CN206412629U - The MOPA optical fiber lasers of adjustable pulse width - Google Patents
The MOPA optical fiber lasers of adjustable pulse width Download PDFInfo
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- CN206412629U CN206412629U CN201720091889.8U CN201720091889U CN206412629U CN 206412629 U CN206412629 U CN 206412629U CN 201720091889 U CN201720091889 U CN 201720091889U CN 206412629 U CN206412629 U CN 206412629U
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Abstract
The utility model discloses a kind of MOPA optical fiber lasers of adjustable pulse width, regulate and control the time delay of two acousto-optic modulators using programmable delay circuit, wherein first sound-optic modulator is used as the switching device of linear impulsive Q adjusting optical fiber laser, Q adjusting optical fiber laser output high-power wide laser pulse；Second sound-optic modulator is realized as photoswitch cuts slicing to output laser pulse, controls the delay time of second sound-optic modulator, can obtain the laser output of adjustable pulse width.Pulsed optical signals so after alliteration optical modulator adjusting pulsewidth effectively amplify through fiber amplifier, obtain high power laser light output, laser pulse width is adjustable, and laser structure is simple.
Description
Technical field
The utility model is related to field of laser device technology, is specifically related to a kind of MOPA optical fiber lasers of adjustable pulse width.
Background technology
High power pulse optical fiber laser, which is mainly, carries out the pulsed optical signals of low-power follow-up luminous power amplification.Light
Fibre laser uses Single-Mode Fiber Coupling semiconductor laser as fiber amplifier seed source, and its output light is used as amplifier
Seed light, laser uses master oscillation power amplification (MOPA) structure to obtain high-peak power and narrow spaces laser pulse.By
The seed luminous power exported in Single-Mode Fiber Coupling semiconductor laser is low, and single pulse energy is small, at least needs two grades or two grades
Above multistage amplification could obtain high-output power；Spontaneous emission light and nonlinear optical are excited simultaneously because existing in amplification light path
Interference, have impact on the efficiency and performance of laser, and seed source is expensive, and production cost is high.
The content of the invention
The problem of existing for current Q-switched laser, the utility model provides a kind of MOPA optical-fiber lasers of adjustable pulse width
Device, is effectively amplified through fiber amplifier, can obtain high power again by the pulsed optical signals after alliteration optical modulator adjusting pulsewidth
Laser is exported, and laser pulse width is adjustable, and laser structure is simple, and production cost is relatively low.
What the technical solution of the utility model was realized in：
A kind of MOPA optical fiber lasers of adjustable pulse width, including for generate seed pulse laser primary oscillator section and
For the fiber amplifier part for by the seed pulse laser export after power amplification, the primary oscillator section includes
Pumping source, optical-fiber bundling device, gain medium, high anti-Fiber Bragg Grating FBG, first sound-optic modulator AOM, the second acousto-optic
Modulator AOM and the low anti-Fiber Bragg Grating FBG between first sound-optic modulator AOM and second sound-optic modulator AOM；
The fiber amplifier part is to pass through optical fiber between first stage amplifier or casacade multi-amplifier, the adjacent amplifier of casacade multi-amplifier
Isolator is connected, and outermost first stage amplifier connects a fibre optic isolater；Every grade of amplifier includes amplifier pumping source group, amplification
Device optical-fiber bundling device and amplifier laser gain media；Also include control circuit part, the control circuit part includes connection
Pumping source simultaneously drives the luminous pumping source driving circuit of pumping source, modulation first sound-optic modulator AOM open and-shut mode and switch
The second of the first sound-optic modulator drive circuit of frequency, modulation second sound-optic modulator AOM open and-shut mode and switching frequency
Acousto-optic modulator drive circuit, respectively control first sound-optic modulator drive circuit and second sound-optic modulator drive circuit, from
And modulate the delay circuit of time delay between first sound-optic modulator and second sound-optic modulator, connection amplifier pumping source
Group and the luminous amplifier pumping source driving circuit of driving amplifier pumping source group, control respectively the pumping source driving circuit,
The control circuit of delay circuit and amplifier pumping source driving circuit.
Further, the pump mode of the MOPA optical fiber lasers of the adjustable pulse width be forward pumping, backward pumping or
Two directional pump, when two directional pump works, gain medium two ends pumping source is with identical mode of operation or different works
Operation mode works, and the pumping source at gain medium two ends pumping doped fiber or has the pumping doped fiber of delay simultaneously.
Further, the pumping source is operated in continuous mode or pulse mode.
Further, connected between the fiber amplifier part and the primary oscillator section by fibre optic isolater,
Or the low anti-Fiber Bragg Grating FBG of the primary oscillator section is connected with second sound-optic modulator AOM by fibre optic isolater
Connect.
Further, the gain medium is single-mode fiber, doubly clad optical fiber or LMA photonic crystal fibers.
Further, the gain medium is Yb doped fibers, Er doped fibers, Yb/Er co-doped fibers, Tm doping
Optical fiber and Nd doped fibers.
Further, the bundling device is side pump-type bundling device, end pump-type bundling device or wavelength division multiplexer WDM.
Further, the wave-length coverage of the pumping source is 808nm, 915nm, 940nm, 980nm or other doped fibers
The absorbing wavelength of middle active ions.
Further, regulating and controlling second sound-optic modulator by delay circuit drives time delay to be 1-500ns.
The beneficial effects of the utility model are：Foundation structure of the utility model based on linear cavity fiber laser, is used
Alliteration optical modulator realizes a kind of MOPA optical fiber lasers of adjustable pulse width, and two acousto-optic modulators are regulated and controled using delay circuit
Time delay, wherein first sound-optic modulator be used as linear impulsive Q adjusting optical fiber laser switching device, adjust Q optical-fiber lasers
Device output high-power wide laser pulse；Second sound-optic modulator is realized as photoswitch cuts slicing, control to output laser pulse
The delay time of second sound-optic modulator processed, can obtain the laser output of adjustable pulse width.So by the regulation of alliteration optical modulator
Pulsed optical signals after pulsewidth effectively amplify through fiber amplifier again, can obtain high power laser light output, and laser pulse width is adjustable,
Laser structure is simple, and production cost is relatively low.It is preferred that, second sound-optic modulator is introduced, the rising tone is regulated and controled by delay circuit
Optical modulator drives time delay 1-500ns, and most high delay time includes but is not limited to 500ns；Second sound-optic modulator is to humorous
The pulse laser that the chamber that shakes is produced carries out slicing, and pulsewidth narrows, 1~500ns of pulse width, including but not limited to 500ns.Obtain
Turnable pulse width laser is effectively amplified after fibre optic isolater by fiber amplifier, eventually passes fibre optic isolater output.
Brief description of the drawings
Fig. 1 is the structural representation of the MOPA optical fiber lasers of the adjustable pulse width of the utility model embodiment 1；
Fig. 2 is the structural representation of the MOPA optical fiber lasers of the adjustable pulse width of the utility model embodiment 2；
Fig. 3 is the structural representation of the MOPA optical fiber lasers of the adjustable pulse width of the utility model embodiment 3.
Embodiment
In order to be more clearly understood that technology contents of the present utility model, described in detail especially exemplified by following examples, its mesh
Be only that and be best understood from content of the present utility model and unrestricted protection domain of the present utility model.
Embodiment 1
The structural representation of embodiment 1 as shown in figure 1, a kind of MOPA optical fiber lasers 100 of adjustable pulse width, including for
Generate the primary oscillator section of seed pulse laser and the light for exported after power amplification the seed pulse laser
Fiber amplifier part, it is reflective that the primary oscillator section includes pumping source 12, optical-fiber bundling device 13, gain medium 14, height
Fine Bragg grating 15, first sound-optic modulator AOM 18, second sound-optic modulator AOM 21 and positioned at first sound-optic modulator
Low anti-Fiber Bragg Grating FBG 19 between AOM and second sound-optic modulator AOM；Put for one-level the fiber amplifier part 24
Connected between big device or casacade multi-amplifier, the adjacent amplifier of casacade multi-amplifier by fibre optic isolater, and outermost one-level is amplified
Device connects a fibre optic isolater；Every grade of amplifier includes amplifier pumping source group 241, amplifier optical fiber bundling device 242 and amplification
Device gain medium 243；Also include control circuit part, the control circuit part includes connection pumping source and drives pumping
First acousto-optic of the luminous pumping source driving circuit 11 in source, modulation first sound-optic modulator AOM open and-shut mode and switching frequency
The second sound-optic modulator of modulator driver circuit 17, modulation second sound-optic modulator AOM open and-shut mode and switching frequency drives
Dynamic circuit 20, respectively control first sound-optic modulator drive circuit and second sound-optic modulator drive circuit, so as to modulate first
The delay circuit 16 of time delay between acousto-optic modulator and second sound-optic modulator, connection amplifier pumping source group simultaneously drive
The luminous amplifier pumping source driving circuit 23 of amplifier pumping source group, the pumping source driving circuit, deferred telegram are controlled respectively
Road and the control circuit 10 of amplifier pumping source driving circuit.So, prolonging using delay circuit two acousto-optic modulators of regulation and control
Slow time, wherein first sound-optic modulator, Q adjusting optical fiber laser was defeated as the switching device of linear impulsive Q adjusting optical fiber laser
Go out high power wide laser pulse；Second sound-optic modulator is realized as photoswitch cuts slicing, control the to output laser pulse
Two acousto-optic modulators can obtain adjustable pulse width relative to the delay time of Q adjusting optical fiber laser master oscillator output laser pulse
Laser output.Pulsed optical signals so after alliteration optical modulator adjusting pulsewidth effectively amplify through fiber amplifier again,
High power laser light output can be obtained, and laser pulse width is adjustable, laser structure is simple, and production cost is relatively low.
It is preferred that, connected between the fiber amplifier part and the primary oscillator section by fibre optic isolater, or
The low anti-Fiber Bragg Grating FBG of primary oscillator section described in person is connected with second sound-optic modulator AOM by fibre optic isolater.
It is preferred that, delay circuit is programmable delay circuit, so, and pulse width can accurately be controlled by program.
The working method of the MOPA optical fiber lasers of adjustable pulse width described in embodiment 1 is：
Pumping source is a kind of fiber coupled laser diode, is that gain medium (doped fiber) provides energy.Control
Circuit processed controls pumping source driving circuit, delay circuit and amplifier pumping source driving circuit respectively.Pumping source driving circuit
Pumping source is connected, driving pumping source lights；Delay circuit is entered the TTL signal for controlling circuit to send at line delay by chip
Reason, sends two TTL signals with delay, controls first sound-optic modulator drive circuit and second sound-optic modulator to drive respectively
Dynamic circuit, so as to modulate the time delay between first sound-optic modulator and second sound-optic modulator；First, second acousto-optic modulation
Device drive circuit modulates the open and-shut mode and switching frequency of respective acousto-optic modulator AOM (Q-switch).High anti-optical fiber Bragg light
Grid have characteristic thoroughly, anti-to flashlight height high to pump light.High anti-Fiber Bragg Grating FBG, gain medium (doping light
It is fine), optical-fiber bundling device, first sound-optic modulator and low anti-Fiber Bragg Grating FBG collectively form linear Q adjusting optical fiber laser
Optical resonator.The active ions that the light that pumping source is sent is adulterated after doped fiber in optical fiber absorb, and form particle
Number reversion.When Q-switch is closed, the oscillation threshold of laser is very high, and laser generation can not be produced in resonator；Work as Q-switch
During opening, laser generation is set up rapidly, and the laser of generation is exported by output grating (low anti-Fiber Bragg Grating FBG).Export laser
Pulse width it is relevant with the loss of the length of resonator, acoustooptic switch and resonator.In theory by changing linear resonant cavity
Length export structure pulse width can be more than the Millisecond, but pulse width within 500ns is sufficient for actual work
Industry application requirement.The relative first acousto-optic driver delay 1- of second sound-optic modulator driving is adjusted by regulating and controlling delay circuit
500ns, the laser pulse of the output clipped wave after second sound-optic modulator, the pulse width of output narrows.Obtained narrow arteries and veins
Wide laser is effectively amplified after fibre optic isolater by follow-up fiber amplifier, and the pulse laser of amplification is defeated through fibre optic isolater
Go out.Fibre optic isolater can effectively prevent the influence of reflected light, the time delay that modulation second sound-optic modulator is opened, can obtain
To the laser pulse of distinct pulse widths, pulse width can accurately be controlled by program.
Embodiment 2
The structural representation of embodiment 2 is as shown in Fig. 2 a kind of MOPA optical fiber lasers 200 of adjustable pulse width, including control are electric
Road 10, the first pumping source driving circuit 11, the first pumping source 12, the first optical-fiber bundling device 13, the second pumping source driving circuit 26,
Second pumping source 27, the second optical-fiber bundling device 28, gain medium 14, high anti-Fiber Bragg Grating FBG 15, delay circuit 16,
First sound-optic modulator drive circuit 17, first sound-optic modulator AOM 18, low anti-Fiber Bragg Grating FBG 19, the second acousto-optic are adjusted
Device drive circuit 20 processed, second sound-optic modulator AOM 21, fibre optic isolater 22, device pumping source driving circuit 23, fiber amplifier
Device part 24, wherein 241 be amplifier pumping source group, 242 be amplifier optical fiber bundling device, and 243 be that amplifier laser gain is situated between
Matter, fibre optic isolater 25.
As different from Example 1, embodiment 2 uses two directional pump mode, and pumping source can be operated in the progressive die
Under formula, it can also work in the pulsing mode；Two ends pumping source can be with identical mode of operation, can also be with different
Mode of operation；Two ends pumping source can be while pumping doped fiber, it is possibility to have the pumping doped fiber of delay.At other
It can also be backward pumping in embodiment.
Embodiment 3
The structural representation of embodiment 3 is as shown in figure 3, a kind of MOPA optical fiber lasers 300 of adjustable pulse width, including control
Circuit 10, pumping source driving circuit 11, pumping source 12, optical-fiber bundling device 13, gain medium 14, high anti-optical fiber Bragg light
Grid 15, delay circuit 16, first sound-optic modulator drive circuit 17, first sound-optic modulator AOM 18, low anti-optical fiber Bragg
Grating 19, second sound-optic modulator drive circuit 20, second sound-optic modulator AOM 21, fibre optic isolater 22, first stage amplifier
Pumping source driving circuit 23, two-stage amplifier pumping source driving circuit 29, fiber amplifier 24, wherein 241 are amplifier pumpings
Source group, 242 be amplifier optical fiber bundling device, and 243 be amplifier laser gain media (doped fiber), fibre optic isolater 25.
As different from Example 1, the fiber amplifier of case study on implementation 3 is amplified using two-stage, can also be put using multistage
Connected between big mode, each amplifying stage by fibre optic isolater.Multistage amplification be conducive to obtaining high s/n ratio pulse signal and
Higher laser power output.
In the various embodiments described above, the wave-length coverage of pumping source can for 808nm, 915nm, 940nm, 980nm etc. or other
The absorbing wavelength of active ions in doped fiber.
In the various embodiments described above, gain medium can be Yb doped fibers, Er doped fibers, Yb, Er co-doped fiber,
Tm doped fibers, rare earth doped single-mode fiber, doubly clad optical fiber or the LMA photonic crystal fibers such as Nd doped fibers.
In the various embodiments described above, pumping source can work in a continuous mode, can also work in the pulsing mode.
In the various embodiments described above, optical-fiber bundling device can be side pump-type (1+1) × 1, the grade bundling device of (2+1) × 1, can also
For end pump-type (3+1) × 1, (6+1) × 1, the grade bundling device of (18+1) × 1, or wavelength division multiplexer WDM.
In the various embodiments described above, second sound-optic modulator is introduced, the second acousto-optic modulation is regulated and controled by programmable delay circuit
Device drives time delay 1-500ns, and most high delay time includes but is not limited to 500ns；Second sound-optic modulator is produced to resonator
Raw pulse laser carries out slicing, and pulsewidth narrows, 1~500ns of pulse width, including but not limited to 500ns.Obtained adjustable arteries and veins
Wide laser is effectively amplified after fibre optic isolater by fiber amplifier, eventually passes fibre optic isolater output.
To sum up, foundation structure of the utility model based on linear cavity fiber laser, is realized using alliteration optical modulator
The MOPA optical fiber lasers of a kind of adjustable pulse width, when regulating and controlling the delay of two acousto-optic modulators using programmable delay circuit
Between, wherein first sound-optic modulator is used as the switching device of linear impulsive Q adjusting optical fiber laser, Q adjusting optical fiber laser output height
Power wide laser pulse；Second sound-optic modulator is realized as photoswitch cuts slicing to output laser pulse, controls the rising tone
The delay time of optical modulator, can obtain the laser output of adjustable pulse width.So after alliteration optical modulator adjusting pulsewidth
Pulsed optical signals effectively amplify through fiber amplifier, obtain high power laser light output, laser pulse width is adjustable, laser structure letter
It is single.
Above example is that referring to the drawings, preferred embodiment of the present utility model is described in detail.The skill of this area
Art personnel are by carrying out modification or change on various forms to above-described embodiment, but without departing substantially from substantive feelings of the present utility model
Under condition, all fall within protection domain of the present utility model.
Claims (9)
1. a kind of MOPA optical fiber lasers of adjustable pulse width, it is characterised in that：Shaken including the master for generating seed pulse laser
Swing device part and the fiber amplifier part for exported after power amplification the seed pulse laser, the main oscillations
Device part includes pumping source, optical-fiber bundling device, gain medium, high anti-Fiber Bragg Grating FBG, first sound-optic modulator
AOM, second sound-optic modulator AOM and the low reflective fibre between first sound-optic modulator AOM and second sound-optic modulator AOM
Bragg grating；The fiber amplifier part is first stage amplifier or casacade multi-amplifier, the adjacent amplifier of casacade multi-amplifier
Between connected by fibre optic isolater, and outermost first stage amplifier connect a fibre optic isolater；Every grade of amplifier includes amplifier
Pumping source group, amplifier optical fiber bundling device and amplifier laser gain media；Also include control circuit part, the control circuit
Part includes connection pumping source and drives the luminous pumping source driving circuit of pumping source, modulates opening for first sound-optic modulator AOM
The first sound-optic modulator drive circuit of closed state and switching frequency, modulation second sound-optic modulator AOM open and-shut mode and open
Close the second sound-optic modulator drive circuit of frequency, control first sound-optic modulator drive circuit and second sound-optic modulator respectively
Drive circuit, so as to modulate the delay circuit of the time delay between first sound-optic modulator and second sound-optic modulator, connection
The luminous amplifier pumping source driving circuit of amplifier pumping source group and driving amplifier pumping source group, the pumping is controlled respectively
The control circuit of source driving circuit, delay circuit and amplifier pumping source driving circuit.
2. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The MOPA of the adjustable pulse width
The pump mode of optical fiber laser is forward pumping, backward pumping or two directional pump, when two directional pump works, and laser gain is situated between
Matter two ends pumping source is with identical mode of operation or different mode of operation, the pumping source at gain medium two ends
Pumping doped fiber or there is the pumping doped fiber of delay simultaneously.
3. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The pumping source is operated in
Continuous mode or pulse mode.
4. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The fiber amplifier portion
Point be connected between the primary oscillator section by fibre optic isolater, or the primary oscillator section low reflective fine Bradley
Lattice grating is connected with second sound-optic modulator AOM by fibre optic isolater.
5. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The gain medium
For single-mode fiber, doubly clad optical fiber or LMA photonic crystal fibers.
6. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The gain medium
For Yb doped fibers, Er doped fibers, Yb/Er co-doped fibers, Tm doped fibers and Nd doped fibers.
7. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The bundling device is side pump
Type bundling device, end pump-type bundling device or wavelength division multiplexer WDM.
8. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：The wavelength of the pumping source
Scope is the absorbing wavelength of active ions in 808nm, 915nm, 940nm, 980nm or other doped fibers.
9. the MOPA optical fiber lasers of adjustable pulse width according to claim 1, it is characterised in that：Regulated and controled by delay circuit
Second sound-optic modulator driving time delay is 1-500ns.
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| CN201720091889.8U CN206412629U (en) | 2017-01-22 | 2017-01-22 | The MOPA optical fiber lasers of adjustable pulse width |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785875A (en) * | 2017-01-22 | 2017-05-31 | 昆山华辰光电科技有限公司 | The MOPA optical fiber lasers of adjustable pulse width |
| CN108963744A (en) * | 2018-08-29 | 2018-12-07 | 中国人民解放军空军工程大学 | A kind of variable impulse width high energy nanosecoud pulse laser for the detection of laser blast wave binding force |
| CN111952830A (en) * | 2020-07-21 | 2020-11-17 | 大族激光科技产业集团股份有限公司 | Nanosecond seed source and double-pulse-width optical fiber laser |
-
2017
- 2017-01-22 CN CN201720091889.8U patent/CN206412629U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785875A (en) * | 2017-01-22 | 2017-05-31 | 昆山华辰光电科技有限公司 | The MOPA optical fiber lasers of adjustable pulse width |
| CN108963744A (en) * | 2018-08-29 | 2018-12-07 | 中国人民解放军空军工程大学 | A kind of variable impulse width high energy nanosecoud pulse laser for the detection of laser blast wave binding force |
| CN111952830A (en) * | 2020-07-21 | 2020-11-17 | 大族激光科技产业集团股份有限公司 | Nanosecond seed source and double-pulse-width optical fiber laser |
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