CN103424194B - A kind of measuring method of frequency stability of femtosecond laser frequency comb and device - Google Patents
A kind of measuring method of frequency stability of femtosecond laser frequency comb and device Download PDFInfo
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- CN103424194B CN103424194B CN201310351298.6A CN201310351298A CN103424194B CN 103424194 B CN103424194 B CN 103424194B CN 201310351298 A CN201310351298 A CN 201310351298A CN 103424194 B CN103424194 B CN 103424194B
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Abstract
The present invention relates to a kind of measuring method and device of frequency stability of femtosecond laser frequency comb, belong to physical field, optical engineering field and metrological testing technology field.Structure of the present invention is simple, cost is low, easily realize, by the mode using femtosecond laser frequency comb and temporal frequency counter, frequency synthesizer etc. to share same atomic clock reference frequency, the impact that atomic clock own frequency degree of stability causes is balanced out, thus obtains the repetition frequency, deviation frequency and the comb frequency stability measurement result that do not comprise the femtosecond laser frequency comb of atomic clock stability influence.
Description
Technical field
The present invention relates to a kind of measuring method and device of frequency stability of femtosecond laser frequency comb, belong to physical field, optical engineering field and metrological testing technology field.
Background technology
Take femtosecond laser frequency comb as the femtosecond laser technology of representative, can laser frequency measurement be realized, and the accuracy frequently of high comb can be provided, such as, reach 10
-13, 10
-14even higher.Because this accuracy obtains by the repetition frequency of femtosecond laser frequency comb and deviation frequency being locked onto respectively on atomic frequency, thus, the atomic clock that people find more pin-point accuracy and stability is on the one hand used for carrying out femtosecond laser frequency locking, is also attempting the measuring method finding the frequency stability how measuring the femtosecond laser frequency comb self rejecting atomic frequency stability influence conversely.It is a kind of method that people use that the two light locking onto same atomic frequency comb mutual beat frequency method, has had to use two light to comb mutual shooting method to obtain 10
-18the bibliographical information of degree of stability.But for most of femtosecond laser laboratory, femtosecond laser frequency comb system remains a complexity, huge, expensive system, thus comb stable measurement evaluation is frequently carried out with it, method is no doubt feasible, but conditional request is too high, except a few experiments is outdoor, most of laboratory is difficult to carry out this work, but faces the realistic problem of the femtosecond laser frequency comb stability measurement of institute's development and application.
Summary of the invention
The object of the invention is to comb the mutual beat frequency technology problem high to equipment requirement to overcome existing pair of light, proposing a kind of measuring method and device of frequency stability of femtosecond laser frequency comb.
The present invention is achieved by the following technical solutions.
The measuring method of a kind of frequency stability of femtosecond laser frequency comb of the present invention, extracts repetition frequency f in the spectrum that the method is produced by femtosecond laser frequency comb respectively
rwith deviation frequency f
0, both have been locked in the reference frequency of atomic clock; The frequency of atomic clock synthesizes acquisition one close to deviation frequency f through frequency synthesizer
0frequency values, with deviation frequency f
0the difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer A
0, read difference frequency Δ f with the temporal frequency counter A that base time outer locks onto on atomic frequency
0, and pass to computing machine, the difference frequency Δ f obtained with computer calculate
0namely degree of stability is deviation frequency f
0stable measurement value δ
0, it is stated with Allan standard deviation usually.It is the deviation frequency f of the femtosecond laser frequency comb oneself eliminating atomic clock impact
0degree of stability;
The frequency of atomic clock synthesizes acquisition one close to repetition frequency f through frequency synthesizer
rfrequency values, with repetition frequency f
rthe difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer B
r, read difference frequency Δ f with the temporal frequency counter B that base time outer locks onto on atomic frequency
r, and pass to computing machine, the difference frequency Δ f obtained with computer calculate
rnamely degree of stability is repetition frequency f
rstable measurement value δ
r, it is stated with Allan standard deviation usually.It is the repetition frequency f of the femtosecond laser frequency comb oneself eliminating atomic clock impact
rdegree of stability.
Its repetition frequency f is exported respectively by the photodetector of femtosecond laser frequency comb inside
rwith deviation frequency f
0, they are locked onto on atomic frequency respectively by the phase locking frequency stabilized circuit of femtosecond laser frequency comb inside.The optical frequency f of its femtosecond laser frequency comb
nfor:
f
n=n×f
r+f
0（1）
Wherein, n is the positive integer of the optical frequency sequence number representing femtosecond laser frequency comb, and magnitude is 10
5~ 10
6between.
Temporal frequency counter is locked onto on femtosecond laser frequency comb atomic frequency used, record repetition frequency f respectively by temporal frequency counter
rdegree of stability δ
rwith deviation frequency f
0degree of stability δ
0, be namely picked out the repetition frequency f that atomic clock affects the femtosecond laser frequency comb of part
rwith deviation frequency f
0degree of stability, will both synthesize with side and root mode according to formula (1), can obtain femtosecond laser frequency comb pick out atomic clock impact n-th comb frequency degree of stability δ
n:
The measurement mechanism of a kind of frequency stability of femtosecond laser frequency comb of the present invention, comprises femtosecond laser frequency comb 1, atomic clock 2, frequency synthesizer 3, frequency mixer A4, temporal frequency counter A5, frequency synthesizer 6, frequency mixer B7, temporal frequency counter B8 and computing machine 9.
Repetition frequency f is extracted respectively in the spectrum produced by femtosecond laser frequency comb 1
rwith deviation frequency f
0, both have been locked in the reference frequency of atomic clock 2; The frequency of atomic clock 2 synthesizes acquisition one close to deviation frequency f through frequency synthesizer 3
0frequency values, with deviation frequency f
0the difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer A4
0, read difference frequency Δ f with the temporal frequency counter A5 that base time outer locks onto in atomic clock 2 frequency
0, and pass to computing machine 9, the difference frequency Δ f obtained is calculated with computing machine 9
0namely degree of stability is deviation frequency f
0stable measurement value δ
0, it is stated with Allan standard deviation usually.It is the deviation frequency f eliminating the femtosecond laser frequency comb 1 oneself that atomic clock 2 affects
0degree of stability;
The frequency of atomic clock 2 synthesizes acquisition one close to repetition frequency f through frequency synthesizer 6
rfrequency values, with repetition frequency f
rthe difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer B7
r, read difference frequency Δ f with the temporal frequency counter B8 that base time outer locks onto in atomic clock 2 frequency
r, and pass to computing machine 9, the difference frequency Δ f obtained is calculated with computing machine 9
rnamely degree of stability is repetition frequency f
rstable measurement value δ
r, it is stated with Allan standard deviation usually.It is the repetition frequency f of the femtosecond laser frequency comb oneself eliminating atomic clock impact
rdegree of stability.
Beneficial effect
Structure of the present invention is simple, cost is low, easily realize, by the mode using femtosecond laser frequency comb and temporal frequency counter, frequency synthesizer etc. to share same atomic clock reference frequency, the impact that atomic clock own frequency degree of stability causes is balanced out, thus obtains the repetition frequency, deviation frequency and the comb frequency stability measurement result that do not comprise the femtosecond laser frequency comb of atomic clock stability influence.
This frequency comb can be used for directly measuring the repetition frequency of femtosecond laser frequency comb, deviation frequency and comb frequency stability.
A kind of femtosecond laser frequency comb deviation frequency based on common reference frequency principle and repetition frequency stability measurement method.Be characterized in the frequency stability that can be obtained the femtosecond laser frequency comb far above the atomic frequency standard as locking reference on same device by simple frequency measurement, thus reach the object of femtosecond laser frequency comb being carried out to Basic Evaluation.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention;
Wherein, 1 be femtosecond laser frequency comb, 2 be atomic clock, 3 be frequency synthesizer, 4 be frequency mixer, 5 be temporal frequency counter, 6 be frequency synthesizer, 7 be frequency mixer, 8 be temporal frequency counter, 9 for robot calculator.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment
A kind of measuring method of frequency stability of femtosecond laser frequency comb and device, as shown in Figure 1, femtosecond laser frequency comb 1, atomic clock 2, frequency synthesizer 3, frequency mixer 4, temporal frequency counter 5, frequency synthesizer 6, frequency mixer 7, temporal frequency counter 8, robot calculator 9 is comprised.
Repetition frequency f is extracted respectively in the spectrum produced by femtosecond laser frequency comb 1
r=350MHz and deviation frequency f
0=20MHz, both have been locked on the reference frequency 10MHz of atomic clock 2.The frequency of atomic clock 2 synthesizes acquisition one close to deviation frequency f through frequency synthesizer 3
0frequency values 15MHz, with deviation frequency f
0the difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer 4
0=5MHz, reads difference frequency Δ f with the temporal frequency counter 5 locked onto in atomic clock 2 frequency of base time outer
0, and pass to computing machine 9, the difference frequency Δ f obtained is calculated with computing machine 9
0namely degree of stability is deviation frequency f
0stable measurement value δ
0, it is stated with Allan standard deviation usually.It is the deviation frequency f eliminating the femtosecond laser frequency comb 1 oneself that atomic clock 2 affects
0degree of stability.
The frequency of atomic clock 2 synthesizes acquisition one close to repetition frequency f through frequency synthesizer 6
rfrequency values 360MHz, with repetition frequency f
rthe difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer 7
r=10MHz, reads difference frequency Δ f with the temporal frequency counter 8 locked onto on atomic clock 2 frequency 10MHz of base time outer
r, and pass to computing machine 9, the difference frequency Δ f obtained is calculated with computing machine 9
rnamely degree of stability is repetition frequency f
rstable measurement value δ
r, it is stated with Allan standard deviation usually.It is the repetition frequency f of the femtosecond laser frequency comb oneself eliminating atomic clock impact
rdegree of stability.
The femtosecond laser frequency comb comb using the method for the invention to obtain frequently degree of stability can reach the effect of a number magnitude higher than atomic clock degree of stability.
The above is preferred embodiment of the present invention, and the present invention should not be confined to the content disclosed in this embodiment and accompanying drawing.Every do not depart from spirit disclosed in this invention under the equivalence that completes or amendment, all fall into the scope of protection of the invention.
Claims (4)
1. a measuring method for frequency stability of femtosecond laser frequency comb, is characterized in that: extract repetition frequency f respectively in the spectrum that the method is produced by femtosecond laser frequency comb
rwith deviation frequency f
0, both are locked onto in the reference frequency of atomic clock; The frequency of atomic clock synthesizes acquisition one close to deviation frequency f through first frequency compositor
0frequency values, with deviation frequency f
0the difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer A
0, read difference frequency Δ f with the temporal frequency counter A that base time outer locks onto on atomic frequency
0, and pass to computing machine, the difference frequency Δ f obtained with computer calculate
0namely degree of stability is deviation frequency f
0stable measurement value δ
0;
The frequency of atomic clock synthesizes acquisition one close to repetition frequency f through second frequency compositor
rfrequency values, with repetition frequency f
rthe difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer B
r, read difference frequency Δ f with the temporal frequency counter B that base time outer locks onto on atomic frequency
r, and pass to computing machine, the difference frequency Δ f obtained with computer calculate
rnamely degree of stability is repetition frequency f
rstable measurement value δ
r;
The optical frequency f of femtosecond laser frequency comb
nfor:
f
n＝n×f
r+f
0
Wherein, n is the positive integer of the optical frequency sequence number representing femtosecond laser frequency comb, and magnitude is 10
5~ 10
6between; Femtosecond laser frequency comb picks out the degree of stability δ of the n-th comb frequency of atomic clock impact
n:
2. the measuring method of a kind of frequency stability of femtosecond laser frequency comb according to claim 1, is characterized in that: close to deviation frequency f
0frequency values and f
0difference be 5MHz.
3. the measuring method of a kind of frequency stability of femtosecond laser frequency comb according to claim 1, is characterized in that: close to repetition frequency f
rfrequency values and f
rdifference be 10MHz.
4. a measurement mechanism for frequency stability of femtosecond laser frequency comb, is characterized in that: comprise femtosecond laser frequency comb (1), atomic clock (2), first frequency compositor (3), frequency mixer A (4), temporal frequency counter A (5), second frequency compositor (6), frequency mixer B (7), temporal frequency counter B (8) and computing machine (9);
Repetition frequency f is extracted respectively in the spectrum produced by femtosecond laser frequency comb (1)
rwith deviation frequency f
0, both have been locked in the reference frequency of atomic clock (2); The frequency of atomic clock (2) synthesizes acquisition one close to deviation frequency f through first frequency compositor (3)
0frequency values, with deviation frequency f
0the difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer A (4)
0, read difference frequency Δ f with the temporal frequency counter A (5) that base time outer locks onto in atomic clock (2) frequency
0, and pass to computing machine (9), the difference frequency Δ f obtained is calculated with computing machine (9)
0namely degree of stability is deviation frequency f
0stable measurement value δ
0;
The frequency of atomic clock (2) synthesizes acquisition one close to repetition frequency f through second frequency compositor (6)
rfrequency values, with repetition frequency f
rthe difference frequency Δ f of both mixing acquisitions is carried out through frequency mixer B (7)
r, read difference frequency Δ f with the temporal frequency counter B (8) that base time outer locks onto in atomic clock (2) frequency
r, and pass to computing machine (9), the difference frequency Δ f obtained is calculated with computing machine (9)
rnamely degree of stability is repetition frequency f
rstable measurement value δ
r.
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| DE102014204941A1 (en) * | 2014-03-17 | 2015-09-17 | Menlo Systems Gmbh | Method for operating a laser device, resonator arrangement and use of a phase shifter |
| JP6296609B2 (en) * | 2014-07-05 | 2018-03-20 | 国立研究開発法人情報通信研究機構 | Collective acquisition type photodetection device and photodetection method |
| CN105548036B (en) * | 2015-12-08 | 2018-04-06 | 上海理工大学 | A kind of adaptive double light comb spectroscopic systems |
| CN107024285B (en) * | 2017-04-28 | 2018-12-18 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of full optical fiber laser frequency measuring equipment and method |
| CN109211414B (en) * | 2018-07-13 | 2020-10-16 | 华东师范大学 | Ultrahigh-precision optical frequency tester and testing method thereof |
| CN110987015A (en) * | 2019-12-17 | 2020-04-10 | 中航贵州飞机有限责任公司 | Detection method of multipurpose airplane radio altitude simulator |
| CN115561988B (en) * | 2022-12-06 | 2023-03-07 | 浙江赛思电子科技有限公司 | Time service terminal and time service system and method thereof |
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| JP4607312B2 (en) * | 2000-12-05 | 2011-01-05 | 独立行政法人科学技術振興機構 | Optical frequency measurement system |
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| CN101846861A (en) * | 2009-03-25 | 2010-09-29 | 中国科学院物理研究所 | Single optical frequency comb with high stability and high repetition frequency |
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