CN107171173A - A kind of new technology that laser mode locking is carried out using intermode beat frequency - Google Patents
A kind of new technology that laser mode locking is carried out using intermode beat frequency Download PDFInfo
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- CN107171173A CN107171173A CN201710347546.8A CN201710347546A CN107171173A CN 107171173 A CN107171173 A CN 107171173A CN 201710347546 A CN201710347546 A CN 201710347546A CN 107171173 A CN107171173 A CN 107171173A
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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
- H01S3/1106—Mode locking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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Abstract
The invention discloses a kind of new technology that laser mode locking is carried out using intermode beat frequency, main method is as follows：Use continuous wave multilongitudianl-mode laser source pumping rare earth doped gain medium, under laserresonator effect, the strong intermode beat effect of pump light synchronous can trigger the periodic modulation of laser power in resonator, by controlling cavity length, the intermode beat frequency rate of accurate matching resonator frequency and pumping source, can set up the stable mode-locking operating of rear-earth-doped laser.Compared with existing active/passive mode-locked laser technology, the advantage of this technology is need not to use any specific mode-locking device, by being combined with rear-earth-doped laser, an alternative with development prospect can be provided for compact conformation, low cost, high performance ultrafast laser source.
Description
Technical field
The invention belongs to laser technology field, more particularly to a kind of laser mode locking technology.
Background technology
Compared with the laser continuously worked, pulse laser can release the energy of resonator memory storage within the extremely short time
Output is put, the peak power ratio continuous laser of output laser is improved several orders of magnitude, can more meet the requirement of practical application.
Particularly optical fiber laser is developed rapidly, has greatly promoted the development of pulse optical fiber recently, is repeated with certain
Frequency, the pulse optical fiber of high-energy have become one of study hotspot of current people.Mode-locking technique is a kind of acquisition
The common technology of pulse laser, by carrying out special modulation to laser, forces each longitudinal mode of vibration chamber in laser
PGC demodulation, makes each mode-coherent superposition obtain the technology of ultrashort pulse.The locked mode of laser be obtain it is shorter (psec or fly
Second-time) pulse one of most effective and preferred technology
Current mode-locking technique is broadly divided into active mode locking, passive mode-locking and the class of mixed mode-locking three.
By outer signals come periodic modulation resonator parameter during active mode locking, phase between each cavity longitudinal mode is realized
A kind of mode-locking technique of locking.Active mode locking laser, which is primarily referred to as entering the modulation device of active or the external world in laser cavity interpolation, to be had
Impulses injection, is modulated to realize locked mode using these active elements to light wave in laser cavity.Active mode locking can be divided into again with
Lower three classes：Mode-locking technique based on modulator, rational number harmonic mode-locking technology, injection type active mode locking technique.Wherein based on tune
The characteristics of device mode-locking technique processed be from chamber it is additional enter radiofrequency signal on the modulator of intracavitary, pass through oscillation light of the signal to cavity
Ripple produces periodic amplitude or phase-modulation, so as to produce mode locking pulse.The major advantage of active mode locking is to produce
The mode locking pulse of high repetition frequency and frequency-tunable, and it is easy to synchronous.Major defect is：Chamber length and refractive index are easily by outer
Boundary's ambient influnence and cause intracavitary off resonance, and the pulse jitter that causes of supermode competition and relaxation oscillation produce it is unstable.It is main
The relevant references of dynamic locked mode have：(1)、《Electrical wavelength-tunable act ively mode-
locked fiber ring laser with a linearly chirped fiber Bragg grating》IEEE
Photonics Technology Letters,10(6)(1998):799-801.》, author：Li Shengping and Chan
T.。
Passive mode-locking is a kind of full optical nonlinear technology, can be in feelings of the intracavitary without any active device of modulator etc
Realize that ultrashort pulse is exported under condition.Its general principle (can be such as satisfied using the nonlinear optical effect in optical fiber or other elements
And sink effect) to the dependence of input pulse intensity, each longitudinal mode PGC demodulation is realized, and then produce ultrashort light pulse.It is used for
Realizing the method for passive mode-locking generally has two kinds：One kind is that saturable absorber is added in resonator, and another is in intracavitary
Properties in nonlinear optical loop mirror (NOLM) or non-linear amplifier fiber annular mirror (NALM) are added, is imitated using the Kerr nonlinearity of optical fiber
High-speed switch, which should be formed, makes laser be in locked mode operating condition；Or by Polarization Control, utilize nonlinear polarization rotation
Produce mode locking pulse.Using passive mode-locking fabrication techniques optical fiber laser because have the advantages that cheap, compact conformation because
And had a wide range of applications in terms of picosecond and femtosecond light source.Due to passive mode-locking produce mode locking pulse repetition rate with
Laser cavity length is inversely proportional, and to realize that passive mode-locking that repetition rate is GHz magnitudes, it is necessary to laser cavity is as short as centimetres, is realized
It is more difficult.Passive mode-locking bibliography：(1)、《Mechanical exfoliat ion of graphene for the
passive mode-locking of fiber lasers》, Applied Physics Letters, 99 (12) (2011):
121107, author：Amos Martinez et al.；(2)、《Nonlinear optical absorption of few-layer
molybdenμm diselenide(MoSe2)for passively mode-locked soliton fiber laser
[Invited]》, Photonics Research 3 (3) (2015):A79-A86, author：Positive money of sieve et al.；(3)、《Soliton
polarization dynamics in fiber lasers passively mode-locked by the nonlinear
polarization rotation technique》, PHYSICAL REVIEW E 74 (2006)：046605, author：J.Wu
Et al..
Mixed mode-locking is exactly the high repetition frequency and stable in combination with several different locked mode mechanism to obtain narrow spaces
Soliton pulse sequence.
However, all these mode-locking techniques are required for specific device (such as acousto-optic modulator for active mode locking
(AOM)), the saturable absorber for the wave plate of nonlinear polarization rotation mirror (NPR) locked mode and for passive mode-locking, may lead
Cause the laser system of complexity or dramatically increasing for cost.And light path system is complicated, unstability factor is more.
The content of the invention
Technical problem underlying to be solved by this invention is to overcome the defect in background technology not need locked mode there is provided one kind
The method that device can just carry out laser mode locking.
In order to solve above-mentioned technical problem, the invention provides a kind of new skill that laser mode locking is carried out using intermode beat frequency
Art, comprises the following steps：
(1) suitable pumping source laser, rare earth doped gain medium and resonator is selected to build rear-earth-doped laser：
According to the optical maser wavelength of desired realization, select to should rare earth doped gain medium Rare Earth Ion optimal absorption wavelength pumping
Source laser device, the optical maser wavelength realized as needed, the mirror device of selection reflection wavelength matching builds resonator；
(2) rare earth doped gain medium is injected in the light source of pumping source laser, is obtained by the gain of rare earth ion
The laser at stimulated radiation wavelength is obtained, and is vibrated in laser cavity, continuous laser is formed；
(3) when pumping source laser works are in many longitudinal mode states, observed from radio frequency output spectrum by intermode beat frequency
The faint fluctuation of periodicity of caused pumping source laser pumping power；
(4) by the optical gain of rare earth ion, pumping source laser pump power caused by intermode beat frequency is fluctuated
Pass to the laser in resonator so that the laser power for mixing rare-earth laser generation produces synchronous week at intermode beat frequency rate
Phase property power swing；
(5) selection pumping source laser beat signal more strong longitudinal-mode beat frequencies frequency is used as beat frequency matching frequency fi,
Meet following chamber frequency matching condition：
fi=N* Δs fsWith Δ fs=c/2nl
Wherein Δ fsIt is resonator longitudinal mode spacing frequency, c is the light velocity, and n is refractive index, and l is that the resonator to be built is long,
N is positive integer；
(6) the long l of resonator is adjusted to tune Δ fs, it is allowed to accurately match the beat frequency matching frequency fi, meet above formula chamber
Frequency matching condition, sets up stable mode-locking state at n times harmonic wave.
In a preferred embodiment：The resonator is one kind in linear cavity, refrative cavity and annular chamber.
In a preferred embodiment：The gain media is rare earth ion doped optical fiber, crystal or ceramics.
In a preferred embodiment：The matrix of the optical fiber is quartz, silicate, phosphate, tellurate, fluoride, sulphur
One kind in compound；Fibre core/cladding structure of the optical fiber is single covering or many cladding structures；
The matrix of the crystal is yttrium-aluminium-garnet (YAG), yttrium lithium fluoride (YLF), yttrium vanadate crystal (YVO4), gadolinium gallium
One kind in garnet (GGG)；
The element of the rare earth ion includes the one or more in neodymium, ytterbium, praseodymium, bismuth, erbium, thulium, holmium.
In a preferred embodiment：The resonator is linear resonator, and it inputs mirror (3), rare earth by high reflection successively
Doping gain media (2), chamber frequency matching block (5), output coupling mirror (4) are constituted.
In a preferred embodiment：The resonator is Z-fold resonator, inputs mirror (3), rare earth by high reflection successively
Adulterate gain media (2), chamber frequency matching block (5), the first speculum (6), the second speculum (7) and output coupling mirror (4) structure
Into；
Wherein rare earth doped gain medium (2) and chamber frequency matching block (5) are arranged on high reflection input mirror (3) and first anti-
Penetrate between mirror (6), between the first speculum (6) and the second speculum (7), between the second speculum (7) and output coupling mirror (4)
In any one or two or three position；The rare earth doped gain medium (2) and chamber frequency matching block of different placement locations
(5) can difference can also be identical.
In a preferred embodiment：The resonator be ring resonator, its successively by input light wavelength division multiplexing (8),
Rare earth doped gain optical fiber (2), Polarization Controller (11), optoisolator (10), output optical coupler (9) and chamber frequency matching block
(5) constitute.
In a preferred embodiment：The high reflection input mirror (3) is reflected with high reflection Fiber Bragg Grating FBG, fiber optic loop
Mirror, high reflection optical thin film medium eyeglass are replaced.
The output coupling mirror (4) uses part reflective fiber Bragg grating, part mirror based fiber optica ring mirror, part reflected light
Thin film dielectrics mirror is learned to replace.
In a preferred embodiment：The chamber frequency matching block (5) is using adjustable length optical fiber, delay line or adjusts defeated
Enter/export mirror spacing to control resonator long.
In a preferred embodiment：The high reflection input mirror (3), the first speculum (6), the second speculum (7), output
Coupling mirror (4) plays a part of wavelength selecting device or filtering device, for controlling in rear-earth-doped laser output laser
Cardiac wave length and output spectrum bandwidth.
For controlling rear-earth-doped laser to export the centre wavelength and output spectrum bandwidth of laser.
In a preferred embodiment：The pumping source laser be multi-longitudinal mode solid laser, many longitudinal-mode fiber-lasers,
One kind in many longitudinal mode semiconductor lasers.
In a preferred embodiment：By adjusting the chamber frequency matching block resonator frequency can be made to match pumping source laser
The different longitudinal-mode beat frequencies frequency of device, so as to change mode-locked laser frequency.
Compared to prior art, technical scheme possesses following beneficial effect：
Intermode beat frequency mode-locking technique is combined by the present invention with rear-earth-doped laser, by adjusting cavity length, is made
Rare earth laserresonator frequency is accurately matched with both intermode beat frequency rates of pumping source, to set up the stable mode-locking of laser.
The operation principle of traditional mode-locked laser is different from, the mode-locked laser based on this technology need not use any specific
Mode-locking device, and can stably produce mode-locked laser pulse.The technology for high performance ultrafast laser source provide one it is very valuable
The alternative of value.
Brief description of the drawings
Fig. 1 is schematic diagram of the invention；
Fig. 2 is the laser device figure that intermode beat frequency mode-locking technique is applied to linear cavity configuration；
Fig. 3 intermode beat frequencies mode-locking technique is applied to the laser device figure of Z-type cavity configuration；
Fig. 4 intermode beat frequencies mode-locking technique is applied to the laser device figure of ring cavity structure；
Fig. 5 intermode beat frequencies mode-locking technique is applied to linear cavity fiber laser and produces 2 μm of mode-locked laser Experimental equipments；
Fig. 6 wavelength is 1565nm pumping source spectrum；
The intermode beat effect for many longitudinal mode pumping sources of 1565nm that Fig. 7 is observed using radio frequency spectrometer；
2 μm of mode-locked laser spectrum that Fig. 8 application intermodes beat frequency technology is produced；
2 μm of mode-locked laser pulse sequences that Fig. 9 application intermodes beat frequency technology is produced；
2 μm of mode-locked laser fundamental frequency frequency spectrums that Figure 10 application intermodes beat frequency technology is produced；
The radio frequency frequency that 2 μm of mode-locked lasers that Figure 11 application intermodes beat frequency technology is produced are observed in the range of 0-300MHz
Spectrum.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
With reference to Fig. 1, a kind of new technology that laser mode locking is carried out using intermode beat frequency is comprised the following steps：
(1) suitable pumping source laser 1, rare earth doped gain medium 2 and resonator is selected to build rear-earth-doped laser
Device, the pumping source laser 1 is in multi-longitudinal mode solid laser, many longitudinal-mode fiber-lasers, many longitudinal mode semiconductor laser
One kind.According to the optical maser wavelength of desired realization, selection is to should the Rare Earth Ion optimal absorption ripple of rare earth doped gain medium 2
Long pumping source laser 1, the optical maser wavelength realized as needed, the mirror device of selection reflection wavelength matching builds resonance
Chamber；
(2) rare earth doped gain medium 2 is injected in the light source of pumping source laser 1, passes through the gain of rare earth ion
The laser at stimulated radiation wavelength is obtained, and is vibrated in laser cavity, continuous laser is formed；
(3) when pumping source laser 1 is operated in many longitudinal mode states, observed from radio frequency output spectrum by intermode beat frequency
The faint fluctuation of periodicity of the caused pump power of pumping source laser 1；
(4) by the optical gain of rare earth ion, the pump power caused by intermode beat frequency of pumping source laser 1 is fluctuated
Pass to the laser in resonator so that the laser power for mixing rare-earth laser generation produces synchronous week at intermode beat frequency rate
Phase property power swing；
(5) selection pumping source laser beat signal more strong longitudinal-mode beat frequencies frequency is used as beat frequency matching frequency fi,
Meet following chamber frequency matching condition：
fi=N* Δs fsWith Δ fs=c/2nl
Wherein Δ fsIt is resonator longitudinal mode spacing frequency, c is the light velocity, and n is refractive index, and l is that the resonator to be built is long,
N is positive integer；
(6) the long l of resonator is adjusted to tune Δ fs, it is allowed to accurately match the beat frequency matching frequency fi, meet above formula chamber
Frequency matching condition, sets up stable mode-locking state at n times harmonic wave.
Wherein, the gain media is rare earth ion doped optical fiber, crystal or ceramics.
The matrix of above-mentioned optical fiber is one kind or many in quartz, silicate, phosphate, tellurate, fluoride, sulfide
Kind；Fibre core/cladding structure of the optical fiber is single covering or many cladding structures；
The matrix of above-mentioned crystal is yttrium-aluminium-garnet (YAG), yttrium lithium fluoride (YLF), yttrium vanadate crystal (YVO4), gadolinium gallium
One kind in garnet (GGG)；
The element of above-mentioned rare earth ion includes one kind in neodymium, ytterbium, praseodymium, bismuth, erbium, thulium, holmium；
As shown in Fig. 2 the resonator is linear resonator, it inputs mirror 3, rare earth doped gain by high reflection successively and is situated between
Matter 2, chamber frequency matching block 5, output coupling mirror 4 are constituted.
As shown in figure 3, the resonator is Z-fold resonator, mirror 3, rare earth doped gain are inputted by high reflection successively
Medium 2, chamber frequency matching block 5, the first speculum 6, the second speculum 7 and output coupling mirror (4) are constituted；In the present embodiment, its
Middle high reflection input mirror 3 is placed with horizontal plane, the first speculum 6 horizontal by an acute angle, the second speculum 7 with
First speculum 6 is parallel；
Wherein rare earth doped gain medium 2 and chamber frequency matching block 5 are arranged on the high reflection input speculum 6 of mirror 3 and first
Between, between the first speculum 6 and the second speculum 7, between the second speculum 7 and output coupling mirror 4 in any one or
Two or three positions；The rare earth doped gain medium 2 and chamber frequency matching block 5 of different placement locations can difference can also phase
Together.
As shown in figure 4, the resonator is ring resonator, it is successively by input light wavelength division multiplexing 8, rear-earth-doped increasing
Beneficial optical fiber 2, Polarization Controller 11, optoisolator 10, output optical coupler 9 and chamber frequency matching block 5 are constituted.
Above-mentioned high reflection input mirror 3 can also use high reflection Fiber Bragg Grating FBG, fiber optic loop speculum, high reflection light
Thin film dielectrics eyeglass is learned to replace；Output coupling mirror 4 can also use part reflective fiber Bragg grating, part mirror based fiber optica ring
Mirror, part reflective optical films dielectric mirror are replaced
The chamber frequency matching block 5 is controlled using adjustable length optical fiber, delay line or regulation input/output mirror spacing
Resonator is long.
The high reflection input mirror 3, the first speculum 6, the second speculum 7, output coupling mirror 4 play wavelength selecting device
Or the effect of filtering device, for controlling rear-earth-doped laser to export the centre wavelength and output spectrum bandwidth of laser.
In a preferred embodiment：By adjusting the chamber frequency matching block resonator frequency can be made to match pumping source laser
The different longitudinal-mode beat frequencies frequency of device 1, so as to change mode-locked laser frequency.
2 μm of intermode beat frequency self mode-locked lasers are set forth below, technology realizes that Experimental equipment is as shown in Figure 5.
This example pumping source uses peak power output for 420mW 1565nm erbiums/ytterbium co-doped double-clad fiber laser
(EY-DCFL) it is 2 μm of laser, to produce wavelength for pumping thulium doped fiber (TDF).1565nm erbiums/ytterbium co-doped double-clad fiber swashs
The gain fibre that light device (EY-DCFL) is used is erbium/ytterbium co-doped double-clad fiber (Nufern-SM-EYDF-7/ that length is 6 meters
130), the absorption coefficient to 976nm pump lights is 2dB/m.
Formation of the intermode beat signal of pump laser to intermode beat frequency locked mode is extremely important, it is therefore necessary to right
The output characteristics of 1565nm pumping sources is studied.
As shown in fig. 6, the centre wavelength of pumping source laser is 1565.06nm, 3-dB line widths are 0.15nm.
As shown in fig. 7, the intermode beat effect for many longitudinal mode pumping sources of 1565nm observed on spectrum analyzer, pumping source
Laser works under continuous optical mode, and radio-frequency probe observes output spectrum in 11.5MHz (f1), 23MHz (f2),
34.5MHz(f3) etc. show peak value at frequency.Because 0.15nm line widths spectrum is substantially made up of 1600 longitudinal modes, so this
A little frequency peaks come from the intermode beat signal of 1565nm lasers.This means the output of 1565nm pumping sources is in these moulds
Between beat frequency (fi) place have more obvious power swing.Choose power relatively strong f3, for being used as intermode beat frequency locked mode
With frequency.f3=34.505MHz.
The rare earth doped gain optical fiber that pumping source laser is selected, is that the high concentration that length is 0.15 meter mixes thulium list cladding light
Fine (Nufern SM-TSF-5/125), the absorption coefficient to 1560nm pump lights is 350dB/m.The linear resonator of 2 mu m all-fibers
Mirror is inputted as high reflection and fiber reflector is constituted as output coupling mirror by Fiber Bragg Grating FBG (FBG).
Fiber Bragg Grating FBG (FBG) has high reflectance (the i.e. T more than 99% near 1980nm<-20dB).Will be certainly
The fiber reflector of system is as outgoing mirror, and outgoing mirror is by S by using plasma sputter deposition systemiO2/Ta2O5Dielectric
Film is coated in what is made on optical fiber ferrule.
Fiber reflector has 96.65% reflectivity (i.e. transmissivity T=3.35%) near 1980nm.
99% power of pumping source laser passes through 99:1 photo-coupler (OC) injects thulium-doped fiber laser intracavitary, remains
1% remaining power is used to monitor in real time.Optimize the working condition of laser using Polarization Controller (PC).
In order to meet chamber frequency matching condition, 33.40 meters of single-mode fiber (Corning SMF- of chamber frequency matching block will be used as
28e+) it is added in resonator.So that the total chamber length of thulium-doped fiber laser resonator reaches 35.55 meters, corresponding to 2.875MHz
Cavity intermode beat note Δ fs。
When pumping source laser power is more than 275mW, laser begins operating in self-locking mode state.
2 μm of mode-locked laser spectrum of output are measured using 1.3-5 μm of Bristol spectrometer (Bristol 721B-IR).
Optical maser wavelength is 1.98 μm.Pulse period through measuring 2 μm of laser is 28.98ns, equal to intermode beat frequency f3Inverse.This understands
Ground shows that intermode beats frequency locked mode mechanism is acted in thulium-doped fiber laser.
When the length for having increased or decreased chamber frequency matching optical fiber.It can be found that the locked mode working condition of 1.98 μm of laser becomes
Obtain unstable or even disappear, this shows that resonator frequency is unsatisfactory for matching condition.These results further confirm, only when
During the length of accurate selection chamber frequency matching optical fiber, intermode beat frequency Mould locking machine system could work in thulium-doped fiber laser.
Fig. 8 gives 2 μm of mode-locked laser spectrum in 1970nm-1990nm close limits.Centre wavelength is 1980.35nm, 3-
DB spectral bandwidths (Δ ε) are about 0.3nm, and spectrometer resolution ratio is 0.1nm.
Fig. 9 gives 2 μm of locked mode pulses.It is obvious that the quasi-square wave shape that width is 15ns is presented in pulse.
Figure 10 gives the radio frequency output spectrum of 2 μm of Mode-locked lasers of intermode beat frequency mode-locking technique generation, fundamental frequency peak
It is 34.496MHz, the intermode beat frequency f with 1565nm pumping sources to be worth (pulse recurrence frequency)3Match, and accurately with mixing thulium
Resonant cavity of fibre-optical laser frequency (fs=2.875MHz) the 12nd order harmonicses it is consistent.Mode-locked pulse signal signal to noise ratio (SNR) is big
In 61dB, the mode-locked laser SNR that can be produced with the passive mode-locking fiber laser using saturable absorber is comparable.
Figure 11 is the radio spectrum in 0-300MHz relative broad ranges.There are 11 weak rf frequencies between two strong adjacent peak
Peak, it was demonstrated that what laser was produced is the 12nd order harmonicses locked mode.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (12)
1. a kind of new technology that laser mode locking is carried out using intermode beat frequency, it is characterised in that comprise the following steps：
(1) suitable pumping source laser, rare earth doped gain medium and resonator is selected to build rear-earth-doped laser：According to
Want realize optical maser wavelength, select to should rare earth doped gain medium Rare Earth Ion optimal absorption wavelength pumping source swash
Light device, the optical maser wavelength realized as needed, the mirror device of selection reflection wavelength matching builds resonator；
(2) inject the rare earth doped gain medium in the light source of pumping source laser, by the gain of rare earth ion obtain by
Swash the laser of radiated wave strong point, and vibrated in laser cavity, form continuous laser；
(3) when pumping source laser works are in many longitudinal mode states, observe and caused by intermode beat frequency from radio frequency output spectrum
Pumping source laser pumping power the faint fluctuation of periodicity；
(4) by the optical gain of rare earth ion, by pumping source laser pump power Wave transmission caused by intermode beat frequency
To the laser in resonator so that the laser power for mixing rare-earth laser generation produces property synchronizing cycle at intermode beat frequency rate
Power swing；
(5) selection pumping source laser beat signal more strong longitudinal-mode beat frequencies frequency is used as beat frequency matching frequency fi, under satisfaction
The chamber frequency matching condition in face：
fi=N* Δs fsWith Δ fs=c/2nl
Wherein Δ fsIt is resonator longitudinal mode spacing frequency, c is the light velocity, and n is refractive index, and l is that the resonator to be built is long, N is just
Integer；
(6) the long l of resonator is adjusted to tune Δ fs, it is allowed to accurately match the beat frequency matching frequency fi, meet above formula chamber frequency
With condition, stable mode-locking state is set up at n times harmonic wave.
2. a kind of new technology that laser mode locking is carried out using intermode beat frequency according to claim 1, it is characterised in that：It is described
Resonator is one kind in linear cavity, refrative cavity and annular chamber.
3. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 2, it is characterised in that：It is described to increase
Beneficial medium is rare earth ion doped optical fiber, crystal or ceramics.
4. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 3, it is characterised in that：The light
Fine matrix is one kind in quartz, silicate, phosphate, tellurate, fluoride, sulfide；Fibre core/covering of the optical fiber
Structure is single covering or many cladding structures；
The matrix of the crystal is yttrium-aluminium-garnet (YAG), yttrium lithium fluoride (YLF), yttrium vanadate crystal (YVO4), gadolinium gallium pomegranate
One kind in stone (GGG)；
The element of the rare earth ion includes the one or more in neodymium, ytterbium, praseodymium, bismuth, erbium, thulium, holmium.
5. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 2, it is characterised in that：It is described humorous
The chamber that shakes be linear resonator, its successively by high reflection input mirror (3), rare earth doped gain medium (2), chamber frequency matching block (5),
Output coupling mirror (4) is constituted.
6. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 2, it is characterised in that：It is described humorous
The chamber that shakes is Z-fold resonator, inputs mirror (3), rare earth doped gain medium (2), chamber frequency matching block by high reflection successively
(5), the first speculum (6), the second speculum (7) and output coupling mirror (4) are constituted；
Wherein rare earth doped gain medium (2) and chamber frequency matching block (5) are arranged on high reflection input mirror (3) and the first speculum
(6) between, between the first speculum (6) and the second speculum (7), between the second speculum (7) and output coupling mirror (4)
Any one or two or three position；The rare earth doped gain medium (2) and chamber frequency matching block (5) of different placement locations can
Can also be identical with difference.
7. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 2, it is characterised in that：It is described humorous
The chamber that shakes is ring resonator, and it is successively by input light wavelength division multiplexing (8), rare earth doped gain optical fiber (2), Polarization Controller
(11), optoisolator (10), output optical coupler (9) and chamber frequency matching block (5) are constituted.
8. a kind of new technology that laser mode locking is carried out using intermode beat frequency as described in claim 5 or 6, it is characterised in that：
The high reflection input mirror (3) uses high reflection Fiber Bragg Grating FBG, fiber optic loop speculum, high reflection optical thin film medium
Eyeglass is replaced；
The output coupling mirror (4) with part reflective fiber Bragg grating, part mirror based fiber optica ring mirror, partly reflect optically thin
Film medium mirror is replaced.
9. a kind of new technology that laser mode locking is carried out using intermode beat frequency as described in claim 5 or 6 or 7, it is characterised in that：
The chamber frequency matching block (5) controls resonator using adjustable length optical fiber, delay line or regulation input/output mirror spacing
Chamber is long.
10. a kind of new technology that laser mode locking is carried out using intermode beat frequency as described in claim 5 or 6, it is characterised in that：Institute
State high reflection input mirror (3), the first speculum (6), the second speculum (7), output coupling mirror (4) play wavelength selecting device or
The effect of filtering device, for controlling rear-earth-doped laser to export the centre wavelength and output spectrum bandwidth of laser.
11. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 1, it is characterised in that：It is described
Pumping source laser is one kind in multi-longitudinal mode solid laser, many longitudinal-mode fiber-lasers, many longitudinal mode semiconductor lasers.
12. a kind of new technology that laser mode locking is carried out using intermode beat frequency as claimed in claim 9, it is characterised in that：It can lead to
Overregulating the chamber frequency matching block makes resonator frequency match the different longitudinal-mode beat frequencies frequency of pumping source laser, so as to change
Mode-locked laser frequency.
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| CN109030493A (en) * | 2018-06-08 | 2018-12-18 | 西安电子科技大学 | A kind of sapphire mirror detecting method for searching for flaw maximum relation degree |
| CN110783809A (en) * | 2019-11-26 | 2020-02-11 | 济南大学 | Device for slowing down walk-off thermal effect of high-power pulse optical parametric oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109030493A (en) * | 2018-06-08 | 2018-12-18 | 西安电子科技大学 | A kind of sapphire mirror detecting method for searching for flaw maximum relation degree |
| CN110783809A (en) * | 2019-11-26 | 2020-02-11 | 济南大学 | Device for slowing down walk-off thermal effect of high-power pulse optical parametric oscillator |
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