CN109638623A - The switchable pulse optical fiber of bimodulus dual wavelength - Google Patents
The switchable pulse optical fiber of bimodulus dual wavelength Download PDFInfo
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- CN109638623A CN109638623A CN201910102554.5A CN201910102554A CN109638623A CN 109638623 A CN109638623 A CN 109638623A CN 201910102554 A CN201910102554 A CN 201910102554A CN 109638623 A CN109638623 A CN 109638623A
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- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1061—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a variable absorption device
-
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
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- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of switchable pulse optical fibers of bimodulus dual wavelength, are used as transverse mode converter and wavelength selector simultaneously using dislocation method and dual mode optical fiber grating.Its saturated absorption of mode locking mechanism based on semiconductor saturable absorbing mirror has and polarizes uncorrelated characteristic, avoids mode conversion relevant to polarization and wavelength selection phase crosstalk.Semiconductor saturable absorbing mirror and dual mode optical fiber grating are connected to laser cavity by four port circulators, light from four port circulator ports -1 is reflected by the semiconductor saturable absorbing mirror of port -2, into port -3 respectively by dislocation point with after the conversion of dual mode optical fiber grating mode and wavelength selection, pass through -4 return cavity of port.The laser is worked respectively on basic mode and the wavelength of second-order high-order mode, exports second-order high-order mode and basic mode light beam respectively in dual mode optical fiber grating output end.This laser is simple, inexpensive wavelength-division/mode division multiplexing light source, according to circumstances adjusts the output state of light beam.
Description
Technical field
The present invention relates to fiber laser technology field more particularly to a kind of switchable pulsed optical fibre lasers of bimodulus dual wavelength
Device.
Background technique
In recent years, due to the data requirements sharp increase that internet drives, single mode optical fiber network transmission capacity is just close
The Shannon limit.In order to further increase the capacity of single mode optical fiber Transmission system and solve growing tension bandwidth resources bottle
Neck problem, the multiplexing technique based on multimode fibre or multimode fibre have become a kind of promising solution.Therefore, it grinds
The optical fiber laser for studying carefully transmitting high order mode is of great significance.
Other than for mode division multiplexing transmission, less fundamental mode optical fibre is in device (such as optical taper, coupler based on less fundamental mode optical fibre
And grating) mode manipulation in also have important application.By taking fiber bragg grating as an example, since mould each in less fundamental mode optical fibre is independent
And have different propagation constants, so few mode fiber Bragg grating can reflect by raster phase matching condition determine with
The different moulds determined by less fundamental mode optical fibre spatial distribution.Early stage its application, less fundamental mode optical fibre grating swashs for multi-wavelength optical fiber
Light device, wherein each wavelength corresponds to different transverse modes, but specific transverse mode is not distinguished.Less fundamental mode optical fibre grating
High-order mode optical fiber laser is realized by the wavelength of mode needed for controlling as mode converter.Various exportable height
The optical fiber laser of rank mode has been reported.Wherein having a kind of optical fiber laser is using few mode fiber Bragg grating as anti-
Element and mode filter are penetrated, this mode selecting method has been successfully applied to various all -fiber mode-locked lasers and has adjusted Q optical fiber
Laser.For example, the radial polarised rectangular pulse that a kind of all -fiber mode-locked laser generates, is locked by a 8-shaped chamber
What vertical pattern and a few mode fiber Bragg grating selection transverse mode generated.Optical fiber laser transverse mode selector
Design include two Polarization Controllers, a few mode fiber Bragg grating and a misplaces fusion point, by two sections of optical fiber with
The mode welding of 4.1m transversion malposition forms.Another method is based on the model selection being made of single mode optical fiber and less fundamental mode optical fibre
All -fiber melts coupler, realizes high-order mode pulsed laser using model selection coupler.
Under continuous wave work, by adjusting the polarization state of light in laser cavity, the output mode of laser can choose
For basic mode LP01 mode, second-order high-order mode LP11 mode or mixed mode.But since the method that mode locking pulse generates is usually
Polarize it is relevant, with high-order mode selection be easy to interact, while implementation pattern selection and mode locking have certain challenge.
Summary of the invention
Goal of the invention: technical problem to be solved by the present invention lies in overcome the polarization interference of model selection and mode locking to ask
Topic, provide it is a kind of can based on the selection of less fundamental mode optical fibre grating mode and the bimodulus dual wavelength of semiconductor saturable absorbing mirror passive mode-locking
Switching pulse optical fiber laser.
Technical solution: in the present invention, dual mode optical fiber grating and semiconductor saturable absorbing mirror pass through a four ports annular
Device is connected to the laser ring cavity of laser, respectively implementation pattern selection and passive mode-locking function, less fundamental mode optical fibre and single mode optical fiber
Welding magnitude of misalignment by optimization, laser can works respectively in the correspondence wave of basic mode (LP01) and second-order high-order mode (LP11)
In length, second-order high-order mode and basic mode light beam are exported respectively in two mode fiber grating output ends.If magnitude of misalignment selection is suitable, also
The hybrid guided mode of basic mode and second-order high-order mode can be exported.
The specific technical proposal is: the switchable pulse optical fiber of bimodulus dual wavelength of the present invention, including pumping source, wavelength-division are multiple
With device, Er-doped fiber, four port circulators, semiconductor saturable absorbing mirror, two mode fiber gratings and output coupler；Wherein,
The output end of pumping source is connected with the pumping input terminal of wavelength division multiplexer, and the output end of wavelength division multiplexer and Er-doped fiber phase
Even；After Er-doped fiber output end connects a Polarization Controller, the port -1 of four port circulators is accessed；Four port circulators
Port -2 is connected to a semiconductor saturated absorption mirror, and the port -3 of four port circulators is connected to dual mode optical fiber grating；Four port rings
The port -4 of shape device is connected to the coupler of a 10:90, and as output, 90% port is connected to wavelength division multiplexer for 10% port
Signal input part.The a length of 13.5m of the laser cavity of total laser is carved with the long 1m of two mode fibers of grating.
Semiconductor saturable absorbing mirror and dual mode optical fiber grating therein is connected to laser annular by four port circulators
Chamber, the light from four port circulator ports -1 is by the semiconductor saturable absorbing mirror reflection on port -2, subsequently into end
Mouth -3 is respectively by dislocation point and the progress mode conversion of two mode fiber gratings and wavelength selection, finally by -4 return cavity of port.
Dual mode optical fiber is connected with single mode optical fiber uses dislocation welding, and magnitude of misalignment is optimized.
Working principle: laser of the invention is using the dislocation method and dual mode optical fiber grating of optimization simultaneously as lateral mould
Formula converter and wavelength selector.Its saturated absorption of mode locking mechanism based on semiconductor saturable absorbing mirror has polarization not
Correlation properties avoid mode conversion relevant to polarization and wavelength selection phase crosstalk.In the laser, semiconductor saturable is inhaled
It receives mirror and dual mode optical fiber grating is connected to the laser ring cavity of laser by a four port circulators, from four ports annular
The light of device port -1 passes through dislocation point by the semiconductor saturable absorbing mirror reflection on port -2, subsequently into port -3 respectively
Mode conversion and wavelength selection are carried out with dual mode optical fiber grating, finally by -4 return laser light chamber of port.The laser can be distinguished
Work exports in the corresponding wavelength of basic mode (LP01) and second-order high-order mode (LP11) in dual mode optical fiber grating output end respectively
Second-order high-order mode and basic mode light beam.If magnitude of misalignment selection is suitable, the mixing of basic mode and second-order high-order mode can also be exported
Mould.This full-optical-fiber laser is wavelength-division/mode division multiplexing light source, can adjust the output state of light beam as the case may be.
The operation wavelength of zlasing mode and laser in the present invention all relies on dislocation welding method and less fundamental mode optical fibre light
Grid.By the appropriate adjustment to Polarization Controller, the laser for obtaining LP01 mode and LP11 mode respectively works independently mode,
And laser work mode can be distinguished by the operation wavelength of laser.Further, it is also possible to be obtained from optical fiber laser
Angular polarization light beam and radial polarized light beam.
The utility model has the advantages that all devices of the invention are all made of all -fiber coupled modes, do not interfered by extraneous factor, it can be continuous
Steady operation；Dual mode optical fiber is connected with single mode optical fiber uses dislocation welding, and magnitude of misalignment is optimized, so that inspiring
High-order mode and basic mode ratio highest.The selection of dual mode optical fiber grating implementation pattern is that polarization is relevant, and semiconductor saturable is inhaled
It is that polarization is unrelated that mirror, which is received, for mode locking.
The present invention uses above technical scheme is compared with the prior art, has the advantage that (1) mode locking of the present invention uses
High-order mode relevant to polarization is selected phase crosstalk by semiconductor saturable absorbing mirror, polarization-independent characteristic；(2) dual mode optical fiber
It is optimized with the magnitude of misalignment of single mode optical fiber dislocation welding, allows the high-order mode inspired and basic mode ratio highest, so that laser
The operation wavelength of device can switch in high-order mode and basic mode；(3) present invention uses all optical fibre structure, is a kind of simple, low cost
Wavelength-division/mode division multiplexing light source, the output state of light beam can be adjusted as the case may be, in laboratory environments can continuous work
Make, and can also self-starting.
Therefore, the flexible switching of effective solution of the present invention high-order mode and basic mode and mode locking high-order mode select polarization interference
Problem.
Detailed description of the invention
Fig. 1 is the switchable pulse optical fiber structural schematic diagram of bimodulus dual wavelength in the present invention；
Fig. 2 is high-order mode and basic mode energy ratio with magnitude of misalignment variation diagram；
(3-1) is the switchable pulse optical fiber output spectrum of bimodulus dual wavelength in Fig. 3；
(3-2) is the train of pulse of the switchable pulse optical fiber output of bimodulus dual wavelength in Fig. 3；
Fig. 4 is the intensity distribution for exporting TM01 (a) and TE01 (f) mould, and the variation rotated with linear polarization；
Fig. 5 is the intensity distribution for exporting basic mode.
Specific embodiment
As shown in Figure 1, the switchable pulse optical fiber of bimodulus dual wavelength of the present invention, including pumping source 1, wavelength division multiplexer
2,5 meters of Er-doped fiber 3, Polarization Controller 4, four port circulators 5, semiconductor saturable absorbing mirror 6, dual mode optical fiber grating 7,
Output coupler 8, spectrometer 9, oscillograph 10 and the ccd image sensor 11 of 10:90；Wherein, the output end and wave of pumping source 1
The pumping input terminal of division multiplexer 2 is connected, and the output end of wavelength division multiplexer 2 is connected with Er-doped fiber 3；Er-doped fiber 3 it is defeated
After outlet connects a Polarization Controller 4, the port -1 of four port circulators 5 is accessed；The port -2 of four port circulators is connected to
The port -3 of one semiconductor saturable absorbing mirror, four port circulators is connected to dual mode optical fiber grating 7；The end of four port circulators
Mouth -4 is connected to the output coupler 8 of a 10:90, and as output, 90% port is connected to the letter of wavelength division multiplexer 2 for 10% port
Number input terminal.
Wherein laser semiconductor saturable absorbing mirror and dual mode optical fiber grating are connected to laser by four port circulators 5
The laser ring cavity of device, the light from four port circulator ports -1 are anti-by the semiconductor saturable absorbing mirror on port -2
It penetrates, mode conversion and wavelength selection is carried out by dislocation point and dual mode optical fiber grating respectively subsequently into port -3, finally by
- 4 return laser light annular chamber of port.
Dual mode optical fiber is connected with single mode optical fiber uses dislocation welding, and magnitude of misalignment is optimized.
As shown in Fig. 2, the present invention passes through the LP11 mode and LP01 that Modeling Calculation is excited in different magnitude of misalignment
The ratio between mode of energy, when magnitude of misalignment is 4.8 μm, the ratio between LP11 mode and LP01 mode of energy are maximum, i.e. LP11 mode excitation
Efficiency highest.
Mode locking mechanism is the saturated absorption based on semiconductor saturable absorbing mirror, the operation wavelength of zlasing mode and laser
All rely on dislocation welding technology and less fundamental mode optical fibre grating.By the appropriate adjustment to Polarization Controller, LP01 is obtained respectively
The laser of mode and LP11 mode works independently mode, and laser work mould can be distinguished by the operation wavelength of laser
Formula.Further, it is also possible to obtain angular polarization light beam and radial polarized light beam from optical fiber laser.
When pump power is more than modelocking threshold 150mw, laser is easy to recall mode-lock status.In the entire experiment process,
The power of pump is maintained at 200mw.It is keeping dual mode optical fiber grating straight, mode state is being influenced very when adjusting Polarization Controller
Greatly.By the adjusting to Polarization Controller, LP01 mode at 1552.9nm can be respectively obtained and at 1551.5nm
The mode locking working condition of LP11 mode is such as schemed shown in (3-1).The 3dB narrow bandwidth that laser exports under both of which is both less than
0.02nm.For the train of pulse of laser as shown in figure (3-2), the basic repetitive rate of pulse corresponds to the length of chamber.The radio frequency of measurement
Frequency spectrum signal-to-noise ratio is 50dB, shows that optical fiber laser is with good stability.
When laser spectrum is located at right peak (the LP01 mode) as shown in figure (3-1), dual mode optical fiber optical grating reflection returns LP01 mould
Formula, while exporting LP11.By adjusting the available radial direction of PC2 and PC3 (TE01) and angular (TM01) light beam, such as Fig. 4
In (a) and (f) shown in.By being inserted into linear polarization between collimator and CCD camera lens, TE01 and TM01 mould can be distinguished
State.The arrow in (b)-(e) and (g)-(j) in Fig. 4 respectively indicates the transmission direction of polarizer.(b)-(e) in Fig. 4
In, the intensity pattern of two lobed shapes is consistent with the direction of linear polarization, illustrates that the light beam generated is TM01.On the contrary, when two
When direction is vertical, the light beam of generation is TE01.Mode purity, respectively 91.54% He are calculated with the method for Function Fitting
90.24%.Therefore, light beam can be considered the non-coherent addition of strong LP11 mode Yu weak LP01 mode.
In this mode locked fiber laser, dual mode optical fiber grating is as wavelength selector, not with Polarization Controller
Disconnected adjustment, laser spectrum can be located at left peak (LP11 mode) shown in figure (3-1).Dual mode optical fiber optical grating reflection LP11 mode,
Basic mode then passes through TM-FBG.Therefore, LP01 mode can be measured in the end of TM-FBG by CCD.The intensity of LP01 mode
Distribution is as shown in Figure 5.
It is calculated by numerical value and experimental verification, the reflectance spectrum and dislocation of dual mode optical fiber grating are sharp apart from closely related
The control of patterned optical output opens up a new way.Here, it when dislocation distance changes into 4.5 μm, can respectively obtain
Mode locking oscillation of the LP01 mould at 1552.9nm and mutual coupling molding 1552.2nm.As the 1552.9nm that oscillation wavelength is LP01 mould
When, the light beam of dual mode optical fiber grating output is LP11 mould, similar with above situation.When oscillation wavelength is mutual coupling molding
When 1552.2nm, the output beam of TM-FBG should be the superposition of LP01 and LP11 mode.
It is worth noting that the switchable bimodulus and dual wavelength modelocked fiber proposed by the present invention based on dual mode optical fiber grating
Laser, it is very crucial for carrying out mode locking using semiconductor saturable absorbing mirror, because semiconductor saturable absorbing mirror is inclined
Vibration independence.Since the reflection of less fundamental mode optical fibre grating has very strong polarization dependence, polarization independent mode locking mechanism is such as selected, such as
Nonlinear polarization rotation can select with the transverse mode of less fundamental mode optical fibre grating and polarization is caused to interfere.This is to say, if lock
Mould and model selection condition all rely on polarization, then are difficult to meet the two conditions simultaneously.
Claims (9)
1. a kind of switchable pulse optical fiber of bimodulus dual wavelength, it is characterised in that: including pumping source, wavelength division multiplexer, mix
Erbium optical fiber, Polarization Controller, four port circulators, semiconductor saturable absorbing mirror and dual mode optical fiber grating and output coupling
Device；The output end of the pumping source is connected with the pumping input terminal of wavelength division multiplexer, and the output end of wavelength division multiplexer and er-doped
Optical fiber is connected；Er-doped fiber output end accesses the port -1 of four port circulators；The dual mode optical fiber grating and semiconductor can satisfy
The laser cavity of the laser is connected to implementation pattern selection and passive mode-locking by four port circulators with absorbing mirror；It is described
The light of the port -1 of four port circulators is by the semiconductor saturable absorbing mirror reflection on port -2, subsequently into -3 points of port
It Tong Guo not misplace a little and two mode fiber gratings carry out mode conversion and wavelength selection, finally by the port -4 of four port circulators
Return to the laser cavity.
2. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the laser
It is used as transverse mode converter and wavelength selector simultaneously by dislocation and dual mode optical fiber grating, is based on semiconductor saturable absorption
The saturated absorption of mirror avoids mode conversion relevant to polarization and wavelength selection phase crosstalk.
3. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the laser
It works in the corresponding wavelength of basic mode (LP01) and second-order high-order mode (LP11), distinguishes in dual mode optical fiber grating output end respectively
Export second-order high-order mode and basic mode light beam.
4. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the laser
In the hybrid guided mode of dual mode optical fiber grating output end output basic mode and second-order high-order mode.
5. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the bimodulus light
Fine grating is located on dual mode optical fiber.
6. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the coupler
For the coupler of 10:90, as output, 90% port is connected to the signal input of wavelength division multiplexer for 10% port of the coupler
End.
7. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the semiconductor
Saturable absorbing mirror and two mode fiber gratings are connected to the laser ring cavity by four port circulators.
8. the switchable pulse optical fiber of bimodulus dual wavelength according to claim 1, it is characterised in that: the er-doped light
Fine output end accesses the port -1 of four port circulators by Polarization Controller.
9. the switchable pulse optical fiber of bimodulus dual wavelength according to any one of claim 1 to 8, feature exist
In: the laser cavity is laser ring cavity.
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| CN201910102554.5A CN109638623A (en) | 2019-02-01 | 2019-02-01 | The switchable pulse optical fiber of bimodulus dual wavelength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993728A (en) * | 2021-03-03 | 2021-06-18 | 电子科技大学 | C + L wave band rectangular laser pulse generation system with all-fiber structure |
| CN114927927A (en) * | 2022-03-10 | 2022-08-19 | 电子科技大学 | Single-frequency narrow linewidth Q-switched laser |
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| CN1595736A (en) * | 2004-06-25 | 2005-03-16 | 南开大学 | Convertible dual-wavelength doping optical fiber laser |
| CN102544999A (en) * | 2012-02-01 | 2012-07-04 | 中国科学技术大学 | All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof |
| CN106253039A (en) * | 2016-08-30 | 2016-12-21 | 南京邮电大学 | Single longitudinal mode low noise arrowband based on Active Optical Fiber Ring Resonator post vector optical fiber laser |
| CN108233160A (en) * | 2018-03-13 | 2018-06-29 | 南京邮电大学 | A kind of pulsed column vector optical fiber laser based on model selection coupler |
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2019
- 2019-02-01 CN CN201910102554.5A patent/CN109638623A/en active Pending
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| CN1595736A (en) * | 2004-06-25 | 2005-03-16 | 南开大学 | Convertible dual-wavelength doping optical fiber laser |
| CN102544999A (en) * | 2012-02-01 | 2012-07-04 | 中国科学技术大学 | All-fiber axisymmetric polarized beam laser based on less-mode fiber bragg grating and generating method thereof |
| CN106253039A (en) * | 2016-08-30 | 2016-12-21 | 南京邮电大学 | Single longitudinal mode low noise arrowband based on Active Optical Fiber Ring Resonator post vector optical fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993728A (en) * | 2021-03-03 | 2021-06-18 | 电子科技大学 | C + L wave band rectangular laser pulse generation system with all-fiber structure |
| CN114927927A (en) * | 2022-03-10 | 2022-08-19 | 电子科技大学 | Single-frequency narrow linewidth Q-switched laser |
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Application publication date: 20190416 |