CN103701020A - Pulse-width-configurable Q-modulation pulse laser oscillator - Google Patents
Pulse-width-configurable Q-modulation pulse laser oscillator Download PDFInfo
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- CN103701020A CN103701020A CN201310690896.6A CN201310690896A CN103701020A CN 103701020 A CN103701020 A CN 103701020A CN 201310690896 A CN201310690896 A CN 201310690896A CN 103701020 A CN103701020 A CN 103701020A
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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 the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth.
Background technology
Laser processing technology is a special kind of skill to material (metal and nonmetal) processing of characteristic of utilizing laser beam and matter interaction.Laser processing has been widely used in the pith of national economy as advanced manufacturing technology.And industrial laser will play a significant role as brand-new high-end manufacturing equipment in every field.For continuous wave laser, the high repeat frequency pulsed laser device that pulsewidth is nanosecond all has broad application prospects in many fields such as industrial processes, health care, biochemistry detection, scientific research, military and national defense.In many practical applications, require LASER Light Source when thering is high repetition frequency and high light beam quality, also to there is very high peak power.Narrowing pulsewidth is a kind of effective technology that obtains high-peak power.
Perfect light source for laser processing is that output beam quality is high, pulsewidth, and repetition rate and peak power are adjustable, high reliability, the LASER Light Source of high stability.The shortcomings such as traditional all solid state Q-switched laser as working media, has output beam poor quality with doped crystal, and repetition rate is low, and pulsewidth is fixing, and be difficult to meet the requirement of high reliability and high stability.
Although it is poor that optical fiber Q-switched laser has solved all solid state laser beam quality, repetition rate is fixed the shortcoming with poor stability, still has output pulse width and fixes, the long difficulty that is difficult to overcome that waits of pulse duration.
At present, the fiber pulse laser based on seed light source master oscillation power amplification (MOPA) mode can obtain compared with high pulse energy and higher average power output, can be used for producing high-peak power and narrow pulse width laser pulse.But it uses LD(laser diode, laser diode) output light as the seed light of amplifier, because the seed light power of LD output is low, need multistage amplification could obtain high-output power.For preventing that amplifier from producing self-excitation, need to add optical isolator at fiber amplifier inter-stage, increased the production cost of product, expensive.
Laser in processing and manufacturing industry acquisition extensive use is diode pumping full-solid laser and optical fiber Q-switched pulse laser at present.But these two kinds of lasers all can not meet laser processing for perfect light source: high beam quality, and pulsewidth, repetition rate and peak power are adjustable, high reliability, the requirement of high stability.
Optical fiber Q-switched pulse laser is usingd doped fiber as gain media, due to the impact of the factors such as nonlinear effect, amplified spontaneous emission and fiber end face laser damage, adopts fiber laser to realize narrow pulsewidth high-peak power Laser output difficulty higher.Although the power output of pulse optical fiber can reach hectowatt magnitude, but because the guided wave structure formed mode volume of optical fiber is little, and be subject to the restriction of doping content, its unit length fiber gain is low, doped fiber that need to be longer is as gain media, therefore the oscillator cavity of optical fiber Q-switched pulse laser is generally longer, and pulsewidth is wider, and peak power is difficult to further raising.
All solid state laser is usingd rear-earth-doped laser crystal as gain media.Because the gain of laser crystal is high, therefore can produce narrow pulsewidth, the laser pulse of high-peak power.But the also therefore less stable of all solid state Q-switched laser, and its beam quality is generally poor.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of pulsewidth configurable adjusting Q pulse laser oscillator, solves existing solid state laser beam quality poor, and stability is low and fiber laser pulse is wide, and peak power is difficult to the problem improving.
The present invention is achieved in that
The configurable adjusting Q pulse laser oscillator of a kind of pulsewidth, comprise laser gain and adjust Q portion, fiber lengths configuration section and fiber grating, described laser gain is connected with fiber lengths configuration section with adjusting Q portion, described fiber lengths configuration section is connected with fiber grating, described laser gain is with tune Q portion for generation of laser, and described fiber lengths configuration section is used for configuring oscillator cavity length.
Further, described laser gain is modulated for Q-switch laser provides the Q value of laser gain and resonant cavity with adjusting Q portion.
Further, described laser gain comprises interconnective pumping source, solid state laser gain medium, Q switched element successively with adjusting Q portion, optical fiber collimator, and described optical fiber collimator is connected with described fiber lengths configuration section.
Further, described pumping source can provide optical energy for a kind of in gain medium pump absorption can be with, and can provide and produce the sharp optical pump source of penetrating the required pumping energy of required population inversion of gain medium.
Further, described solid state laser gain medium is for having optical absorption and having at corresponding excitation wavelength laser crystal or the laser glass that stimulated radiation gains at pumping wavelength.
Further, on described solid state laser gain medium, away from Q switched element one side, there are the first highly reflecting films.
Further, described solid state laser gain medium has optical element away from Q switched element one side, and has the first highly reflecting films on this optical element.
Further, the first described highly reflecting films are for having the highly reflecting films of high reflectance to the excitation wavelength of solid state laser gain medium.
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 monomode fiber.
Further, described fiber lengths configuration section comprises the first optical fiber splice, the second optical fiber splice and fibre delay line, described fibre delay line two ends are connected with the first optical fiber splice, the second optical fiber splice respectively, described the first optical fiber splice is connected with adjusting Q portion with described laser gain, and the second described optical fiber splice is connected with described fiber grating.
Further, the first described optical fiber splice and the second optical fiber splice can be FC joint, SC joint, ST joint or optical fiber collimator butt joint.
Further, described fibre delay line is monomode fiber.
And the present invention also provides a kind of pulsewidth configurable laser, comprise the laser oscillator, the first Transmission Fibers, pump combiner, the second Transmission Fibers, isolator, the beam expander that connect successively, it is characterized in that: described laser oscillator is above-mentioned any laser oscillator.
Tool of the present invention has the following advantages: laser oscillator of the present invention has that beam quality is high, stability is high, pulse duration is configurable, peak power is high, low cost and other advantages.
Accompanying drawing explanation
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
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.
Embodiment
Refer to shown in Fig. 1, below will be elaborated to embodiments of the present invention.
As shown in Figure 1, the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth, comprise laser gain and adjust Q portion 1, fiber lengths configuration section 2 and fiber grating 3, laser gain is connected with fiber lengths configuration section 2 with adjusting Q portion 1, and fiber lengths configuration section 2 is connected with fiber grating 3.Laser gain is with tune Q portion 1 for generation of laser, and fiber lengths configuration section 2 is for configuring adjusting Q pulse laser oscillator cavity length.Laser gain can be exported through optical fiber and fiber grating 3 in fiber lengths configuration section 2 with the laser of adjusting Q portion 1 to produce.Laser oscillator of the present invention adopts Free Space Optics and fiber mix structure, utilizes the long relevant principle in the pulsewidth of laser and the chamber of resonant cavity.Resonator is longer, and the transit time of light in resonant cavity is longer, and the pulsewidth of Output of laser is also just wider.Fiber lengths configuration section 2 is as a part for resonant cavity, by the configuration of the fiber lengths in 2 pairs of fiber lengths configuration sections 2 of fiber lengths configuration section, thereby changes the length of resonant cavity, thereby changes the pulsewidth of Laser output, reaches the object to laser pulse width configuration.
Laser gain and the generating portion of adjusting Q portion 1 as laser, have multiple implementation, and it is high that Q-switch laser has pulse energy, and peak power is high, the advantage that laser frequency is adjustable.Concrete, as shown in Figure 1, laser gain comprises interconnective pumping source 11, solid state laser gain medium 12, Q switched element 13 successively with adjusting Q portion 1, optical fiber collimator 14, and optical fiber collimator 14 is connected with fiber lengths configuration section 2.Also can be for as shown in Figure 2, laser gain comprises interconnective free space optical Output of laser diode 15, laser shaping and collimating element 16, Q switched element 13 successively with adjusting Q portion 1, optical fiber collimator 14, optical fiber collimator 14 is connected with fiber lengths configuration section 2.
Preferably, pumping source 11 can provide optical energy for a kind of in gain medium pump absorption can be with, and can provide and produce the sharp optical pump source of penetrating the required pumping energy of required population inversion of gain medium.Solid state laser gain medium 12 is preferably at pumping wavelength to be had optical absorption and has at corresponding excitation wavelength the solid state laser gain medium that stimulated radiation gains.The high laser gain that solid state laser gain medium provides has guaranteed oscillator power output.In order to increase the loss of coupling efficiency and the minimizing light of pump light, at solid state laser gain medium 12, away from Q switched element 13 1 sides, there are the first highly reflecting films, or away from Q switched element 13 1 sides, there is optical element outside solid state laser gain medium, and there are the first highly reflecting films on this optical element.During concrete enforcement, the output of solid state laser gain medium 12 will be faced accurate Q switched element 13.Q switched element 13 is realized the modulation of output light frequency, can be common electric-optically Q-switched element or acousto-optic Q modulation element.Optical fiber collimator 14 is the optical fiber collimator with tail optical fiber, and the tail optical fiber of optical fiber collimator 14 is monomode fiber, and the tail optical fiber of optical fiber collimator 14 and fiber lengths configuration section 2 are joined.
Fiber lengths configuration section 2 comprises the first optical fiber splice 20, the second optical fiber splice 21 and fibre delay line 22, fibre delay line 22 two ends are connected with the first optical fiber splice 20, the second optical fiber splice 21 respectively, the first optical fiber splice 20 is connected with adjusting Q portion 1 with laser gain, and the second optical fiber splice 21 is connected with fiber grating 3.When laser gain is above-described embodiment with tune Q portion 1, the first optical fiber splice 20 is connected with adjusting the optical fiber collimator 14 of Q portion 1 with laser gain particularly.Utilize the first optical fiber splice 20 and the second optical fiber splice 21 can change easily the fibre delay line of different length, thereby realize the fibre delay line of configurable different lengths and type.Fibre delay line is monomode fiber, and the first optical fiber splice 20 and the second optical fiber splice 21 can be FC joint, SC joint, ST joint or optical fiber collimator butt joint.
To be 808nm describe specific works principle of the present invention as example the pump light of take below at laser oscillator of the present invention.
The output light of Q switched element 13 can enter optical fiber collimator 14.Optical fiber collimator 14 accepts to come from the laser pulse of Q switched element 13, and laser pulse can play the model selection effect of single transverse mode by optical fiber collimator 14 to the collimation coupling of monomode fiber, guarantees the high beam quality output of oscillator.Last laser is exported after the first optical fiber splice 20, fibre delay line 22, the second optical fiber splice 21 and the fiber grating 3 of fiber lengths configuration section 2.
The first highly reflecting films and fiber grating 3 form the resonant cavity of oscillator, by changing the length of fibre delay line 22, can significantly to change the chamber of resonant cavity long, the modulation of realization to the pulsewidth of output laser pulse and peak power, and the frequency of oscillator output pulse laser can realize modulation by Q switched element 14, laser oscillator of the present invention can be realized the modulation of frequency, pulsewidth and peak power to laser pulse, thereby obtains the configurable stable tune Q output of output pulse.
Meanwhile, wherein, between optical fiber collimator and optical fiber extended line, output grating, use optical fiber to connect, can effectively avoid the impact of vibration.Free Space Optics part: pumping source, solid state laser gain medium, Q switched element, optical fiber collimator can adopt integrated structural design, can effectively avoid the impact of vibrations, this structure through the checking of industrial production application for many years, has extreme high reliability.
On the basis of laser oscillator of the present invention, the present invention also provides a kind of pulsewidth configurable laser, comprise the laser oscillator, the first Transmission Fibers, pump combiner, the second Transmission Fibers, isolator, the beam expander that connect successively, laser oscillator is above-mentioned laser oscillator.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present invention; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (16)
1. the configurable adjusting Q pulse laser oscillator of pulsewidth, it is characterized in that: comprise laser gain and adjust Q portion, fiber lengths configuration section and fiber grating, described laser gain is connected with fiber lengths configuration section with adjusting Q portion, described fiber lengths configuration section is connected with fiber grating, described laser gain is with tune Q portion for generation of laser, and described fiber lengths configuration section is used for configuring oscillator cavity length.
2. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 1, is characterized in that: described laser gain is modulated for Q-switch laser provides the Q value of laser gain and resonant cavity with adjusting Q portion.
3. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 1, it is characterized in that: described laser gain comprises interconnective pumping source, solid state laser gain medium, Q switched element successively with adjusting Q portion, optical fiber collimator, described optical fiber collimator is connected with described fiber lengths configuration section.
4. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, it is characterized in that: described pumping source can provide optical energy for a kind of in gain medium pump absorption can be with, can provide and produce the sharp optical pump source of penetrating the required pumping energy of required population inversion of gain medium.
5. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, is characterized in that: described solid state laser gain medium is for having optical absorption and having at corresponding excitation wavelength laser crystal or the laser glass that stimulated radiation gains at pumping wavelength.
6. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, is characterized in that: on described solid state laser gain medium, away from Q switched element one side, have the first highly reflecting films.
7. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, is characterized in that: described solid state laser gain medium has optical element away from Q switched element one side, and has the first highly reflecting films on this optical element.
8. according to the arbitrary described configurable adjusting Q pulse laser oscillator of a kind of pulsewidth of claim 6 or 7, it is characterized in that: the first described highly reflecting films are for having the highly reflecting films of high reflectance to the excitation wavelength of solid state laser gain medium.
9. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, is characterized in that: described Q switched element is electric-optically Q-switched element.
10. the configurable adjusting Q pulse laser oscillator of a kind of pulsewidth according to claim 3, is characterized in that: described Q switched element is acousto-optic Q modulation element.
The configurable adjusting Q pulse laser oscillator of 11. a kind of pulsewidth according to claim 3, is characterized in that: described optical fiber collimator is the optical fiber collimator with tail optical fiber.
The configurable adjusting Q pulse laser oscillator of 12. a kind of pulsewidth according to claim 11, is characterized in that: the tail optical fiber of described optical fiber collimator is monomode fiber.
The configurable adjusting Q pulse laser oscillator of 13. a kind of pulsewidth according to claim 1, it is characterized in that: described fiber lengths configuration section comprises the first optical fiber splice, the second optical fiber splice and fibre delay line, described fibre delay line two ends are connected with the first optical fiber splice, the second optical fiber splice respectively, described the first optical fiber splice is connected with adjusting Q portion with described laser gain, and the second described optical fiber splice is connected with described fiber grating.
The configurable adjusting Q pulse laser oscillator of 14. a kind of pulsewidth according to claim 11, is characterized in that: the first described optical fiber splice and the second optical fiber splice can be FC joint, SC joint, ST joint or optical fiber collimator butt joint.
The configurable adjusting Q pulse laser oscillator of 15. a kind of pulsewidth according to claim 11, is characterized in that: described fibre delay line is monomode fiber.
16. 1 kinds of configurable lasers of pulsewidth, comprise the laser oscillator, the first Transmission Fibers, pump combiner, the second Transmission Fibers, isolator, the beam expander that connect successively, it is characterized in that: described laser oscillator is the arbitrary described laser oscillator of claim 1 to 15.
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| 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 |
| CN107003550A (en) * | 2014-12-05 | 2017-08-01 | Asml荷兰有限公司 | System and method for the booster element in isolation laser system |
| CN109683242A (en) * | 2019-02-28 | 2019-04-26 | 华南理工大学 | A kind of controllable uni-directional light flow device and method of all-optical diode |
| 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 |
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