CN103701020B - Pulse-width-configurable Q-modulation pulse laser oscillator - Google Patents
Pulse-width-configurable Q-modulation pulse laser oscillator Download PDFInfo
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- CN103701020B CN103701020B CN201310690896.6A CN201310690896A CN103701020B CN 103701020 B CN103701020 B CN 103701020B CN 201310690896 A CN201310690896 A CN 201310690896A CN 103701020 B CN103701020 B CN 103701020B
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Abstract
The invention provides a pulse-width-configurable Q-modulation pulse laser oscillator, which comprises a laser gain and Q-modulation part, an optical fiber length configuration part and an optical fiber grating, wherein the laser gain and Q-modulation part is connected with the optical length configuration part, the optical length configuration part is connected with the optical fiber grating, the laser gain and Q-modulation part is used for generating laser, and the optical length configuration part is used for configuring the length of a Q-modulation resonant cavity. The invention realizes the laser oscillator with the advantages that the light beam quality is high, the stability is high, the pulse width is small, the peak value power is high, the cost is low, and the pulse width is configurable. The pulse-width-configurable Q-modulation pulse laser oscillator solves the problems that the light beam quality of the existing Q-modulation solid laser is poor, the stability is low, the pulse of a Q-modulation pulse optical fiber laser is wide, and the peak value power is difficult to improve.
Description
Technical field
The present invention relates to a kind of pulsewidth configurable adjusting Q pulse laser agitator.
Background technology
Laser processing technology is to utilize the laser beam characteristic with matter interaction to material (metal and non-gold
Belong to) a special kind of skill of processing.Laser Processing is widely used to national economy as advanced manufacturing technology
Pith.And industrial laser instrument will play weight as brand-new high-end manufacture equipment in every field
Act on.For continuous wave laser, pulsewidth is that the high repeat frequency pulsed laser device of nanosecond exists
Many fields such as industrial processes, health care, biochemistry detection, scientific research, military and national defense have wide
Application prospect.In many actual application, it is desirable to LASER Light Source has high repetition frequency and high beam
While quality, also there is the highest peak power.Narrowing pulsewidth is to obtain a kind of row of high-peak power
Effective technology.
Perfect light source for Laser Processing is that output beam quality is high, pulsewidth, repetition rate and its peak work
Rate is adjustable, high reliability, the LASER Light Source of high stability.Traditional all solid state Q-switched laser is with mixing
The shortcomings such as stray crystal body, as working media, has output beam poor quality, and repetition rate is low, and pulsewidth is fixing,
And it is difficult to meet the requirement of high reliability and high stability.
Although it is poor that light fiber Q-switched laser solves all solid state laser beam quality, repetition rate is fixed
With the shortcoming of poor stability, but still have that output pulse width is fixed, pulse width is longer etc. is difficult to overcome
Difficulty.
At present, fiber pulse laser based on seed light source master oscillation power amplification (MOPA) mode
Relatively high pulse energy and higher average power output can be obtained, can be used for producing high-peak power and narrow spaces
Laser pulse.But, it uses LD(laser diode, laser diode) output light as amplification
The seed light of device, owing to the seed light power of LD output is low, needs multistage amplification could obtain high output
Power.For preventing amplifier from producing self-excitation, need to add optoisolator at fiber amplifier inter-stage, increase
The production cost of product, expensive.
Obtaining wide variety of laser instrument in processing and manufacturing industry at present is diode pumping full-solid laser
Device and optical fiber Q-switched pulse laser.But both laser instrument all can not meet Laser Processing for reason
Think light source: high beam quality, pulsewidth, repetition rate and peak power are adjustable, high reliability, high stable
The requirement of property.
Optical fiber Q-switched pulse laser, using doped fiber as gain media, due to nonlinear effect, is put
The impact of the big factor such as spontaneous radiation and fiber end face damage from laser, uses optical fiber laser to realize narrow spaces
High-peak power laser output difficulty is higher.Although the output of pulse optical fiber can reach hundred
Watt magnitude, but owing to the guided wave structure formed model volume of optical fiber is little, and limited by doping content, it is single
Bit length fiber gain is low, needs longer doped fiber as gain media, and therefore Q arteries and veins adjusted by optical fiber
The oscillator cavity rushing laser instrument is the longest, and pulsewidth is wider, and peak power is difficult to improve further.
All solid state laser is using rear-earth-doped laser crystal as gain media.Increasing due to laser crystal
Benefit is high, therefore can produce narrow spaces, the laser pulse of high-peak power.But the most all solid state tune Q
The less stable of laser instrument, and its beam quality is the most poor.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of configurable adjusting Q pulse laser of pulsewidth
Agitator, solves existing solid state laser beam quality poor, and stability is low and optical fiber laser pulse width,
Peak power is difficult to the problem improved.
The present invention is achieved in that
A kind of pulsewidth configurable adjusting Q pulse laser agitator, including laser gain and tune Q portion, light
Fine length configuration section and fiber grating, described laser gain connects with fiber lengths configuration section with adjusting Q portion
Connecing, described fiber lengths configuration section is connected with fiber grating, and described laser gain is used with adjusting Q portion
In producing laser, described fiber lengths configuration section is used for configuring alternator resonant cavity length.
Further, described laser gain provides laser gain and resonance with adjusting Q portion for Q-switch laser
The Q-value modulation in chamber.
Further, described laser gain includes the most interconnective pumping source with adjusting Q portion, consolidates
Volumetric laser gain media, Q switched element, optical fiber collimator, described optical fiber collimator and described light
Fine length configuration section connects.
Further, described pumping source is that one can carry in carrying in gain medium pump absorption
For optical energy, using the teaching of the invention it is possible to provide produce the pumping energy needed for population inversion needed for gain medium lasing
The optical pump source of amount.
Further, described solid state laser gain medium is for have optical absorption and in phase at pumping wavelength
The excitation wavelength answered has laser crystal or the laser glass of stimulated radiation gain.
Further, described solid state laser gain medium there is the first height anti-away from Q switched element side
Penetrate film.
Further, described solid state laser gain medium has optical element away from Q switched element side,
And on this optical element, there are the first highly reflecting films.
Further, the first described highly reflecting films are that the excitation wavelength to solid state laser gain medium has
The highly reflecting films of high reflectance.
Further, described Q switched element is electric-optically Q-switched element.
Further, described Q switched element is acousto-optic Q modulation element.
Further, described optical fiber collimator is the optical fiber collimator with tail optical fiber.
Further, the tail optical fiber of described optical fiber collimator is single-mode fiber.
Further, described fiber lengths configuration section include the first fibre-optical splice, the second fibre-optical splice and
Fibre delay line, described fibre delay line two ends are respectively with the first fibre-optical splice, the second fibre-optical splice even
Connecing, described first fibre-optical splice is connected with adjusting Q portion with described laser gain, the second described optical fiber
Joint is connected with described fiber grating.
Further, the first described fibre-optical splice and the second fibre-optical splice can be FC joint, SC
Joint, ST joint or optical fiber collimator butt joint.
Further, described fibre delay line is single-mode fiber.
And the present invention also provides for a kind of configurable laser instrument of pulsewidth, including the laser generation being sequentially connected with
Device, the first Transmission Fibers, pump combiner, the second Transmission Fibers, isolator, beam expander, its feature
It is: described laser oscillator is any of the above-described kind of laser oscillator.
Present invention have the advantage that the laser oscillator of the present invention have that beam quality is high, stability is high,
Pulse width is configurable, peak power is high, low cost and other advantages.
Accompanying drawing explanation
The present invention is further illustrated the most in conjunction with the embodiments.
Fig. 1 is the structural representation of the preferred embodiment of the present invention.
Fig. 2 is the structural representation of another embodiment of the present invention.
Detailed description of the invention
Refer to shown in Fig. 1, below embodiments of the present invention will be described in detail.
As it is shown in figure 1, a kind of pulsewidth configurable adjusting Q pulse laser agitator, including laser gain
With tune Q portion 1, fiber lengths configuration section 2 and fiber grating 3, laser gain and tune Q portion 1 and optical fiber
Length configuration section 2 connects, and fiber lengths configuration section 2 is connected with fiber grating 3.Laser gain and tune Q
Portion 1 is used for producing laser, and fiber lengths configuration section 2 is used for configuring adjusting Q pulse laser alternator resonant
Cavity length.Laser gain can be through the light in fiber lengths configuration section 2 with the laser adjusting Q portion 1 to produce
Fine and fiber grating 3 exports.The laser oscillator of the present invention uses Free Space Optics and optical fiber to mix
Close structure, utilize the principle that the pulsewidth of laser is relevant with the chamber length of resonator cavity.Resonator length is the longest, light
Transition time in resonator cavity is the longest, and the pulsewidth of Output of laser is the widest.Fiber lengths configuration section 2
As a part for resonator cavity, by fiber lengths configuration section 2 to the optical fiber in fiber lengths configuration section 2
The configuration of length, thus change the length of resonator cavity, thus change the pulsewidth of laser output, reach swashing
The purpose of light pulsewidth configuration.
Laser gain and tune Q portion 1, as the generation part of laser, have multiple implementation, adjust Q
It is high that laser has pulse energy, and peak power is high, the adjustable advantage of laser frequency.Concrete, such as Fig. 1
Shown in, laser gain includes the most interconnective pumping source 11, solid state laser gain with adjusting Q portion 1
Medium 12, Q switched element 13, optical fiber collimator 14, optical fiber collimator 14 and fiber lengths configuration section
2 connect.Can also for as in figure 2 it is shown, laser gain and tune Q portion 1 include the most interconnective from
By spatial light Output of laser diode 15, laser shaping and collimating element 16, Q switched element 13, optical fiber
Collimator 14, optical fiber collimator 14 is connected with fiber lengths configuration section 2.
Preferably, pumping source 11 can provide light in gain medium pump absorption for one in carrying
Learn energy, using the teaching of the invention it is possible to provide produce needed for gain medium lasing pumping energy needed for population inversion
Optical pump source.Solid state laser gain medium 12 is preferably has optical absorption and in phase at pumping wavelength
The excitation wavelength answered has the solid state laser gain medium of stimulated radiation gain.Solid state laser gain medium carries
The high laser gain of confession ensure that agitator output.In order to increase coupling efficiency and the minimizing of pump light
The loss of light, has the first high reflection at solid state laser gain medium 12 away from Q switched element 13 side
Film, or away from Q switched element 13 side, there is optical element outside solid state laser gain medium, and
This optical element has the first highly reflecting films.When being embodied as, solid state laser gain medium 12 defeated
Going out end will be in the face of quasi-Q switched element 13.Q switched element 13 realizes the frequency modulation(PFM) to output light, permissible
For common electric-optically Q-switched element or acousto-optic Q modulation element.Optical fiber collimator 14 is the optical fiber with tail optical fiber
Collimator, the tail optical fiber of optical fiber collimator 14 is single-mode fiber, and the tail optical fiber of optical fiber collimator 14 is long with optical fiber
Degree configuration section 2 connects.
Fiber lengths configuration section 2 includes first fibre-optical splice the 20, second fibre-optical splice 21 and optical fiber delay
Line 22, fibre delay line 22 two ends are connected with first fibre-optical splice the 20, second fibre-optical splice 21 respectively,
First fibre-optical splice 20 is connected with adjusting Q portion 1 with laser gain, the second fibre-optical splice 21 and optical fiber light
Grid 3 connect.When laser gain is above-described embodiment with tune Q portion 1, the first fibre-optical splice 20 is concrete
Ground is connected with the optical fiber collimator 14 adjusting Q portion 1 with laser gain.Utilize the first fibre-optical splice 20 He
Second fibre-optical splice 21 can change the fibre delay line of different length easily, thus realizes configurable
Different lengths and the fibre delay line of type.Fibre delay line is single-mode fiber, the first fibre-optical splice 20
Can be FC joint, SC joint, ST joint or optical fiber collimator docking with the second fibre-optical splice 21
Head.
Concrete to the present invention as a example by the pump light at the laser oscillator of the present invention is 808nm below
Operation principle illustrates.
The pumping source that pumping source 11 uses output center wavelength to be 808nm.Laser generation as the present invention
When device is started working, pumping source 11 can send the pump light of 808nm.Ensure that the light of pumping source 11 has
Being input in solid state laser gain medium 12 of effect.Solid state laser gain medium 12 is in 808nm pumping
The lower laser producing 1064nm of the effect of light.Solid state laser gain medium 12 away from Q switched element 13
There are the first highly reflecting films side, or outer away from Q switched element 13 side tool at solid state laser gain medium
There is optical element, and on this optical element, have the first highly reflecting films.Then laser crystal 12 is defeated
Going out light and can enter Q switched element 13, Q switched element 13 has less insertion loss, it is achieved to output
The frequency modulation(PFM) of light.
The output light of Q switched element 13 can enter optical fiber collimator 14.Optical fiber collimator 14 accept from
In the laser pulse of Q switched element 13, laser pulse passes through the optical fiber collimator 14 standard to single-mode fiber
Straight coupling can play the model selection effect of single transverse mode, it is ensured that the high beam quality output of agitator.?
Rear laser is through the first fibre-optical splice 20 of fiber lengths configuration section 2, fibre delay line the 22, second light
Export after fine joint 21 and fiber grating 3.
First highly reflecting films and fiber grating 3 constitute the resonator cavity of agitator, by changing fibre delay line
The chamber that the length of 22 can significantly change resonator cavity is long, it is achieved to the pulsewidth of output laser pulse and
The modulation of peak power, and the frequency of agitator output pulse laser can be realized by Q switched element 14
Modulation, then the laser oscillator of the present invention can realize the frequency to laser pulse, pulsewidth and peak power
Modulation, thus obtain output pulse configurable stably adjust Q output.
Meanwhile, wherein, between optical fiber collimator and optical fiber extended line, output grating, optical fiber is used to connect,
The impact of vibration can be prevented effectively from.Free Space Optics part: pumping source, solid state laser gain medium,
Q switched element, optical fiber collimator can use the structure design of integration, can be prevented effectively from the impact of vibrations,
This structure through the checking of the application of commercial production for many years, has extreme high reliability.
On the basis of laser oscillator of the present invention, the present invention also provides for a kind of configurable laser of pulsewidth
Device, including the laser oscillator being sequentially connected with, the first Transmission Fibers, pump combiner, the second transmission light
Fibre, isolator, beam expander, laser oscillator is above-mentioned laser oscillator.
Although the foregoing describing the detailed description of the invention of the present invention, but it is familiar with the technology people of the art
Member should be appreciated that our described specific embodiment is merely exemplary rather than for this
The restriction of bright scope, those of ordinary skill in the art are in the equivalence made according to the spirit of the present invention
Modify and change, all should contain in the scope of the claimed protection of the present invention.
Claims (15)
1. a pulsewidth configurable adjusting Q pulse laser agitator, it is characterised in that: include that laser increases
Benefit and tune Q portion, fiber lengths configuration section and fiber grating, described laser gain includes with adjusting Q portion
The most interconnective pumping source, solid state laser gain medium, Q switched element and optical fiber collimator, institute
The optical fiber collimator stated is connected with described fiber lengths configuration section, described solid state laser gain medium,
Described Q switched element, described optical fiber collimator, described fiber lengths configuration section and described light
Fine optical grating constitution produces the oscillator cavity of laser；Described laser gain is long with optical fiber with tune Q portion
Degree configuration section connects, and described fiber lengths configuration section is connected with fiber grating；Described laser gain with
Adjusting Q portion to be used for producing laser, described fiber lengths configuration section is used for configuring alternator resonant cavity length,
By configuring the fiber lengths in described fiber lengths configuration section, it is achieved joining of alternator resonant cavity length
Put, thus the pulsewidth realizing agitator can configure.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described laser gain provides laser gain and resonator cavity with adjusting Q portion for Q-switch laser
Q-value is modulated.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described pumping source can provide light in gain medium pump absorption for one in carrying
Learn energy, using the teaching of the invention it is possible to provide produce needed for gain medium lasing pumping energy needed for population inversion
Optical pump source.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described solid state laser gain medium is for have optical absorption and accordingly at pumping wavelength
Excitation wavelength has laser crystal or the laser glass of stimulated radiation gain.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: on described solid state laser gain medium, have the first highly reflecting films away from Q switched element side.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described solid state laser gain medium has optical element away from Q switched element side, and
And on this optical element, have the first highly reflecting films.
7. shake according to the arbitrary described configurable adjusting Q pulse laser of a kind of pulsewidth of claim 5 or 6
Swing device, it is characterised in that: the first described highly reflecting films are the excitation wavelength to solid state laser gain medium
There are the highly reflecting films of high reflectance.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described Q switched element is electric-optically Q-switched element.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1, its
It is characterised by: described Q switched element is acousto-optic Q modulation element.
A kind of pulsewidth configurable adjusting Q pulse laser agitator the most according to claim 1,
It is characterized in that: described optical fiber collimator is the optical fiber collimator with tail optical fiber.
11. a kind of pulsewidth configurable adjusting Q pulse laser agitators according to claim 10,
It is characterized in that: the tail optical fiber of described optical fiber collimator is single-mode fiber.
12. a kind of pulsewidth configurable adjusting Q pulse laser agitators according to claim 1,
It is characterized in that: described fiber lengths configuration section includes the first fibre-optical splice, the second fibre-optical splice and light
Fine delay line, described fibre delay line two ends one end, the second optical fiber with the first fibre-optical splice respectively connects
One end of head connects, and the other end of described first fibre-optical splice is with described laser gain with tune Q portion even
Connecing, the other end of the second described fibre-optical splice is connected with described fiber grating.
13. a kind of pulsewidth configurable adjusting Q pulse laser agitators according to claim 12,
It is characterized in that: the first described fibre-optical splice and the second fibre-optical splice be FC joint, SC joint,
ST joint or optical fiber collimator butt joint.
14. a kind of pulsewidth configurable adjusting Q pulse laser agitators according to claim 12,
It is characterized in that: described fibre delay line is single-mode fiber.
15. 1 kinds of configurable laser instrument of pulsewidth, including the laser oscillator being sequentially connected with, the first transmission
Optical fiber, pump combiner, the second Transmission Fibers, isolator and beam expander, it is characterised in that: described
Laser oscillator is the arbitrary described laser oscillator of claim 1 to 14.
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| CN201310690896.6A CN103701020B (en) | 2013-12-17 | 2013-12-17 | Pulse-width-configurable Q-modulation pulse laser oscillator |
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| CN201310690896.6A CN103701020B (en) | 2013-12-17 | 2013-12-17 | Pulse-width-configurable Q-modulation pulse laser oscillator |
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| US20160165709A1 (en) * | 2014-12-05 | 2016-06-09 | Asml Netherlands B.V. | System and Method for Isolating Gain Elements in a Laser System |
| CN106785845A (en) * | 2017-01-22 | 2017-05-31 | 昆山华辰光电科技有限公司 | Variable impulse width Q adjusting optical fiber laser |
| CN109818236A (en) * | 2019-01-03 | 2019-05-28 | 上海金光柔生物科技有限公司 | A kind of more pulsewidth multifunction lasers and laser therapeutic apparantus |
| CN109683242B (en) * | 2019-02-28 | 2023-06-16 | 华南理工大学 | All-optical diode controllable unidirectional light transmission device and method |
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| US20100296527A1 (en) * | 2008-09-25 | 2010-11-25 | Ofs Fitel Llc | Passively modelocked fiber laser using carbon nanotubes |
| TWI407654B (en) * | 2009-02-23 | 2013-09-01 | Univ Nat United | Wavelength or pulse width tunable fiber mode-locked laser |
| CN102684049A (en) * | 2012-05-10 | 2012-09-19 | 清华大学 | Optical fiber laser device |
| CN103151684A (en) * | 2013-02-20 | 2013-06-12 | 广东汉唐量子光电科技有限公司 | Pulse pump type standing wave resonant cavity nanosecond pulse laser |
| CN103414093B (en) * | 2013-04-28 | 2016-10-19 | 北京工业大学 | A kind of all-fiber pulse laser |
| CN203631967U (en) * | 2013-12-17 | 2014-06-04 | 福建中科光汇激光科技有限公司 | Pulse-width configurable Q-switching pulse laser oscillator |
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