CN108233159B - Pulse optical fiber based on relaxation effect - Google Patents
Pulse optical fiber based on relaxation effect Download PDFInfo
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- CN108233159B CN108233159B CN201810135248.7A CN201810135248A CN108233159B CN 108233159 B CN108233159 B CN 108233159B CN 201810135248 A CN201810135248 A CN 201810135248A CN 108233159 B CN108233159 B CN 108233159B
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- module
- laser
- optical fiber
- pulse
- control module
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- 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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of pulse optical fibers based on relaxation effect, including sensor module, control module, drive module and optical module, drive module is for driving pump diode, sensor module includes peak detection block and photodetector, photodetector is for detecting laser pulse, and optical signal is converted to current signal, peak detection block is used for the peak value of sensed current signal, peak detection block link control module, in a laser pulse period, control module controls drive module before detecting peak-current signal makes drive module disconnect diode.Control module can be modulated pump laser by adjusting drive module.By the modulation of control module, stop pumping, laser pulse of the available pulsewidth less than the first spike before laser-formed first pulse spike terminates in optical fiber laser.By the modulation of control module, the optical fiber laser pulse of required pulsewidth can be obtained.
Description
Technical field
The present invention relates to pulse optical fiber fields, and in particular to the pulse optical fiber based on relaxation effect.
Background technique
Optical fiber laser refers to the laser for using rare earth doped element glass optical fiber as gain media, because it is with light beam
The advantages that quality is small, photoelectric conversion efficiency is high, at low cost, stability is good, small in size generates huge shadow to traditional laser industry
It rings, optical fiber laser has been widely used in the fields such as industrial processes, optic communication, medicine, military affairs.Currently, optical fiber laser
Main function industrially is cutting, drilling, welding, mark.Wherein laser mark is that industry is maximum answers for laser processing
With one of field, the basic principle is that: the laser beam of high-energy is generated by laser generator, the laser action after focusing is in holding
Material is printed, surfacing moment is melted, or even gasification, by the path of control laser on the surface of the material, to form needs
Graphic context label.
Mainly having Q-switched laser with MOPA applied to the optical fiber laser type of industrial marking now, (main oscillations power is put
Big device) laser.Wherein, Q-switched laser cost is relatively high, and mark substrate is easily-deformable, and shading is coarse, and impulse waveform is single not
It is modulated.In comparison, MOPA optical fiber laser shading exquisiteness is indeformable, impulse waveform is modulated, and application range is wider.But
It is MOPA optical fiber laser is that laser pulse is adjusted by modulation seed source, under prior art conditions, pumping swashs
Light is not accomplished also consistent with seed source laser pulse, and such pumping laser must advance into doubly clad optical fiber in laser pulse, and
And pumping could be stopped after end-of-pulsing, therefore, the pump light in gain fibre is not fully absorbed, and leads to MOPA laser
Still there is laser output in the device inoperative period, is not achieved and completely closes.
Summary of the invention
The technical problem to be solved by the present invention is to solve above-mentioned the deficiencies in the prior art, pumping can be fully absorbed by providing one kind
The pulse optical fiber of light.
In order to solve the above-mentioned technical problem, a kind of the technical solution adopted by the present invention are as follows: pulsed light based on relaxation effect
Fibre laser, including sensor module, control module, drive module and optical module, the optical module include for generating pump
The pump diode of Pu light, the reflective grid of height and low reflective grid, the covering for removing remnant pump light for being used to form resonant cavity
Photospallation device and the laser out splice going splice exported for laser, are arranged between high reflective grid and low reflective grid for pumping
The gain fibre of laser needed for light absorption generates, for drive module for driving pump diode, sensor module includes peak value inspection
Module and photodetector are surveyed, optical signal is converted to current signal, peak value for detecting laser pulse by photodetector
Peak value of the detection module for sensed current signal, peak detection block link control module, in a laser pulse period,
Control module controls drive module before detecting peak-current signal makes drive module disconnect diode.
Further, drive module includes PWM PDM keyer, two metal-oxide-semiconductors and inductance and input and output electricity
Hold, the grid of metal-oxide-semiconductor is all connected with the on-off that PWM PDM keyer is controlled by it MOSFET, the source electrode of one of metal-oxide-semiconductor
Power supply is separately connected with error of omission and inductance is used to form inductance and magnetizes access, and the source electrode and drain electrode of another metal-oxide-semiconductor then connects respectively
It connects inductance and pump diode is used to form inductance continuous current circuit.
Further, drive module further includes current sample feedback error amplifier, voltage sample feedback error amplifier,
The end of current sample feedback error amplifier is separately connected inductance and PWM PDM keyer, voltage sample feedback error
The end of amplifier is separately connected inductance and PWM PDM keyer.
Further, the peak detection block includes trsanscondutance amplifier and ADC sampling module, trsanscondutance amplifier connection
Photoinduction electric current is converted voltage signal by photodetector and reference voltage, and ADC sampling module adopts voltage signal
Sample, and send the voltage signal sampled to control module.
It further, further include single pulse Joule energy module comprising positive error integrating circuit and ADC sampling
Module, positive error integrating circuit carry out integral to the laser output of single pulse and are converted to a constant voltage, and ADC samples mould
Block samples constant voltage, and sends sampled signal to control module.
Further, for the optical module including further including bundling device, the quantity of pump diode is multiple, pump diode
High reflective grid are reconnected after bundling device closes beam.
Further, the optical fiber of the reflective grid of the height and low reflective grid is double-clad structure, and the two combines and forms resonance
Chamber, fibre core have reflex, Gao Fanguang grid reflectivity 95%-100%, low reflective grid reflectivity 10%-30% to laser.
Further, the gain fibre is double-clad structure, and fibre core is doped with rare earth material.
From above-mentioned technical proposal it can be seen that the invention has the following advantages that control module can be by adjusting drive module
And then pump laser is modulated.By the modulation of control module, laser-formed first pulse in optical fiber laser
Spike stops pumping, laser pulse of the available pulsewidth less than the first spike before terminating.It, can be with by the modulation of control module
The optical fiber laser pulse of pulsewidth needed for obtaining.
Detailed description of the invention
Fig. 1 is functional block diagram of the invention.
Fig. 2 is the structural schematic diagram of optical module in the present invention；
Fig. 3 is the structural schematic diagram of drive module in the present invention；
Fig. 4 is the structural schematic diagram of peak detection block in the present invention；
Fig. 5 is single pulse Joule energy module in the present invention.
Specific embodiment
Below in conjunction with attached drawing, specific embodiments of the present invention will be described in detail.
As shown in Figure 1, the pulse optical fiber of the invention based on relaxation effect includes sensor module, control mould
Block, drive module and optical module.Control module can be modulated pump laser by adjusting drive module.It is logical
The modulation for crossing control module stops pumping before laser-formed first pulse spike terminates in optical fiber laser, available
Laser pulse of the pulsewidth less than the first spike.By the modulation of control module, the optical fiber laser arteries and veins of required pulsewidth can be obtained
Punching.
Wherein optical module is as shown in Fig. 2, including the pump diode 11 for generating pump light, being used to form the height of resonant cavity instead
Grating 13 and low reflective grid 15, the cladding light stripper 16 for removing remnant pump light and the laser for laser output
Out splice going splice 17, gain of the setting for laser needed for being generated to Pumping light absorption between high reflective grid 13 and low reflective grid 15
Optical fiber 14, diode is directly connect with high reflective grid when pump diode can be 1 or more, 1, and more whens can pass through
Bundling device 12 closes Shu Houzai and connect with high reflective grid, and the launch wavelength of the pump diode corresponds to gain in gain fibre and is situated between
The absorption spectra of matter, pump mode can be divided into front end forward pumping, rear end backward pumping or both ends while pump.It is described high anti-
The optical fiber of grating and low reflective grid is double-clad structure, and the two, which combines, forms resonant cavity, and fibre core has reflex to laser,
High reflective grid reflectivity 95%-100%, low reflective grid reflectivity 10%-30%.The gain fibre is double-clad structure, fine
Core can be absorbed pump light and generate wide spectrum optical doped with rare earth material, the resonant cavity formed through excessively high reflective grid and low reflective grid
Frequency-selecting after to required laser amplifier.
As shown in figure 3, drive module is for driving pump diode, drive module includes PWM PDM keyer, two
A metal-oxide-semiconductor and inductance, the grid of metal-oxide-semiconductor are all connected with the on-off that PWM PDM keyer is controlled by it MOSFET, wherein
The source electrode and error of omission of one metal-oxide-semiconductor are separately connected power supply and inductance is used to form inductance and magnetizes access, the source electrode of another metal-oxide-semiconductor
Inductance is then separately connected with drain electrode and pump diode is used to form inductive discharge circuit.Drive module further includes that current sample is anti-
Feedforward error amplifier, voltage sample feedback error amplifier, the end of current sample feedback error amplifier are separately connected inductance
With PWM PDM keyer, the end of voltage sample feedback error amplifier is separately connected inductance and PWM pulsewidth modulation control
Device processed.The driving design that laser constant-current source is carried out by the way of switched current source, using the double sampled feedback of Current Voltage
Mode, which works, exports constant laser diode current in the mode of constant frequency feedback regulation duty ratio.
Sensor module includes peak detection block, single pulse Joule energy module and photodetector, and photoelectricity is visited
Photodiode can be used by surveying device, and wherein photodetector is converted to electric current letter for detecting laser pulse, and by optical signal
Number, peak detection block is cross over amplifier connection photodetection as shown in figure 4, including trsanscondutance amplifier and ADC sampling module
Photoinduction electric current is converted voltage signal by device and reference voltage, and ADC sampling module samples voltage signal, and will adopt
Sample to voltage signal send control module to.In a laser pulse period, control module is detecting peak point current letter
Control drive module makes drive module disconnect diode before number, and control module can be using chips such as DSP, in drive module
PWM PDM keyer controlled, and then to pumping diode carry out on-off control.
Single pulse Joule energy module is as shown in Figure 5 comprising positive error integrating circuit and ADC sampling module,
Positive error integrating circuit carries out integral to the laser output of single pulse and is converted to a constant voltage, ADC sampling module pair
Constant voltage is sampled, and sends sampled signal to control module.This circuit further comprise an integral reset signal and
Zero device is reflected to guarantee the complete reset of integrating circuit, guarantees the accuracy of sampling.
Temp probe can also be set, be placed in inside optical module and be also easy to produce at high temperature, such as optical fiber fusion welding point, bundling device, mould
Formula stripper etc..Optical power probe is placed near optical fiber.Sensing module passes monitoring information back control module, can swash to optical fiber
The temperature and power of light device monitor in real time, and control module can close optical fiber laser immediately when occurring abnormal.
Pulse optical fiber of the invention has good beam quality, incident photon-to-electron conversion efficiency high, compact-sized, non-maintaining
The advantages that.It is indeformable for mark shading exquisiteness, impulse waveform is modulated, there is no impurity light between each pulse of laser, can be with
It completely closes.Optical fiber laser has real-time monitoring and control, prevents abnormal conditions from occurring, and improves safety in production.Also increase software
Control function, diversified Interface Controller realize the intelligent manipulation of optical fiber laser.
Claims (7)
1. a kind of pulse optical fiber based on relaxation effect, including sensor module, control module, drive module and light
Module, it is characterised in that: the optical module includes for generating the pump diode of pump light, being used to form the height of resonant cavity instead
Grating and low reflective grid, the cladding light stripper for removing remnant pump light and the laser output for laser output connect
Head, gain fibre of the setting for laser needed for generating to Pumping light absorption, drives mould between high reflective grid and low reflective grid
Block is for driving pump diode, and sensor module includes peak detection block and photodetector, and photodetector is used for
Laser pulse is detected, and optical signal is converted to current signal, peak detection block is used for the peak value of sensed current signal, peak value
Detection module link control module, in a laser pulse period, control module is controlled before detecting peak-current signal
Drive module processed makes drive module disconnect diode；The drive module include PWM PDM keyer, two metal-oxide-semiconductors with
And inductance, the grid of metal-oxide-semiconductor are all connected with the on-off that PWM PDM keyer is controlled by it grid, the source of one of metal-oxide-semiconductor
Pole and drain electrode are separately connected power supply and inductance is used to form inductance and magnetizes access, and the source electrode and drain electrode of another metal-oxide-semiconductor is then distinguished
Connection inductance and pump diode are used to form inductive discharge circuit.
2. the pulse optical fiber according to claim 1 based on relaxation effect, it is characterised in that: drive module is also wrapped
Include current sample feedback error amplifier, voltage sample feedback error amplifier, the end of current sample feedback error amplifier
It is separately connected inductance and PWM PDM keyer, the end of voltage sample feedback error amplifier is separately connected inductance and PWM
PDM keyer.
3. the pulse optical fiber according to claim 1 based on relaxation effect, it is characterised in that: the peak detection
Module includes trsanscondutance amplifier and ADC sampling module, and trsanscondutance amplifier connects photodetector and reference voltage, by light sensation
Electric current is answered to be converted into voltage signal, ADC sampling module samples voltage signal, and the voltage signal sampled is sent to
Control module.
4. the pulse optical fiber according to claim 1 based on relaxation effect, it is characterised in that: further include single arteries and veins
Rush Joule energy module comprising positive error integrating circuit and ADC sampling module, positive error integrating circuit is to single arteries and veins
The laser output of punching carries out integral and is converted to a constant voltage, and ADC sampling module samples constant voltage, and will sampling
Signal sends control module to.
5. the pulse optical fiber according to claim 1 based on relaxation effect, it is characterised in that: the optical module is also
Including bundling device, the quantity of pump diode is multiple, pump diode high reflective grid of reconnection after bundling device closes beam.
6. the pulse optical fiber according to claim 5 based on relaxation effect, it is characterised in that: the reflective grid of height
Optical fiber with low reflective grid is double-clad structure, and the two, which combines, forms resonant cavity, and fibre core has reflex to laser, high anti-
Optical grating reflection rate 80%-100%, low reflective grid reflectivity 10%-30%.
7. according to claim 1 based on the pulse optical fiber of relaxation effect, it is characterised in that: the gain fibre is
Double-clad structure, fibre core is doped with rare earth material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810135248.7A CN108233159B (en) | 2018-02-09 | 2018-02-09 | Pulse optical fiber based on relaxation effect |
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| CN201810135248.7A CN108233159B (en) | 2018-02-09 | 2018-02-09 | Pulse optical fiber based on relaxation effect |
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| CN108233159A CN108233159A (en) | 2018-06-29 |
| CN108233159B true CN108233159B (en) | 2019-07-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113872034B (en) * | 2021-12-02 | 2022-05-06 | 武汉锐科光纤激光技术股份有限公司 | Light beam generation device, method and apparatus, storage medium, and electronic apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801088A (en) * | 2011-05-26 | 2012-11-28 | 欧姆龙株式会社 | Light amplifier and laser processing device |
| CN203326345U (en) * | 2013-04-12 | 2013-12-04 | 上海飞博激光科技有限公司 | Optical fiber laser device |
| CN104201546A (en) * | 2014-09-01 | 2014-12-10 | 天津光拓伟业科技有限公司 | Fiber laser system with narrow-line-width and high-peak power pulse output |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6456250B2 (en) * | 2014-08-29 | 2019-01-23 | 三菱電機株式会社 | Laser apparatus and laser processing machine |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801088A (en) * | 2011-05-26 | 2012-11-28 | 欧姆龙株式会社 | Light amplifier and laser processing device |
| CN203326345U (en) * | 2013-04-12 | 2013-12-04 | 上海飞博激光科技有限公司 | Optical fiber laser device |
| CN104201546A (en) * | 2014-09-01 | 2014-12-10 | 天津光拓伟业科技有限公司 | Fiber laser system with narrow-line-width and high-peak power pulse output |
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