CN105914573A - Internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating method and device - Google Patents
Internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating method and device Download PDFInfo
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- CN105914573A CN105914573A CN201610307877.4A CN201610307877A CN105914573A CN 105914573 A CN105914573 A CN 105914573A CN 201610307877 A CN201610307877 A CN 201610307877A CN 105914573 A CN105914573 A CN 105914573A
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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
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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Abstract
Provided are an internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating method and device, belonging to the ultrafast laser technical field. The method utilizes a frequency stabilized laser to provide source laser, generates a double optical frequency comb through two serially configured acousto-optic frequency shifters and two double-mirror resonant cavities having electrooptical modulators therein, utilizes an dispersion compensation device in a cavity to extend the spectrum range of the generated frequency comb, employs two dual channel signal generators based on a same frequency standard to respectively provide modulation driving signals for the acousto-optic frequency shifters and the electrooptical modulators, and obtains a heterodyning double optical frequency comb having each comb heterodyning interference signal frequency distributed in an arithmetic progression. The invention also provides an internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating device. The heterodyning double optical frequency comb generated by the method possesses the characteristics of large spectrum range and sound frequency invariance; the heterodyning double optical frequency comb generating device has the advantages of high system integrated level, simple structure and low cost.
Description
Technical field
The invention belongs to ultrafast laser technique, relate generally to a kind of based on four mirror annular chamber intracavity modulations and dispersion compensation with tandem
The double optical frequency com of the heterodyne of dual-acousto-optic shift generates method and apparatus.
Background technology
Show as ultrashort laser pulse sequence in time domain owing to optical frequency com has, to show as pectination on frequency domain the most
The characteristic of spectrum so that it is obtain in fields such as pinpoint spectroscopic analysis, absolute distance measurement, optical maser wavelength calibration, time frequency signal transmission
Arrive extensive application.
In recent years, in pinpoint spectroscopic analysis with absolute distance measurement field, measuring method based on the double optical frequency com of heterodyne is not
Disconnected development, has become as its each important research direction in field.Frequency domain aspect, each comb between the double optical frequency com of heterodyne
The heterodyne interference signal of tooth is arithmetic progression distribution, it is simple to the interferometric information of high-precision each comb of extraction.Time domain aspect,
The time interval cyclically-varying of each pulse between the double optical frequency com of heterodyne, its measurement effect is consistent with pulse scanning mode,
Can significantly save the measurement time.
What the double optical frequency com of existing heterodyne generated that method is based primarily upon two set femtosecond frequency comb systems locks control mutually.But the party
In method, the frequency invariances of two set femtosecond frequency comb systems are limited by mutually locking control accuracy, simultaneously its realize apparatus structure complexity,
Cost is high, constrains and based on the double optical frequency com measuring method of heterodyne in pinpoint spectroscopic analysis and absolute distance measurement field enters one
Step development.It addition, the spectral region of optical frequency com has decisive role to the measurement scope in above-mentioned field with precision.Therefore,
Need heterodyne double optical frequency com generation method and apparatus of a kind of big spectral region, altofrequency concordance, low cost badly.
Summary of the invention
The purpose of the present invention is aiming at the problem that above-mentioned prior art exists, and proposes a kind of internal dispersion and compensates series connection shift frequency and four mirrors
Annular chamber double frequency comb generates method and apparatus, reaches to realize the double optics of heterodyne of big spectral region, altofrequency concordance, low cost
The purpose that frequency comb generates.
The purpose of the present invention is achieved through the following technical solutions:
A kind of internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generation method, and the method step is as follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, described emergent light inputs primary acousto-optic after optical isolator and adjusts
Frequency shifter processed, the modulating frequency value of described primary acousto-optic modulation frequency shifter is f1, the 0 of described primary acousto-optic modulation frequency shifter output
Level and+1 grade of shift frequency diffraction light frequency values are respectively v0And v0+f1,+1 grade of shift frequency of described primary acousto-optic modulation frequency shifter output spreads out
Penetrating light one four mirror annular chamber of input, 0 grade of secondary acousto-optic of shift frequency diffraction light input of described primary acousto-optic modulation frequency shifter output is adjusted
Frequency shifter processed, the modulating frequency value of described secondary acousto-optic modulation frequency shifter is f2,+the 1 of described secondary acousto-optic modulation frequency shifter output
Level shift frequency diffraction light frequency values is v0+f2,+1 grade of shift frequency diffraction light of described secondary acousto-optic modulation frequency shifter output inputs another
Four mirror annular chambers, the modulating frequency of the electrooptic modulator each contained in two four mirror annular chambers is respectively f3And f4, two
The dispersion compensation device each contained in four mirror annular chambers compensates laser dispersion in two four mirror annular chambers respectively, described
Two four mirror annular chambers export a branch of optical frequency com respectively, and the two-beam frequency comb of output constitutes the double optical frequency com of heterodyne；
(2) in the double optical frequency com of above-mentioned heterodyne, the center comb frequency of two-beam frequency comb is respectively v0+f1And v0+f2, institute
The center comb frequency-splitting stating two-beam frequency comb is | f1-f2|, the center comb frequency offset frequency of described two-beam frequency comb
Locking；
(3) in the double optical frequency com of above-mentioned heterodyne, the repetition rate of two-beam frequency comb is respectively f3And f4, described two-beam
The repetition rate difference of frequency comb is | f3-f4|, the repetition rate alien frequencies locking of described two-beam frequency comb；
(4) in the double optical frequency com of above-mentioned heterodyne, the frequency of two-beam frequency comb the i-th rank comb is expressed as v0+f1+i×f3
And v0+f2+i×f4, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is | f1-f2|+i×|f3-f4|,
The center comb frequency-splitting of described two-beam frequency comb | f1-f2| with repetition rate difference | f3-f4| meet | f1-f2|>|i|×|f3
-f4|, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is arithmetic progression；
(5) modulated signal of the primary acousto-optic modulation frequency shifter of arranged in series and secondary acousto-optic modulation frequency shifter is by same the dual pathways
Signal generator provides, and the modulated signal of above-mentioned two electrooptic modulator is provided by another double-channel signal generator, and two double
The reference frequency signal of channel signal generator is provided by same reference frequency oscillator.
A kind of internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, depends on the emitting light path of frequency stabilized carbon dioxide laser
Secondary configuration optical isolator and acousto-optic modulation frequency shifter A；+ 1 grade of shift frequency optical diffraction of described acousto-optic modulation frequency shifter A is joined
Put reflecting mirror A, the reflected light path of reflecting mirror A configures four mirror annular chamber A, described four mirror annular chamber A by the first chamber mirror a,
Second chamber mirror a, the 3rd chamber mirror a, the 4th chamber mirror a and electrooptic modulator A composition, the reflection light of reflecting mirror A passes sequentially through the
One chamber mirror a, the second chamber mirror a, the 3rd chamber mirror a is arranged on the reflected light path of the second chamber mirror a, and the 4th chamber mirror a is arranged in the 3rd
On the reflected light path of chamber mirror a, the first chamber mirror a is arranged on the reflected light path of the 4th chamber mirror a, and the first chamber mirror a makes self-reflection
Mirror A reflection light overlap with the reflection light light path from the 4th chamber mirror a, described electrooptic modulator A be arranged in the first chamber mirror a,
In second chamber mirror a, the 3rd chamber mirror a, the 4th chamber mirror a between any two chamber mirrors in light path；Color is configured inside four mirror annular chamber A
Dispersion compensator part A, described dispersion compensation device A is arranged in the first chamber mirror a, the second chamber mirror a, the 3rd chamber mirror a, the 4th chamber mirror
In a between any two chamber mirrors in light path；The transmitted light path of described acousto-optic modulation frequency shifter A configures acousto-optic modulation frequency shifter B,
+ 1 grade of shift frequency optical diffraction of described acousto-optic modulation frequency shifter B configures reflecting mirror B, the reflected light path of reflecting mirror B is joined
Put four mirror annular chamber B, described four mirror annular chamber B by the first chamber mirror b, the second chamber mirror b, the 3rd chamber mirror b, the 4th chamber mirror b and
Electrooptic modulator B forms, and the reflection light of reflecting mirror B passes sequentially through the first chamber mirror b, the second chamber mirror b, the 3rd chamber mirror b configuration
On the reflected light path of the second chamber mirror b, the 4th chamber mirror a is arranged on the reflected light path of the 3rd chamber mirror a, the first chamber mirror b configuration
On the reflected light path of the 4th chamber mirror b, the first chamber mirror b makes the reflection light from reflecting mirror B and the reflection from the 4th chamber mirror b
Light light path overlaps, and described electrooptic modulator B is arranged in the first chamber mirror b, the second chamber mirror b, the 3rd chamber mirror b, the 4th chamber mirror b
Between any two chamber mirrors in light path；Configuring dispersion compensation device B in four mirror annular chamber B, described dispersion compensation device B configures
In the first chamber mirror b, the second chamber mirror b, the 3rd chamber mirror b, the 4th chamber mirror b between any two chamber mirrors in light path；Reference frequency is shaken
Swing device to be connected respectively with double-channel signal generator A, double-channel signal generator B, described double-channel signal generator A and sound
Light modulation frequency shifter A, acousto-optic modulation frequency shifter B connect respectively, described double-channel signal generator B and electrooptic modulator A,
Electrooptic modulator B connects respectively.
The invention have the characteristics that and good result:
(1), compared with optical frequency coms double with existing heterodyne generate method, the present invention utilizes a frequency stabilized carbon dioxide laser for the double light of heterodyne
The generation process learning frequency comb provides source laser, and the double optical frequency com frequency invariance of the heterodyne generated is good.
(2) utilize four mirror annular chamber intracavity modulation formula optical frequency coms to generate method and apparatus and simplify the double optical frequency com of heterodyne
The system structure of generating means, reduces and realizes cost.
(3) tandem dual-acousto-optic shift method and apparatus coordinates synchronous pilot frequency actuation techniques to achieve in the double optical frequency com of heterodyne
The rrequency-offset-lock of heart comb frequency.
(4) intra-cavity phase modulator approach in Crossed Circle chamber coordinates synchronous pilot frequency actuation techniques to achieve the double optical frequency of heterodyne with device
The alien frequencies of comb repetition rate mutually locks.
(5) tandem dual-acousto-optic shift method and apparatus greatly improves the utilization rate of source laser.
(6) four mirror ring cavity structures make the unidirectional electrooptic modulator by intracavity of the laser in resonator cavity, effectively prevent electric light from adjusting
Burning of device processed, it is allowed to export the double optical frequency com of powerful heterodyne.
(7) in resonator, configure dispersion compensation device, be completely eliminated the double optical frequency com of heterodyne in theory in generation chamber
Dispersion, it is achieved maximum spectral region output.
Accompanying drawing explanation
Fig. 1 is that internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means structural representation.
Piece number explanation in figure: 1 frequency stabilized carbon dioxide laser, 2 optical isolators, 3 acousto-optic modulation frequency shifter A, 4 acousto-optic modulation frequency shifters
B, 5 reflecting mirror A, 6 reflecting mirror B, 7 four mirror annular chamber A, 8 first chamber mirror a, 9 second chamber mirror a, 10 the 3rd chamber mirror a,
11 the 4th chamber mirror a, 12 4 mirror annular chamber B, 13 first chamber mirror b, 14 second chamber mirror b, 15 the 3rd chamber mirror b, 16 the 4th chambeies
Mirror b, 17 electrooptic modulator A, 18 electrooptic modulator B, 19 dispersion compensation device A, 20 dispersion compensation device B, 21 ginsengs
Examine frequency oscillator, 22 double-channel signal generator A, 23 double-channel signal generator B.
Detailed description of the invention
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described in further detail.
A kind of internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, on the emitting light path of frequency stabilized carbon dioxide laser 1
Configuration optical isolator 2 and acousto-optic modulation frequency shifter A3 successively；+ 1 grade of shift frequency diffraction light at described acousto-optic modulation frequency shifter A3
On road configure reflecting mirror A5, the reflected light path of reflecting mirror A5 configures four mirror annular chamber A7, described four mirror annular chamber A7 by
First chamber mirror a8, the second chamber mirror a9, the 3rd chamber mirror a10, the 4th chamber mirror a11 and electrooptic modulator A17 composition, reflecting mirror
The reflection light of A5 passes sequentially through the first chamber mirror a8, the second chamber mirror a9, and the 3rd chamber mirror a10 is arranged in the reflection light of the second chamber mirror a9
Lu Shang, the 4th chamber mirror a11 are arranged on the reflected light path of the 3rd chamber mirror a10, and the first chamber mirror a8 is arranged in the 4th chamber mirror a11's
On reflected light path, the first chamber mirror a8 makes the reflection light from reflecting mirror A5 overlap with the reflection light light path from the 4th chamber mirror a11,
Described electrooptic modulator A17 is arranged in the first chamber mirror a8, the second chamber mirror a9, the 3rd chamber mirror a10, the 4th chamber mirror a11 arbitrarily
Between two chamber mirrors in light path；Dispersion compensation device A19, described dispersion compensation device A19 is configured inside four mirror annular chamber A7
It is arranged in the first chamber mirror a8, the second chamber mirror a9, the 3rd chamber mirror a10, the 4th chamber mirror a11 between any two chamber mirrors in light path；
The transmitted light path of described acousto-optic modulation frequency shifter A3 configures acousto-optic modulation frequency shifter B4, at described acousto-optic modulation frequency shifter B4
+ 1 grade of shift frequency optical diffraction on configure reflecting mirror B6, the reflected light path of reflecting mirror B6 configures four mirror annular chamber B12, institute
State four mirror annular chamber B12 by the first chamber mirror b13, the second chamber mirror b14, the 3rd chamber mirror b15, the 4th chamber mirror b16 and Electro-optical Modulation
Device B18 forms, and the reflection light of reflecting mirror B6 passes sequentially through the first chamber mirror b13, the second chamber mirror b14, the 3rd chamber mirror b15 configuration
On the reflected light path of the second chamber mirror b14, the 4th chamber mirror a16 is arranged on the reflected light path of the 3rd chamber mirror a15, the first chamber mirror
B13 is arranged on the reflected light path of the 4th chamber mirror b16, and the first chamber mirror b13 makes from the reflection light of reflecting mirror B6 and from the 4th
The reflection light light path of chamber mirror b16 overlaps, described electrooptic modulator B18 be arranged in the first chamber mirror b13, the second chamber mirror b14, the
In three chamber mirror b15, the 4th chamber mirror b16 between any two chamber mirrors in light path；Dispersion compensator is configured in four mirror annular chamber B12
Part B20, described dispersion compensation device B20 is arranged in the first chamber mirror b13, the second chamber mirror b14, the 3rd chamber mirror b15, the 4th chamber
In mirror b16 between any two chamber mirrors in light path；Reference frequency oscillator 21 and double-channel signal generator A22, double-channel signal
Generator B23 connects respectively, described double-channel signal generator A22 and acousto-optic modulation frequency shifter A3, acousto-optic modulation frequency shifter
B4 connects respectively, and described double-channel signal generator B23 is connected respectively with electrooptic modulator A17, electrooptic modulator B18.
The first chamber mirror a8 of four described mirror annular chamber A7, the second chamber mirror a9, the 3rd chamber mirror a10, the 4th chamber mirror a11 and four
The first chamber mirror b13 of mirror annular chamber B12, the second chamber mirror b14, the 3rd chamber mirror b15, the 4th chamber mirror b16 include plane mirror, recessed
Face mirror and convex mirror chamber mirror type.
Described dispersion compensation device A19 and dispersion compensation device B20 include grating to, prism to and dispersion compensating fiber.
Described electrooptic modulator A17 and electrooptic modulator B18 includes electro-optic intensity modulator and electro-optic phase modulator.
Described reference frequency oscillator 21 includes atomic clock, crystal oscillator, ceramic resonator, electronic oscillator.
A kind of internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generation method, and the method step is as follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, described emergent light inputs primary acousto-optic after optical isolator and adjusts
Frequency shifter processed, the modulating frequency value of described primary acousto-optic modulation frequency shifter is f1, the 0 of described primary acousto-optic modulation frequency shifter output
Level and+1 grade of shift frequency diffraction light frequency values are respectively v0And v0+f1,+1 grade of shift frequency of described primary acousto-optic modulation frequency shifter output spreads out
Penetrating light one four mirror annular chamber of input, 0 grade of secondary acousto-optic of shift frequency diffraction light input of described primary acousto-optic modulation frequency shifter output is adjusted
Frequency shifter processed, the modulating frequency value of described secondary acousto-optic modulation frequency shifter is f2,+the 1 of described secondary acousto-optic modulation frequency shifter output
Level shift frequency diffraction light frequency values is v0+f2,+1 grade of shift frequency diffraction light of described secondary acousto-optic modulation frequency shifter output inputs another
Four mirror annular chambers, the modulating frequency of the electrooptic modulator each contained in two four mirror annular chambers is respectively f3And f4, two
The dispersion compensation device each contained in four mirror annular chambers compensates laser dispersion in two four mirror annular chambers respectively, described
Two four mirror annular chambers export a branch of optical frequency com respectively, and the two-beam frequency comb of output constitutes the double optical frequency com of heterodyne；
(2) in the double optical frequency com of above-mentioned heterodyne, the center comb frequency of two-beam frequency comb is respectively v0+f1And v0+f2, institute
The center comb frequency-splitting stating two-beam frequency comb is | f1-f2|, the center comb frequency offset frequency of described two-beam frequency comb
Locking；
(3) in the double optical frequency com of above-mentioned heterodyne, the repetition rate of two-beam frequency comb is respectively f3And f4, described two-beam
The repetition rate difference of frequency comb is | f3-f4|, the repetition rate alien frequencies locking of described two-beam frequency comb；
(4) in the double optical frequency com of above-mentioned heterodyne, the frequency of two-beam frequency comb the i-th rank comb is expressed as v0+f1+i×f3
And v0+f2+i×f4, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is | f1-f2|+i×|f3-f4|,
The center comb frequency-splitting of described two-beam frequency comb | f1-f2| with repetition rate difference | f3-f4| meet | f1-f2|>|i|×|f3
-f4|, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is arithmetic progression；
(5) modulated signal of the primary acousto-optic modulation frequency shifter of arranged in series and secondary acousto-optic modulation frequency shifter is by same the dual pathways
Signal generator provides, and the modulated signal of above-mentioned two electrooptic modulator is provided by another double-channel signal generator, and two double
The reference frequency signal of channel signal generator is provided by same reference frequency oscillator.
Other levels time shift frequency diffraction light of described primary acousto-optic modulation frequency shifter and secondary acousto-optic modulation frequency shifter equally realizes
State step.
Claims (7)
1. an internal dispersion compensates series connection shift frequency and four mirror annular chamber double frequencies comb generation method, it is characterised in that: described method step
As follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, described emergent light inputs primary acousto-optic after optical isolator and adjusts
Frequency shifter processed, the modulating frequency value of described primary acousto-optic modulation frequency shifter is f1, the 0 of described primary acousto-optic modulation frequency shifter output
Level and+1 grade of shift frequency diffraction light frequency values are respectively v0And v0+ f1,+1 grade of shift frequency of described primary acousto-optic modulation frequency shifter output spreads out
Penetrating light one four mirror annular chamber of input, 0 grade of secondary acousto-optic of shift frequency diffraction light input of described primary acousto-optic modulation frequency shifter output is adjusted
Frequency shifter processed, the modulating frequency value of described secondary acousto-optic modulation frequency shifter is f2,+the 1 of described secondary acousto-optic modulation frequency shifter output
Level shift frequency diffraction light frequency values is v0+f2,+1 grade of shift frequency diffraction light of described secondary acousto-optic modulation frequency shifter output inputs another
Four mirror annular chambers, the modulating frequency of the electrooptic modulator each contained in two four mirror annular chambers is respectively f3And f4, two
The dispersion compensation device each contained in four mirror annular chambers compensates laser dispersion in two four mirror annular chambers respectively, described
Two four mirror annular chambers export a branch of optical frequency com respectively, and the two-beam frequency comb of output constitutes the double optical frequency com of heterodyne；
(2) in the double optical frequency com of above-mentioned heterodyne, the center comb frequency of two-beam frequency comb is respectively v0+f1And v0+f2, institute
The center comb frequency-splitting stating two-beam frequency comb is | f1-f2|, the center comb frequency offset frequency of described two-beam frequency comb
Locking；
(3) in the double optical frequency com of above-mentioned heterodyne, the repetition rate of two-beam frequency comb is respectively f3And f4, described two-beam
The repetition rate difference of frequency comb is | f3- f4|, the repetition rate alien frequencies locking of described two-beam frequency comb；
(4) in the double optical frequency com of above-mentioned heterodyne, the frequency of two-beam frequency comb the i-th rank comb is expressed as v0+f1+i×f3
And v0+ f2+i×f4, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is | f1- f2|+i×|f3- f4|,
The center comb frequency-splitting of described two-beam frequency comb | f1- f2| with repetition rate difference | f3- f4| meet | f1- f2|>|i|×|f3
- f4|, the heterodyne interference signal frequency of described two-beam frequency comb the i-th rank comb is arithmetic progression；
(5) modulated signal of the primary acousto-optic modulation frequency shifter of arranged in series and secondary acousto-optic modulation frequency shifter is by same the dual pathways
Signal generator provides, and the modulated signal of above-mentioned two electrooptic modulator is provided by another double-channel signal generator, and two double
The reference frequency signal of channel signal generator is provided by same reference frequency oscillator.
Internal dispersion the most according to claim 1 compensates series connection shift frequency and four mirror annular chamber double frequencies comb generation method, and its feature exists
In: other levels time shift frequency diffraction light of described primary acousto-optic modulation frequency shifter and secondary acousto-optic modulation frequency shifter equally realizes
State step.
3. internal dispersion compensates series connection shift frequency and a four mirror annular chamber double frequencies comb generating means, in the outgoing of frequency stabilized carbon dioxide laser (1)
Optical isolator (2) and acousto-optic modulation frequency shifter A (3) is configured successively in light path；It is characterized in that: move in described acousto-optic modulation
Frequently configure reflecting mirror A (5) on+1 grade of shift frequency optical diffraction of device A (3), the reflected light path of reflecting mirror A (5) configures
Four mirrors annular chamber A (7), described four mirrors annular chamber A (7) are by the first chamber mirror a (8), the second chamber mirror a (9), the 3rd chamber mirror a
(10), the 4th chamber mirror a (11) and electrooptic modulator A (17) composition, the reflection light of reflecting mirror A (5) passes sequentially through first
Chamber mirror a (8), the second chamber mirror a (9), the 3rd chamber mirror a (10) is arranged on the reflected light path in the second chamber mirror a (9), and the 4th
Chamber mirror a (11) is arranged on the reflected light path in the 3rd chamber mirror a (10), and the first chamber mirror a (8) is arranged in the 4th chamber mirror a (11)
Reflected light path on, the first chamber mirror a (8) makes anti-with from the 4th chamber mirror a (11) of the reflection light from reflecting mirror A (5)
Penetrating light light path to overlap, described electrooptic modulator A (17) is arranged in the first chamber mirror a (8), the second chamber mirror a (9), the 3rd chamber mirror
In a (10), the 4th chamber mirror a (11) between any two chamber mirrors in light path；Mend in the internal configuration dispersion of four mirrors annular chamber A (7)
Repay device A (19), described dispersion compensation device A (19) be arranged in the first chamber mirror a (8), the second chamber mirror a (9), the 3rd
In chamber mirror a (10), the 4th chamber mirror a (11) between any two chamber mirrors in light path；Described acousto-optic modulation frequency shifter A (3)
Acousto-optic modulation frequency shifter B (4) is configured, at+1 grade of shift frequency optical diffraction of described acousto-optic modulation frequency shifter B (4) on transmitted light path
Upper configuration reflecting mirror B (6), configures four mirrors annular chamber B (12), described four mirror rings on the reflected light path of reflecting mirror B (6)
Shape chamber B (12) by the first chamber mirror b (13), the second chamber mirror b (14), the 3rd chamber mirror b (15), the 4th chamber mirror b (16) and
Electrooptic modulator B (18) forms, and the reflection light of reflecting mirror B (6) passes sequentially through the first chamber mirror b (13), the second chamber mirror b (14),
3rd chamber mirror b (15) is arranged on the reflected light path in the second chamber mirror b (14), and the 4th chamber mirror a (16) is arranged in the 3rd chamber mirror
On the reflected light path of a (15), the first chamber mirror b (13) is arranged on the reflected light path in the 4th chamber mirror b (16), the first chamber mirror
B (13) makes the reflection light from reflecting mirror B (6) overlap with the reflection light light path from the 4th chamber mirror b (16), described electricity
Photomodulator B (18) is arranged in the first chamber mirror b (13), the second chamber mirror b (14), the 3rd chamber mirror b (15), the 4th chamber mirror b
(16) between any two chamber mirrors in light path；Dispersion compensation device B (20) is configured in four mirrors annular chamber B (12), described
Dispersion compensation device B (20) be arranged in the first chamber mirror b (13), the second chamber mirror b (14), the 3rd chamber mirror b (15), the 4th
In chamber mirror b (16) between any two chamber mirrors in light path；Reference frequency oscillator (21) and double-channel signal generator A (22),
Double-channel signal generator B (23) connects respectively, described double-channel signal generator A (22) and acousto-optic modulation frequency shifter A
(3), acousto-optic modulation frequency shifter B (4) connect respectively, described double-channel signal generator B (23) and electrooptic modulator A (17),
Electrooptic modulator B (18) connects respectively.
Internal dispersion the most according to claim 3 compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, and its feature exists
In: the first chamber mirror a (8) of four described mirrors annular chamber A (7), the second chamber mirror a (9), the 3rd chamber mirror a (10), the 4th
Chamber mirror a (11) and the first chamber mirror b (13) of four mirrors annular chamber B (12), the second chamber mirror b (14), the 3rd chamber mirror b (15),
4th chamber mirror b (16) includes plane mirror, concave mirror and convex mirror chamber mirror type.
Internal dispersion the most according to claim 3 compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, and its feature exists
In: described dispersion compensation device A (19) and dispersion compensation device B (20) include grating to, prism to and dispersion compensation
Optical fiber.
Internal dispersion the most according to claim 3 compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, and its feature exists
In: described electrooptic modulator A (17) and electrooptic modulator B (18) includes electro-optic intensity modulator and electric light phase-modulation
Device.
Internal dispersion the most according to claim 3 compensates series connection shift frequency and four mirror annular chamber double frequencies comb generating means, and its feature exists
In: described reference frequency oscillator (21) includes atomic clock, crystal oscillator, ceramic resonator, electronic oscillator.
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