CN108598856A - Femto-second laser - Google Patents
Femto-second laser Download PDFInfo
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- CN108598856A CN108598856A CN201810187215.7A CN201810187215A CN108598856A CN 108598856 A CN108598856 A CN 108598856A CN 201810187215 A CN201810187215 A CN 201810187215A CN 108598856 A CN108598856 A CN 108598856A
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
Abstract
This disclosure relates to which field of lasers, provides a kind of femto-second laser, which is characterized in that including：Optical fiber loop is used for transmission first laser signal and second laser signal；Fiber optic splitter is connect with the optical fiber loop, for receiving the first laser signal and the second laser signal, and changes the phase difference between the first laser signal and the second laser signal, so that the femto-second laser self-locking mode；Free space light path is connect with the fiber optic splitter, for the laser signal received to be reflexed to the fiber optic splitter.The disclosure realizes the self-locking mode of femto-second laser, improves the repetition rate of the laser pulse of output, reduces system noise, and improves the robustness of system.
Description
Technical field
This disclosure relates to field of laser device technology, more particularly to a kind of femto-second laser.
Background technology
Femto-second laser is the core synthesizer part of optical frequency com, and time domain output is that have surpassing for intervals
Narrow laser pulse sequence, frequency domain are the frequency broach for having certain frequency interval.Mode locking femto-second laser is as femtosecond optics
Core component in frequency comb, there are two controlled frequency amounts for it, are repetition rate and carrier phase frequency respectively.Due to two frequencies
Rate controlled quatity is in microwave band, therefore light-wave band and microwave band can be directly connected to by femtosecond laser frequency comb
Come, realizes the direct measurement of optical frequency.The appearance of femtosecond laser frequency comb is precision spectroscopy, optical frequency standard and light
The fields such as clock bring breakthrough progress.
The performance of femto-second laser is directly related with the performance indicator of optical frequency com and reliability：On the one hand, femtosecond swashs
The intensity and phase noise level of light device determine the stiffness of system of optical frequency com；On the other hand, the ring of femto-second laser
Border susceptibility determines the reliability (environmental suitability) of optical frequency com.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 it is researcher's important research content of interest to improve the system robustness of femto-second laser.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Invention content
The disclosure is designed to provide a kind of femto-second laser, and then is overcome at least to a certain extent due to related skill
One or more problem caused by the limitation and defect of art.
Other characteristics and advantages of the disclosure will be apparent from by the following detailed description, or partially by the disclosure
Practice and acquistion.
According to the one side of the disclosure, a kind of femto-second laser is provided, which is characterized in that including：
Optical fiber loop is used for transmission first laser signal and second laser signal；
Fiber optic splitter is connect with the optical fiber loop, for receiving the first laser signal and the second laser
Signal, and change the phase difference between the first laser signal and the second laser signal, so that the femto-second laser
Self-locking mode；
Free space light path is connect with the fiber optic splitter, for the laser signal received to be reflexed to the light
Fine beam splitter.
In an exemplary embodiment of the disclosure, the optical fiber loop includes polarization-maintaining er-doped gain fibre, single mode polarization-maintaining light
Fine and wavelength division multiplexer.
In an exemplary embodiment of the disclosure, the polarization-maintaining er-doped gain fibre is located at the asymmetric of the optical fiber loop
Position, it is poor for making the first laser signal and the second laser signal generate nonlinear phase.
In an exemplary embodiment of the disclosure, the fiber optic splitter includes the first optical fiber collimator, the second optical fiber standard
Straight device, the first half-wave plate, the second half-wave plate, the first polarization splitting prism, the second polarization splitting prism and non-inequality phase-shifter.
In an exemplary embodiment of the disclosure, the non-inequality phase-shifter is located at first polarization splitting prism and
Between two polarization splitting prisms.
In an exemplary embodiment of the disclosure, the non-inequality phase-shifter includes Faraday polarization apparatus and 1/8th waves
Piece.
In an exemplary embodiment of the disclosure, the laser signal of free space light path reflection by described eight/
One wave plate forms third laser signal and the 4th laser signal, the phase of the third laser signal and the 4th laser signal
Difference isThe third laser signal and the 4th laser signal again pass by described 1/8th after the optical fiber loop
Wave plate forms the 5th laser signal and the 6th laser signal, and the phase of the 5th laser signal and the 6th laser signal
Difference is
In an exemplary embodiment of the disclosure, the 5th laser signal and the 6th laser signal are described second
Interference forms the 7th laser signal in polarization splitting prism, and the 7th laser signal part is through second polarization splitting prism
Output laser is reflected to form, is partly transmitted into the free space light path through the polarization splitting prism.
In an exemplary embodiment of the disclosure, the free space light path includes laser mirror.
In an exemplary embodiment of the disclosure, the free space light path includes Electro-optical Modulation crystal, laser mirror
And piezoelectric ceramic actuator.
As shown from the above technical solution, the femto-second laser in disclosure exemplary embodiment at least have following advantages and
Good effect：
Femto-second laser in the disclosure includes optical fiber loop, fiber optic splitter and free space light path, fiber optic splitter
The laser signal exported from two output ends of optical fiber loop is received, and changes the phase difference between two laser signals；The same time
Fine beam splitter is received from the laser signal reflected by space optical path.On the one hand the disclosure changes the phase between laser signal
Difference makes femto-second laser realize self-locking mode；On the other hand the nonlinear optical fiber formed by optical fiber loop and fiber optic splitter
Amplify annular mirror, improves the robustness of femto-second laser system, realize the output of high repeat frequency pulsed laser；In addition,
Femto-second laser in the disclosure is compact-sized, encapsulation is simple, stable.
The disclosure it should be understood that more than general description and following detailed description be only exemplary and explanatory
, the disclosure can not be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 shows the structural schematic diagram of femto-second laser in disclosure exemplary embodiment；
Fig. 2 shows the structural schematic diagrams of femto-second laser in disclosure exemplary embodiment；
Fig. 3 shows the structural schematic diagram of non-inequality phase-shifter in disclosure exemplary embodiment；
Fig. 4 shows the reflectance curve of non-linear amplifier fiber annular mirror in disclosure exemplary embodiment；
Fig. 5 shows the mode-locked spectrum figure of femto-second laser in disclosure exemplary embodiment.
Specific implementation mode
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be in any suitable manner incorporated in one or more embodiments.In the following description, it provides perhaps
More details fully understand embodiment of the present disclosure to provide.It will be appreciated, however, by one skilled in the art that can
It is omitted with technical solution of the disclosure one or more in the specific detail, or others side may be used
Method, constituent element, device, step etc..In other cases, be not shown in detail or describe known solution to avoid a presumptuous guest usurps the role of the host and
So that all aspects of this disclosure thicken.
In this specification using term "one", " one ", "the" and " described " to indicate there are one or more elements/
Component part/etc.；Term " comprising " and " having " is indicating the open meaning being included and refer in addition to listing
Element/component part/also may be present except waiting other element/component part/etc.；Term " first " and " second " etc. are only made
It is used for label, is not the quantity limitation to its object.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.Identical attached drawing mark in figure
Note indicates same or similar part, thus will omit repetition thereof.Some block diagrams shown in attached drawing are work(
Energy entity, not necessarily must be corresponding with physically or logically independent entity.
The initial optical frequency com in this field is the system based on Ti∶Sapphire laser solid-state femto-second laser, Ti∶Sapphire laser femtosecond laser
Utensil has the advantages that noise is low and can generate high repetition frequency broach, but its system is huge, maintenance cost is high, and system
Adaptive capacity to environment is poor, cannot meet the needs of various application fields.In recent years, it with the progress of Fiber laser technology, is based on
The optical frequency com system of ultrashort pulse fiber laser structure is due to densification structure, higher transformation efficiency and length
The characteristics such as phase steady running are widely used in numerous Applied research fields, wherein with the application of Erbium doped fiber femtosecond laser
Research is the most typical.
Usually used mode-locking technique includes 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 femto-second laser based on saturable absorber mode locking, saturable absorber has semiconductor saturated absorption mirror
(SESAM), several different materials such as graphene and carbon nanotube.Since above-mentioned saturable absorber all has slow saturated absorption
Characteristic makes the output pulse of this kind of laser often in picosecond magnitude, and based on the laser of saturable absorber mode locking mechanism
Device noise level is higher.In addition, excessively high pump power can puncture and damage saturable absorber material, limits and be based on to satisfy
With the output power and pulse energy of the femto-second laser of absorber mode locking.
Femto-second laser based on nonlinear polarization rotation mode locking mechanism is related to luminous intensity by generating in a fiber
Nonlinear phase shift, and by the selection of polarization state realize mode locking, by optics cavity carry out dispersion management, may be implemented tens
The pulse of femtosecond magnitude exports, and the femto-second laser based on nonlinear polarization rotation mode locking mechanism has low noise.But due to
The mode-lock status of femto-second laser based on nonlinear polarization rotation mode locking mechanism is close with laser polarization state, and environment temperature changes
Change, vibration and fibre-optical bending change etc. can all cause the variation even losing lock of mode-lock status.In addition, being based on nonlinear polarization rotation
The femto-second laser of mode locking mechanism needs to find mode-lock status by the adjusting of polarizer, does not open lock function certainly.
Femto-second laser based on nonlinear amplified loop mirror mode locking generally uses full polarization fibre to design, and has reliability
Height, miniaturization and easily practical advantage.By the way that phase-modulator is added in optics cavity so that such laser has to be opened certainly
Lock function.Femto-second laser generally use figure of eight structure based on nonlinear amplified loop mirror mode locking, figure of eight structure by
Interferometric loop and optical transport loop composition, are all optical fibre structure.But during figure of eight laser fabrication, need various light
The repetition rate of fiber device welding, general pulse is relatively low, and uses all optical fibre structure, it is difficult to which frequency is added in laser cavity
Control element.
For femto-second laser in this field there are the problem of, present disclose provides a kind of femto-second laser, Fig. 1 is shown
The structural schematic diagram of femto-second laser, as shown in Figure 1, femto-second laser 100 includes optical fiber loop 101,102 and of fiber optic splitter
Free space light path 103, optical fiber loop 101 are used for transmission first laser signal and second laser signal；Fiber optic splitter 102 with
Optical fiber loop 101 connects, and for receiving first laser signal and second laser signal, and changes first laser signal and second and swashs
Phase difference between optical signal, so that 100 self-locking mode of femto-second laser；Free space light path 103 connects with fiber optic splitter 102
It connects, for the laser signal received to be reflexed to fiber optic splitter 102.
Fiber optic splitter in the femto-second laser of the disclosure can change optical fiber loop output first laser signal and
Phase difference between second laser signal, while free space light path can reflex to the laser signal that fiber optic splitter transmits
Laser generation is formed in fiber optic splitter.On the one hand the disclosure makes femto-second laser realize self-locking mode, another aspect fiber optic loop
Road and fiber optic splitter constitute nonlinear optical fiber and amplify annular mirror light path, improve the repetition rate of the laser pulse of output, into
One step improves the performance of femto-second laser.
In an exemplary embodiment of the disclosure, Fig. 2 shows the structural schematic diagrams of femto-second laser, as shown in Fig. 2, light
Fine loop 101 includes polarization-maintaining er-doped gain fibre 201, single-mode polarization maintaining fiber 202, wavelength division multiplexer 203.Wherein polarization-maintaining er-doped increases
It is connected by single-mode polarization maintaining fiber 202 between beneficial optical fiber 201 and wavelength division multiplexer 203；Polarization-maintaining er-doped gain fibre 201 is located at
It is poor to generate nonlinear phase at asymmetric position in optical fiber loop 101, maintain laser mode locking state；Wavelength division multiplexer
203 for connecting pumping source 204, and pumping laser, which is transmitted to polarization-maintaining er-doped gain fibre 201, generates laser, specifically, pumping
Source 204 can take launch wavelength as the pumping laser of 980nm, and the bait Ions Absorption pumping in polarization-maintaining er-doped gain fibre 201 swashs
The energy of light realizes energy level transition, and spontaneous radiation goes out the laser that wavelength is 1550nm, and is transmitted along single-mode polarization maintaining fiber 202.
The disclosure forms femto-second laser by using full polarization fibre structure, can further increase the robust of femto-second laser system
Property.
It further, can be to the dispersion in optics cavity by polarization-maintaining er-doped gain fibre 201 and single-mode polarization maintaining fiber 202
It is managed.Polarization-maintaining er-doped gain fibre 201 can be not only that femto-second laser 100 provides required energy, additionally it is possible to logical
Believe wave band (such as：1550nm wave bands) normal dispersion is provided, while single-mode polarization maintaining fiber 202 is capable of providing unusual color in communication band
It dissipates.According to the abbe number of polarization-maintaining er-doped gain fibre 201 and single-mode polarization maintaining fiber 202, by adjusting polarization-maintaining er-doped gain light
Length ratio between fibre 201 and single-mode polarization maintaining fiber 202 can make the laser of femto-second laser 100 vibrate intracavitary
Dispersion is 0, realizes the inner cavity dispersion management of femto-second laser 100.
In an exemplary embodiment of the disclosure, as shown in Fig. 2, fiber optic splitter 102 includes the first optical fiber collimator
205, the second optical fiber collimator 206, the first half-wave plate 207, the second half-wave plate 208, the first polarization splitting prism 209, second are inclined
Shake Amici prism 210 and non-inequality phase-shifter 211, wherein the output end O of the first optical fiber collimator 205 and optical fiber loop 1011Even
It connects, the output end O of the second optical fiber collimator 206 and optical fiber loop 1012Connection；First half-wave plate 207 is located at the first fiber optic collimator
Between device 205 and the first polarization splitting prism 209, the second half-wave plate 208 is located at the second optical fiber collimator 206 and first polarization point
Between light prism 209；Non- inequality phase-shifter 211 be located at the first polarization splitting prism 209 and the second polarization splitting prism 210 it
Between.There are two output end O for the tool of fiber optic splitter 1023And O4, wherein output end O3It is connect with free space light path 103, output end
O4For output laser pulse.
In an exemplary embodiment of the disclosure, free space light path 103 includes laser mirror, free space light path
103 with the output end O of fiber optic splitter 1023Connection, for reflexing to the laser signal transmitted from fiber optic splitter 102
In fiber optic splitter 102, laser generation is formed.
In an exemplary embodiment of the disclosure, as shown in Fig. 2, free space light path 103 includes Electro-optical Modulation crystal
212, laser mirror 213 and piezoelectric ceramic actuator 214, and the output end of free space light path 103 and fiber optic splitter 102
O3Connection.Electro-optical Modulation crystal 212 is located at the transmission end of the second polarization splitting prism 210, and the size of refractive index can be with
The variation of on-load voltage and change, can quickly a small range change free space light path in optical path length；Piezoelectricity is made pottery
The flexible of the length of porcelain driver 214 is controlled by driving voltage, is changing free space light path 103 on a large scale for low speed
Optical path length；Electro-optical Modulation crystal 212 and piezoelectric ceramic actuator 214 are simultaneously as the feedback member of laser repetition rate locking
Part can make the laser pulse that femto-second laser 100 exports keep constant frequency, improve the performance of femto-second laser.
In an exemplary embodiment of the disclosure, Fig. 3 shows the structural schematic diagram of non-inequality phase-shifter, as shown in figure 3,
Non- inequality phase-shifter 211 includes Faraday polarization apparatus 301 and 1/8th wave plates 302, and wherein Faraday polarization apparatus 301 is close to the
One polarization splitting prism 209 is arranged, and 1/8th wave plates 302 are arranged close to the second polarization splitting prism 210.
In an exemplary embodiment of the disclosure, laser signal is linearly polarized light.The line of freedom of entry space optical path 103 is inclined
The light that shakes is reflected by laser mirror 213, from output end O3The second polarization splitting prism 210 being incident in fiber optic splitter 102,
Light through the transmission of the second polarization splitting prism 210 is vertical polarised light；/ 8th wave plates 302 are rotated, 1/8th waves are made
The fast axle of piece 302 and the angle of vertical polarised light are 45 °, are decomposed into along eight by the vertical polarised light of 1/8th wave plates 302
The third linearly polarized light of the fast axle transmission of/mono- wave plate and the 4th linearly polarized light along slow axis transmission, third linearly polarized light and the
The phase difference of four linearly polarized lights isThen the first polarization splitting prism 209 is transmitted to after Faraday polarization apparatus 301, the
One polarization splitting prism 209 makes horizontal polarization light reflection enter first collimator 205, and vertical polarized light transmission enters the second collimation
Device 206；Adjusting the first half-wave plate 207 keeps horizontal polarization light parallel with slow axis/fast axle of the first optical fiber collimator 205, adjusts the
Two half-wave plates 208 keep vertical polarised light parallel with slow axis/fast axle of the second optical fiber collimator 206；Horizontal polarization light is by the first light
Fine collimator 205 enters optical fiber loop 101, and detour is transferred to the second optical fiber collimator 206 after a week, and polarization state becomes vertical
Polarization so that the linearly polarized light being again incident on the first polarization splitting prism 209 can be transmitted all；Similarly, vertical polarization
Light enters optical fiber loop 101 by the second optical fiber collimator 206, and detour is transferred to the first optical fiber collimator 205 after a week, polarizes
State becomes horizontal polarization so that the linearly polarized light being again incident on the first polarization splitting prism 209 can all reflect；In light
The two bunch polarised lights transmitted in opposite directions in fine loop 101 are exported by the first optical fiber collimator 205 and the second optical fiber collimator 206
Afterwards, the conllinear transmission again after the first polarization splitting prism 209, due to the nonreciprocity of Faraday polarization apparatus 301, two bunch are inclined
Shaking, phase difference increases light after 1/8th wave plates 302 againAlways phase difference isTwo bunch polarised lights are in the second polarization point
It interferes to form third laser in light prism 210, part third laser is reflected through the second polarization splitting prism 210, from output
Hold O4Output；Part third laser is transmitted through the second polarization splitting prism 210, from output end O3Freedom of entry space optical path 103.
In an exemplary embodiment of the disclosure, optical fiber loop 101 and fiber optic splitter 102 collectively form femto-second laser
100 interferometric loop, while being also that a nonlinear optical fiber amplifies annular mirror light path.When nonlinear phase difference is zero, reflection
It is the necessary condition for realizing mode locking that rate, which is not zero, and reflectance curve slope is not zero.Fig. 4 shows properties in nonlinear optical loop mirror
Reflectance curve, as shown in figure 4, when nonlinear phase difference is zero, reflectivity 1, i.e., in the second polarization splitting prism 210
Locate no pulsed laser output, slope of the reflectance curve at this is zero, can not achieve femto-second laser and opens lock certainly.And this public affairs
It is opened in interferometric loop and introduces non-inequality phase-shifter, correspondingly, nonlinear optical fiber amplifies the reflectance curve of annular mirror to the right
It movesWhen nonlinear phase difference is zero, reflectivity 0.5, the maximum slope of reflectance curve so that femto-second laser
Lock can be opened certainly.
In an exemplary embodiment of the disclosure, femto-second laser is reducing after pump energy makes laser losing lock, can be with
By increasing pump energy to lock threshold value is opened, femto-second laser is made to realize self-locking mode；Femtosecond is set to swash when blocking free space light path
When light device losing lock, it can be blocked by removal, femto-second laser is made to realize self-locking mode.
As shown in Fig. 2, the femto-second laser of the disclosure can be " 9 " the word chamber full polarization fibre being made of full polarization fibre
The pulse recurrence frequency of pulse laser, can be promoted to 185MHz by mode locking er-doped femto-second laser, and single pulse energy is promoted
To 0.03nJ, direct output pulse width is less than 100fs, and output 3dB spectral widths are 60nm, as shown in figure 5, being far longer than phase
The output 3dB spectral widths (being less than 40nm) of full polarization fibre mode locking er-doped femto-second laser in the technology of pass.Meanwhile with this field
Commonly " 8 " word chamber full polarization fibre mode locking er-doped femto-second laser is compared, and " 9 " word chamber full polarization fibre mode locking of the disclosure is mixed
The optical fibre device that erbium femto-second laser uses is few, can greatly improve the repetition rate of the laser pulse of output；And in freedom
The frequency controlling elements such as Electro-optical Modulation crystal and piezoelectric ceramic actuator can easily be added in space optical path, reduce and be
System noise, improves the robustness of system.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by appended
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (10)
1. a kind of femto-second laser, which is characterized in that including：
Optical fiber loop is used for transmission first laser signal and second laser signal；
Fiber optic splitter is connect with the optical fiber loop, for receiving the first laser signal and the second laser signal,
And change the phase difference between the first laser signal and the second laser signal, so that the femto-second laser self-locking
Mould；
Free space light path is connect with the fiber optic splitter, for the laser signal received to be reflexed to the optical fiber point
Beam device.
2. femto-second laser according to claim 1, which is characterized in that the optical fiber loop includes polarization-maintaining er-doped gain light
Fine, single-mode polarization maintaining fiber and wavelength division multiplexer.
3. femto-second laser according to claim 2, which is characterized in that the polarization-maintaining er-doped gain fibre is located at the light
The asymmetric position of fine loop, it is poor for making the first laser signal and the second laser signal generate nonlinear phase.
4. femto-second laser according to claim 1, which is characterized in that the fiber optic splitter includes the first fiber optic collimator
Device, the second optical fiber collimator, the first half-wave plate, the second half-wave plate, the first polarization splitting prism, the second polarization splitting prism and non-
Inequality phase-shifter.
5. femto-second laser according to claim 4, which is characterized in that the non-inequality phase-shifter is located at described first partially
It shakes between Amici prism and the second polarization splitting prism.
6. femto-second laser according to claim 4 or 5, which is characterized in that the non-inequality phase-shifter includes faraday
Polarization apparatus and 1/8th wave plates.
7. femto-second laser according to claim 6, which is characterized in that the laser signal of the free space light path reflection
Third laser signal and the 4th laser signal, the third laser signal and the described 4th are formed by 1/8th wave plate
The phase difference of laser signal isThe third laser signal and the 4th laser signal pass through again after the optical fiber loop
It crosses 1/8th wave plate and forms the 5th laser signal and the 6th laser signal, and the 5th laser signal and the described 6th
The phase difference of laser signal is
8. femto-second laser according to claim 7, which is characterized in that the 5th laser signal and the 6th laser
Signal is interfered in second polarization splitting prism forms the 7th laser signal, and the 7th laser signal part is through described the
Two polarization splitting prisms reflect to form output laser, are partly transmitted into the free space optical through the polarization splitting prism
Road.
9. femto-second laser according to claim 1, which is characterized in that the free space light path includes laser reflection
Mirror.
10. femto-second laser according to claim 1, which is characterized in that the free space light path includes Electro-optical Modulation
Crystal, laser mirror and piezoelectric ceramic actuator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104429A (en) * | 2020-09-17 | 2020-12-18 | 电子科技大学 | Femtosecond laser-based underwater frequency transmission system and method |
| CN113300203A (en) * | 2021-07-26 | 2021-08-24 | 济南量子技术研究院 | Rapid mode locking method and system for optical frequency comb |
| CN117578173A (en) * | 2023-10-27 | 2024-02-20 | 北京大学长三角光电科学研究院 | Full polarization-maintaining O-shaped ultrashort pulse mode-locked fiber laser |
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| CN117578173A (en) * | 2023-10-27 | 2024-02-20 | 北京大学长三角光电科学研究院 | Full polarization-maintaining O-shaped ultrashort pulse mode-locked fiber laser |
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