavelength division multiplexer
The output end of the first optoisolator of end connection, the input of the first optoisolator connects the second output end of photo-coupler, second
The public output of wavelength division multiplexer connects one end of the second gain fibre, the other end of the second gain fibre connect the second light every
From the input of device, the output end of the second optoisolator connects the signal light input end of combiner device, the 3rd pumping source connection light
The pumping light input end of bundling device, the public output of combiner device connects one end of the 3rd gain fibre, the 3rd gain fibre
The other end connection pulse outputting unit.
The nanosecond pulse signal of the second output end output of photo-coupler passes through in main oscillations level optical fiber seed origin system
Transmitted after first optoisolator to first order optical fiber prime amplifier, the second gain light is coupled into by the second wavelength division multiplexer
Fibre, while the second pump light that the second pumping source is provided is coupled also into the second gain fibre by the second wavelength division multiplexer,
The nanosecond pulse signal and the second pump light produce first laser after amplifying through gain, and then first laser is by the second light
The combiner device entered in the optical fiber main amplifier of the second level after isolator, while the 3rd pump light that the 3rd pumping source is provided also enters
Enter the combiner device in the optical fiber main amplifier of the second level, first laser and the 3rd pump light are coupled generation second laser, then
First laser carries out gain amplification into the 3rd gain fibre, produces high power pulsed laser, eventually passes pulse outputting unit
Output.
Preferably, first gain fibre, the second gain fibre, the 3rd gain fibre are respectively by rare earth doped element
The Active Optical Fiber composition of erbium or ytterbium.
Preferably, the laser mode locking device is CNT saturable absorber.
Preferably, the laser mode locking device is Graphene saturable absorber.
Preferably, the laser mode locking device is semiconductor saturable absorbing mirror and optical fiber circulator, wherein, semiconductor
Saturable absorbing mirror connects the reflection end of optical fiber circulator, the first output of the input connection photo-coupler of optical fiber circulator
End, the output end of optical fiber circulator connects one end of single-mode transmission optical fiber.
Preferably, the pulsewidth of the nanosecond pulse flashlight is 1ns -10ns, the nanosecond pulse flashlight
Repetition is 100KHZ -1MHZ.
Preferably, single-mode transmission optical fiber is single-mode fiber of the zero dispersion point in 1310 ± 10nm.
Preferably, single-mode transmission optical fiber is dispersion compensating fiber, wherein, the dispersion compensating fiber is at 1.5 μm
Positive dispersion.
Preferably, single-mode transmission optical fiber is the single-mode fiber and dispersion compensating fiber group of 1310 ± 10nm by zero dispersion point
Into.
Low repetition nanosecond full-optical-fiber laser for laser radar of the present utility model, including：Main oscillations level optical fiber
Seed origin system and fiber amplifier system, the main oscillations level optical fiber seed origin system, for exporting specific pulsewidth and repetition
Nanosecond pulse signal, the pulsewidth of the nanosecond pulse flashlight is 1ns -10ns, the nanosecond pulse flashlight
Repetition is 100KHZ -1MHZ；Fiber amplifier system device includes first order optical fiber prime amplifier, second level main amplifier, is used for
Exported after the nanosecond pulse signal is amplified by way of two grades of amplifications.The utility model design is simple, compact conformation, no
Need multi-stage fiber amplifier that power amplification is carried out to seed light and can be only achieved light source parameters requirement, while effectively reducing light source
Production cost.
Brief description of the drawings
Fig. 1 is the structural representation of the low repetition nanosecond full-optical-fiber laser for laser radar of the present utility model；
Fig. 2 is the structural representation of the utility model main oscillations level optical fiber seed origin system；
Fig. 3 is shaken using semiconductor saturable absorbing mirror and optical fiber circulator for the utility model as the master of laser mode locking device
Swing the structural representation of grade system；
Fig. 4 is fiber amplifier structural representation of the present utility model.
Wherein, 100. main oscillations level optical fiber seed origin system, 200. fiber amplifier systems, 1. the first pumping source, 2. the
One wavelength division multiplexer, 3. the first gain fibre, 4. photo-coupler, 41. the second output ends of photo-coupler, 5. laser mode locking device,
6. single-mode transmission optical fiber, 7. the first optoisolator, 8. the second optoisolator, 9. the second pumping source, 10. the second wavelength division multiplexer,
11. second gain fibres, 12. the 3rd pumping sources, 13. combiner devices, 14. the 3rd gain fibres, 15. optical fiber circulators, 16. half
Conductor saturable absorbing mirror.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is described further to the utility model, and specific embodiment described herein is only used for explaining the utility model, but does not limit
Determine the utility model.
As shown in figure 1, the utility model embodiment provides a kind of low repetition nanosecond all -fiber for laser radar swashing
Light device, including：Main oscillations level optical fiber seed origin system and fiber amplifier system, the main oscillations level optical fiber seed origin system,
Nanosecond pulse signal for exporting specific pulsewidth and repetition, fiber amplifier system device, for by the nanosecond pulse
Signal is exported after amplifying.
As shown in Fig. 2 main oscillations level optical fiber seed origin system includes：First pumping source resonant cavity, wherein, the resonance
Chamber includes：First wavelength division multiplexer, the first gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber, first wave
Optics connects closing of being formed successively for division multiplexer, the first gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber
Close annular chamber.
First pumping source connects the pumping light input end of the first wavelength division multiplexer, the public output of the first wavelength division multiplexer
Connect one end of the first gain fibre, the other end of the first gain fibre connects the input of photo-coupler, the of photo-coupler
One output end connects the input of laser mode locking device, the second output end connection optical fiber amplification system of photo-coupler, laser lock
The output end of die device connects one end of single-mode transmission optical fiber, and the other end of single-mode transmission optical fiber connects the first wavelength division multiplexer
Signal light input end.
The first pump light that first pumping source is provided is coupled by the first wavelength division multiplexer and transmits to the first gain fibre,
By transmitting the nanosecond arteries and veins that specific pulsewidth and repetition rate are produced to laser mode locking device by photo-coupler after gain amplification
Signal is rushed, the nanosecond pulse signal sequentially passes through single-mode transmission optical fiber, the first wavelength division multiplexer, the first gain fibre, passed through
Cross gain amplify after, a part of nanosecond pulse signal by the second output end output cavity of photo-coupler outside, a part of nanosecond
Pulse signal is exported by the first output end of photo-coupler and continues to vibrate in resonator；There is photo-coupler beam splitting to act on realization
Laser is exported, the nanosecond pulse signal of the first output port output 30% of photo-coupler, the second output end of photo-coupler
The nanosecond pulse signal of mouth output 70%.
As shown in figure 4, fiber amplifier system includes：First optoisolator, the second optoisolator, first order predispersed fiber are put
Big device, second level main amplifier and pulse outputting unit, first order optical fiber prime amplifier are included：Second pumping source, the second ripple
Division multiplexer and the second gain fibre, second level main amplifier are included：3rd pumping source, combiner device and the 3rd gain fibre.
Second pumping source connects the pumping light input end of the second wavelength division multiplexer, the flashlight input of the second wavelength division multiplexer
The output end of the first optoisolator of end connection, the input of the first optoisolator connects the second output end of photo-coupler, second
The public output of wavelength division multiplexer connects one end of the second gain fibre, the other end of the second gain fibre connect the second light every
From the input of device, the output end of the second optoisolator connects the signal light input end of combiner device, the 3rd pumping source connection light
The pumping light input end of bundling device, the public output of combiner device connects one end of the 3rd gain fibre, the 3rd gain fibre
The other end connection pulse outputting unit.
The nanosecond pulse signal of the second output end output of photo-coupler passes through in main oscillations level optical fiber seed origin system
Transmitted after first optoisolator to first order optical fiber prime amplifier, the second gain light is coupled into by the second wavelength division multiplexer
Fibre, while the second pump light that the second pumping source is provided is coupled also into the second gain fibre by the second wavelength division multiplexer,
The nanosecond pulse signal and the second pump light produce first laser after amplifying through gain, and then first laser is by the second light
The combiner device entered in the optical fiber main amplifier of the second level after isolator, while the 3rd pump light that the 3rd pumping source is provided also enters
Enter the combiner device in the optical fiber main amplifier of the second level, first laser and the 3rd pump light are coupled generation second laser, then
First laser carries out gain amplification into the 3rd gain fibre, produces high power pulsed laser, eventually passes pulse outputting unit
Output.
Preferably, first gain fibre, the second gain fibre, the 3rd gain fibre are respectively by rare earth doped element
The Active Optical Fiber composition of erbium or ytterbium.
Preferably, the laser mode locking device is CNT saturable absorber.
Preferably, the laser mode locking device is Graphene saturable absorber.
Preferably, the laser mode locking device is semiconductor saturable absorbing mirror and optical fiber circulator, wherein, such as Fig. 3
Shown, semiconductor saturable absorbing mirror connects the reflection end of optical fiber circulator, the input connection photo-coupler of optical fiber circulator
The first output end, the output end of optical fiber circulator connects one end of single-mode transmission optical fiber.
Preferably, the pulsewidth of the nanosecond pulse flashlight is 1ns -10ns, the nanosecond pulse flashlight
Repetition is 100KHZ -1MHZ.
Preferably, single-mode transmission optical fiber is by meeting ITU-T G.652.D standards and zero dispersion point is in 1310 ± 10nm
Single-mode fiber composition
Preferably, single-mode transmission optical fiber is made up of dispersion compensating fiber (DCF), wherein, the dispersion compensating fiber exists
It is positive dispersion at 1.5 μm.
Preferably, single-mode transmission optical fiber is by meeting ITU-T, and G.652.D standard and zero dispersion point are 1310 ± 10nm's
Single-mode fiber and dispersion compensating fiber (DCF) are constituted.
In ring resonator, the repetition rate f of Mode-locked laser is by formula：F=C/nL is calculated, wherein, C is light
Speed, n is refractive index, and L is that total chamber of resonator is long, and total chamber is long to include the first gain fibre and single-mode transmission optical fiber length,
The cavity length is 200m -1000m, wherein the first gain fibre length is 2m, it is long by changing single-mode transmission optical fiber
Degree, and then the whole resonator of change is long come by changing, chamber is long can to change repetition rate, as a length of 200m-1000m in chamber,
The repetition rate of laser pulse is 100kHZ-1MHZ.It is long by the overall chamber of length increase for extending single-mode transmission optical fiber, effectively drop
The repetition rate of mode locking pulse in low resonator, and realize the narrow spaces output of several nanoseconds.The pulse of transmission in ring resonator
Laser realizes that laser is exported eventually through the beam splitting effect of photo-coupler, because intra-cavity dispersion is by being negative color only after dispersion management
Dissipate, and intracavity pump power has been significantly larger than the threshold pump power for producing traditional orphan, the pulse of generation belongs to noise like
Pulse, resulting power output is 10mw, and pulsewidth is 1-2ns.This example preferably meets ITU-T G.652.D standards and zero
Dispersion point is Transmission Fibers in the single-mode fiber of 1310 ± 10nm, makes the net dispersion value after dispersion management be negative.The present invention may be used also
So that using dispersion compensating fiber (DCF) 16, it is positive dispersion at 1.5 μm, by the dispersion compensating fiber for adding different length
16 can change chamber it is long while, net dispersion value in chamber is changed on the occasion of by other mechanism, such as dissipative solitons, dissipative solitons
Resonance mechanism produces nanosecond pulse.
The utility model design is simple, compact conformation, all-fiber is met, for can effectively reduce light source in laser radar
Production cost and technology difficulty, be with a wide range of applications.
Claims (9)
1. a kind of low repetition nanosecond full-optical-fiber laser for laser radar, it is characterised in that including：Main oscillations level optical fiber
Seed origin system and fiber amplifier system, the main oscillations level optical fiber seed origin system, for exporting specific pulsewidth and repetition
Nanosecond pulse signal, fiber amplifier system device, for will the nanosecond pulse signal amplify after export；
Main oscillations level optical fiber seed origin system includes：First pumping source resonant cavity, wherein, the resonator is included：First wave
Division multiplexer, the first gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber, the first wavelength division multiplexer, first
Optics connects to form closed annular chamber successively for gain fibre, photo-coupler, laser mode locking device, single-mode transmission optical fiber；
First pumping source connects the pumping light input end of the first wavelength division multiplexer, the public output connection of the first wavelength division multiplexer
One end of first gain fibre, the other end of the first gain fibre connects the input of photo-coupler, and the first of photo-coupler is defeated
Go out the input of end connection laser mode locking device, the second output end connection optical fiber amplification system of photo-coupler, laser mode locking dress
The output end put connects one end of single-mode transmission optical fiber, and the other end of single-mode transmission optical fiber connects the signal of the first wavelength division multiplexer
Light input end；
The first pump light that first pumping source is provided is coupled by the first wavelength division multiplexer and transmits to the first gain fibre, passes through
The nanosecond pulse letter that specific pulsewidth and repetition rate are produced to laser mode locking device is transmitted in gain by photo-coupler after amplifying
Number, the nanosecond pulse signal sequentially passes through single-mode transmission optical fiber, the first wavelength division multiplexer, the first gain fibre, by increasing
Benefit amplify after, a part of nanosecond pulse signal by the second output end output cavity of photo-coupler outside, a part of nanosecond pulse
Signal is exported by the first output end of photo-coupler and continues to vibrate in resonator；
Fiber amplifier system includes：First optoisolator, the second optoisolator, first order optical fiber prime amplifier, second level master
Amplifier and pulse outputting unit, first order optical fiber prime amplifier are included：Second pumping source, the second wavelength division multiplexer and second
Gain fibre, second level main amplifier is included：3rd pumping source, combiner device and the 3rd gain fibre；
Second pumping source connects the pumping light input end of the second wavelength division multiplexer, and the signal light input end of the second wavelength division multiplexer connects
The output end of the first optoisolator is connect, the input of the first optoisolator connects the second output end of photo-coupler, the second wavelength-division
The public output of multiplexer connects one end of the second gain fibre, and the other end of the second gain fibre connects the second optoisolator
Input, the output end of the second optoisolator connects the signal light input end of combiner device, the 3rd pumping source connection combiner
The pumping light input end of device, the public output of combiner device connects one end of the 3rd gain fibre, the 3rd gain fibre it is another
One end connects pulse outputting unit；
The nanosecond pulse signal of the second output end output of photo-coupler passes through first in main oscillations level optical fiber seed origin system
Transmitted after optoisolator to first order optical fiber prime amplifier, the second gain fibre be coupled into by the second wavelength division multiplexer,
The second pump light that the second pumping source is provided simultaneously is coupled also into the second gain fibre by the second wavelength division multiplexer, described
Nanosecond pulse signal and the second pump light produce first laser after amplifying through gain, and then first laser is optically isolated by second
The combiner device entered in the optical fiber main amplifier of the second level after device, while the 3rd pump light that the 3rd pumping source is provided is also into the
Combiner device in secondary light fibre main amplifier, first laser and the 3rd pump light be coupled generation second laser, and then first
Laser carries out gain amplification into the 3rd gain fibre, produces high power pulsed laser, eventually passes pulse outputting unit output.
2. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that described
First gain fibre, the second gain fibre, the 3rd gain fibre are made up of the Active Optical Fiber of rare earth doped element erbium or ytterbium respectively.
3. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that described
Laser mode locking device is CNT saturable absorber.
4. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that described
Laser mode locking device is Graphene saturable absorber.
5. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that described
Laser mode locking device be semiconductor saturable absorbing mirror and optical fiber circulator, wherein, semiconductor saturable absorbing mirror connection optical fiber
The reflection end of circulator, the input of optical fiber circulator connects the first output end of photo-coupler, the output end of optical fiber circulator
Connect one end of single-mode transmission optical fiber.
6. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that described
The pulsewidth of nanosecond pulse flashlight is 1ns -10ns, and the repetition of the nanosecond pulse flashlight is 100KHZ -1MHZ.
7. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that single mode
Transmission Fibers are single-mode fiber of the zero dispersion point in 1310 ± 10nm.
8. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that single mode
Transmission Fibers are dispersion compensating fiber, wherein, the dispersion compensating fiber is positive dispersion at 1.5 μm.
9. the low repetition nanosecond full-optical-fiber laser of laser radar is used for as claimed in claim 1, it is characterised in that single mode
Transmission Fibers are by zero dispersion point for the single-mode fiber and dispersion compensating fiber of 1310 ± 10nm are constituted.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106602392A (en) * | 2016-12-20 | 2017-04-26 | 北京工业大学 | Low repetition frequency nanosecond all-fiber laser for laser radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106602392A (en) * | 2016-12-20 | 2017-04-26 | 北京工业大学 | Low repetition frequency nanosecond all-fiber laser for laser radar |
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