CN105896263A - F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating method and device - Google Patents
F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating method and device Download PDFInfo
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- CN105896263A CN105896263A CN201610307978.1A CN201610307978A CN105896263A CN 105896263 A CN105896263 A CN 105896263A CN 201610307978 A CN201610307978 A CN 201610307978A CN 105896263 A CN105896263 A CN 105896263A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/107—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using electro-optic devices, e.g. exhibiting Pockels or Kerr effect
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Abstract
The invention discloses an F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating method and device, belonging to the technical field of ultrafast laser. According to the method, a frequency stabilized laser provides two beams of source laser with use of a light splitter, a double optical frequency comb is generated by two parallel acousto-optic frequency shifters and two F-P cavities in which electro-optical modulators are arranged, the spectral range of the generated frequency comb is expanded by a dispersion compensator outside the cavities, modulation driving signals are separately provided to the acousto-optic frequency shifters and the electro-optical modulators by two double-channel signal generators referring to the same frequency standard, and a heterodyne double optical frequency comb of which tooth heterodyne interference signal frequencies are distributed in arithmetic progression is obtained. The invention further provides an F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating device. The heterodyne double optical frequency comb generated by the method has the characteristics of spectral range and good frequency consistency, and the heterodyne double optical frequency comb generating device has the advantages of high system integration, simple structure, low cost and the like.
Description
Technical field
The invention belongs to ultrafast laser technique, relate generally to one and compensate and parallel based on F-P cavity intracavity modulation and chamber Laser with External Dispersive
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 F-P cavity parallel connection shift frequency and Laser with External Dispersive is mended
Repay double frequency comb and generate method and apparatus, reach to realize the double optical frequency of heterodyne of big spectral region, altofrequency concordance, low cost
The purpose that comb generates.
The purpose of the present invention is achieved through the following technical solutions:
A kind of F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate double frequency comb generation method, and the method step is as follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, the described emergent light device that is split after optical isolator is divided into two
Shu Jiguang, described two bundle laser are respectively by two acousto-optic modulation frequency shifters, the modulating frequency of said two acousto-optic modulation frequency shifter
Value is respectively f1And f2, two+1 grade of shift frequency diffraction light frequency values of bundle of said two acousto-optic modulation frequency shifter output are respectively v0+f1
And v0+f2, described two+1 grade of shift frequency diffraction light of bundle input two F-P cavity respectively, the electric light each contained in two F-P cavity
The modulating frequency of manipulator is respectively f3And f4, said two F-P cavity exports a branch of optical frequency com, two-beam frequency respectively
Comb two dispersion compensation device of input respectively, a branch of optical frequency com double light of composition heterodyne that two dispersion compensation device each export
Learn frequency comb；
(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 parallel configuration 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 F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate double frequency comb generating means, join successively on the emitting light path of frequency stabilized carbon dioxide laser
Put optical isolator and spectroscope；Described spectroscopical transmitted light path configures acousto-optic modulation frequency shifter A, adjusts at described acousto-optic
Configuring F-P cavity A on+1 grade of shift frequency optical diffraction of frequency shifter A processed, described F-P cavity A is by front cavity mirror a, Effect of Back-Cavity Mirror a and electricity
Photomodulator A forms, in F-P cavity A exterior arrangement dispersion compensation device A ,+1 grade of shifting of described acousto-optic modulation frequency shifter A
Frequently diffraction light passes sequentially through front cavity mirror a, electrooptic modulator A, Effect of Back-Cavity Mirror a and dispersion compensation device A；Described spectroscopical instead
Penetrate and in light path, configure reflecting mirror, acousto-optic modulation frequency shifter B successively, at+1 grade of shift frequency diffraction light of described acousto-optic modulation frequency shifter B
Configuring F-P cavity B on road, described F-P cavity B is made up of, in F-P cavity B front cavity mirror b, Effect of Back-Cavity Mirror b and electrooptic modulator B
Exterior arrangement dispersion compensation device B ,+1 grade of shift frequency diffraction light of described acousto-optic modulation frequency shifter B passes sequentially through front cavity mirror b, electricity
Photomodulator B, Effect of Back-Cavity Mirror b and dispersion compensation device B；Reference frequency oscillator and double-channel signal generator A, the dual pathways
Signal generator B connects respectively, described double-channel signal generator A and acousto-optic modulation frequency shifter A, acousto-optic modulation frequency shifter B
Connecting respectively, described double-channel signal generator B is connected respectively with electrooptic modulator A, electrooptic modulator B.
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 F-P cavity intracavity modulation formula optical frequency com to generate method and apparatus and simplify heterodyne double optical frequency com generation
The system structure of device, reduces and realizes cost.
(3) parallel 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) double F-P chambers intra-cavity phase modulator approach 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) F-P cavity is made up of two-chamber mirror, and cavity body structure is simple, and environment resistant vibration interference ability is strong, and device stability is high.
(6) outside resonator, place dispersion compensation device, can significantly reduce the reduction of annular chamber size, beneficially Resonant Intake System
And then promote the repetition rate of the double optical frequency com of heterodyne.
Accompanying drawing explanation
Fig. 1 is F-P cavity parallel connection shift frequency and Laser with External Dispersive compensation double frequency comb generating means structural representation.
In figure piece number explanation: 1 frequency stabilized carbon dioxide laser, 2 optical isolators, 3 beam splitters, 4 reflecting mirrors, 5 acousto-optic frequency shifters A, 6
Acousto-optic frequency shifters B, 7F-P chamber A, 8 front cavity mirror a, 9 Effect of Back-Cavity Mirror a, 10F-P chamber B, 11 front cavity mirror b, 12 Effect of Back-Cavity Mirror b,
13 electrooptic modulator A, 14 electrooptic modulator B, 15 dispersion compensation device A, 16 dispersion compensation device B, 17 reference frequencies
Agitator, 18 double-channel signal generator A, 19 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 F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate double frequency comb generating means, on the emitting light path of frequency stabilized carbon dioxide laser 1 successively
Configuration optical isolator 2 and spectroscope 3；The transmitted light path of described spectroscope 3 configures acousto-optic modulation frequency shifter A5, in institute
State on+1 grade of shift frequency optical diffraction of acousto-optic modulation frequency shifter A5 configuration F-P cavity A7, described F-P cavity A7 by front cavity mirror a8,
Effect of Back-Cavity Mirror a9 and electrooptic modulator A13 composition, in F-P cavity A7 exterior arrangement dispersion compensation device A15, described acousto-optic modulation
+ 1 grade of shift frequency diffraction light of frequency shifter A5 passes sequentially through front cavity mirror a8, electrooptic modulator A13, Effect of Back-Cavity Mirror a9 and dispersion compensator
Part A15；The reflected light path of described spectroscope 3 configures reflecting mirror 4, acousto-optic modulation frequency shifter B6 successively, at described acousto-optic
Modulation frequency shifter B6+1 grade of shift frequency optical diffraction on configure F-P cavity B10, described F-P cavity B10 by front cavity mirror b11, after
Chamber mirror b12 and electrooptic modulator B14 composition, in F-P cavity B10 exterior arrangement dispersion compensation device B16, described acousto-optic modulation
+ 1 grade of shift frequency diffraction light of frequency shifter B6 passes sequentially through front cavity mirror b11, electrooptic modulator B14, Effect of Back-Cavity Mirror b12 and dispersion compensation
Device B16；Reference frequency oscillator 17 is connected respectively with double-channel signal generator A18, double-channel signal generator B19,
Described double-channel signal generator A18 is connected respectively with acousto-optic modulation frequency shifter A5, acousto-optic modulation frequency shifter B6, described bilateral
Road signal generator B19 is connected respectively with electrooptic modulator A13, electrooptic modulator B14.
The front cavity mirror b11 of front cavity mirror a8, Effect of Back-Cavity Mirror a9 and F-P cavity B10 of described F-P cavity A7, Effect of Back-Cavity Mirror b12 include
Plane mirror, concave mirror and convex mirror chamber mirror type.
Described dispersion compensation device A15 and dispersion compensation device B16 include grating to, prism to and dispersion compensating fiber.
Described electrooptic modulator A13 and electrooptic modulator B14 includes electro-optic intensity modulator and electro-optic phase modulator.
Described reference frequency oscillator 17 includes atomic clock, crystal oscillator, ceramic resonator, electronic oscillator.
A kind of F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate double frequency comb generation method, and the method step is as follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, the described emergent light device that is split after optical isolator is divided into two
Shu Jiguang, described two bundle laser are respectively by two acousto-optic modulation frequency shifters, the modulating frequency of said two acousto-optic modulation frequency shifter
Value is respectively f1And f2, two+1 grade of shift frequency diffraction light frequency values of bundle of said two acousto-optic modulation frequency shifter output are respectively v0+f1
And v0+f2, described two+1 grade of shift frequency diffraction light of bundle input two F-P cavity respectively, the electric light each contained in two F-P cavity
The modulating frequency of manipulator is respectively f3And f4, said two F-P cavity exports a branch of optical frequency com, two-beam frequency respectively
Comb two dispersion compensation device of input respectively, a branch of optical frequency com double light of composition heterodyne that two dispersion compensation device each export
Learn frequency comb；
(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 parallel configuration 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. a F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate double frequency comb generation method, it is characterised in that: described method step is as follows:
The emergent light frequency of (1) frequency stabilized carbon dioxide laser is v0, the described emergent light device that is split after optical isolator is divided into two
Shu Jiguang, described two bundle laser are respectively by two acousto-optic modulation frequency shifters, the modulating frequency of said two acousto-optic modulation frequency shifter
Value is respectively f1And f2, two+1 grade of shift frequency diffraction light frequency values of bundle of said two acousto-optic modulation frequency shifter output are respectively v0+f1
And v0+f2, described two+1 grade of shift frequency diffraction light of bundle input two F-P cavity respectively, the electric light each contained in two F-P cavity
The modulating frequency of manipulator is respectively f3And f4, said two F-P cavity exports a branch of optical frequency com, two-beam frequency respectively
Comb two dispersion compensation device of input respectively, a branch of optical frequency com double light of composition heterodyne that two dispersion compensation device each export
Learn frequency comb；
(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 parallel configuration 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.
F-P cavity parallel connection shift frequency the most according to claim 1 and Laser with External Dispersive compensate double frequency comb generation method, it is characterised in that:
Other levels time shift frequency diffraction light of described primary acousto-optic modulation frequency shifter and secondary acousto-optic modulation frequency shifter equally realizes above-mentioned step
Suddenly.
3. F-P cavity parallel connection shift frequency and Laser with External Dispersive compensate a double frequency comb generating means, at the emitting light path of frequency stabilized carbon dioxide laser (1)
On configure optical isolator (2) and spectroscope (3) successively；It is characterized in that: on the transmitted light path of described spectroscope (3)
Configuration acousto-optic modulation frequency shifter A (5), configures F-P on+1 grade of shift frequency optical diffraction of described acousto-optic modulation frequency shifter A (5)
Chamber A (7), described F-P cavity A (7) is made up of front cavity mirror a (8), Effect of Back-Cavity Mirror a (9) and electrooptic modulator A (13),
At F-P cavity A (7) exterior arrangement dispersion compensation device A (15) ,+1 grade of shift frequency of described acousto-optic modulation frequency shifter A (5)
Diffraction light passes sequentially through front cavity mirror a (8), electrooptic modulator A (13), Effect of Back-Cavity Mirror a (9) and dispersion compensation device A (15)；
The reflected light path of described spectroscope (3) configures reflecting mirror (4), acousto-optic modulation frequency shifter B (6) successively, at described acousto-optic
Configuring F-P cavity B (10) on+1 grade of shift frequency optical diffraction of modulation frequency shifter B (6), described F-P cavity B (10) is by ante-chamber
Mirror b (11), Effect of Back-Cavity Mirror b (12) and electrooptic modulator B (14) composition, mend in F-P cavity B (10) exterior arrangement dispersion
Repaying device B (16) ,+1 grade of shift frequency diffraction light of described acousto-optic modulation frequency shifter B (6) passes sequentially through front cavity mirror b (11), electricity
Photomodulator B (14), Effect of Back-Cavity Mirror b (12) and dispersion compensation device B (16)；Reference frequency oscillator (17) and the dual pathways
Signal generator A (18), double-channel signal generator B (19) connect respectively, described double-channel signal generator A (18)
It is connected respectively with acousto-optic modulation frequency shifter A (5), acousto-optic modulation frequency shifter B (6), described double-channel signal generator B (19)
It is connected respectively with electrooptic modulator A (13), electrooptic modulator B (14).
F-P cavity parallel connection shift frequency the most according to claim 3 and Laser with External Dispersive compensate double frequency comb generating means, it is characterised in that:
The front cavity mirror b (11) of the front cavity mirror a (8) of described F-P cavity A (7), Effect of Back-Cavity Mirror a (9) and F-P cavity B (10), after
Chamber mirror b (12) includes plane mirror, concave mirror and convex mirror chamber mirror type.
F-P cavity parallel connection shift frequency the most according to claim 3 and Laser with External Dispersive compensate double frequency comb generating means, it is characterised in that:
Described dispersion compensation device A (15) and dispersion compensation device B (16) include grating to, prism to and dispersion compensating fiber.
F-P cavity parallel connection shift frequency the most according to claim 3 and Laser with External Dispersive compensate double frequency comb generating means, it is characterised in that:
Described electrooptic modulator A (13) and electrooptic modulator B (14) includes electro-optic intensity modulator and electro-optic phase modulator.
F-P cavity parallel connection shift frequency the most according to claim 3 and Laser with External Dispersive compensate double frequency comb generating means, it is characterised in that:
Described reference frequency oscillator (17) includes atomic clock, crystal oscillator, ceramic resonator, electronic oscillator.
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| CN110058217A (en) * | 2019-01-25 | 2019-07-26 | 北京航天计量测试技术研究所 | A kind of link air refraction real-time compensation distance measuring method altogether |
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