CN107275915B - A kind of Erbium doped fiber femtosecond laser based on 8 word chamber mode locking of mixed type - Google Patents
A kind of Erbium doped fiber femtosecond laser based on 8 word chamber mode locking of mixed type Download PDFInfo
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- CN107275915B CN107275915B CN201710284832.4A CN201710284832A CN107275915B CN 107275915 B CN107275915 B CN 107275915B CN 201710284832 A CN201710284832 A CN 201710284832A CN 107275915 B CN107275915 B CN 107275915B
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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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
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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
- H01S3/10061—Polarization control
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/107—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using electro-optic devices, e.g. exhibiting Pockels or Kerr effect
Abstract
The present invention provides a kind of Erbium doped fiber femtosecond lasers based on 8 word chamber mode locking of mixed type, the output of interferometric loop enters optical fiber collimator one by four port beam splitters, the emergent ray of optical fiber collimator one is successively via Polarization Control Module one, Electro-optical Modulation crystal, spatial light isolator and Polarization Control Module two, incident optical collimator two；Laser mirror adjusts position under the driving of piezoelectric ceramic actuator, the laser of the Electro-optical Modulation crystal outgoing laser that incident spatial light isolator or Polarization Control Module one are emitted after being reflected by laser mirror again passes by the incident spatial light isolator of Polarization Control Module one after being reflected by laser mirror.The present invention can be realized high repetition frequency, the mode-locked laser pulse output of dispersion management mechanism makes it have while reducing Erbium doped fiber femtosecond laser system noise and opens lock function automatically, and improve the environmental suitability and longitudinal mode spacing of femto-second laser.
Description
Technical field
The invention belongs to ultrafast Fiber laser technology fields, are related to a kind of femto-second laser.
Background technique
At the end of the nineties in last century, the appearance of optical frequency com becomes one of most revolutionary scientific research progress, high
The Frequency transfer of resolution ratio, the comb teeth frequency of pinpoint accuracy and high stability is optical frequency measurement, optical frequency transmitting, precision
The Related Research Domains such as spectral investigation bring major transformation.Femto-second laser is the core synthesizer part of optical frequency com,
Time domain output is the ultra-narrow laser pulse sequence with certain time interval, is the frequency with certain frequency interval on frequency domain
Comb teeth.The performance of femto-second laser is directly related with the performance indicator of optical frequency com, reliability: on the one hand, femto-second laser
Intensity and phase noise level determine the stiffness of system of optical frequency com；On the other hand, the reliability of optical frequency com
(environmental suitability) is primarily limited to the environmental sensibility of femto-second laser.For optical frequency com in Precise physical measurement and phase
The application study demand in pass field, increase femto-second laser longitudinal mode spacing, reduce femto-second laser system noise levels with
And improving the system reliability of femto-second laser is researcher's important research content of interest.
The system that optical frequency com is initially mainly based upon Ti:Sapphire laser solid-state femto-second laser, ti:sapphire laser femto-second laser tool
Have the advantages that noise is low and can generate high repetition frequency comb teeth, but its system is huge, maintenance cost is high, and system environments
Adaptability is poor, is not able to satisfy the demand of various application fields.In recent years, with the progress of Fiber laser technology, optical-fiber laser
The research of device achieves rapid development, and the optical frequency com system based on ultrashort pulse fiber laser building is due to compact
Change the characteristics such as structure, higher transformation efficiency and operating steady in a long-term, is widely used to numerous Applied research fields, wherein
It is the most typical with the application study of Erbium doped fiber femtosecond laser.
It the use of more mode-locking technique include saturable absorber mode locking, nonlinear polarization in Erbium doped fiber femtosecond laser
Mode locking and nonlinear optical fiber amplification annular mirror mode locking etc. are rotated, these mode-locking techniques are to output mode locking pulse characteristic and laser system
Parameter of uniting has strong influence.In the femto-second laser based on saturable absorber mode locking, saturable absorber, which has, is partly led
Several different materials such as body saturated absorption mirror (SESAM), graphene and carbon nanotube.Due to these above-mentioned saturable absorbers
All there is slow saturated absorption characteristic, make the output pulse of this kind of laser often in picosecond magnitude, and be based on saturable absorption
The laser noise level of body mode locking mechanism is higher.In addition, excessively high pump power can puncture and damage saturable absorber material
Material, limits the output power and pulse energy of this kind of laser.Femtosecond laser based on nonlinear polarization rotation mode locking mechanism
Device is to realize mode locking by generating nonlinear phase shift relevant to luminous intensity in a fiber, and by the selection of polarization state, is passed through
Dispersion management is carried out to optics cavity, the pulse output of tens femtosecond magnitudes may be implemented, such laser General System noise is low
Noise.But the mode-lock status due to such laser and laser polarization state are close, environment temperature changes, vibration and optical fiber are curved
Song change etc. can all cause the variation even losing lock of mode-lock status.In addition, such laser needs the adjusting by polarizer,
Mode-lock status is found, does not open lock function certainly.Femto-second laser based on nonlinear amplified loop mirror mode locking generally uses all risk insurance
Inclined fiber design has high reliablity, miniaturization and easily practical advantage.And by the way that phase-modulation is added in optics cavity
Device so that such laser has from opening lock function, but due to the difficulty of intra-cavity dispersion management so that the noise level of system compared with
It is high.In addition, the characteristics of due to such this body structure of laser, it is difficult to obtain the femto-second laser of high repetition frequency.
Therefore, increase femto-second laser in Precise physical measurement and the application demand of related fields for optical frequency com
Longitudinal mode spacing, reduce femto-second laser system noise levels and improve femto-second laser system reliability be researcher
Important research content of interest.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of Er-doped fiber for being based on mixed type " 8 " word chamber mode locking
Femto-second laser device, the laser source suitable for femtosecond frequency comb.Erbium doped fiber femtosecond laser designed by the present invention uses
Optical fiber and Space Coupling formula mould-locking structure, joint amplify two kinds of mode lockings of annular mirror using nonlinear polarization rotation and nonlinear optical fiber
Mechanism may be implemented the mode-locked laser pulse output of high repetition frequency, dispersion management mechanism, reduce Erbium doped fiber femtosecond laser
While system noise, makes it have and open lock function automatically, and improve between the environmental suitability of femto-second laser and longitudinal mode
Every.
The technical solution adopted by the present invention to solve the technical problems is: one kind being based on 8 word chamber mode locking er-doped light of mixed type
Fine femto-second laser device, including four port beam splitters, main oscillations loop and interferometric loop；Four port beam splitters are as main oscillations
The interface unit of loop and interferometric loop, two ports are connected with main oscillations loop, another two port and interferometric loop both ends phase
Even, as the input and output port of interferometric loop, guarantee by the laser of main oscillations loop along interferometric loop bi-directional；It is described
Interferometric loop be nonlinear amplification annular hysteroscope optical path, the optical path be all -fiber optical path；The main oscillations loop includes two
A Polarization Control Module, Electro-optical Modulation crystal, laser mirror, piezoelectric ceramic actuator, spatial light isolator and two optical fiber
The output of collimator, interferometric loop enters optical fiber collimator one, the emergent ray of optical fiber collimator one by four port beam splitters
Successively via Polarization Control Module one, Electro-optical Modulation crystal, spatial light isolator and Polarization Control Module two, incident optical collimation
Device two；Laser mirror adjusts position under the driving of piezoelectric ceramic actuator, and the laser of Electro-optical Modulation crystal outgoing is by laser
After incident spatial light isolator or the laser of the outgoing of Polarization Control Module one are reflected by laser mirror after reflecting mirror reflection again
By the incident spatial light isolator of Polarization Control Module one；The spatial light isolator guarantees that laser is single in main oscillations loop
To transmission；The Electro-optical Modulation crystal as quick optical modulation element, refractive index size with the variation of on-load voltage and
Change, and then quickly changes the optical path length of main oscillations loop；The piezoelectric ceramic actuator controls its length by driving voltage
Degree is flexible, for changing the optical path length of main oscillations loop on a large scale.
The interferometric loop includes Polarization Controller, er-doped gain fibre and wavelength division multiplexer, is sequentially connected in series at four ends
Between two ports of mouth beam splitter；The Polarization Controller passes through the gain fibre or ordinary optic fibre of clamping interferometric loop,
The polarization for changing laser in interferometric loop, realizes Er-doped fiber femtosecond laser with the polarization control component in main oscillations loop simultaneously
The starting and maintenance of device；Incident pumping laser is transmitted to er-doped gain fibre and generates laser by the wavelength division multiplexer；Institute
It is connected by single mode optical fiber between Polarization Controller, er-doped gain fibre and the wavelength division multiplexer stated.
In the main oscillations loop, Polarization Control Module one includes polarizer and polarization splitting prism；Laser passes through
After polarizer is adjusted, it is transmitted to polarization splitting prism and carries out polarization beam splitting, the laser of vertical polarization is as laser of the invention
Output, horizontal polarization laser are transmitted to Electro-optical Modulation crystal；The polarizer is quarter-wave plate, half-wave plate, electric light
One of light polarization modulator and magneto-optic polarization rotator concatenate several.
In the main oscillations loop, Polarization Control Module one includes polarizer and polarization splitting prism；Laser passes through
After polarizer is adjusted, it is transmitted to polarization splitting prism and carries out polarization beam splitting, the laser of horizontal polarization is as laser of the invention
Output, vertical polarization laser are transmitted to Electro-optical Modulation crystal by polarizer；The polarizer be quarter-wave plate,
Two kinds of one of half-wave plate, electric light light polarization modulator and magneto-optic polarization rotator or concatenation.
In the main oscillations loop, Polarization Control Module two is quarter-wave plate, half-wave plate, electric light light polarization modulator
With two kinds of one of magneto-optic polarization rotator or concatenation.
The beneficial effects of the present invention are: due to " 8 " word chamber mould-locking structure using optical fiber and Space Coupling formula, the structure knot
The characteristics of closing two mode locking principles of nonlinear polarization rotation mode locking and nonlinear amplified loop mirror realizes high repetition frequency, dispersion
The mode-locked laser pulse of administrative mechanism exports, and improves the longitudinal mode spacing of optimal frequency domain；Simultaneously in Erbium doped fiber femtosecond laser
The modulation devices such as Electro-optical Modulation crystal and piezoelectric ceramic actuator are added in optics cavity, are Er-doped fiber femtosecond laser frequency comb weight
Complex frequency high bandwidth, large-scale feedback control provide condition, and light comb is made to have superhigh precision (second surely reaches E-16) frequency control
Ability processed；Meanwhile entire Erbium doped fiber femtosecond laser device has compact-sized, adjusting and encapsulation is simple and longtime running is steady
The features such as determining.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention, wherein (a) is structure A, (b) is structure B；
Fig. 2 is one structural schematic diagram of interior Polarization Controller of the embodiment of the present invention；
Fig. 3 is two structural schematic diagram of interior Polarization Controller of the embodiment of the present invention；
In figure, 1- fiber optic splitter；2- optical fiber collimator；3- Polarization Control Module 1；4- Electro-optical Modulation crystal；5- laser
Reflecting mirror；6- piezoelectric ceramic actuator；7- spatial light isolator；8- Polarization Control Module 2；9- wavelength division multiplexer；10- er-doped increases
Beneficial optical fiber；11- Polarization Controller；12- pump laser source；Wave plate or quarter wave plate；14- polarization splitting prism；15-1/4
Wave plate-electric light light polarization modulator or magneto-optic polarization rotator.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
The present invention provides a kind of femto-second laser as optical frequency com laser source, which is a kind of based on non-thread
Property polarization rotation and two kinds of mode locking mechanism of nonlinear amplified loop mirror mixed type " 8 " word chamber femto-second laser.
Based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser device, including four port beam splitters, main oscillations ring
Road and interferometric loop.Interface unit of four port beam splitters as main oscillations loop and interferometric loop；Interferometric loop is an allusion quotation
The nonlinear amplification annular hysteroscope optical path of type, the optical path are all -fiber optical path；Main oscillations loop is by optic fibre light path and space optical path
Two parts composition, wherein space optical path includes laser polarization regulating element, laser output element, repetition rate control element, protects
Demonstrate,prove the composition such as coupling element between the optical path one direction isolation element passed through and space and optical fiber.
It is described as a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser based on mixed type " 8 " word chamber mode locking
8-shaped cavity configuration mode locking Erbium doped fiber femtosecond laser main oscillations loop in, include spatial light in optic fibre light path every
From device or the isolation element being made of the polarizer, Faraday polarization apparatus and analyzer, to guarantee that laser is single in main oscillations loop
To transmission.
As a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser device based on mixed type " 8 " word chamber mode locking,
In the main oscillations loop of the Erbium doped fiber femtosecond laser, space optical path part includes half-wave plate, quarter-wave plate
And the polarization control components such as polarization splitting prism are several.The polarization control component polarization splitting prism is used as er-doped light simultaneously
The output element of fine femto-second laser is combined by one group of polarization control component that half-wave plate and quarter-wave plate form and is placed in light
The polarization control component combination of fine coupler and polarization splitting prism incidence end, another group of half-wave plate and quarter-wave plate composition
It is placed between the transmission end of polarization splitting prism and another fiber coupler.The purpose of polarization control component is to start and maintain
The mode-lock status of er-doped femto-second laser.
As a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser device based on mixed type " 8 " word chamber mode locking,
It also include Electro-optical Modulation crystal and piezoelectricity pottery in the main oscillations loop of the Erbium doped fiber femtosecond laser, in space optical path
Porcelain driver, wherein Electro-optical Modulation crystal is placed in the transmission end of polarization splitting prism in space optical path, as quick optical modulating element
Part, refractive index size change with the variation of on-load voltage, and then quickly change the optical path length of main oscillations loop；Piezoelectricity
Ceramic driver is placed in the reflection arm of main oscillations loop, as at a slow speed, long-range compensating element, length it is flexible by driving electricity
Voltage-controlled system, for changing the optical path length of main oscillations loop on a large scale；Electro-optical Modulation crystal and piezoelectric ceramic actuator are made simultaneously
For the feedback element of laser repetition rate locking.
As a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser device based on mixed type " 8 " word chamber mode locking,
The interferometric loop of the optical fiber femtosecond laser, mainly by fiber optic splitter, wavelength division multiplexer, general single mode fiber and er-doped
Gain fibre is constituted.Wherein interface unit of the fiber optic splitter as main oscillations loop and interferometric loop, two of them port with
Main oscillations loop is connected, and another two port is connected with interferometric loop both ends, as the input and output port of interferometric loop, guarantees
By main oscillations loop laser along interferometric loop bi-directional.
As a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser device based on mixed type " 8 " word chamber mode locking,
In the interferometric loop of the Erbium doped fiber femtosecond laser, also includes the Polarization Controller of mechanical or electric adjustable type, pass through
Clamp interferometric loop gain fibre or ordinary optic fibre, change interferometric loop in laser polarization, the purpose is to main oscillations ring
Polarization control component in road realizes the starting and maintenance of Erbium doped fiber femtosecond laser simultaneously.
As a kind of preferred embodiment of the above-mentioned Erbium doped fiber femtosecond laser device based on mixed type " 8 " word chamber mode locking,
The interferometric loop of the Erbium doped fiber femtosecond laser also has the characteristics that dispersion management, and selected er-doped gain fibre is not only
Required energy is provided for laser system, it is also required to provide normal dispersion in communication band, and general single mode fiber is communicating
Wave band provides anomalous dispersion；By the matching of length between er-doped gain fibre and general single mode fiber, Er-doped fiber femtosecond is realized
The inner cavity dispersion management of laser.
For the overall structure of the embodiment of the present invention as shown in Figure 1, being divided into two kinds of structures of structure A and structure B, both structures are big
It causes identical, is largely divided into main oscillations loop and interferometric loop, wherein main oscillations loop is made of fiber section and space segment,
Fiber section is that fiber optic splitter 1 and optical fiber collimator 2 are constituted, and the beam splitting ratio representative value of fiber optic splitter 1 is 50:50.Light
The output light of fine collimator 2 is directly transmitted to Polarization Control Module 1, and the laser through Polarization Control Module 1 is transmitted to electric light
It after modulation crystal 4, is reflected by laser mirror 5,5 sticker of laser mirror is on piezoelectric ceramic actuator 6.After reflection
Laser is direct or again passes by Polarization Control Module 1 into spatial light isolator 7, it is ensured that laser is unidirectional in main oscillations loop
Transmission, and enter in Polarization Control Module 28.Optical fiber collimator 2 is transmitted to by the laser of Polarization Control Module 28 and is returned
To at fiber optic splitter 1, the main oscillations ring of the Erbium doped fiber femtosecond laser based on mixed type " 8 " word chamber mode locking is constituted with this
Road.
In main oscillations loop, the typical structure of Polarization Control Module 1 can have the following two kinds form, respectively such as Fig. 2
Structure C and D shown in, wherein structure C is mainly used in the Erbium doped fiber femtosecond laser based on mixed type " 8 " word chamber mode locking
In structure A, and structure D is then applied in the structure B based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser；First
By taking structure C as an example, laser is by half-wave plate or quarter-wave plate 13 or quarter-wave plate, half-wave plate, electric light Polarization Modulation
After the polarizers such as device or magneto-optic polarization rotator 15 are adjusted, it is transmitted to polarization splitting prism 14 and carries out polarization beam splitting, it is vertical inclined
The laser of vibration is exported as the laser based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser, horizontal polarization laser
Transport to subsequent element；And in structure D, the horizontal polarization laser of polarization splitting prism 14, which is used as, is based on mixed type " 8 " word chamber mode locking
The laser of Erbium doped fiber femtosecond laser exports, and the laser of vertical polarization is transmitted to subsequent element.Polarization Control Module 28 can also
To be divided into two kinds of typical structures, it both may include the structure of monolithic half-wave plate or quarter-wave plate 13, can also reuse
The polarization adjustment elements 15 such as quarter-wave plate, half-wave plate, electric light light polarization modulator or magneto-optic polarization rotator carry out laser
Polarization is adjusted twice
Interferometric loop based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser is optic fibre light path (such as Fig. 1 institute
Show), the loop successively by fiber optic splitter 1, wavelength division multiplexer 9, er-doped gain fibre 10 and the head and the tail of Polarization Controller 11 sequentially
It is formed by connecting, the effect of wavelength division multiplexer 9 is will to pump the pumping laser that femto-second laser 12 exports to be transmitted to er-doped gain light
Fibre 10 is realized population inversion and generates laser, entirely to be mentioned based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser
For energy.The effect of Polarization Controller 11 be in main oscillations loop Polarization Control Module 1 and Polarization Control Module 28 it is same
When control laser polarization state, realize and maintain the mode locking of 8-shaped cavity configuration.The connection optical fiber of the above element is all to provide negative color
Scattered general single mode fiber, and er-doped gain fibre 10 then provides positive dispersion, passes through matching general single mode fiber and er-doped gain
The length of optical fiber 10 optimizes the inner cavity net dispersion based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser, makes inner cavity
For solid color scattered amount close to zero, the mechanism of this dispersion management can effectively inhibit the phase noise of optical frequency com.
It can be obtained according to experiment, by the Polarization Control Module for being based on mixed type " 8 " word chamber mode locking Erbium doped fiber femtosecond laser
The laser of one 3 outputs, the general single pulse energy with 0.3nJ, direct output pulse width are less than 100fs, output light spectrum width
Degree is greater than 40nm, and output laser is transmitted to beam splitting in laser beam splitter 1, realizes multi-channel laser output.Wherein laser beam splitter 1 can
It is realized with using laser part reflecting mirror to build space optical path, the laser beam splitter of optical fiber structure also can be used；General beam splitting
Optical path is more than or equal to two-way, and beam splitting ratio presses required proportion adjustment.
Claims (5)
1. a kind of Erbium doped fiber femtosecond laser based on 8 word chamber mode locking of mixed type, including four port beam splitters, main oscillations loop
And interferometric loop, it is characterised in that: interface unit of four port beam splitters as main oscillations loop and interferometric loop, two ports
It is connected with main oscillations loop, another two port is connected with interferometric loop both ends, as the input and output port of interferometric loop, protects
Card is by the laser of main oscillations loop along interferometric loop bi-directional；The interferometric loop is nonlinear amplification annular hysteroscope light
Road, the optical path are all -fiber optical path；The main oscillations loop includes Electro-optical Modulation crystal, laser mirror, piezoelectric ceramics drive
The output of dynamic device, spatial light isolator and two Polarization Control Modules and two optical fiber collimators, interferometric loop passes through four ends
Mouth beam splitter enters optical fiber collimator one, and the emergent ray of optical fiber collimator one is successively via Polarization Control Module one, electric light tune
Combinations body, spatial light isolator and Polarization Control Module two, incident optical collimator two；Laser mirror is in Piezoelectric Ceramic
Position is adjusted under the driving of device, incidence spatial light isolator after the laser of Electro-optical Modulation crystal outgoing is reflected by laser mirror,
Or the laser that is emitted of Polarization Control Module one reflected by laser mirror after again pass by the incident spatial light of Polarization Control Module one
Isolator；The spatial light isolator guarantees laser one-way transmission in main oscillations loop；The Electro-optical Modulation crystal is made
For quick optical modulation element, refractive index size changes with the variation of on-load voltage, and then quickly changes main oscillations loop
Optical path length；The piezoelectric ceramic actuator controls its telescopic by driving voltage, for changing main oscillations loop
Optical path length.
2. the Erbium doped fiber femtosecond laser according to claim 1 based on 8 word chamber mode locking of mixed type, it is characterised in that:
The interferometric loop includes Polarization Controller, er-doped gain fibre and wavelength division multiplexer, is sequentially connected in series in four port beam splitters
Two ports between；The Polarization Controller changes interference by the gain fibre or ordinary optic fibre of clamping interferometric loop
Polarization control component in loop in the polarization of laser, with main oscillations loop realizes the starting of Erbium doped fiber femtosecond laser simultaneously
And maintenance；Incident pumping laser is transmitted to er-doped gain fibre and generates laser by the wavelength division multiplexer；The polarization
It is connected by single mode optical fiber between controller, er-doped gain fibre and wavelength division multiplexer.
3. the Erbium doped fiber femtosecond laser according to claim 1 based on 8 word chamber mode locking of mixed type, it is characterised in that:
In the main oscillations loop, Polarization Control Module one includes polarizer and polarization splitting prism；Laser passes through polarizer
After adjusting, it is transmitted to polarization splitting prism and carries out polarization beam splitting, the laser of vertical polarization is as based on 8 word chamber mode locking of mixed type
The laser of Erbium doped fiber femtosecond laser exports, and horizontal polarization laser is transmitted to Electro-optical Modulation crystal；The polarizer is
One of quarter-wave plate, half-wave plate, electric light light polarization modulator and magneto-optic polarization rotator concatenate several.
4. the Erbium doped fiber femtosecond laser according to claim 1 based on 8 word chamber mode locking of mixed type, it is characterised in that:
In the main oscillations loop, Polarization Control Module one includes polarizer and polarization splitting prism；Laser passes through polarizer
After adjusting, it is transmitted to polarization splitting prism and carries out polarization beam splitting, the laser of horizontal polarization is as based on 8 word chamber mode locking of mixed type
The laser of Erbium doped fiber femtosecond laser exports, and vertical polarization laser is transmitted to Electro-optical Modulation crystal by polarizer；It is described
Polarizer be one of quarter-wave plate, half-wave plate, electric light light polarization modulator and magneto-optic polarization rotator or concatenation
Two kinds.
5. the Erbium doped fiber femtosecond laser according to claim 1 based on 8 word chamber mode locking of mixed type, it is characterised in that:
In the main oscillations loop, Polarization Control Module two is that quarter-wave plate, half-wave plate, electric light light polarization modulator and magneto-optic are inclined
Two kinds of one of rotator or the concatenation of shaking.
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