CN208767607U - A kind of dual wavelength lock-out pulse optical fiber laser - Google Patents
A kind of dual wavelength lock-out pulse optical fiber laser Download PDFInfo
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- CN208767607U CN208767607U CN201821516147.6U CN201821516147U CN208767607U CN 208767607 U CN208767607 U CN 208767607U CN 201821516147 U CN201821516147 U CN 201821516147U CN 208767607 U CN208767607 U CN 208767607U
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Abstract
The utility model discloses a kind of dual wavelength lock-out pulse optical fiber laser, and laser diode, bundling device, gain fibre, first collimator, the second collimator constitute the fiber section of laser；Free space portion between first collimator and the second collimator is disposed with the first Polarization Controller, polarization beam apparatus, birefringent filter, polarization-dependent isolator and the second Polarization Controller from the second collimator to first collimator direction；Output port of the reflected light of polarization beam apparatus as laser, the asynchronous mode locking pulse of output dual wavelength；First grating and the second parallel gratings are placed, and composition grating carries out dispersion compensation to the asynchronous mode locking pulse of the dual wavelength exported and obtain the pulse of dual wavelength synchronizing mode-licked to being set at the output port of laser.
Description
Technical field
The utility model relates to optical fiber laser fields, and in particular to a kind of optical fiber of exportable dual wavelength lock-out pulse is sharp
Light device.
Background technique
Dual wavelength lock-out pulse laser is in terms of nonlinear frequency conversion, ultra broadband light source and THz wave
There is important application.Mode-locking technique is to obtain the common method of ultrashort light pulse.The core devices for realizing passive mode-locking are saturables
Absorber, the equivalent saturable absorber constituted including the use of fiber nonlinear effect and the saturable absorption characteristic using material
The true saturable absorber of production.Its working principle is that the loss of saturable absorber subtracts with the increase of incident intensity
Small, edge of a pulse partial intensities are small, and loss is big, and pulse center partial intensities are big, and loss is small, and therefore, pulse passes through saturable
It is narrowed when absorber.
Compared to solid lock-out pulse laser, optical fiber lock-out pulse laser has compact-sized, good heat dissipation effect, turns
The advantages that changing high-efficient and good beam quality.At present in optical fiber laser, the method for realizing double-wavelength pulse output is general
It is that two resonant cavities share a saturable absorber, or use two kinds of gain fibres in a resonant cavity, obtains simultaneously
The pulse of 1.0 μm and 1.5 mu m wavebands.Structure is complicated for this mode, and when being transmitted in a fiber due to the pulse of different wave length
Speed is different, is difficult so that two pulses are fully synchronized.
Utility model content
To solve the above problems, the utility model provides a kind of dual wavelength lock-out pulse optical fiber laser, can generate double
Wavelength sync pulse output.
The technical solution of the utility model is: a kind of dual wavelength lock-out pulse optical fiber laser, comprising: laser diode
(2), bundling device (3), gain fibre (4), first collimator (1), the second collimator (5), the first grating (11), the second grating
(12), right-angle prism (13)；
Laser diode (2) is connect with bundling device (3), and bundling device (3) connects first collimator (1), another way warp all the way
Gain fibre (4) connects the second collimator (5)；Laser diode (2), bundling device (3), gain fibre (4), first collimator
(1), the second collimator (5) constitutes the fiber section of laser；
Free space portion between first collimator (1) and the second collimator (5), from the second collimator (5) to first
It is related that collimator (1) direction is disposed with the first Polarization Controller (6), polarization beam apparatus (7), birefringent filter, polarization
Isolator (9) and the second Polarization Controller (10)；
The fiber section and free space portion of laser collectively form annular chamber；
Output port of the reflected light of polarization beam apparatus (7) as laser, the asynchronous mode locking pulse of output dual wavelength；
First grating (11) and the second grating (12) are placed in parallel composition grating pair, and right-angle prism (13) is by the defeated of grating pair
Light is reverse back to grating pair out；Grating is to being set at the output port of laser, to the asynchronous mode locking arteries and veins of the dual wavelength exported
It rushes in row dispersion compensation and obtains the pulse of dual wavelength synchronizing mode-licked.
Laser diode (2) is connect with bundling device (3).
Further, birefringent filter (8) is made of birefringece crystal.
Further, gain fibre (4) is Yb dosed optical fiber.
Further, the first Polarization Controller (6) includes half wave plate (6-1) and the first quarter-wave plate (6-
2)；Half wave plate (6-1) is located at close to the side of the second collimator (5), and the first quarter-wave plate (6-2) is located at close
The side of first collimator (1).
Further, the second Polarization Controller (10) is the second quarter-wave plate (10-1).
Further, the second Polarization Controller (10) includes a half wave plate and a quarter-wave plate.
Further, the first grating (11), the second grating (12) are reflecting grating.
Further, the first grating (11), the second grating (12) are transmission grating.
Dual wavelength lock-out pulse optical fiber laser provided by the utility model, laser annular chamber output dual wavelength are asynchronous
Pulse passes through the pulse spacing of changeable double-wavelength pulse to dispersion compensation, grating is carried out by grating after pulse output
Optimize the spacing between grating pair, may make asynchronous impulses to be converted into lock-out pulse, realize that the pulse of two wavelength is completely same
Step.This optical fiber laser is additionally provided with birefringent filter, rotating birefringence penetrate optical filter, it can be achieved that different central wavelengths double wave
Long lock-out pulse output.
Detailed description of the invention
Fig. 1 is the utility model principle schematic diagram.
Fig. 2 is one specific implementation structural schematic diagram of the utility model.
Fig. 3 is one specific implementation of the utility model, optical output schematic diagram when grating is to using reflecting grating.
Fig. 4 is the spectrogram for the double-wavelength pulse that the utility model specific implementation numerical simulation obtains.
Fig. 5 is the two of two wavelength of the polarization beam apparatus output that the utility model specific implementation numerical simulation obtains
A pulse.
It is same to the dual wavelength after dispersion compensation through grating that Fig. 6 is that the utility model specific implementation numerical simulation is obtained
Pace pulse.
In figure, 1- first collimator, 2- laser diode, 3- bundling device, 4- gain fibre, the second collimator of 5-, 6-
One Polarization Controller, 7- polarization beam apparatus, 8- birefringent filter, 9- polarization-dependent isolator, the second Polarization Controller of 10-,
The first grating of 11-, the second grating of 12-, 13- right-angle prism, 6-1- half wave plate, the first quarter-wave plate of 6-2-, 10-
The second quarter-wave plate of 1-.
Specific embodiment
The utility model is elaborated with reference to the accompanying drawing and by specific embodiment, and following embodiment is to this
The explanation of utility model, and the utility model is not limited to following implementation.
As shown in Figure 1, dual wavelength lock-out pulse optical fiber laser provided by the utility model, comprising: laser diode 2,
It is bundling device 3, gain fibre 4, first collimator 1, the second collimator 5, the first Polarization Controller 6, polarization beam apparatus 7, birefringent
Optical filter 8, polarization-dependent isolator 9, the second Polarization Controller 10, the first grating 11, the second grating 12.
Laser diode 2 is connect with bundling device 3.First collimator 1, bundling device 3, gain fibre 4 and the second collimator
5 are linked in sequence the fiber section for constituting laser.Laser diode 2 is optical-fiber coupling semiconductor laser diode, output
Pump light enters gain fibre 4 by bundling device 3, passes through energy level transition 1.0 mu m wavebands of generation after the absorption pump light of gain fibre 4
Laser.Wherein gain fibre 4 uses Yb dosed optical fiber.
First Polarization Controller 6, polarization beam apparatus 7, birefringent filter 8, polarization-dependent isolator 9 and the second polarization control
Device 10 processed is placed sequentially in the free space portion of first collimator 1 and the second collimator 5 in order, wherein the first polarization control
Device 6 processed is close to 5 one end of the second collimator, and the second Polarization Controller 10 is close to 1 one end of first collimator.
The fiber section and free space portion of laser collectively form annular chamber, and laser is collimated in annular chamber, polarized
After the processing such as adjustment, stabilized lasers are exported through the reflecting surface of polarization beam apparatus 7.
Second collimator 5 is used to be directional light by the laser alignment of optical fiber output, and first collimator 1 is used for parallel optocoupler
It is bonded to optical fiber.
First Polarization Controller 6 and the second Polarization Controller 10, for adjusting the polarization state of laser pulse.
In annular chamber, the first Polarization Controller 6, polarization-dependent isolator 9 and the second Polarization Controller 10 are collectively formed
Nonlinear polarization rotation module.Polarization beam apparatus 7, birefringent filter 8 and polarization-dependent isolator 9 collectively form filtering mould
Block.Rotating birefringence penetrates optical filter 8, and the centre frequency of dual wavelength can be changed.Wherein birefringent filter 8 uses quartz-crystal system
At.
Output port of the reflected light of polarization beam apparatus 7 as laser, the asynchronous mode locking pulse of output dual wavelength.First
Grating 11 and the second grating 12 are placed in parallel composition grating pair, and the output light of grating pair is reverse back to grating by right-angle prism (13)
It is right.Grating carries out dispersion compensation to being set at the output port of laser, to the asynchronous mode locking pulse of the dual wavelength exported,
By adjusting the spacing between grating pair, thus it is possible to vary the spacing between two pulses may make when grating is suitable to spacing
The pulse of two wavelength is completely coincident, and asynchronous mode locking pulse is converted into synchronizing mode-licked pulse, final to obtain dual wavelength synchrolock
Mould pulse.
The specific working principle is as follows for the utility model dual wavelength lock-out pulse optical fiber laser:
Ultrashort pulse is obtained by the equivalent saturable absorption effect of nonlinear polarization rotation.Pulsed light passes through polarization beam splitting
Linearly polarized light is converted to after device 7, linearly polarized light is converted elliptically polarized light by the second subsequent polarization control module.Pulse is in light
When transmitting in fibre, the nonlinear effect of optical fiber is acted in two orthogonal polarization components, and the polarization state of pulse is made to change.By
It is that intensity is relevant in nonlinear phase shift, polarization state is no longer consistent along entire pulse.The first polarization control module is adjusted, so that arteries and veins
When punching is again by polarization-dependent isolator 9, the biggish central part of pulse strength is penetrated, and the lower marginal portion of intensity
It is most of to be reflected, to play the role of shaping pulse.
Due to the nonlinear interaction of optical fiber and the adjustment effect of polarization control module, quilt when polarization beam apparatus 7 is passed through in pulse
Shaping, central part transmitance is strong, and marginal portion transmitance is weak, and the output of polarization beam apparatus 7 practical to the reflected light outside chamber is arteries and veins
Rush the part filtered out when shaping.Also, the working condition of characteristic and laser that polarization beam apparatus 7 exports has much relations.
When nonlinear polarization rotation is stronger, pulse center part approximation nondestructively passes through polarization beam apparatus 7, the front and rear side of pulse
Edge point is reflected, at this point, the pulse outside 7 output cavity of polarization beam apparatus is divided into two pulses.
In optical fiber laser, intracavitary net dispersion is different, and pulse has different mechanism of Evolution.When optical fiber laser is intracavitary net
Dispersion is timing, and the comprehensive function of intracavitary non-linear, dispersion, gain and optical filter loss generates dissipative solitons.Dissipative solitons
For linear-chirped-pulse, the spectrum component different along correspondence before and after pulse.Therefore, when laser works are in dissipative solitons state,
And the pulse outside 7 output cavity of polarization beam apparatus, when being divided into two pulses, the spectrum of pulse is divided into two parts simultaneously, becomes corresponding
The Dual-wavelength of different center frequency.
Two pulses of the dual wavelength that polarization beam apparatus 7 exports are asynchronous in time.But since two pulses are close at this time
Like linear chrip, dispersion compensation can be carried out to pulse in space by grating, so that two pulses of two wavelength are in the time
On be completely coincident, to obtain dual wavelength lock-out pulse.
In order to more clearly state the technology contents of the utility model, the present embodiment is provided with next concrete implementation side
Formula.
As shown in Fig. 2, the optical fiber laser include: first collimator 1, laser diode 2, bundling device 3, gain fibre 4,
Second collimator 5, half wave plate 6-1, the first quarter-wave plate 6-2, polarization beam apparatus 7, birefringent filter 8, partially
Shake dependent isolator 9, the second quarter-wave plate 10-1, the first grating 11, the second grating 12 and right-angle prism 13.
First collimator 1, bundling device 3, gain fibre 4 and the second collimator 5 are linked in sequence, and form the optical fiber of laser
Part.Half wave plate 6-1, the first quarter-wave plate 6-2, polarization beam apparatus 7, birefringent filter 8, polarization it is related every
The free space portion between two collimators is successively placed in order from device 9 and the second quarter-wave plate 10-1, two points
One of wave plate 6-1 be located at close to the position of the second collimator 5, the second quarter-wave plate 10-1 is located at close to first collimator 1
Position.The fiber section and free space portion of laser collectively form annular chamber.
Laser diode 2 is optical-fiber coupling semiconductor laser diode 2, the 976nm pump light of output by bundling device 3 into
Enter 2m and mix ytterbium gain fibre 4, generates the laser of 1.0 mu m wavebands after the absorption pump light of gain fibre 4 by energy level transition.
Second collimator 5 is used to be directional light by the laser alignment of optical fiber output, and first collimator 1 is used for parallel optocoupler
It is bonded to optical fiber.
First quarter-wave plate 6-2 and half wave plate 6-1 forms the first Polarization Controller 6, the second a quarter
Wave plate 10-1 is the second Polarization Controller 10.First Polarization Controller 6 and the second Polarization Controller 10, for adjusting laser
The polarization state of pulse.It should be noted that the second polarizer 10 also may include a half wave plate and one four/
One wave plate.
Half wave plate 6-1, the first quarter-wave plate 6-2, polarization-dependent isolator 9 and the second quarter-wave
Piece 10-1 collectively forms nonlinear polarization rotation module.Polarization beam apparatus 7, birefringent filter 8 and polarization-dependent isolator 9
Collectively form filter module.
Output port of the reflected light of polarization beam apparatus 7 as laser, the asynchronous mode locking pulse of output dual wavelength.First
Grating 11, the second grating 12 are used to carry out dispersion compensation to two pulses of dual wavelength, between adjusting between the pulse of two wavelength
Away from.
First grating 11, the second grating 12 are used to carry out dispersion compensation to two pulses of dual wavelength, adjust two wavelength
Spacing between pulse.
Transmission grating or reflecting grating can be used in first grating 11 and the second grating 12.
When the first grating 11 and the second grating 12 are using transmission grating, the illumination of laser output is mapped to the first grating 11
It was directional light when upper, after the first grating 11 and the transmission of the second grating 12, hot spot is expanded, and right-angle prism 13 is by the second grating
12 transmitted light is reverse back to the second grating 12, and light beam is again through grating pair, the original size of hot spot boil down to, and grating is to mentioning
The dispersion values of confession double.
As shown in figure 3, the light of laser output is through first when the first grating 11 and the second grating 12 are using reflecting grating
After grating 11,12 roundtrip of the second grating, the reflected light of the second grating 12 is reverse back to the second grating 12 by right-angle prism 13.
Fig. 4 show the spectrogram for the double-wavelength pulse that this specific implementation numerical simulation obtains.Central wavelength difference
For 1051.42nm and 1067.9nm, three dB bandwidth is 1.06nm.
The dual wavelength that Fig. 5 is shown outside 7 output cavity of polarization beam apparatus that this specific implementation numerical simulation obtains is non-same
Pace pulse.The width of two pulses is 6.86ps, pulse spacing 16.4ps.
It is -0.62ps to the dispersion values of offer that Fig. 6, which show the transmission grating that this specific implementation numerical simulation obtains,2
The dipulse of Shi Chonghe.Coincidence afterpulse width is 170fs.
The above is only the preferred embodiment of the utility model, it should be pointed out that: for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (8)
1. a kind of dual wavelength lock-out pulse optical fiber laser characterized by comprising laser diode (2), increases bundling device (3)
Beneficial optical fiber (4), first collimator (1), the second collimator (5), the first grating (11), the second grating (12), right-angle prism (13)；
Laser diode (2) is connect with bundling device (3), and bundling device (3) connects first collimator (1), another way through gain all the way
Optical fiber (4) connects the second collimator (5)；Laser diode (2), bundling device (3), gain fibre (4), first collimator (1),
The fiber section of two collimators (5) composition laser；
Free space portion between first collimator (1) and the second collimator (5), from the second collimator (5) to the first collimation
Device (1) direction is disposed with the related isolation of the first Polarization Controller (6), polarization beam apparatus (7), birefringent filter, polarization
Device (9) and the second Polarization Controller (10)；
The fiber section and free space portion of laser collectively form annular chamber；
Output port of the reflected light of polarization beam apparatus (7) as laser, the asynchronous mode locking pulse of output dual wavelength；
First grating (11) and the second grating (12) are placed in parallel composition grating pair, and right-angle prism (13) is by the output light of grating pair
It is reverse back to grating pair；Grating to being set at the output port of laser, to the asynchronous mode locking pulse of the dual wavelength exported into
Row dispersion compensation obtains the pulse of dual wavelength synchronizing mode-licked.
2. dual wavelength lock-out pulse optical fiber laser according to claim 1, which is characterized in that birefringent filter (8)
It is made of birefringece crystal.
3. dual wavelength lock-out pulse optical fiber laser according to claim 1, which is characterized in that gain fibre (4) is to mix
Ytterbium optical fiber.
4. dual wavelength lock-out pulse optical fiber laser according to claim 1, which is characterized in that the first Polarization Controller
It (6) include half wave plate (6-1) and the first quarter-wave plate (6-2)；Half wave plate (6-1) is located at close to second
The side of collimator (5), the first quarter-wave plate (6-2) are located at close to the side of first collimator (1).
5. dual wavelength lock-out pulse optical fiber laser according to claim 4, which is characterized in that the second Polarization Controller
(10) it is the second quarter-wave plate (10-1).
6. dual wavelength lock-out pulse optical fiber laser according to claim 4, which is characterized in that the second Polarization Controller
It (10) include a half wave plate and a quarter-wave plate.
7. dual wavelength lock-out pulse optical fiber laser according to claim 1, which is characterized in that the first grating (11),
Two gratings (12) are reflecting grating.
8. dual wavelength lock-out pulse optical fiber laser according to claim 1, which is characterized in that the first grating (11),
Two gratings (12) are transmission grating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821516147.6U CN208767607U (en) | 2018-09-17 | 2018-09-17 | A kind of dual wavelength lock-out pulse optical fiber laser |
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| CN201821516147.6U CN208767607U (en) | 2018-09-17 | 2018-09-17 | A kind of dual wavelength lock-out pulse optical fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832471A (en) * | 2018-09-17 | 2018-11-16 | 聊城大学 | A kind of dual wavelength lock-out pulse optical fiber laser |
| CN110297230A (en) * | 2019-07-15 | 2019-10-01 | 北京理工大学 | Satellite-bone laser radar Echo Signal Simulator |
-
2018
- 2018-09-17 CN CN201821516147.6U patent/CN208767607U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832471A (en) * | 2018-09-17 | 2018-11-16 | 聊城大学 | A kind of dual wavelength lock-out pulse optical fiber laser |
| CN110297230A (en) * | 2019-07-15 | 2019-10-01 | 北京理工大学 | Satellite-bone laser radar Echo Signal Simulator |
| CN110297230B (en) * | 2019-07-15 | 2021-02-12 | 北京理工大学 | Satellite-borne laser radar echo signal simulator |
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