CN107123925A - Laser and the method based on gain grating compression pulse width and raising energy - Google Patents
Laser and the method based on gain grating compression pulse width and raising energy Download PDFInfo
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- 230000006835 compression Effects 0.000 title claims abstract description 36
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- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims description 59
- 238000005086 pumping Methods 0.000 claims description 46
- 230000008878 coupling Effects 0.000 claims description 28
- 238000010168 coupling process Methods 0.000 claims description 28
- 238000005859 coupling reaction Methods 0.000 claims description 28
- 230000010287 polarization Effects 0.000 claims description 19
- 239000011521 glass Substances 0.000 claims description 7
- 229910017502 Nd:YVO4 Inorganic materials 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
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- 230000003287 optical effect Effects 0.000 description 9
- 238000001914 filtration Methods 0.000 description 8
- 230000003595 spectral effect Effects 0.000 description 8
- 230000003044 adaptive effect Effects 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000021615 conjugation Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 210000003462 vein Anatomy 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
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- 230000000737 periodic effect Effects 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
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- 238000009738 saturating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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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
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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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
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Abstract
The invention belongs to the invention belongs to laser technology field, and in particular to a kind of new super-short pulse laser and the method based on gain grating compression pulse width and raising energy.Method comprises the following steps：Adjustment external pulse seed laser passes through first laser gain media at a certain angle；Adjust whole ring resonator length and pulse laser mould field size；Control pulse laser to enter second laser gain media, amplify pulsed laser energy；After the laser transmission coefficient for adjusting pulse laser, first laser gain media is horizontally entered into again；Partial pulse laser reflection is returned four-wave mixing is formed in first laser gain media, utilization space hole-burning effect and beam interference effect produce gain grating, realize pulse compression, output squeezing pulse.Using the characteristic of gain grating, in the research applied to outside injection laser pulse width compression, pulse energy is exaggerated while realizing outside injection Laser pulse compression by brand-new thinking.
Description
Technical field
The invention belongs to laser technology field, more particularly to a kind of new super-short pulse laser and based on gain grating pressure
Vena contracta it is wide and improve energy method.
Background technology
The technological means of currently acquired ultra-short pulse laser is mainly locked mode, but passes through surpassing that traditional locked mode mode is realized
Short-pulse laser such as femto-second laser has the shortcomings that fairly obvious, such as complicated, condition of work is to intracavitary luminous power
Density and external environment are very sensitive etc..The reason for disadvantages mentioned above one side is due to that current ultrashort pulse laser is usual
It is to produce periodic modulation using passive nonlinear device, or vibration light beam is entered using the nonlinear effect of active medium in itself
Row intensity modulated, PGC demodulation.Ultrashort pulse laser requires that intracavity power density is sufficiently high, but excessive automodulation can draw
The unstable of locked mode is played, disturbance to external world is very sensitive, therefore obtain the condition ten of femto-second laser pulse in this way
Divide harshness；On the other hand, the repetition rate of mode-locked laser is usually MHz magnitudes, with higher repetition rate and higher
Average output power, but its single pulse energy is relatively low.Directly obtained by mode-locking technique between high repetition frequency Laser pulse time
Every very small, in material processing, laser pulse can not disperse in time with the plasma produced during material effects,
Plasma Shielding Effection can be produced, Laser Processing efficiency and quality is had a strong impact on.Experimental studies results show, work as repetition rate
During less than 1MHz, plasma screen effect is weaker, and pulsed laser energy is higher, and processing speed and processing effect are obviously improved.
Meanwhile, mode-locked laser mechanical sensitivity is high, and light path calibration is difficult.In order to reduce the repetition frequency of mode-locked laser
Rate, while improving mean power and pulse energy, keeps pulse stability, it is necessary to additionally use pulse selector, laser amplifier
The equipment such as device, hence it is evident that add the complexity, technical difficulty and cost of laser system.
The gain grating that is produced based on ring resonator is main by four-wave mixing effect, self Pumped Phase Conjugation Effect and double
The nonlinear effects such as phase conjugation effect are acted on and formed, with nonlinear characteristic, Adaptive matching optical maser wavelength, more than 1
Diffraction efficiency, high space and spectral selectivity etc..The fundamental mechanism for forming gain grating is that two beam coherent beams increase in saturation
Any phase information formed in spatial hole burning, coherent beam is interfered all to be written in gain grating in beneficial medium, the light
Grid can be counted as three-dimensional volume hologram, can carry out spatial modulation, time-modulation, spectral filtering and phase to the laser of generation
Compensation etc..The G.A.Rakuljic and V.Leyva in the U.S. utilize two wave mixing effects in photorefractive material, realize projection-type
With reflective holographic body grating, filtering bandwidth 0.0125nm (Opt.Lett.1993,18 (6):459~461).M.J.Damzen
The filtering characteristic and spectrum evolutionary process of seminar's theoretical research gain grating, result of study are proved using gain grating
In Adaptive Laser Resonator, gain grating can modeling realize single longitudinal mode laser export (IEEE J.of Quantum
Electron.2000,36(7):802~809).These researchs show, using four-wave mixing effect formation phase conjugation, produce
Gain grating, can be controlled to the space of laser, frequency spectrum and transient response, can realize spectral filtering to intracavity beam.
Although research of the foreign study personnel in terms of gain grating spectral filtering makes great progress, not yet
The spectral filtering characteristic of gain grating is made full use of, in the research applied to injection laser pulse width compression.Meanwhile, traditional arteries and veins
Punching press compression method will greatly lose pulse energy due to make use of non-linear compression technology or having used narrow band filter, because
This is difficult that high efficiency, high-energy ultrashort pulse compression output are realized from principle.
The content of the invention
To solve high dependency of the technology tradition mode-locked ultrashort pulse laser to working environment, and traditional pulse pressure
The problem of contracting technical efficiency is extremely low, it is proposed by the present invention it is a kind of based on gain grating compression pulse width and improve energy method and swash
Light device, being capable of adaptive optical spectral filter, modeling, compensation phase, acquisition high light beam quality, high impulse energy in the range of gain bandwidth
The laser output of amount, has great potentiality in terms of pulse compression and pulse energy amplification, has further expanded gain light
The application of grid.
The technical solution of the present invention is to provide a kind of laser, and it is characterized in that：Including pulse seed laser 1
With ring resonator, it is adjustable that above-mentioned ring resonator includes the first laser gain media 31 that is set gradually along light path, position
The adjustable lens group 53 of prism 51, the lens spacing of being all-trans, second laser gain media 32, non-commutative elements and output coupling mirror 7；
Also include the first semiconductor pumping sources 33 and the second semiconductor pumping sources 34, the He of the first semiconductor pumping sources 33
Second semiconductor pumping sources 34 are respectively that first laser gain media 31 and second laser gain media 32 provide gain；
The pulse laser that pulse seed laser 1 is sent is at a certain angle by first laser gain media 31, then successively
In-position is adjustable to be all-trans prism 51 and the adjustable lens group 53 of lens spacing, above-mentioned position is adjustable be all-trans prism 51 with thoroughly
The adjustable lens group 53 of mirror spacing is respectively used to adjust whole ring resonator length and pulse laser mould field size；Pass through second again
Gain medium 32, above-mentioned second laser gain media 32 is used to amplify pulsed laser energy；Afterwards by non-commutative elements,
Level is again by first laser gain media 31 after adjustment laser transmission coefficient size, finally by the outgoing of output coupling mirror 7.
Pulse seed laser passes twice through first laser gain media with certain angle, in first laser gain media,
Pulse seed laser is intersecting with certain angle, and utilization space hole-burning effect and beam interference effect produce gain grating, outside note
The pulse seed laser entered comes and goes vibration in annular resonance intracavitary, realizes pulse compression.In second laser gain media 32, outside
The pulse seed laser of portion's injection comes and goes vibration in annular resonance intracavitary, extracts the gain of second laser gain media 32, enters one
Step realizes pulse energy amplification.First precision stepper motor is manipulated by control computer and drives the prism that is all-trans, is realized to ring
The accurate control of shape Resonant Intake System；The position that second precision stepper motor controls lens group is manipulated by control computer, realized
Accurate control to annular resonance intracavitary pulse laser mould field size.Changed with this and optimize gain in first laser gain media
The spectral filtering characteristic and nonlinear characteristic of grating, realize high efficiency pulse compression, final output ultra-short pulse laser.
Preferably, above-mentioned laser also include being located at 1/2 wave plate 21 between pulse seed laser 1 and ring resonator,
1/2 wave plate 22 between non-commutative elements and first laser gain media 31, positioned at first laser gain media 31 and coupling
Close 1/2 wave plate 23 between outgoing mirror 7；Two between the adjustable prism 51 that is all-trans of first laser gain media 31 and position
Individual completely reflecting mirror 41,42, it is adjustable positioned at lens spacing positioned at the completely reflecting mirror 43 being all-trans between prism 51 and lens group 53
Completely reflecting mirror 44 between microscope group 53 and second laser gain media 32, positioned at second laser gain media 32 and non-commutative elements
Between completely reflecting mirror 45 and the completely reflecting mirror 46 between non-commutative elements and first laser gain media 31.
Preferably, above-mentioned non-commutative elements include polarization splitting prism 61, the Faraday rotator 62,1/2 set gradually
Wave plate 24, polarization splitting prism 63.
Preferably, the adjustable prism 51 that is all-trans in above-mentioned position is in precision stepper motor 52；Said lens spacing can
The lens group 53 of tune is arranged in precision stepper motor 54；Along the pulse impulse light path is moved above-mentioned precision stepper motor 54.
Preferably, above-mentioned first laser gain media 31 and second laser gain media 32 are Nd:YAG、Nd:YVO4、Nd:
GdO4、Nd:YLF、Yb:YAG、Nd:Laser crystal, glass or the ceramics of the rare earth doped elements of Glass.
Preferably, the above-mentioned semiconductor pumping sources 34 of first semiconductor pumping sources 33 and second are single semiconductor bar bar or many
Individual semiconductor bar bar.
The present invention also provides another laser, and it is characterized in that：Including pulse seed laser 1 and annular resonance
Chamber, above-mentioned ring resonator includes an a unit and at least one b unit, and above-mentioned a units are disposed with first along light path and swashed
Optical gain medium 31, the adjustable prism 51 that is all-trans in position, the adjustable lens group 53 of lens spacing, second laser gain media 32 and
Non-commutative elements；
A units also include the first semiconductor pumping sources 33 and the second semiconductor pumping sources 34, and above-mentioned first is semiconductor pumped
Source and the second semiconductor pumping sources 34 are respectively that first laser gain media 31 and second laser gain media 32 provide gain；
The b units are disposed with the 3rd gain medium 35 along light path, the 4th gain medium 36, nonreciprocal
Mirror 7 is penetrated in element and coupling output；
B units also include the 3rd semiconductor pumping sources 37 and the 4th semiconductor pumping sources 38, and the above-mentioned 3rd is semiconductor pumped
The semiconductor pumping sources 38 of source 37 and the 4th are respectively that the 3rd gain medium 35 and the 4th gain medium 36 provide gain；
The emergent light of a units enters b units by 1/2 wave plate；
The pulse laser that pulse seed laser 1 is sent is at a certain angle by first laser gain media 31, then successively
In-position is adjustable to be all-trans prism 51 and the adjustable lens group 53 of lens spacing, the position is adjustable be all-trans prism 51 with thoroughly
The adjustable lens group 53 of mirror spacing is respectively used to adjust whole ring resonator length and pulse laser mould field size；Pass through second again
Gain medium 32, the second laser gain media 32 is used to amplify pulsed laser energy；Afterwards by non-commutative elements,
Adjust after laser transmission coefficient size, rear level is sequentially entered again by first laser gain media 31, then by 1/2 wave plate
After 3rd gain medium 35, the 4th gain medium 36, non-commutative elements, pass through the 3rd laser at a certain angle again
Gain media 35, the last outgoing of output coupling mirror 7.
Pulse seed laser 1 passes twice through the gain medium of first laser gain media 31 and the 3rd with certain angle
35, in the gain medium 35 of first laser gain media 31 and the 3rd, pulse seed laser 1 is intersecting with certain angle, profit
Gain grating is produced with effects of spatial and beam interference effect, the pulse seed laser 1 of outside injection is humorous in two groups of annulars
The intracavity round trip that shakes vibrates, and realizes pulse compression.First semiconductor pumping sources 33, the second semiconductor pumping sources 34, the 3rd semiconductor
Pumping source 37, the 4th semiconductor pumping sources 38 respectively first laser gain media 31, second laser gain media the 32, the 3rd swash
Optical gain medium 35, the 4th gain medium 36 provide gain.It is situated between in the laser gain of second laser gain media 32 and the 4th
In matter 36, the pulse seed laser 1 of outside injection comes and goes in annular resonance intracavitary to shake, and extracts second laser gain media 32 and the
The gain of four gain mediums 38, furthermore achieved that pulse energy is amplified.Accurate stepping electricity is manipulated by control computer
Machine 52 drives the prism 10 that is all-trans to adjust, and realizes the accurate control to ring resonator length；Accurate step is manipulated by control computer
The drive lens group 53 of stepper motor 54 is adjusted, and realizes the accurate control to annular resonance intracavitary pulse laser mould field size.Changed with this
Become and optimize the spectral filtering characteristic and non-thread of gain grating in the gain medium 35 of first laser gain media 31 and the 3rd
Property characteristic, realizes high efficiency pulse compression, final output ultra-short pulse laser.
The present invention also provides a kind of method based on gain grating compression pulse width and raising energy, comprises the following steps：
1) make pulse seed laser 1 at a certain angle by the after the phase for the pulse seed laser 1 for adjusting outside injection
One gain medium 31；
2) whole annular resonance is adjusted by adjusting the light path from the pulse laser of the outgoing of first laser gain media 31
Chamber is long；Whole ring resonator pulse laser mould field size is adjusted again；
3) pulse laser after control adjustment laser mould field enters second laser gain media 32, amplifies pulse laser energy
Amount；
4) after the laser transmission coefficient of the pulse laser after adjustment amplification, first laser gain media is horizontally entered into again
31；
5) set-up procedure 4) in first laser gain media 31 outgoing pulse laser phase after, by partial pulse laser
It is reflected back in first laser gain media 31 and forms four-wave mixing, utilization space hole-burning effect and beam interference effect produces gain
Grating, realizes pulse compression, output squeezing pulse.
Preferably, the phase of the pulse seed laser 1 of outside injection can be adjusted by 1/2 wave plate 21；
The light path of pulse laser is adjusted by the adjustable prism 51 that is all-trans in position, whole ring resonator laser pulse mould field
Adjusted by the adjustable lens group 53 of lens spacing；
Above-mentioned steps 2) be specially：
Pulse laser from the outgoing of first laser gain media 31 is by the adjustable prism 51 that is all-trans in position, by adjusting position
Putting the light path of the position adjustment laser pulse of the adjustable prism 51 that is all-trans, to adjust whole ring resonator long；
The adjustable lens group 53 of lens spacing is reflexed to through the prism 51 that is all-trans again, whole ring is adjusted by adjusting lens spacing
Shape resonator pulse laser mould field size.
Preferably, step 4) in amplify after the laser transmission coefficient of pulse laser adjusted by non-commutative elements, it is described
Non-commutative elements include polarization splitting prism 61, Faraday rotator 62,1/2 wave plate 24, the polarization splitting prism set gradually
63。
Preferably, step 5) in reflected by output coupling mirror 7 and output par, c pulse laser；Pass through precision stepper motor
52 controls are all-trans the position of prism 51；The spacing of lens in lens group 53 is controlled by precision stepper motor 52.
Step 2 can be repeated several times in partial pulse laser in the pulse laser that above-mentioned output coupling mirror 7 reflects) to step
5)。
The beneficial effects of the invention are as follows：
The present invention in the research applied to outside injection laser pulse width compression, is passed through using the characteristic of gain grating
Brand-new thinking is exaggerated pulse energy while realizing outside injection Laser pulse compression, compared to the arteries and veins occurred at present
Rushing compress mode has good, the expansible advantage of efficiency high, adaptability.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention one；
Fig. 2 is the structural representation of the embodiment of the present invention two；
Reference is in figure：1- pulse seed laser, 21,22,23,24,25,26,27-1/2 wave plates, 31- first swash
Optical gain medium, 32- second laser gain medias, the semiconductor pumping sources of 33- first, the semiconductor pumping sources of 34- second, 35-
Three gain mediums, the gain mediums of 36- the 4th, the semiconductor pumping sources of 37- the 3rd, the semiconductor pumping sources of 38- the 4th,
41st, 42,43,44,45,46,47,48,49,411- completely reflecting mirrors, 51- is all-trans prism, and 52,54- precision stepper motors, 53- is saturating
Microscope group, 61,63,64,65- polarization splitting prisms, 62,621- circulators, 7- output coupling mirrors.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
The inventive method is mainly included the following steps that：
1) make pulse seed laser 1 at a certain angle (with first after the phase for the pulse seed laser 1 for adjusting outside injection
The angle of the horizontal plane of gain medium 31) pass through first laser gain media 31；
2) whole annular resonance is adjusted by adjusting the light path from the pulse laser of the outgoing of first laser gain media 31
Chamber is long；Again whole ring resonator pulse laser is adjusted by adjusting the lens spacing in the adjustable lens group 53 of lens spacing
Mould field size；
3) pulse laser after control adjustment laser mould field enters second laser gain media 32, amplifies pulse laser energy
Amount；
4) pulse laser after amplifying passes through after non-commutative elements, adjustment laser transmission coefficient size, horizontally enters into again
First laser gain media 31；
5) set-up procedure 4) in first laser gain media 31 outgoing pulse laser phase after, reach pulse laser
Pulse laser part is reflected back in first laser gain media 31 and forms four-wave mixing by output coupling mirror 7, output coupling mirror 7,
Utilization space hole-burning effect and beam interference effect produce gain grating, realize pulse compression, and compression pulse is exported by coupling
Mirror 7 is exported；Step 2 is repeated several times in partial pulse laser in the pulse laser that output coupling mirror 7 reflects) to step 5).
The phase of the pulse seed laser 1 of outside injection is adjusted by 1/2 wave plate 21；Adjusted by precision stepper motor 52
It is all-trans the position of prism 51, while adjusting the spacing of lens in lens group 53, step 2 by precision stepper motor 54) can have
Body is：
Pulse laser from the outgoing of first laser gain media 31 is by the adjustable prism 51 that is all-trans in position, by adjusting position
Putting the light path of the position adjustment laser pulse of the adjustable prism 51 that is all-trans, to adjust whole ring resonator long；
The adjustable lens group 53 of lens spacing is reflexed to through the prism 51 that is all-trans again, whole ring is adjusted by adjusting lens spacing
Shape resonator pulse laser mould field size.
Embodiment one
It will be seen from figure 1 that the present embodiment laser includes pulse seed laser 1 and ring resonator, the annular is humorous
The chamber that shakes is adjustable complete including the first laser gain media 31 set gradually along light path, completely reflecting mirror 41, completely reflecting mirror 42, position
The adjustable lens group 53 of anti-prism 51, completely reflecting mirror 43, lens spacing, completely reflecting mirror 44, second laser gain media 32, it is all-trans
Penetrate mirror 45, non-commutative elements, completely reflecting mirror 46,1/2 wave plate 22 and output coupling mirror 7；Pulse seed laser 1 and ring resonator
Between be additionally provided with 1/2 wave plate 21.
Non-commutative elements include polarization splitting prism 61, Faraday rotator 62,1/2 wave plate 24, the polarization set gradually
Amici prism 63.
Also include the first semiconductor pumping sources 33 and the second semiconductor pumping sources 34, the first semiconductor pumping sources 33 and second
Semiconductor pumping sources 34 are respectively that first laser gain media 31 and second laser gain media 32 provide gain；First laser increases
Beneficial medium 31 and second laser gain media 32 are Nd:YAG、Nd:YVO4、Nd:GdO4、Nd:YLF、Yb:YAG、Nd:Glass etc.
Laser crystal, glass or the ceramics of rare earth doped element.First semiconductor pumping sources 33 and the second semiconductor pumping sources 34 are single
Individual semiconductor bar bar or multiple semiconductor bar bars.
Position is adjustable be all-trans prism 51 and the adjustable lens group 53 of lens spacing be separately mounted to precision stepper motor 52,
On 54.Precision stepper motor is manipulated by control computer and impulse optical propagation direction is moved along the pulse.Precision stepper motor 52 drives
The prism 51 that is all-trans is moved, and realizes the accurate control to ring resonator length；The drive lens group 53 of precision stepper motor 54, realization pair
The accurate control of annular resonance intracavitary pulse laser mould field size.
Wherein, pulse seed laser 1 passes through first laser gain at a certain angle after the adjustment phase place of 1/2 wave plate 21
Medium 31, the prism 51 that is all-trans is reflexed to through completely reflecting mirror 41 and 42, and the prism 51 that is all-trans is arranged in precision stepper motor 52, is realized
Accurate control to Resonant Intake System.Pulse laser enters lens group 53 by completely reflecting mirror 43 again, by adjusting in lens group 53
Lens spacing, realize control to pulsed laser beam size.After being reflected through completely reflecting mirror 44, pulse laser enters second and swashed
Optical gain medium 32, realizes that pulse energy is amplified.Polarization splitting prism 61, Faraday rotator 62,1/2 wave plate 24, polarization point
Light prism 63 constitutes non-commutative elements, changes the transmission system clockwise and anticlockwise of non-commutative elements by rotating 1/2 wave plate 24
Number size.Laser pulse is by being again introduced into first laser gain media 31 after non-commutative elements, the laser with first time injection
Pulse is intersecting with certain angle, after first laser gain media 31, through the adjustment phase place of 1/2 wave plate 23, output coupling mirror 7
Divide to return to after reflection and four-wave mixing is formed in first laser gain media 31, utilization space hole-burning effect and beam interference effect production
Raw gain grating, realizes pulse compression, compression pulse is exported by output coupling mirror 7；The part arteries and veins that output coupling mirror 7 is reflected back
Impulse light can repeatedly pass sequentially through first laser gain media 31, the prism 51 that is all-trans, lens group 53, second laser gain media
32nd, first laser gain media 31 is again introduced into after non-commutative elements, pulse compression is realized, compression pulse passes through output coupling mirror
7 outputs.
Embodiment two
Figure it is seen that the present embodiment laser includes pulse seed laser 1 and ring resonator, the annular is humorous
The chamber that shakes is adjustable complete including the first laser gain media 31 set gradually along light path, completely reflecting mirror 41, completely reflecting mirror 42, position
The adjustable lens group 53 of anti-prism 51, completely reflecting mirror 43, lens spacing, completely reflecting mirror 44, second laser gain media 32, it is all-trans
Penetrate mirror 45, non-commutative elements, completely reflecting mirror 46,1/2 wave plate 22,1/2 wave plate 23, the 3rd gain medium 35,1/2 wave plate
26th, completely reflecting mirror 47, completely reflecting mirror 48, the 4th gain medium 36, completely reflecting mirror 49, polarization splitting prism 64, faraday
Circulator 621,1/2 wave plate 27, polarization splitting prism 65, completely reflecting mirror 411 and output coupling mirror 7, are node with 1/2 wave plate 23
Constitute successively two groups of ring-shaped components i.e. ring resonator (the need for can be according to pulse compression rate and pulse energy, ring resonator
Number can constantly extend), in addition to 1/2 wave plate 21 being arranged between pulse seed laser 1 and ring resonator.
Also include the first semiconductor pumping sources 33, the second semiconductor pumping sources 34, the 3rd semiconductor pumping sources 37 and the 4th
Semiconductor pumping sources 38, the first semiconductor pumping sources 33, the second semiconductor pumping sources 34, the 3rd semiconductor pumping sources 37 and the 4th
Semiconductor pumping sources 38 be respectively first laser gain media 31, second laser gain media 32, the 3rd gain medium 35,
4th gain medium 36 provides gain；First laser gain media 31, second laser gain media 32, the 3rd laser gain
Medium 35, the 4th gain medium 36 are Nd:YAG、Nd:YVO4、Nd:GdO4、Nd:YLF、Yb:YAG、Nd:Glass etc. adulterates
Laser crystal, glass or the ceramics of rare earth element.First, second, third and the 4th semiconductor pumping sources be single semiconductor bar
Bar or multiple semiconductor bar bars.
Position is adjustable be all-trans prism 51 and the adjustable lens group 53 of lens spacing be separately mounted to precision stepper motor 52,
On 54.Precision stepper motor is manipulated by control computer and impulse propagation path of light is moved along the pulse.Precision stepper motor 52 drives
Be all-trans prism 51, realizes the accurate control to ring resonator length；The drive lens group 53 of precision stepper motor 54, is realized to annular
The accurate control of pulse laser mould field size in resonator.
Wherein, pulse seed laser 1 passes through first laser gain after the adjustment phase place of 1/2 wave plate 21 with certain angle
Medium 31, the prism 51 that is all-trans is reflexed to through completely reflecting mirror 41 and 42, and the prism 51 that is all-trans is arranged in precision stepper motor 52, is realized
Accurate control to Resonant Intake System.Pulse laser enters lens group 53 by completely reflecting mirror 43 again, by adjusting in lens group 53
Lens spacing, realize control to pulsed laser beam size.After being reflected through completely reflecting mirror 44, pulse laser enters second and swashed
Optical gain medium 32, realizes that pulse energy is amplified.Polarization splitting prism 61, Faraday rotator 62,1/2 wave plate 24, polarization point
Light prism 63 constitutes non-commutative elements, changes the transmission system clockwise and anticlockwise of non-commutative elements by rotating 1/2 wave plate 24
Number size.Laser pulse is by being again introduced into first laser gain media 31 after non-commutative elements, the laser with first time injection
Pulse is intersecting with certain angle, after first laser gain media 31, and the 3rd laser is entered after the adjustment phase place of 1/2 wave plate 23
Gain media 35, is reflected through the 4th gain medium 36 through completely reflecting mirror 47 and completely reflecting mirror 48, realizes that pulse energy is put
Greatly.Polarization splitting prism 64, Faraday rotator 621,1/2 wave plate 27, polarization splitting prism 65 constitute non-commutative elements, pass through
Rotate the transmission coefficient size clockwise and anticlockwise that 1/2 wave plate 27 changes non-commutative elements；Laser pulse passes through nonreciprocal member
The 3rd gain medium 35 is again introduced into after part, the laser pulse of injection is intersected with certain angle with first time, passes through the 3rd
After gain medium 35, through the adjustment phase place of 1/2 wave plate 26, first laser gain Jie is returned to after the reflection of the part of output coupling mirror 7
Four-wave mixing is formed in matter 31, utilization space hole-burning effect and beam interference effect produce gain grating, realize pulse compression, press
Vena contracta punching is exported by output coupling mirror 7.The partial pulse laser that output coupling mirror 7 is reflected back can repeatedly pass sequentially through first and swash
After optical gain medium 31, the prism 51 that is all-trans, lens group 53, second laser gain media 32, non-commutative elements, again by first
The 3rd laser gain Jie is again introduced into after gain medium 31, the 3rd gain medium 35, the 4th gain medium 36
Matter 35 realizes pulse compression, and compression pulse is exported by output coupling mirror 7.
Claims (10)
1. a kind of laser, it is characterised in that：Including pulse seed laser (1) and ring resonator, the ring resonator bag
Include the first laser gain media (31) set gradually along light path, the adjustable prism that is all-trans (51) in position, lens spacing adjustable
Lens group (53), second laser gain media (32), non-commutative elements and output coupling mirror (7)；
Also include the first semiconductor pumping sources (33) and the second semiconductor pumping sources (34), first semiconductor pumping sources and the
Two semiconductor pumping sources (34) are respectively that first laser gain media (31) and second laser gain media (32) provide gain；
The pulse laser that pulse seed laser (1) is sent with certain angle by first laser gain media (31), then successively
The adjustable prism that is all-trans (51) in in-position and the adjustable lens group of lens spacing (53), the adjustable prism that is all-trans in the position
(51) it is respectively used to adjust whole ring resonator length and pulse laser mould field size with the adjustable lens group of lens spacing (53)；
Again by second laser gain media (32), the second laser gain media (32) is used to amplify pulsed laser energy；Afterwards
By non-commutative elements, the level after laser transmission coefficient size that adjusts, again by first laser gain media (31), is finally led to
Overcoupling outgoing mirror (7) outgoing.
2. laser according to claim 1, it is characterised in that：Also include humorous positioned at pulse seed laser (1) and annular
Shake 1/2 wave plate (21) between chamber, 1/2 wave plate (22) between non-commutative elements and first laser gain media (31),
1/2 wave plate (23) between first laser gain media (31) and output coupling mirror (7)；Positioned at first laser gain media
(31) two completely reflecting mirrors (41) (42) between the adjustable prism that is all-trans (51) in position, positioned at the prism that is all-trans (51) and lens
Completely reflecting mirror (43) between group (53), positioned at the adjustable lens group of lens spacing (53) and second laser gain media (32) it
Between completely reflecting mirror (44), positioned at completely reflecting mirror (45) of the second laser gain media (32) between non-commutative elements and be located at
Completely reflecting mirror (46) between non-commutative elements and first laser gain media (31)；The non-commutative elements include setting gradually
Polarization splitting prism (61), Faraday rotator (62), 1/2 wave plate (24), polarization splitting prism (63)；The position is adjustable
The prism that is all-trans (51) be arranged on precision stepper motor (52) on；The adjustable lens group of lens spacing (53) is arranged on precision
On stepper motor (54)；Along the pulse impulse light path is moved the precision stepper motor (54).
3. laser according to claim 2, it is characterised in that：The first laser gain media (31) and second laser
Gain media (32) is Nd:YAG、Nd:YVO4、Nd:GdO4、Nd:YLF、Yb:YAG、Nd:The laser of the rare earth doped elements of Glass
Crystal, glass or ceramics.
4. laser according to claim 3, it is characterised in that：First semiconductor pumping sources (33) and the second semiconductor pump
Pu source (34) is single semiconductor bar bar or multiple semiconductor bar bars.
5. a kind of laser, it is characterised in that：Including pulse seed laser (1) and ring resonator, the ring resonator bag
An a unit and at least one b unit are included, a units are disposed with first laser gain media (31), position along light path
The adjustable prism that is all-trans (51), the adjustable lens group of lens spacing (53), second laser gain media (32) and non-commutative elements；
A units also include the first semiconductor pumping sources (33) and the second semiconductor pumping sources (34), and described first is semiconductor pumped
Source and the second semiconductor pumping sources (34) are respectively that first laser gain media (31) and second laser gain media (32) are provided
Gain；
The b units are disposed with the 3rd gain medium (35) along light path, the 4th gain medium (36), nonreciprocal
Mirror (7) is penetrated in element and coupling output；
B units also include the 3rd semiconductor pumping sources (37) and the 4th semiconductor pumping sources (38), and the described 3rd is semiconductor pumped
Source (37) and the 4th semiconductor pumping sources (38) are respectively the 3rd gain medium (35) and the 4th gain medium (36)
Gain is provided；
The emergent light of a units enters b units by 1/2 wave plate；
The pulse laser that pulse seed laser (1) is sent with certain angle by first laser gain media (31), then successively
The adjustable prism that is all-trans (51) in in-position and the adjustable lens group of lens spacing (53), the adjustable prism that is all-trans in the position
(51) it is respectively used to adjust whole ring resonator length and pulse laser mould field size with the adjustable lens group of lens spacing (53)；
Again by second laser gain media (32), the second laser gain media (32) is used to amplify pulsed laser energy；Afterwards
By non-commutative elements, adjust after laser transmission coefficient size, rear level is again by first laser gain media (31), then leads to
Cross 1/2 wave plate to sequentially enter after the 3rd gain medium (35), the 4th gain medium (36), non-commutative elements, again
At a certain angle by the 3rd gain medium (35), last output coupling mirror (7) outgoing.
6. a kind of method based on gain grating compression pulse width and raising energy, it is characterised in that comprise the following steps：
1) make pulse seed laser (1) at a certain angle by the after the phase for the pulse seed laser (1) for adjusting outside injection
One gain medium (31)；
2) whole ring resonator is adjusted by adjusting the light path from the pulse laser of first laser gain media (31) outgoing
After length, then adjust whole ring resonator pulse laser mould field size；
3) pulse laser after control adjustment laser mould field enters second laser gain media (32), amplifies pulsed laser energy；
4) after the laser transmission coefficient of the pulse laser after adjustment amplification, first laser gain media (31) is horizontally entered into again；
5) set-up procedure 4) in first laser gain media (31) outgoing pulse laser phase after, partial pulse laser is anti-
It is emitted back towards in first laser gain media (31) and forms four-wave mixing, utilization space hole-burning effect and beam interference effect produces gain
Grating, realizes pulse compression, output squeezing pulse.
7. the method according to claim 6 based on gain grating compression pulse width and raising energy, it is characterised in that：Pass through
The phase of the pulse seed laser (1) of the outside injection of 1/2 wave plate (21) adjustment；
The light path of pulse laser is adjusted by the adjustable prism that is all-trans (51) in position, and whole ring resonator laser pulse mould field is led to
Cross the adjustable lens group of lens spacing (53) adjustment；
The step 2) be specially：
Pulse laser from first laser gain media (31) outgoing is by the adjustable prism that is all-trans (51) in position, by adjusting position
Putting the light path of the position adjustment laser pulse of the adjustable prism that is all-trans (51), to adjust whole ring resonator long；
The adjustable lens group of lens spacing (53) is reflexed to through the prism that is all-trans (51) again, whole ring is adjusted by adjusting lens spacing
Shape resonator pulse laser mould field size.
8. the method according to claim 7 based on gain grating compression pulse width and raising energy, it is characterised in that：Step
4) the laser transmission coefficient of the pulse laser after amplifying in is adjusted by non-commutative elements, and the non-commutative elements include setting successively
Polarization splitting prism (61), Faraday rotator (62), 1/2 wave plate (24), the polarization splitting prism (63) put.
9. the method according to claim 8 based on gain grating compression pulse width and raising energy, it is characterised in that：Step
5) output coupling mirror (7) reflection and output par, c pulse laser are passed through in；Adjustment is controlled to be all-trans by precision stepper motor (52)
The position of prism (51)；The spacing of lens in adjustment lens group (53) is controlled by precision stepper motor (53).
10. the method according to claim 9 based on gain grating compression pulse width and raising energy, it is characterised in that：Coupling
Step 2 is repeated several times in the partial pulse laser closed in the pulse laser of outgoing mirror (7) reflection) to step 5).
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