CN108832476A - A kind of multiple channel acousto photoreactivation tune Q light source and Q-regulating method - Google Patents
A kind of multiple channel acousto photoreactivation tune Q light source and Q-regulating method Download PDFInfo
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- CN108832476A CN108832476A CN201810677734.1A CN201810677734A CN108832476A CN 108832476 A CN108832476 A CN 108832476A CN 201810677734 A CN201810677734 A CN 201810677734A CN 108832476 A CN108832476 A CN 108832476A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/127—Plural Q-switches
Abstract
The invention belongs to photoelectron and laser technology fields, it is related to a kind of multiple channel acousto photoreactivation tune Q light source and Q-regulating method, including outgoing mirror, the total reflective mirror of outgoing mirror side is set, gain media is arranged between outgoing mirror and total reflective mirror, and acousto-optic modulation module is arranged between outgoing mirror and gain media；There are following advantages for the more traditional acousto-optic Q modulation mode of the present invention：(1) acousto-optic modulation module is greatly improved in the utilization rate of Q-switched laser, is realized and is adjusted Q signal while switch, there is the output of giant-pulse laser.(2) this method is utilized, using the cascade mode of more acousto-optic modulators, the quick multiplication of 2nf (repetition rate that f is acousto-optic modulator) repetition rate may be implemented, meet the requirement of more Gao Zhongying Laser industry processing.(3) for the acousto-optic recombination laser tune Q light source that this method is realized while realizing that single pulse energy is constant, repetition rate is promoted, light-source structure is more compact, strong antijamming capability, and cost performance is higher.
Description
Technical field
The invention belongs to photoelectron and laser technology fields, more particularly, to a kind of multiple channel acousto photoreactivation tune Q light source
And Q-regulating method.
Background technique
The emergence and development of Q-regulating technique are an important breakthroughs in laser developing history.It is by continuous or long pulse
The laser energy of punching is compressed to the extremely narrow pulse of time width and emits output, to realize a kind of high laser of peak power
Pulse modulation technique.Specifically, Q-regulating technique is to change loss of resonator δ by established procedure, is being pumped
When motivating incipient, optical cavity is first made to have high loss state, laser cannot generate laser concussion, make since threshold value is too high
Energy level population, which must be gone up, largely to be accumulated, and when running up to saturation value, cavity loss reduces suddenly, and threshold value also just reduces suddenly,
At this moment reversion population is greatly more than threshold value, and stimulated radiation rapidly enhances at this time.Then energy is largely gone up in a short time
The energy conversion of grade population storage is laser energy, generates a laser giant-pulse output in output end.
Traditional Q-regulating technique mainly uses the methods of acousto-optic Q modulation, electric-optically Q-switched, tilting mirror tune Q.Wherein, acousto-optic Q modulation and electric light
Q-regulating technique has become the mainstream of laser Q-switching laser light source, and be widely applied to Laser industry manufacture field (laser index carving,
Laser ablation, laser roughening etc.), the various fields, especially fortune of the acousto-optic Q modulation technology in high repetition frequency such as laser measurement field
There are apparent advantages in row.The fast development of demand is constantly promoted to processing efficiency however as Laser industry processing, it is existing
Solid state laser acousto-optic Q modulation technology still remain following Railway Project：(1) for traditional laser Q-switching mode, in injection function
Under conditions of rate is constant, as repetition rate increases, the single pulse energy of output can substantially reduce, and be unable to satisfy Q impulse and exist
The technical requirements of high repetition frequency working process parameter.(2) with the raising of laser repetition rate, laser Q-switching device it is electrical
Switching speed can no longer meet the requirement of practical application, it is therefore desirable to seek new control technology.As it can be seen that with Laser industry
The fast development of processing, the demand to the new pattern laser Q-regulating technique of high repetition frequency are also more urgent.
Summary of the invention
The defect of demand and the prior art for practical application, it is an object of the invention to propose a kind of novel sound
The method and related realization scheme of photoreactivation tune Q, it is intended to solve in the prior art while increasing repetition rate, single pulse energy
Measure reduceds technical problem, meet during Laser industry processes, the laser light source constant to high repetitive frequency pulsed energy it is urgent
Demand.
A kind of multiple channel acousto photoreactivation tune Q light source, which is characterized in that including outgoing mirror, the complete of outgoing mirror side is set
Anti- mirror, gain media are arranged between outgoing mirror and total reflective mirror, and acousto-optic modulation module is arranged between outgoing mirror and gain media；
The total reflective mirror includes the first total reflective mirror and the second total reflective mirror, and the outgoing mirror and first total reflective mirror are placed in parallel, with sound
Optical modulator module constitutes first laser resonant cavity, the second total reflective mirror optical axis and positive level-one or negative one grade Bragg diffraction exports
Light direction is overlapped, and constitutes second laser resonant cavity with outgoing mirror harmony optical modulator module.Gain media includes laser gain medium
And laser gain medium, have laser gain medium on the axis of acousto-optic modulation module and the first total reflective mirror, acousto-optic modulation module with
Identical laser gain medium is placed on the axis of second total reflective mirror.
A kind of multiple channel acousto photoreactivation tune Q light source, which is characterized in that including outgoing mirror, the complete of outgoing mirror side is set
Anti- mirror, gain media are arranged between outgoing mirror and total reflective mirror, and acousto-optic modulation module is arranged between outgoing mirror and gain media；
The acousto-optic modulation module is multiple, is the first acousto-optic modulation module respectively, pairs of 1-1 acousto-optic modulation module, 1-2 sound
Optical modulator module；Pairs of 2-1 acousto-optic modulation module, 2-2 acousto-optic modulation module；Pairs of 2-3 acousto-optic modulation module,
2-4 acousto-optic modulation module；……；Pairs of n-th-(2n- 1) acousto-optic modulation module, n-th -2nAcousto-optic modulation module；
The gain media is multiple, is the (n-1)th pairs of laser gain medium, the n-th -2 laser gain medium respectively；In pairs
The n-th -3 laser gain medium, the n-th -4 laser gain medium；……；Pairs of n-th-(2n+1- 1) laser gain medium, n-th-
2n+1Laser gain medium；The total reflective mirror includes the (n-1)th pairs of total reflective mirror, the n-th -2 total reflective mirror；Pairs of n-th -3 is all-trans
Mirror, the n-th -4 total reflective mirror；……；Pairs of n-th-(2n- 1) total reflective mirror, n-th -2nTotal reflective mirror；Wherein n is positive integer；Described n-th-
1 acousto-optic modulation module and the (n-1)th laser gain medium, the n-th -2 laser gain medium constitute the 1st modulation component, the n-th -2 acousto-optic
Modulation module and the n-th -3 laser gain medium, the n-th -4 laser gain medium constitute the 2nd modulation component；……；N-th-(2n)
Acousto-optic modulation module and n-th-(2n+1- 1) laser gain medium, n-th-(2n+1) laser gain medium n-th of modulation component of composition.
In a kind of above-mentioned multiple channel acousto photoreactivation tune Q light source, the outgoing mirror (1) and described n-th -2n+1Total reflective mirror is flat
Row is placed, and with n-th -2nAcousto-optic modulation module, with n-th -2n+1Laser gain medium constitutes first laser resonant cavity；Described
n-(2n+1- 1) total reflective mirror optical axis is overlapped with positive level-one or negative one grade Bragg diffraction output light direction, with outgoing mirror, n-th-(2n +1- 1) laser gain medium and n-th -2nAcousto-optic modulation module composition second laser resonant cavity；……；The (n-1)th total reflective mirror light
Axis and positive level-one or negative one grade Bragg diffraction output light direction are overlapped, with outgoing mirror (1), the (n-1)th laser gain medium and the
N-1 acousto-optic modulation module composition the 2ndn+1Laser resonator.
A method of the compound tune Q of acousto-optic is carried out using multiple channel acousto photoreactivation tune Q light source, which is characterized in that including：
Step 1, when ultrasonic field is added, opened by the second resonant cavity that Bragg diffraction acts on+1 grade of diffraction light direction, 0
First resonant cavity of grade diffraction light direction is in the state closed, and the first resonance cavity loss is big, and endovenous laser gain media is opened
Beginning carries out the accumulation of inverted population.
Step 2 is constantly accumulate to most value Δ N when inverted populationiWhen, the ultrasonic field in acousto-optic modulation module is removed, and
Loss threshold value in one resonant cavity reduces, and the number of photons in resonant cavity quicklys increase, and realizing a pulse width is Δ τp's
The output of Q impulse.
Step 3, acousto-optic modulator are closed to the channel of+1 grade of diffraction light, and the threshold value in the second resonant cavity is got higher at this time, the
Laser gain medium starts to carry out the accumulation of population in two resonant cavities.
Step 4 is accumulate to most value Δ N when the inverted population of laser gain mediumi, ultrasonic signal is beaten in acousto-optic modulator
It opens, acousto-optic modulator is again turned on to the channel of+1 grade of diffraction light, and the threshold value being equivalent in the second resonant cavity at this time reduces, pulse
Width is Δ τpQ impulse exported through outgoing mirror；
Step 5, when the closing period of second switch periods of ultrasonic field, the channel relative to 0 grade of diffraction light is again
It opens, since the loss threshold value in the first resonant cavity reduces suddenly, forming pulse width in 0 grade of diffraction light direction is Δ τpIt is huge
Pulse is exported through outgoing mirror, and get back a ΦmaxGiant-pulse.
Step 6 repeats step 1-5, and ultimately forming repetition rate is the defeated of traditional twice of Q-switched laser of laser pulse
Out, and in the "ON" of acousto-optic tune " Q-switch " and "Off" period, there is high energy pulse output.
There are following advantages for the more traditional acousto-optic Q modulation mode of the present invention：(1) two are realized using a set of acousto-optic modulation module
The laser of road Q impulse exports, and on the basis of single pulse energy is constant, the repetition rate for exporting pulse is improved one times.
(2) acousto-optic modulation module is greatly improved in the utilization rate of Q-switched laser, is realized and is adjusted Q signal while switch, has
The output of giant-pulse laser.(3) this method is utilized, using the cascade mode of more acousto-optic modulators, 2nf may be implemented, and (f is acousto-optic
The repetition rate of modulator) repetition rate quick multiplication, meet more Gao Zhongying Laser industry processing requirement.(4) our
The acousto-optic recombination laser tune Q light source that method is realized is while realizing that single pulse energy is constant, repetition rate is promoted, light-source structure
More compact, strong antijamming capability, cost performance is higher.
Detailed description of the invention
Fig. 1 is the schematic diagram of two channel sound photoreactivation Q-regulating laser sources.
Fig. 2 is two channel sound photoreactivation tune Q working characteristics schematic diagrams and timing diagram.
Fig. 3 is the schematic diagram of the compound Q-regulating laser source of four-way acousto-optic.
Fig. 4 is the compound tune Q working characteristics schematic diagram of four-way acousto-optic and timing diagram.
Fig. 5 is the compound tune Q working characteristics schematic diagram of four-way Gao Zhongying acousto-optic and timing diagram.
Specific embodiment
For the further description present invention, embodiment provides a kind of compact-sized compound tune Q light source of acousto-optic, now ties
Closing drawings and concrete examples, details are as follows：
Embodiment 1：
As shown in Figure 1, the present invention provides a kind of compound laser light source for adjusting Q of compact-sized acousto-optic, specific implementation ginseng
Number includes：The outgoing mirror 1 that transmitance is 5%~60%, the first total reflective mirror 2, the second total reflective mirror 3, the first and second total reflective mirrors can
To be that plane mirror is also possible to concave mirror.Laser gain medium 4 can be Nd:YAG, Yb:YAG, Nd:The standards such as YVO4
Laser material, acousto-optic modulation module 5, including radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), using fused quartz/oxidation
Tellurium is coated with and grows tall antireflective anti-reflection mould to laser wave as acoustic optic interaction medium.The outgoing mirror 1 and described first is all-trans
Mirror 2 is placed in parallel, with acousto-optic modulation module 5 constitute first laser resonant cavity 6, meanwhile, the optical axis 3 of second total reflective mirror with just
Level-one Bragg diffraction exports light direction and is overlapped, and constitutes second laser resonant cavity 7 with 1 harmony optical modulator module 5 of outgoing mirror.Acousto-optic
There is gain working media 4-2 on the axis of modulation module 5 and the first total reflective mirror 2, acousto-optic modulation module 5 and the second total reflective mirror 3
Also there is gain working media 4-1 on axis.
Basic functional principle is described as follows：The radiofrequency signal that frequency is 80MHz is added when extraneous, source driving signal works,
LN PZT (piezoelectric transducer) position realize electricity arrive mechanical movement conversion, when mechanical movement act on fused quartz be material acousto-optic it is mutual
Interaction medium forms the ultrasonic field with " body grating " property.Realize that the condition of Bragg diffraction is as follows：When frequency of sound wave compared with
Height, acoustic optic interaction length L is larger, and between light beam and sound wave corrugated at an angle oblique incidence when, light wave is in the medium
Multiple sound wave faces are passed through, diffraction light at different levels can interfere in medium, and each high level diffraction light will cancel out each other, and only occur 0
Prague of grade and+1 grade (or 0 grade and -1 grade) (depending on incidence angle, this example is assumed to only exist 0 grade and+1 grade of diffraction light) is spread out
It penetrates.Intimate 100% diffraction efficiency can be realized by increasing radio-frequency power.
Therefore, when ultrasonic field is added, along the laser of Bragg angle transmission between 1 harmony optical modulator module 5 of outgoing mirror
Light beam, which deflects into+1 grade of diffraction light direction through the diffraction of acousto-optic modulation module 5, to be continued to propagate, at this time by outgoing mirror 1, acousto-optic
Modulation module 5, gain media 4-1,7 internal loss of the second resonant cavity that the second total reflective mirror 3 is constituted is minimum, and optical path is unimpeded, is excited
The laser pulse of radiation, which is formed, to be vibrated and exports away from outgoing mirror 1.Simultaneously as the work of acousto-optic modulation module 5 is in diffractive shape
State, laser energy are diffracted into completely in the second resonant cavity 7, and the first resonant cavity 6 corresponding to zero-order diffraction light is in high loss
State, laser gain medium 4-2 are now in the state of population accumulation.When in the second resonant cavity 7 giant-pulse formed and it is complete
When at output, the ultrasound in acousto-optic modulation module 5 is quickly removed, and bragg diffraction effect disappears at this time, in 1 harmony of outgoing mirror
Between optical modulator module 5 along Bragg angle transmission laser beam after acousto-optic modulation module 5 will along 0 grade of diffraction light direction after
It resumes and broadcasts, at this point, by outgoing mirror 1, acousto-optic modulation module 5, gain media 4-2, the first resonant cavity that the second total reflective mirror 2 is constituted
6 internal loss become smaller suddenly, and optical path is unimpeded, are accumulated in the inverted population rapid transition of energy level on gain media 4-2, and avalanche type produces
The raw giant-pulse for adjusting Q, and exported away from outgoing mirror 1.At this time since ultrasonic field disappears, the second resonant cavity 7 is in high loss shape
State, laser gain medium 4-2 start to carry out population accumulation.When the giant-pulse in the first resonant cavity 6 is formed and completes output,
Ultrasound in acousto-optic modulation module 5 is loaded quickly, and bragg diffraction effect occurs at this time, by outgoing mirror 1, acousto-optic modulation module
5, gain media 4-1,7 internal loss of the second resonant cavity that the second total reflective mirror 3 is constituted is minimum, and optical path is unimpeded, and stimulated radiation swashs
Light pulse, which is formed, to be vibrated and exports away from outgoing mirror 1.The above process is periodically switched by acousto-optic modulation module 5, control
Laser giant-pulse in the first resonant cavity and the second resonant cavity in constantly generate, the repetition of output Q-switched laser pulse at this time
Frequency is the modulating frequency of twice of acousto-optic modulation module 5.
In the present embodiment, when the ultrasonic field that supersonic frequency is 80MHz is added, Bragg diffraction angle is acquired at this timeλ0=1064nm, η=1, Vs=5960m/s, fs=80MHz obtains θB=7.1mrad, when
When the interaction of acousto-optic Bragg diffraction occurs, being equivalent to the laser beam in resonant cavity deflecting to angle completely is 2 θB+ 1
Grade diffraction light direction, when removing the ultrasonic field of 80MHz, the consumption of acousto-optic bragg diffraction effect, incident beam spreads out along 0 grade at this time
Penetrate light direction transmission.When laser gain medium and total reflective mirror is added in+1 diffraction light and 0 grade of diffraction light exit direction rear end, thus
Constitute the laser resonator of two sets of total chambers.
As shown in Figure 1, for the laser gain medium 4-2 and 4-1 that are placed in the first resonant cavity 6 and the second resonant cavity 7
Effective gain is provided for giant-pulse.Acousto-optic modulation module 5 plays the role of " Q-switch ", when ultrasonic field is added, by Bradley
Second resonant cavity 7 of+1 grade of diffraction light direction of lattice diffraction is opened, and the first resonant cavity 6 of 0 grade of diffraction light direction, which is in, closes
State, 6 internal loss of the first resonant cavity is very big, endovenous laser gain media 4-2 start carry out inverted population accumulation.Such as figure
Shown in 2, inverted population is constantly accumulate to most value Δ NiWhen, the ultrasonic field in acousto-optic modulation module 5 is removed, the first resonant cavity 6
Interior loss threshold value reduces suddenly, and the number of photons in resonant cavity quicklys increase, and realizing a pulse width is Δ τpTune Q arteries and veins
The output of punching.Simultaneously, acousto-optic modulator 5 is closed to the channel of+1 grade of diffraction light, and the threshold value in the second resonant cavity 7 becomes at this time
Height, laser gain medium 4-1 starts to carry out the accumulation of population in the second resonant cavity 7.When the reversion grain of laser gain medium 4-1
Subnumber is accumulate to most value Δ Ni, ultrasonic signal is opened in acousto-optic modulator 5, acousto-optic modulator 5 to the channel of+1 grade of diffraction light again
Secondary unlatching, the threshold value being equivalent in the second resonant cavity 7 at this time reduce, and pulse width is Δ τpQ impulse it is defeated through outgoing mirror 1
Out；When the closing period of second switch periods of ultrasonic field, the channel relative to 0 grade of diffraction light is again turned on, due to chamber 6
Interior loss threshold value reduces suddenly, and forming pulse width in 0 grade of diffraction light direction is Δ τpGiant-pulse, exported through outgoing mirror 1,
Get back a ΦmaxGiant-pulse.Similarly, the above process constantly recycles, and ultimately forms repetition rate and adjusts Q to swash for tradition
The output for the laser pulse that twice of light device, and in the "ON" of acousto-optic tune " Q-switch " and "Off" period, there is high energy pulse defeated
Out.
Embodiment 2：
Using cascade thought, a kind of compact-sized compound Q-regulating laser source of four-way acousto-optic is present embodiments provided,
As shown in Figure 3.Parameter, which is embodied, includes：The outgoing mirror 1 of transmitance 5%~60%, the first total reflective mirror 2, the second total reflective mirror 3,
Third total reflective mirror 8, the 4th total reflective mirror 9, the first, second, third, fourth total reflective mirror can be plane mirror and be also possible to concave reflection
Mirror.Laser gain medium 4 can be Nd:YAG, Yb:YAG, Nd:The laser material of the standards such as YVO4, acousto-optic modulation module 5,
5.1,5.2, including radio-frequency driven power supply, LN crystal make PZT (piezoelectric transducer), using fused quartz/tellurium oxide as acoustic optic interaction be situated between
Matter, and be coated with and grow tall antireflective anti-reflection mould to laser wave.The laser light source structure is as follows：The outgoing mirror 1 and acousto-optic modulation mould
The laser gain medium 4-4 and the 4th total reflective mirror of 0 grade of diffraction light direction of acousto-optic modulator 5.2 on 0 grade of diffraction light direction of block 5
9 constitute the first resonant cavity 6；The outgoing mirror 1 and+1 of acousto-optic modulator 5.2 on 0 grade of diffraction light direction of acousto-optic modulation module 5
The laser gain medium 4-3 and third total reflective mirror 8 of grade diffraction light direction constitute the second resonant cavity 7；The outgoing mirror 1 and acousto-optic tune
The laser gain medium 4-1 and third of 0 grade of diffraction light direction of acousto-optic modulator 5.1 on+1 grade of diffraction light direction of molding block 5
Total reflective mirror 3 constitutes third resonant cavity 10；The outgoing mirror 1 and acousto-optic modulation on+1 grade of diffraction light direction of acousto-optic modulation module 5
The laser gain medium 4-2 and third total reflective mirror 2 of+1 grade of diffraction light direction of device 5.1 constitute the 4th resonant cavity 11；Wherein, acousto-optic
The switch periods of modulation module 5 are T1, (such as T1=200 μ s), the switch periods and acousto-optic tune of acousto-optic modulation module 5.1 and 5.2
Molding block is identical, but duty ratio is different.The duty ratio of acousto-optic modulation module 5 is 1:1, and acousto-optic modulation module 5.1 and 5.2
Duty ratio is 1:3.And acousto-optic modulation module 5 is when loading ultrasound, the load of synchronous 5.1 ultrasound of triggering acousto-optic modulation module, acousto-optic
When modulation module 5 removes ultrasound, the load of synchronous 5.2 ultrasound of triggering acousto-optic modulation module, as shown in Figure 4.
Basic functional principle,
For Fig. 3, acousto-optic modulation module 5 plays the role of the first order " Q-switch ", when acousto-optic modulation module 5.1 and 5.2
To the effect of the second level " Q-switch ".When acousto-optic modulation module 5 loads ultrasound, branch quilt that acousto-optic modulation module 5.1 is controlled
Selection is opened, and the branch that acousto-optic modulation module 5.2 is controlled is by pass section.Laser gain medium 4-3 and laser gain medium at this time
First resonant cavity 7 and the second resonant cavity 6 locating for 4-4 are lost greatly.In this stage, upper laser level particle is constantly being accumulated.
And the state that is worked of the third resonant cavity 10 and the 4th resonant cavity 11 controlled for acousto-optic modulation module 5.1 is by acousto-optic tune
Molding block 5.1 is determined.When acousto-optic modulation module 5.1 loads ultrasonic signal, the 4th resonant cavity 11 is opened, third resonant cavity
10 by pass section, and cavity loss is very big.Laser gain medium 4-1 starts constantly to accumulate upper level inversion population, when reversion grain
Subnumber reaches Δ NiWhen, acousto-optic modulation module 5.1 quickly removes ultrasonic field, and the laser pulse in third resonant cavity 10 is quick at this time
Establishing and forming pulsewidth is Δ τpGiant-pulse from outgoing mirror 1 export.Simultaneously, the laser gain in the 4th resonant cavity 11 is situated between
Matter 4-2 starts the accumulation for carrying out energy level population.
When the laser pulse in third resonant cavity 10 is formed and completes output, the ultrasonic field in acousto-optic modulation module 5 is removed
It removes, also by pass section, laser gain medium 4-1 starts to carry out the accumulation of energy level population third resonant cavity 10.Simultaneously, by
In acousto-optic modulation module 5 and in the opening state of " Q-switch ", the branch that acousto-optic modulation module 5.2 is controlled is strobed.Acousto-optic
The state that the first resonant cavity 6 and the second resonant cavity 7 that modulation module 5.2 is controlled are worked is by sound 5.2 institute of optical modulator module
It determines.When acousto-optic modulation module 5.2 loads ultrasonic signal, the second resonant cavity 7 is opened, and is stored in laser gain medium 4-3
The internal upper rapid transition of level inversion population, forming pulsewidth is Δ τpGiant-pulse from outgoing mirror 1 export.At this point, the
One resonant cavity 6, which is still in, closes section state, and when the ultrasonic signal of acousto-optic modulation module 5.2 is removed, the first resonant cavity 6 is beaten
It opens, the upper rapid transition of level inversion population being stored in inside laser gain medium 4-4, forming pulsewidth is Δ τpHuge arteries and veins
Punching is exported from outgoing mirror 1.And the second resonant cavity 7, by pass section, laser gain medium 4-3 starts to carry out the product of energy level population
It is tired.
After completing the output of pulse in the first resonant cavity 6 and the second resonant cavity 7, acousto-optic modulation module 5 loads super again
Sound, by pass section, corresponding laser gain is situated between the first second resonant cavity of resonant cavity 6 and 47 controlled by acousto-optic modulation module 5.2
Matter 4-3 and laser gain medium 4-3 enters the state of upper level inversion population accumulation；It is controlled by acousto-optic debugging module 5.1
Third resonant cavity 10 and the 4th resonant cavity 11 be again at the state being strobed.Subsequent process constantly repeats, and laser is humorous
Chamber shake in acousto-optic modulation module 5, acousto-optic modulation module 5.1, the first resonant cavity 6, second that acousto-optic modulation module 5.2 is controlled is humorous
Vibration chamber 7, third resonant cavity 10 constantly switch between the 4th resonant cavity 11, realize the laser output of the giant-pulse of high repetition frequency.
Fig. 4 gives the reversion of laser gain medium particle book and output Q-switched arteries and veins in acousto-optic modulation module 5,5.1,5.2 and each resonant cavity
The timing diagram of punching.
By this process, acousto-optic modulator 5 and acousto-optic modulator 5.1,5.2 realize that Prague is spread out because ultrasonic field action is added
It penetrates, one similar acousto-optic " Q-switch " is played the role of in the effect of Bragg diffraction at this time, relative to traditional acousto-optic Q modulation equipment,
The repetition rate of Q-switched laser improves four times.
Further, if the laser gain medium upper level lifetime used in above-described embodiment is shorter such as:Nd:YVO4,
Yb:YVO4, Nd:The laser materials such as YLF, can by improve the repetition rate of acousto-optic modulation 5.2 and acousto-optic modulator 5.3 come into
One step promotes the repetition rate of output Q-switched laser pulse.As shown in figure 5, the switching frequency of such as acousto-optic modulator 5 is f, acousto-optic
The duty ratio of modulation module 5 is 1:1, it can be when the ultrasonic field of acousto-optic modulator 5 loads gating acousto-optic modulator 5.1, at this
Branch road, 5.1 high-speed switch n times of acousto-optic modulator form the pulsed laser output of more high repetition frequency.Similarly, in acousto-optic tune
When the ultrasonic field of device 5 processed is removed, acousto-optic modulator 5.2 is strobed, and in the 5.2 high-speed switch n times of branch acousto-optic modulator, is formed
The pulsed laser output of more high repetition frequency.It can finally form that single pulse energy is constant, repetition rate is the laser Q-switching arteries and veins of 2nf
The output of punching.
Further, if under conditions of keeping single pulse energy constant, the further repetition frequency for promoting output laser
Cascade thought noted earlier, building 2 can also be used in rateNThe recombination laser tune Q mode in a channel, wherein N gives cascade rank
Number.
In conclusion as it will be easily appreciated by one skilled in the art that the foregoing is merely highly preferred embodiment of the present invention,
It is not intended to limit the invention, any modification done within the spirit and principles of the present invention, equivalent replacement and improvement etc.,
It should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of multiple channel acousto photoreactivation tune Q light source, which is characterized in that including outgoing mirror (1), be arranged in outgoing mirror (1) side
Total reflective mirror, gain media is arranged between outgoing mirror (1) and total reflective mirror, acousto-optic modulation module (5) setting in outgoing mirror (1) and
Between gain media；The total reflective mirror includes the first total reflective mirror (2) and the second total reflective mirror (3), the outgoing mirror (1) and described the
One total reflective mirror (2) is placed in parallel, and constitutes first laser resonant cavity (6) with acousto-optic modulation module (5), second total reflective mirror (3)
Optical axis is overlapped with positive level-one or negative one grade Bragg diffraction output light direction, is constituted with outgoing mirror (1) and acousto-optic modulation mould (5) block
Second laser resonant cavity (7)；Gain media includes laser gain medium (4-1) and laser gain medium (4-2), acousto-optic modulation mould
Have laser gain medium (4-1) on block (5) and the axis of the first total reflective mirror (2), acousto-optic modulation module (5) and the second total reflective mirror
(3) identical laser gain medium (4-2) is placed on axis.
2. a kind of multiple channel acousto photoreactivation tune Q light source, which is characterized in that including outgoing mirror (1), be arranged in outgoing mirror (1) side
Total reflective mirror, gain media is arranged between outgoing mirror (1) and total reflective mirror, acousto-optic modulation module (5) setting in outgoing mirror (1) and
Between gain media；The acousto-optic modulation module (5) is multiple, is the first acousto-optic modulation module respectively, pairs of 1-1 acousto-optic
Modulation module, 1-2 acousto-optic modulation module；Pairs of 2-1 acousto-optic modulation module, 2-2 acousto-optic modulation module；Pairs of
2-3 acousto-optic modulation module, 2-4 acousto-optic modulation module；……；Pairs of n-th-(2n- 1) acousto-optic modulation module, n-th -2nAcousto-optic
Modulation module；
The gain media is multiple, is the (n-1)th pairs of laser gain medium, the n-th -2 laser gain medium respectively；Pairs of
N-3 laser gain medium, the n-th -4 laser gain medium；……；Pairs of n-th-(2n+1- 1) laser gain medium, n-th -2n+1
Laser gain medium；The total reflective mirror includes the (n-1)th pairs of total reflective mirror, the n-th -2 total reflective mirror；Pairs of the n-th -3 total reflective mirror,
N-4 total reflective mirror；……；Pairs of n-th-(2n+1- 1) total reflective mirror, n-th -2n+1Total reflective mirror；Wherein n is positive integer；Described (n-1)th
Acousto-optic modulation module and the (n-1)th laser gain medium, the n-th -2 laser gain medium constitute the 1st modulation component, the n-th -2 acousto-optic
Modulation module and the n-th -3 laser gain medium, the n-th -4 laser gain medium constitute the 2nd modulation component；……；N-th-(2n)
Acousto-optic modulation module and n-th-(2n+1- 1) laser gain medium, n-th -2n+1Laser gain medium constitutes n-th of modulation component.
3. a kind of multiple channel acousto photoreactivation tune Q light source according to claim 2, which is characterized in that the outgoing mirror (1) and
Described n-th -2n+1Total reflective mirror is placed in parallel, and with n-th -2nAcousto-optic modulation module, with n-th -2n+1Laser gain medium constitutes the
One laser resonator；Described n-th-(2n+1- 1) total reflective mirror optical axis and positive level-one or negative one grade Bragg diffraction export light direction weight
It closes, with outgoing mirror (1), n-th-(2n+1- 1) laser gain medium and n-th -2nAcousto-optic modulation module composition second laser resonance
Chamber；……；The (n-1)th total reflective mirror optical axis is overlapped with positive level-one or negative one grade Bragg diffraction output light direction, with outgoing mirror
(1), the (n-1)th laser gain medium and the (n-1)th acousto-optic modulation module composition the 2ndn+1Laser resonator.
4. a kind of carry out the compound method for adjusting Q of acousto-optic using multiple channel acousto photoreactivation tune Q light source according to claim 1,
It is characterised in that it includes：
Step 1, when ultrasonic field is added, opened by the second resonant cavity (7) that Bragg diffraction acts on+1 grade of diffraction light direction, 0
The first resonant cavity (6) of grade diffraction light direction is in the state closed, and the first resonant cavity (6) internal loss is big, endovenous laser gain
Medium (4-2) starts to carry out the accumulation of inverted population；
Step 2 is constantly accumulate to most value Δ N when inverted populationiWhen, the ultrasonic field in acousto-optic modulation module (5) is removed, and first
Loss threshold value in resonant cavity (6) reduces, and the number of photons in resonant cavity quicklys increase, and realizing a pulse width is Δ τp's
The output of Q impulse；
Step 3, acousto-optic modulator (5) are closed to the channel of+1 grade of diffraction light, and the threshold value in the second resonant cavity (7) is got higher at this time,
Second resonant cavity (7) interior laser gain medium (4-1) starts to carry out the accumulation of population；
Step 4 is accumulate to most value Δ N when the inverted population of laser gain medium (4-1)i, ultrasound letter in acousto-optic modulator (5)
It number opens, acousto-optic modulator (5) is again turned on to the channel of+1 grade of diffraction light, the threshold being equivalent in the second resonant cavity (7) at this time
Value reduces, and pulse width is △ τpQ impulse through outgoing mirror (1) export；
Step 5, when the closing period of second switch periods of ultrasonic field, the channel relative to 0 grade of diffraction light is again turned on,
Since the loss threshold value in the first resonant cavity (6) reduces suddenly, forming pulse width in 0 grade of diffraction light direction is △ τpHuge arteries and veins
Punching is exported through outgoing mirror (1), and get back a ΦmaxGiant-pulse；
Step 6 repeats step 1-5, ultimately forms the output that repetition rate is traditional twice of Q-switched laser of laser pulse,
And in the "ON" of acousto-optic tune " Q-switch " and "Off" period, there is high energy pulse output.
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