CN207217989U - A kind of weak modulation F P chambers of two-part - Google Patents
A kind of weak modulation F P chambers of two-part Download PDFInfo
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Abstract
The utility model discloses a kind of weak modulation F P chambers of two-part, including two sections of different optical fiber, completely reflecting mirror and dichroic mirror；Two sections of different optical fiber are connected by way of physics docking between each other；Two sections of respective other ends of optical fiber are placed with dichroic mirror and completely reflecting mirror respectively；The burnishing surface of dichroic mirror and completely reflecting mirror fiber alignments different from two sections respectively constitutes two weak modulation F P chambers for having interaction；Wherein, dichroic mirror is more than 90% to the transmission of pumping light power, is less than 10% to the transmission of flashlight；The length of two sections of different optical fiber, which is respectively less than, is equal to 10cm.The utility model breaches limitation of the conventional method to F P fineness of cavity, by suppression of the fan-shaped envelope to longitudinal mode caused by two F P chambers interactions, suppresses fundamental frequency, directly generates two stable frequencys multiplication.The utility model is simple and compact for structure, and modulation depth have dropped two orders of magnitude, and the realization, particle in astronomicalc optics frequency comb accelerate integrated chip of laser system etc., are with a wide range of applications.
Description
Technical field
It the utility model is related to high-fineness F-P cavity technical field, and in particular to one kind can realize that pulse recurrence frequency adds
The weak modulation Fabry Perot chamber (hereinafter referred to as F-P cavity) of two-part again.
Background technology
In order to meet the needs of astrosurveillance spectroscopic calibration, the accurately detecting of class earth planet is better achieved, how will
Laser output pulse recurrence frequency doubles, and is always the emphasis problem being concerned.In recent years, concern journey of the people to the outer space
Degree is continuously increased, and the research of repetition rate doubling techniques is increasingly becoming study hotspot.
Repetition doubling techniques have two big thinkings：One is two parallel dichroic mirrors are introduced outside chamber, by building outside chamber
F-P cavity increases repetition rate, and this method most took the lead in proposing earlier than 1989 by Sizer et al., later in a series of experiments
It is proved；The second is building a F-P cavity or equivalent F-P cavity in intracavitary, the pulse output of superelevation repetition is directly realized by.Although mesh
Preceding repetition doubling techniques make some progress on Gao Zhongying broadband spectral direction, still, existing fine
F-P cavity wave filter is spent due to its frequency selectivity, and there is easy off resonance, feedback control system is complicated, train of pulse is irregular etc. asks
Topic, in actual applications with many restrictions.
It is respectively R to be placed with reflectivity for a both ends1And R2Speculum F-P cavity, its fineness is represented by：F
=π (R1R2)1/4/(1-R1R2 1/2).It is presently used for improving the F-P cavity wave filter of pulse recurrence frequency, in order that unwanted arteries and veins
Punching is effectively suppressed, and fineness is generally 102~104In the range of.Although pulse comes and goes in F-P cavity, this inhibitory action
It can double, still, it was reported that suppress to reach 50dB disresonance, it is also desirable to which the fineness of F-P cavity can at least reach
400.However, high-fineness can bring the difficulty of the peak value and required pattern congruity that keep filter transfer, and it is accumulated
Effect can cause phase drift.
In order to solve these problems, high-fineness F-P cavity is overcome the defects of to be doubled in pulse recurrence frequency, this practicality is new
Type proposes a kind of weak modulation F-P cavity of new two-part, and it is breached in the past to the limit of fineness requirement, allows fineness to drop
Low two orders of magnitude, and the high s/n ratio suitable with high-fineness F-P cavity quality can be produced directly in mode-locked laser
Two frequencys multiplication.
Utility model content
One of the purpose of this utility model be to propose it is a kind of pulse recurrence frequency can be doubled in laser cavity
Weak modulation F-P cavity, its weak modulation depth will decline two orders of magnitude than the traditional F-P cavity having been reported.
The purpose of this utility model is realized at least through one of following scheme.
A kind of weak modulation F-P cavity of two-part, including two sections of different optical fiber, completely reflecting mirror and dichroic mirror；Two sections different
The both ends of optical fiber are connected by way of physics docking between each other by mirror finish, two sections of different optical fiber；Two sections of differences
The respective other end of optical fiber be placed with dichroic mirror and completely reflecting mirror respectively；Dichroic mirror and completely reflecting mirror are not shared the same light with two sections respectively
The burnishing surface of fibre docking constitutes two weak modulation F-P cavities for having interaction；Wherein, transmission of the dichroic mirror to pumping light power
More than 90%, 10% is less than to the transmission of flashlight；The length of two sections of different optical fiber, which is respectively less than, is equal to 10cm.
Further, after input pumping light, two F-P cavities can interact, and produce a fan-shaped periodicity envelope；Should
Envelope can suppress fundamental frequency, directly produce two frequencys multiplication.
Further, its modulation depth is respectively less than 10%, and fineness is less than 100.
Further, two sections of different optical fiber are respectively one section of Active Optical Fiber and one section of passive fiber, two sections of different light
After fine both ends are polished to minute surface, wherein it will be connected with each other one end by the way of mechanical splice；Active Optical Fiber not with passive light
The other end of fibre connection, places completely reflecting mirror；The other end that passive fiber is not connected with Active Optical Fiber, place dichroic mirror；It is active
Optical fiber has separately constituted two sections of weak modulation F-P cavities that are closely coupled, having interaction with passive fiber.
Further, a kind of weak modulation F-P cavity of described two-part is from left to right dichroic mirror successively, the first earthenware,
General single mode fiber, the second earthenware, the 3rd earthenware, gain fibre, the 4th earthenware, completely reflecting mirror；Wherein each earthenware
Internal diameter it is identical with the external diameter of optical fiber, general single mode fiber and gain fibre are through in earthenware；The end face of each earthenware polishes
After carry out mirror finish processing；Dichroic mirror is 95% to the transmitance of pump light, and the transmitance to flashlight is 5%；Dichroic mirror
The flat end face structure of the first weak modulation F-P cavity, completely reflecting mirror and the 3rd earthenware is constituted with the flat end face of the second earthenware
Into the second weak modulation F-P cavity；Two sections of optical fiber are general by way of mechanical splice by the second earthenware and the 3rd earthenware
Logical single-mode fiber and gain fibre link together.
Further, a kind of described two-part it is weak modulation F-P cavity be successively from left to right dichroic mirror, the first glass tube,
General single mode fiber, the second glass tube, gain fibre, completely reflecting mirror；Wherein, the external diameter phase of the internal diameter of each glass tube and optical fiber
Together, optical fiber is through in glass tube, and the end face of glass tube carries out mirror finish processing after polishing；Transmitance of the dichroic mirror to pump light
For 90%, the transmitance to flashlight is 5%；The flat end face of dichroic mirror and the first glass tube other end constitutes the first weak tune
The flat end face of F-P cavity processed, completely reflecting mirror and the second glass tube other end constitutes the second weak modulation F-P cavity；First glass tube
With the second glass tube by way of mechanical splice, two sections of optical fiber are linked together.
Compared with prior art, the utility model has advantages below：
The utility model is by building the weak modulation F-P cavity of a two-part, it is proposed that a kind of new pulse recurrence frequency adds
Method again.It breaches limitation of the conventional method to F-P cavity fineness, by fan-shaped caused by two F-P cavity interactions
Suppression of the envelope to longitudinal mode, suppress fundamental frequency and produce, be directly realized by doubling for repetition rate.The two-part F-P cavity with it is common
F-P cavity compare, simple and compact for structure, modulation depth have dropped two orders of magnitude, realization, particle in astronomicalc optics frequency comb
Accelerate integrated chip of laser system etc., be with a wide range of applications.
Brief description of the drawings
Fig. 1 is the two-part F-P cavity constructional device figure in the utility model embodiment 1.
Fig. 2 is the two-part F-P cavity constructional device figure in the utility model embodiment 2.
Fig. 3 is the two-part F-P cavity constructional device figure in the utility model test case.
Fig. 4 is the spectrogram of the output pulse in test case.
Fig. 5 is the time-domain diagram of the output pulse in test case.
Fig. 6 is the autocorrelogram of the output pulse in test case.
Fig. 7 is the reflectance curves of F-P cavity 1 in test case.
Fig. 8 is the reflectance curves of F-P cavity 2 in test case.
Fig. 9 is the result figure of two F-P cavity interactions in test case.
Embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail.But reality of the present utility model
Apply mode not limited to this.
Embodiment 1
Fig. 1 is the two-part F-P cavity structure chart of the present embodiment, is from left to right dichroic mirror 1 successively, the first earthenware 2, general
The logical earthenware 4 of single-mode fiber (SMF 28e) 3, second, the 3rd earthenware 5, gain fibre 6, the 4th earthenware 7, completely reflecting mirror 8；
The internal diameter of wherein each earthenware is identical with the external diameter of optical fiber, and general single mode fiber and gain fibre are through in earthenware；Each ceramics
The end face of pipe carries out mirror finish processing after polishing；Dichroic mirror is 95% to the transmitance of pump light, to the transmitance of flashlight
For 5%；The flat end face of dichroic mirror and the second earthenware 4 constitutes the first weak modulation F-P cavity 1, completely reflecting mirror and the 3rd ceramics
The flat end face of pipe 5 constitutes the second weak modulation F-P cavity 2；The side that second earthenware 4 and the 3rd earthenware 5 pass through mechanical splice
Formula, it is that general single mode fiber and gain fibre link together by two sections of optical fiber.
The length L for the general single mode fiber that this example uses1For 5cm, the length L of gain fibre2For 6cm.
Embodiment 2
Fig. 2 be the present embodiment two-part F-P cavity structure chart, be successively from left to right dichroic mirror 1, the first glass tube 202,
The glass tube 204 of general single mode fiber (SMF 28e) 3, second, gain fibre 5, completely reflecting mirror 6；Wherein, the internal diameter of each glass tube
Identical with the external diameter of optical fiber, optical fiber is through in glass tube, and the end face of glass tube carries out mirror finish processing after polishing；Dichroic mirror pair
The transmitance of pump light is 90%, and the transmitance to flashlight is 5%；Dichroic mirror is smooth with the other end of the first glass tube 202
End face constitutes the first weak modulation F-P cavity, and it is weak that the flat end face of completely reflecting mirror and the other end of the second glass tube 204 constitutes second
Modulate F-P cavity；Two sections of optical fiber are connected to one by the first glass tube 202 and the second glass tube 204 by way of mechanical splice
Rise.
The length L for the general single mode fiber that this example uses1For 4.5cm, the length L of gain fibre2For 3.6cm.
Test case：
Fig. 3 is the two-part F-P cavity structure chart of this test case, is from left to right dichroic mirror 1 successively, the first earthenware 2, general
Logical single-mode fiber 3, the second earthenware 4, Yb codoped phosphate gain fibre 305, completely reflecting mirror 306.Wherein, general single mode stone
The length L of English optical fiber1For 3.6cm, the length L of gain fibre2For 3.3cm, the internal diameter of earthenware is identical with the external diameter of optical fiber, light
Fibre is through in earthenware.The end face of earthenware carries out mirror finish processing after polishing.
In order to reduce collimation loss as far as possible, the mode of using plasma sputtering, the direct plated film of dichroic mirror is being made pottery
On the fiber end face of porcelain tube 2.The dichroic mirror is 0.7% to 1564nm signal light transmission rate, the pumping light transmission rate to 976nm
For 95%.The other end of first earthenware 2 with the second earthenware 4 by way of physics docks, general single mode fiber 3 is i.e. general
Logical single-mode quartz optical fibers link together with Yb codoped phosphate gain fibre 305.
The completely reflecting mirror 306 of low order end is placed on using saturable absorbing mirror (SESAM), the speculum is to 1550nm
Neighbouring light has strong reflection effect, and 90.8% is up to 1564nm signal light reflectivity.
From Fig. 3 directions of arrow inject optical wavelength be 976nm, the pump light that power is 850mW, using oscillograph, frequency spectrograph,
The equipment such as autocorrelation function analyzer detect to emergent light.
Test result is as follows：
Fig. 4, Fig. 5, Fig. 6 are respectively spectrogram, time-domain diagram and the autocorrelogram of the output pulse in test case.Test case
In, the equivalent length of mode-locked laser chamber is 6.9cm, according to light velocity c, the long L of chamber, fundamental frequency repetition rate B and optical fibre refractivity n pass
It is that the fundamental frequency repetition rate of the laser cavity is about 1.44GH knowable to B=c/ (nL) is calculated.Can from time-domain diagram and spectrogram
Go out, the repetition rate for exporting pulse is about 2.8GHz, is twice of fundamental frequency.In addition, can from spectrogram and autocorrelogram
Go out, the pulse signal to noise ratio after being doubled is up to 75dB, pulse width 3.9ps, illustrates there is very high pulse quality.
In test case, the theoretical mechanism that repetition rate can double in the weak modulation F-P cavity of two-part is as follows：
Because used phosphate gain fibre is different from the refractive index of commercial silica fibre, polishes and thrown again by minute surface
After light processing, when being linked together with the mode of mechanical splice, an about reflectivity be present to 1564nm light between end face
About 4% weak reflection.Therefore.The flat end face of the other end of 1 and first earthenware of dichroic mirror 2 constitutes the first weak modulation F-P
Chamber, and the flat end face of S ESAM and the other end of earthenware 4 constitutes the second weak modulation F-P cavity., can be with according to data above
The F-P cavity of the two weak modulation is calculated, fineness is respectively 1.6% and 1.8%.For the two weak modulation F-P cavities, pulse
The reflective function transmitted wherein mathematically can use lower array function description：
Wherein, u is electric field amplification, and z is the longitudinal pitch of optical fiber, and in the t relaxation times, ω is angular frequency.β2, γ, g and Ω point
It is not 2nd order chromatic dispersion constant, nonlinear factor, saturable gain coefficient and gain bandwidth constant.RaIt is SESAM under saturated conditions
Reflectance factor.
For the first F-P cavity, the reflectivity curve calculated by above formula is as shown in Figure 7.
For the second F-P cavity, the reflectivity curve calculated by above formula is as shown in Figure 8.
Above-mentioned two function is done into multiplication cross computing, you can the result (Fig. 9) of two F-P cavity interactions is obtained, while
It is the theoretical value of output result in this test case.It can be seen that sector caused by two F-P cavity interactions generates to longitudinal mode
Compacting well, it is suppressed that fundamental frequency, directly produce two times of repetition rates.In fan-shaped envelope, small peak-to-peak interval is about
2.86GHz, the overall width of fan-shaped envelope is 36.19GHz, is fitted like a glove with foregoing pulse behaviors test result.
Above-described embodiment is one of embodiment of the present utility model, but embodiment of the present utility model is not by described
The limitation of embodiment and test case, it is other it is any without departing from the change made under Spirit Essence of the present utility model and principle,
Modification, substitute, combine, simplifying, should be equivalent substitute mode, be included within the scope of protection of the utility model.
Claims (5)
1. a kind of weak modulation F-P cavity of two-part, it is characterised in that including two sections of different optical fiber, completely reflecting mirror and dichroic mirror；Two
The both ends of Duan Butong optical fiber are connected by way of physics docking between each other by mirror finish, two sections of different optical fiber；
Two sections of respective other ends of different optical fiber are placed with dichroic mirror and completely reflecting mirror respectively；Dichroic mirror and completely reflecting mirror are respectively with two
The burnishing surface of Duan Butong fiber alignments constitutes two weak modulation F-P cavities for having interaction；Wherein, dichroic mirror is to pump light work(
The transmission of rate is more than 90%, is less than 10% to the transmission of flashlight；The length of two sections of different optical fiber, which is respectively less than, is equal to 10cm.
A kind of 2. weak modulation F-P cavity of two-part according to claim 1, it is characterised in that after input pumping light, two F-P
Chamber can interact, and produce a fan-shaped periodicity envelope；The envelope can suppress fundamental frequency, directly produce two frequencys multiplication.
A kind of 3. weak modulation F-P cavity of two-part according to claim 1, it is characterised in that two sections of different optical fiber difference
For one section of Active Optical Fiber and one section of passive fiber, after the both ends of two sections of different optical fiber are polished to minute surface, using mechanical splice
Mode wherein will be connected with each other one end；The other end that Active Optical Fiber is not connected with passive fiber, place completely reflecting mirror；Passive fiber
The other end not being connected with Active Optical Fiber, place dichroic mirror；Active Optical Fiber and passive fiber separately constituted two sections it is closely coupled,
There is the weak modulation F-P cavity of interaction.
4. the weak modulation F-P cavity of a kind of two-part according to claim 1, it is characterised in that be from left to right two colors successively
Mirror, the first earthenware, general single mode fiber, the second earthenware, the 3rd earthenware, gain fibre, the 4th earthenware, total reflection
Mirror；The internal diameter of wherein each earthenware is identical with the external diameter of optical fiber, and general single mode fiber and gain fibre are through in earthenware；Each pottery
The end face of porcelain tube carries out mirror finish processing after polishing；Dichroic mirror is 95% to the transmitance of pump light, to the transmitance of flashlight
For 5%；The flat end face of dichroic mirror and the second earthenware constitutes the first weak modulation F-P cavity, completely reflecting mirror and the 3rd earthenware
Flat end face constitutes the second weak modulation F-P cavity；Second earthenware and the 3rd earthenware are by way of mechanical splice, by two sections
Optical fiber is that general single mode fiber and gain fibre link together.
5. the weak modulation F-P cavity of a kind of two-part according to claim 1, it is characterised in that be from left to right two colors successively
Mirror, the first glass tube, general single mode fiber, the second glass tube, gain fibre, completely reflecting mirror；Wherein, the internal diameter of each glass tube with
The external diameter of optical fiber is identical, and optical fiber is through in glass tube, and the end face of glass tube carries out mirror finish processing after polishing；Dichroic mirror is to pump
The transmitance of Pu light is 90%, and the transmitance to flashlight is 5%；The flat end face of dichroic mirror and the first glass tube other end is formed
The flat end face of first weak modulation F-P cavity, completely reflecting mirror and the second glass tube other end constitutes the second weak modulation F-P cavity；
First glass tube and the second glass tube are linked together two sections of optical fiber by way of mechanical splice.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611757A (en) * | 2017-09-23 | 2018-01-19 | 华南理工大学 | A kind of weak modulation F P chambers of two-part |
| CN113036586A (en) * | 2021-03-10 | 2021-06-25 | 厦门大学 | On-chip integrated high repetition frequency laser resonant cavity device and ultrashort pulse laser |
-
2017
- 2017-09-23 CN CN201721228654.5U patent/CN207217989U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611757A (en) * | 2017-09-23 | 2018-01-19 | 华南理工大学 | A kind of weak modulation F P chambers of two-part |
| CN107611757B (en) * | 2017-09-23 | 2024-04-19 | 华南理工大学 | Two-section type weak modulation F-P cavity |
| CN113036586A (en) * | 2021-03-10 | 2021-06-25 | 厦门大学 | On-chip integrated high repetition frequency laser resonant cavity device and ultrashort pulse laser |
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