CN109211414B - Ultrahigh-precision optical frequency tester and testing method thereof - Google Patents
Ultrahigh-precision optical frequency tester and testing method thereof Download PDFInfo
- Publication number
- CN109211414B CN109211414B CN201810767707.3A CN201810767707A CN109211414B CN 109211414 B CN109211414 B CN 109211414B CN 201810767707 A CN201810767707 A CN 201810767707A CN 109211414 B CN109211414 B CN 109211414B
- Authority
- CN
- China
- Prior art keywords
- frequency
- laser
- optical
- module
- comb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 146
- 238000012360 testing method Methods 0.000 title abstract description 9
- 230000035559 beat frequency Effects 0.000 claims abstract description 103
- 230000007704 transition Effects 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 63
- 239000000835 fiber Substances 0.000 claims description 52
- 238000001914 filtration Methods 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 244000126211 Hericium coralloides Species 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000000960 laser cooling Methods 0.000 claims description 6
- 238000000651 laser trapping Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000010009 beating Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 238000001228 spectrum Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 229910052769 Ytterbium Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical group [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical group [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- ICSAXRANXQSPQP-VUKDEKJYSA-M sodium;(5r,6s)-6-[(1r)-1-hydroxyethyl]-7-oxo-3-[(2r)-oxolan-2-yl]-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate Chemical compound [Na+].S([C@@H]1[C@H](C(N1C=1C([O-])=O)=O)[C@H](O)C)C=1[C@H]1CCCO1 ICSAXRANXQSPQP-VUKDEKJYSA-M 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical group [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
- G01J2009/0226—Fibres
Abstract
The invention discloses an ultra-high precision optical frequency tester and a test method thereof, the test method obtains narrow linewidth laser by locking laser emitted by a laser in an optical resonant cavity, and obtains an error signal after comparing with cold atom transition frequency so as to correct drift change of the narrow linewidth laser emitted by the laser along with the optical resonant cavity, thereby enabling the laser to emit ultra-stable laser with the same frequency as the cold atom transition frequency; then, the phase of the seed source pulse of the optical frequency comb is locked through a phase locking device, so that the high-stability output of the optical frequency comb is realized; and finally, performing beat frequency on the laser to be measured and the laser output by the optical frequency comb to obtain beat frequency signals of the two beams of light and the number of comb teeth of the optical frequency comb, so that the frequency of the laser to be measured can be calculated, and the accurate measurement of the frequency of the laser to be measured is realized. The invention has the advantages that: the tester has stable structure and ultrahigh precision, and the testing method can realize high-precision measurement of the optical frequency.
Description
Technical Field
The invention relates to the field of precision spectroscopy and precision measurement, in particular to an ultrahigh precision optical frequency tester and a testing method thereof.
Background
The development of science and technology needs to be based on the precision experimental measurement, and the light frequency is used as the measurement reference value to determine the accuracy and definition of other physical quantities. The accurate measurement of the optical frequency means the improvement of the measurement accuracy, not only provides a more precise time-frequency reference for the measurement of a plurality of basic physical constants, but also is beneficial to developing an atomic clock which takes a microwave quantum frequency standard as a core and can accurately time, improving the precision of a global positioning system and constructing an information highway. Today, with the development of information technology, research on high-accuracy frequency standards is an important content for relation to economic development, technological innovation and national security. .
The conventional method for measuring the laser wavelength is to use an optical wavelength measuring instrument to measure. The wavelength measuring instrument, i.e. a wavemeter, can be used for calibrating the output wavelength value of the tuned laser and is classified according to the measuring principle, and the wavemeter mainly has three types, namely a Fizeau interference type, a Fabry-Perot interference type, a Michelson interference type and the like. The resolution and measurement accuracy of the currently commonly used wavemeter is several MHz to several hundred MHz. If it is desired to increase the measurement accuracy of the laser frequency, e.g. in the order of Hz, even mHz, the measurement accuracy of the currently known wavemeters clearly differs considerably from the target requirement.
Disclosure of Invention
The invention aims to provide an ultra-high precision optical frequency tester and a testing method thereof according to the defects of the prior art, the testing method locks the laser emitted by the laser in the optical resonant cavity, and the laser is enabled to emit the ultrastable laser with the same frequency as the cold atom transition frequency by comparing with the cold atom transition frequency; then, the phase of the seed source pulse of the optical frequency comb is locked through a phase locking device, so that the high-stability output of the optical frequency comb is realized; and finally, performing beat frequency on the laser to be measured and the laser output by the optical frequency comb to obtain beat frequency signals of two beams of light and the comb teeth number of the optical frequency comb, thereby realizing the accurate measurement of the frequency of the laser to be measured.
The purpose of the invention is realized by the following technical scheme:
an ultra-high precision optical frequency tester is characterized by comprising an ultra-stable laser generating device, an optical frequency comb, a first beat frequency detection module and a frequency counting module; the ultrastable laser generating device comprises a laser, an optical resonant cavity, an acousto-optic modulator, a first servo feedback module, a second servo feedback module and a cold atom module, and the optical frequency comb comprises a mode-locked pulse optical fiber oscillator and a phase locking device; the laser is connected with the optical resonant cavity and forms feedback connection through the first servo feedback module, the laser, the acousto-optic modulator and the cold atom module are sequentially connected, and the acousto-optic modulator and the cold atom module also form feedback connection through the second servo feedback module; the mode-locked pulse fiber oscillator and the ultrastable laser generating device are respectively connected with the phase locking device; the optical frequency comb, the beat frequency detection module and the frequency counting module are sequentially connected.
The phase locking device comprises a repetition frequency locking device A and a carrier envelope phase drift frequency locking device B, wherein the repetition frequency locking device A comprises a frequency-selecting filtering module, a second beat frequency detection module, a first mixer and a third servo feedback module, and the carrier envelope phase drift frequency locking device B comprises an f-to-2f self-reference module, a third beat frequency detection module, a second mixer and a fourth servo feedback module; the mode-locked pulse fiber oscillator, the frequency-selective filtering module, the second beat frequency detection module and the first frequency mixer are sequentially connected, the second beat frequency detection module is further connected with the ultrastable laser generation device, the first frequency mixer is further connected with an external microwave reference source, and the first frequency mixer and the mode-locked pulse fiber oscillator form feedback connection through the third servo feedback module; the mode-locked pulse fiber oscillator, the f-to-2f self-reference module, the third beat frequency detection module and the second frequency mixer are sequentially connected, the second frequency mixer is also connected with the external microwave reference source, and the second frequency mixer and the mode-locked pulse fiber oscillator form feedback connection through a fourth servo feedback module; the f-to-2f self-reference module includes a frequency doubling crystal.
The phase locking device comprises a second beat frequency detection module, a first mixer, a second mixer and a third servo feedback module; the mode-locked pulse fiber oscillator, the second beat frequency detection module, the first mixer and the second mixer are sequentially connected, the second beat frequency detection module is further connected with the ultrastable laser generation device, the mode-locked pulse fiber oscillator is further connected with the first mixer, the second mixer is further connected with an external microwave reference source, and the second mixer and the mode-locked pulse fiber oscillator form feedback connection through a third servo feedback module.
The cold atom module comprises a laser cooling submodule and a laser trapping submodule, the laser cooling submodule is used for cooling atoms, and the laser trapping submodule is used for trapping the cold atoms in optical lattices formed by laser.
A test method related to any one of the ultra-high precision optical frequency testers is characterized in that the test method obtains narrow linewidth laser by locking laser emitted by a laser in an optical resonant cavity, and obtains an error signal after the narrow linewidth laser is compared with the transition frequency of cold atoms so as to correct the drift change of the narrow linewidth laser emitted by the laser along with the optical resonant cavity, so that the laser emits ultrastable laser with the same frequency as the transition frequency of the cold atoms; then, the phase of the seed source pulse of the optical frequency comb is locked through a phase locking device, so that the high-stability output of the optical frequency comb is realized; and finally, performing beat frequency on the laser to be measured and the laser output by the optical frequency comb to obtain beat frequency signals of two beams of light and the comb teeth number of the optical frequency comb, so that the frequency of the laser to be measured is obtained through calculation, and the accurate measurement of the frequency of the laser to be measured is realized.
The test method comprises the following steps:
laser output by the laser is subjected to phase modulation and is incident into the optical resonant cavity, after the laser interacts with the optical resonant cavity, reflected light is demodulated by a first servo feedback module to obtain an error signal and is fed back to a frequency executing mechanism of the laser, the output laser frequency is adjusted to be locked on the resonant frequency of the optical resonant cavity, and the noise and the line width of the locked compressed laser can obtain narrow line width laser with the line width lower than 1 Hz;
narrow-linewidth laser emitted by the laser is subjected to frequency modulation by using an acousto-optic modulator, then the narrow-linewidth laser is input into a cold atom module and is compared with cold atom transition frequency in the cold atom module, a second servo feedback module feeds back an obtained error signal to the acousto-optic modulator, and the change of the frequency of the narrow-linewidth laser emitted by the laser is corrected and the frequency of the narrow-linewidth laser and the cold atom transition frequency are guaranteed by adjusting the voltage of the acousto-optic modulatorIn agreement, i.e. the laser outputs ultrastable laser light at frequency fCW＝fAtomWherein f isAtomRepresents the cold atom transition frequency;
an optical fiber optical frequency comb is established by using a mode-locked pulse optical fiber oscillator as a seed source of the optical frequency comb, and the phase of the optical frequency comb seed source pulse is locked by using an external microwave reference source and ultrastable laser emitted by the laser through the phase locking device, so that the high-stability output of the optical frequency comb is realized;
beating the laser to be detected and the laser output by the optical frequency comb, extracting two paths of beat frequency lasers through an optical filtering device in a first beat frequency detection module, and acquiring a beat frequency signal f by using the first beat frequency detection modulebeatAnd simultaneously, reading out the comb tooth number M of the optical frequency comb which beats with the laser to be detected by a frequency counter, thereby calculating the frequency of the laser to be detected.
The specific steps of locking the phase of the optical frequency comb seed source pulse by the phase locking device are as follows: the laser emitted by the mode-locked pulse fiber oscillator passes through the frequency-selecting filtering module to select light with a wavelength corresponding to the ultrastable laser emitted by the laser, the light is subjected to beat frequency with the ultrastable laser, and a beat frequency signal f acquired by a second beat frequency detection module1The signal transmitted by the external microwave reference source and the signal are input into a first mixer together, an error signal is obtained through a third servo feedback module and fed back to the mode-locked pulse fiber oscillator, and the locking of the repetition frequency of the optical frequency comb is realized; the frequency of the transmission comb teeth of the mode-locked pulse optical fiber oscillator is vN＝Nfrep+fCEOThe light with low frequency and long wavelength is obtained from the reference module through the f-to-2f module with the frequency of 2vN＝2Nfrep+2fCEOFrequency-doubled light with v as its corresponding frequency2N＝2Nfrep+fCEOThe high-frequency short-wavelength light is subjected to beat frequency, a difference frequency signal in the high-frequency short-wavelength light is obtained through a third beat frequency detection module, and the difference frequency signal is a carrier envelope offset frequency fCEOI.e. zero frequency, willAnd the zero-frequency signal and a signal transmitted by an external microwave reference source are input into a second mixer together, and an error signal is obtained through a fourth servo feedback module and fed back to the mode-locked pulse optical fiber oscillator, so that the zero-frequency locking of the optical frequency comb is realized. The repetition frequency is calculated as:
in the formula frepTo the repetition frequency, fAtomIs the cold atom transition frequency and N is the comb tooth number of the optical frequency comb.
The specific steps of locking the phase of the optical frequency comb seed source pulse by the phase locking device are as follows: the laser emitted by the mode-locked pulse optical fiber oscillator and the ultrastable laser emitted by the laser carry out beat frequency, and a beat frequency signal f is obtained through a second beat frequency detection module1Then the frequency of the ultrastable laser of said laser can be expressed as fAtom＝Nfrep+f1+fCEOI.e. f1＝fAtom-Nfrep-fCEOUsing a first mixer to mix f1And zero frequency signal fCEOMixing to obtain beat frequency signal f2Then f is2＝fAtom-NfrepAnd then f is mixed by a second mixer2And mixing with a signal transmitted by an external microwave reference source, obtaining an error signal through a third servo feedback module, feeding the error signal back to the mode-locked pulse fiber oscillator, and locking the repetition frequency of the optical frequency comb, so that an expression that the repetition frequency is irrelevant to zero frequency can be obtained: f. ofAtom-NfrepIs equal to 0, i.e
The frequency calculation formula of the laser to be measured is as follows:
in the formula (f)LaserRepresenting the laser frequency to be measured, M being the lightThe number of comb teeth of the frequency-learning comb.
The frequency calculation formula of the laser to be measured is as follows:
in the formula (f)LaserAnd representing the laser frequency to be measured, wherein M is the comb tooth number of the optical frequency comb.
The invention has the advantages that:
(1) the laser emitted by the laser is locked on the optical resonant cavity, so that the noise and the line width of the laser can be compressed, the laser with the line width lower than 1Hz is output by the laser, and the output laser has higher stability;
(2) the transition frequency of the laser emitted by the laser and the transition frequency of the cold atoms are compared, so that the frequency of the laser output by the laser is consistent with the transition frequency of the cold atoms, the precision is high, and errors generated by the change of the cavity length of the optical resonant cavity can be corrected;
(3) the laser oscillator in the optical frequency comb seed source adopts an optical fiber structure, has the advantages of small volume, good anti-interference performance, high integration degree and the like compared with a solid laser, and ensures the high precision of the optical frequency comb by performing repeated frequency locking and zero frequency locking on the optical frequency comb through an external microwave reference source and ultrastable laser.
Drawings
Fig. 1 is a schematic structural diagram of an ultrastable laser generator in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of an optical frequency comb in embodiment 1 of the present invention;
fig. 3 is a schematic view of measuring a laser to be measured in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a frequency stabilization process of the ultrastable laser generator in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of the locking process of the repetition frequency and the zero frequency of the optical frequency comb in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of an optical frequency comb in embodiment 2 of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-6, the labels 1-30 in the figures are: the laser device comprises a laser 1, an optical resonant cavity 2, an acousto-optic modulator 3, a first servo feedback module 4, a second servo feedback module 5, a cold atom module 6, a mode-locked pulse fiber oscillator 7, a repetition frequency locking device 8, a carrier envelope phase drift frequency locking device 9, a frequency-selective filtering module 10, a second beat frequency detection module 11, a first mixer 12, a third servo feedback module 13, an external microwave reference source 14, an f-to-2f self-reference module 15, a third beat frequency detection module 16, a second mixer 17, a fourth servo feedback module 18, an optical frequency comb 19, a laser to be detected 20, a first beat frequency detection module 21, a frequency counting module 22, a reflector 23, a photoelectric detector 24, a 976nm pump source 25A, a 976nm pump source 25B, a 976nm pump source 25C, a mixing device 26, a coupler 27A, a coupler 27B, a, A polarization controller 28, an electro-optic modulator 29, and a piezoelectric ceramic 30.
Example 1: as shown in fig. 1-5, the present embodiment specifically relates to an ultra-high precision optical frequency tester and a testing method thereof, the ultra-high precision optical frequency tester in the present embodiment includes an ultra-stable laser generating device, an optical frequency comb 19, a first beat frequency detection module 21 and a frequency counter 22, and the testing method locks the laser emitted from the laser 1 in the optical resonant cavity 2, and compares the laser with the transition frequency of cold atoms to make the laser 1 emit ultra-stable laser with the same frequency as the transition frequency of the cold atoms; then, the phase of the seed source pulse of the optical frequency comb 19 is locked through a phase locking device, so that the high-stability output of the optical frequency comb 19 is realized; and finally, performing beat frequency on the laser 20 to be measured and the laser output by the optical frequency comb 19 to obtain beat frequency signals of two beams of light and the number of comb teeth of the optical frequency comb 19, thereby realizing accurate measurement of the frequency of the laser 20 to be measured.
As shown in fig. 1, the ultrastable laser generating device includes a laser 1, an optical resonant cavity 2, an acousto-optic modulator 3, a first servo feedback module 4, a second servo feedback module 5 and a cold atom module 6, wherein the laser 1 is optically connected with the optical resonant cavity 2 and forms feedback connection through the first servo feedback module 4, the laser 1, the acousto-optic modulator 3 and the cold atom module 6 are sequentially connected, and the acousto-optic modulator 3 and the cold atom module 6 also form feedback connection through the second servo feedback module 5. The optical resonant cavity 2 has ultrahigh fineness, also called as (F-P cavity), can select light with certain frequency and consistent direction as the most preferred amplification, and inhibit light with other frequencies and directions, the characteristic frequency can be used as the reference frequency of laser frequency stabilization, and the laser frequency stabilization technology based on the optical resonant cavity 2 has the advantages of good frequency discrimination characteristic, no dependence on light intensity, high signal-to-noise ratio and the like, can greatly narrow the line width of laser, and improves the short-term stability of laser frequency; the cold atom module 6 comprises a laser cooling submodule and a laser trapping submodule, wherein the laser cooling submodule moves in a pair of laser beams which have a frequency slightly lower than the transition energy level difference of atoms and are propagated in opposite directions, the atoms are cooled down to form cold atoms due to the Doppler effect, the laser required for cooling down the atoms is called cooling laser, the frequency of the cooling laser is determined according to the transition energy level of the atoms used in the laser cooling submodule, and the laser trapping submodule forms a periodic mesh potential well by utilizing mutual interference of a plurality of laser beams, so that the cooled down cold atoms are loaded in the laser trapping submodule, and the cold atoms can be strontium atoms, ytterbium atoms, mercury atoms and the like.
As shown in fig. 2, the optical frequency comb 19 comprises a mode-locked pulse fiber oscillator 7 and a phase locking device comprising a repetition frequency locking device 8 and a carrier envelope phase drift frequency locking device 9. The mode-locked pulse fiber oscillator 7 is an optical fiber oscillator which uses rare earth element doped fiber as a gain medium and realizes ultrashort pulse laser output by a mode-locking technology, the mode-locking mode can be semiconductor saturable absorber mirror mode-locking (SESAM), nonlinear ring magnifier mode-locking (NALM) or nonlinear polarization rotation mode-locking (NPR), and the output ultrashort pulse interval is repetition frequency and is used for locking the optical frequency comb 19. The repetition frequency locking device 8 comprises a frequency-selecting filtering module 10, a second beat frequency detection module 11, a first frequency mixer 12 and a third servo feedback module 13, the mode-locked pulse fiber oscillator 7, the frequency-selecting filtering module 10, the second beat frequency detection module 11 and the first frequency mixer 12 are sequentially connected, the second beat frequency detection module 11 is further connected with the laser 1, the first frequency mixer 12 is further connected with an external microwave reference source 14, and the first frequency mixer 12 and the mode-locked pulse fiber oscillator 7 form feedback connection through the third servo feedback module 13; the frequency-selective filtering module 10 includes a grating and an optical filter, the grating can separate the spectrum output by the mode-locked pulse fiber oscillator 7, the optical filter can filter out the light wave with a specific frequency, and the second beat frequency detection module 11 includes a focusing lens and an avalanche optical detector, and can detect the beat frequency light wave. The carrier envelope phase drift frequency locking device 9 comprises an f-to-2f self-reference module 15, a third beat frequency detection module 16, a second mixer 17 and a fourth servo feedback module 18, the mode-locked pulse fiber oscillator 7, the f-to-2f self-reference module 15, the third beat frequency detection module 16 and the second mixer 17 are sequentially connected, the second mixer 17 is further connected with an external microwave reference source 14, and feedback connection is formed between the second mixer 17 and the mode-locked pulse fiber oscillator 7 through the fourth servo feedback module 18; the third beat frequency detection module 16 and the second beat frequency detection module 11 have the same structure and function, the f-to-2f self-reference module 15 can perform frequency doubling on the laser by using a frequency doubling crystal, and the external microwave reference source 14 is a high-accuracy and high-stability oscillator using an electromagnetic wave radiated during atomic transition as a reference, and may be a hydrogen clock, a cesium clock, a rubidium clock, or the like.
As shown in fig. 3, the optical frequency comb 19, the first beat frequency detection module 21, and the frequency counting module 22 are sequentially connected, the first beat frequency detection module 21 is further connected to the laser 20 to be detected, the first beat frequency detection module 21, the second beat frequency detection module 11, and the third beat frequency detection module 16 have the same structure and function, and the frequency counting module 22 can read the number of teeth of the optical frequency comb 19.
As shown in fig. 1 to 3, the testing method of the ultra-high precision optical frequency tester in the present embodiment is as follows:
(1) laser reference-to-atom transition frequency generated by ultrastable laser device
Firstly, laser generated by a laser 1 is incident into an optical resonant cavity 2 after being subjected to phase modulation, and is reflected back through a reflector 23 after interacting with the optical resonant cavity 2 and is detected by a photoelectric detector 24, the photoelectric detector 24 transmits a detected signal to a first servo feedback module 4 for demodulation, so that an error signal (the amplitude of the error signal is in direct proportion to the detuning amount of the laser frequency relative to the resonant frequency of the optical resonant cavity 2) for frequency locking is obtained, the error signal is filtered and amplified in the first servo feedback module 4 and then is fed back to a frequency executing mechanism of the laser 1 to compensate the laser frequency, so that the laser frequency is locked on the resonant frequency of the optical resonant cavity 2, and then the noise and the line width of the laser are further compressed, so that the laser with the line width lower than 1Hz can be obtained.
Then, on the basis of obtaining laser with the line width lower than 1Hz, the laser emitted by the laser 1 is subjected to frequency modulation through the acousto-optic modulator 3, and inputs the laser light subjected to the frequency modulation into the cold atom module 6 through the optical fiber, compares the modulated laser light with the transition frequency of the atoms used in the cold atom module 6, and an error signal is obtained by the detection of the photoelectric detector 24, the error signal is sent into the second servo feedback module 5, filtered and amplified and then fed back to the acousto-optic modulator 3, the acousto-optic modulator 3 corrects the change of the output ultrastable laser frequency by changing the voltage of the acousto-optic modulator 3, meanwhile, the ultra-stable narrow linewidth laser output after frequency modulation is ensured to keep resonance with the atomic transition laser in the cold atomic module 6, so that the laser generated by the ultrastable laser device is referenced to the atomic transition frequency, i.e. the frequency f of the laser output by the ultrastable laser device.CW＝fAtomWherein f isAtomIndicating the atomic transition frequency.
(2) Phase locking of optical frequency comb 19 using laser light generated by an ultrastable laser device
The carrier of the ultrashort pulse generated by the mode-locked pulse fiber oscillator 7 in the optical frequency comb 19 is composed of a single frequency light, which forms a vertical line on the spectrum as if the comb teeth of the comb, whose frequency can be expressed as: v. ofN＝Nfrep+fCEOWherein N is the number of teeth of the optical frequency comb 19, frepReferred to as repetition frequency, fCEOReferred to as the carrier envelope phase drift frequency, also referred to as the zero frequency. The phase locking of the optical frequency comb 19, i.e. the locking of the repetition frequency and the zero frequency, is mainly achieved by the repetition frequency locking means 8 and the carrier envelope phase drift frequency locking means 9.
The mode-locked pulse fiber oscillator 7 inputs a wide spectrum of one octave to the frequency-selecting filtering module 10, the grating therein is used for separating the spectrum, then the light with the wavelength corresponding to the ultrastable laser generated by the ultrastable laser device is filtered out by the optical filter, and the beat frequency is carried out on the light and the laser output by the laser 1 of the ultrastable laser device, the second beat frequency detection module 11 carries out beat frequency detection on the detected beat frequency signal f1The reference wave output by an external microwave reference source 14 is input into a first mixer 12 for mixing, and an error signal is processed and fed back to a mode-locked pulse fiber oscillator 7 through a third servo feedback module 13 so as to lock the repetition frequency; the other beam of light wave output by the mode-locked pulse fiber oscillator 7 is input into the f-to-2f self-reference module 15, and the f-to-2f self-reference module 15 multiplies the frequency of the low-frequency long-wavelength light by using the frequency doubling crystal therein to obtain frequency doubled light 2vN＝2Nfrep+2fCEOThen the frequency doubling light and the corresponding light v with high frequency and short wavelength are used2N＝2Nfrep+fCEOThe beat frequency is carried out, and the third beat frequency detection module 16 detects the beat frequency signal to obtain the zero frequency fCEOThen, the zero frequency signal is sent to the second mixer 17 to be mixed with the external microwave reference source 14, and the error signal is processed and fed back to the mode-locked pulse fiber oscillator 7 through the fourth servo feedback module 18 to change the current of the pump source in the resonant cavity to lock the zero frequency. The repetition frequency f of the optical frequency comb 19 is thus obtainedrepThe expression of (c), namely:
(3) measurement of the frequency of the laser 20 to be measured
Beating the laser 20 to be measured and the optical frequency comb 19 which has completed phase locking, andthe beat frequency signal f is obtained by the detection of the first beat frequency detection module 21beatIf the frequency counting module 22 is used to obtain the number M of comb teeth of the optical frequency comb 19, the frequency f of the laser 20 to be measuredLaserThe calculation formula of (2) is as follows:
thereby completing the measurement of the frequency of the laser light 20 to be measured using the ultra-high precision optical frequency tester.
As shown in fig. 4 and 5, in this embodiment, the frequency of the laser 20 to be tested is measured by using the tester and the test method, specifically taking the neutral atom ytterbium as the cold atom, and the specific steps are as follows:
(1) firstly, 1156nm laser (namely fundamental frequency light) emitted by a laser 1 which is preset to generate 578nm laser is emitted into an optical resonant cavity 2, a photoelectric detector 24 acquires a reflected light signal and feeds an error signal back to a frequency executing mechanism of the laser 1 through a first servo feedback module 4 to compensate the laser frequency, and the noise and the line width of the laser are further compressed to obtain narrow line width laser with the line width lower than 1 Hz; because the cavity length of the optical resonant cavity 2 changes with time due to the influence of environmental factors such as temperature, and the frequency of the output laser is unstable, in order to obtain the ultrastable laser, the laser needs to be frequency-modulated by the acousto-optic modulator 3 and then input into the cold atom module 6 to be used with the cold ytterbium atom1S0-3P0The transition frequencies are compared, the photoelectric detector 24 feeds back the detected error signal to the acousto-optic modulator 3 through the second servo feedback module 5, the acousto-optic modulator 3 corrects the change of the output ultrastable laser frequency caused by the cavity length change of the optical resonant cavity 2 by changing the internal voltage of the acousto-optic modulator 3, and meanwhile, the ultrastable narrow linewidth laser output after frequency modulation and the cold ytterbium atom in the cold atom module 6 are ensured1S0-3P0The transition frequency is kept in resonance, so that the laser generated by the ultrastable laser device is referenced to the cold ytterbium atom1S0-3P0Transition frequency, i.e. frequency of laser light output by ultrastable laser device
Wherein f isYbDenotes the cold ytterbium atom1S0-3P0The frequency of the transition.
(2) The mode-locked pulse fiber oscillator 7 comprises a 976nm pump source 25A, a 976nm pump source 25B and a 976nm pump source 25C which are coupled and connected through a coupler 27A and a coupler 27B, and erbium-doped fibers are used as gain media on a connection light path to amplify the passing optical signals, and a polarization controller 28 is used for controlling the resonant frequency of a resonant cavity in the mode-locked pulse fiber oscillator 7; one path of laser generated by the mode-locked pulse fiber oscillator 7 is input to the f-to-2f self-reference module 15, and the frequency of the optical comb is multiplied by using a frequency multiplication crystal therein to obtain frequency-multiplied light 2vN＝2Nfrep+2fCEOThen the frequency doubling light and the corresponding light v with high frequency and short wavelength are used2N＝2Nfrep+2fCEOThe beat frequency is carried out, and the third beat frequency detection module 16 detects the beat frequency signal to obtain the zero frequency fCEOThen, the zero frequency signal is sent into a second mixer 17 to be mixed with an external microwave reference source 14 (a 10MHz hydrogen clock reference source is selected here), and an error signal is processed and fed back to a 976nm pump source 25A in the mode-locked pulse fiber oscillator 7 through a fourth servo feedback module 18, and the 976nm pump source 25A adjusts the internal current to lock the zero frequency; the other path of laser generated by the mode-locked pulse fiber oscillator 7 is input into the frequency-selective filtering module 10 to select a spectrum with the central wavelength of 1550nm, frequency doubling is performed by using a frequency doubling crystal, the spectrum is broadened to 550nm-1050nm through a high nonlinear fiber, then the spectrum and 578nm laser generated by the ultrastable laser generating device are subjected to beat frequency, and a beat frequency signal f detected by the second beat frequency detection module 111The signal is transmitted to a first mixer 12 to be mixed with an external microwave reference source 14 (a 10MHz hydrogen clock reference source is selected here), and a processed error signal is fed back to an electro-optical modulator 29 in a mode-locked pulse fiber oscillator 7 through a third servo feedback module 13 and is fed back to a piezoelectric ceramic 30 to adjust the cavity length to realize the repetition frequency frepLocking of (2). Then can obtain：
f378＝vN＝Nfrep+f1+fCEO
The repetition frequency f of the optical frequency comb 19 is thus obtainedrepThe expression of (c), namely:
(3) measurement of the frequency of the laser 20 to be measured
The laser 20 to be detected and the optical frequency comb 19 which has completed phase locking are subjected to beat frequency, and a beat frequency signal f is obtained through detection of the first beat frequency detection modulebeatIf the frequency counting module 22 is used to obtain the number M of comb teeth of the optical frequency comb 19, the frequency f of the laser 20 to be measuredLaserThe calculation formula of (2) is as follows:
thereby completing the measurement of the frequency of the laser light 20 to be measured using the ultra-high precision optical frequency tester.
The beneficial effect of this embodiment is: (1) the laser emitted by the laser is locked on the optical resonant cavity, so that the noise and the line width of the laser can be compressed, the laser with the line width lower than 1Hz is output by the laser, and the output laser has higher stability; (2) the transition frequency of the laser emitted by the laser and the transition frequency of the cold atoms are compared, so that the frequency of the laser output by the laser is consistent with the transition frequency of the cold atoms, the precision is high, and errors generated by the change of the cavity length of the optical resonant cavity can be corrected; (3) the laser oscillator in the optical frequency comb seed source adopts an optical fiber structure, has the advantages of small volume, good anti-interference performance, high integration degree and the like compared with a solid laser, and ensures the high precision of the optical frequency comb by performing repeated frequency locking and zero frequency locking on the optical frequency comb through an external microwave reference source and ultrastable laser.
Example 2: as shown in fig. 6, the difference between this embodiment and embodiment 1 lies in the structure of the phase locking device of the optical frequency comb 19, specifically, the phase locking device in this embodiment includes a second beat frequency detection module 11, a first mixer 12, a second mixer 17 and a third servo feedback module 13, the mode-locked pulse fiber oscillator 7, the second beat frequency detection module 11, the first mixer 12 and the second mixer 17 are connected in sequence, the second beat frequency detection module 11 is further connected to the laser 1, the second mixer 17 is further connected to an external microwave reference source 14, and the second mixer 17 and the mode-locked pulse fiber oscillator 7 form a feedback connection through the third servo feedback module 13.
The repetition frequency f of the optical frequency comb 19 is realized by the phase locking device in this embodimentrepThe principle of locking is as follows: the laser generated by the mode-locked pulse fiber oscillator 7 and the ultrastable laser emitted by the laser 1 are subjected to beat frequency, and a beat frequency signal f is obtained by the detection of the second beat frequency detection module 111Then the ultrastable laser output by the laser 1 at this time can be represented as fArom＝Nfrep+f1+fCEONamely: f. of1＝fAtom-Nfrep-fCEOThen the beat signal f is processed1Mixing with the laser output by the mode-locked pulse fiber oscillator 7 by a first mixer 12 to obtain a beat frequency signal f2＝fAtom-NfrepThen, at this time, the zero frequency signal is removed, and finally, the beat frequency signal f is obtained2The frequency is input into a second mixer 17 to be mixed with an external microwave reference source 14, and a third servo feedback module 13 feeds an error signal obtained by mixing back to the mode-locked pulse fiber oscillator 7 to lock the repetition frequency of the optical frequency comb 19, so that the repetition frequency f can be obtainedrepZero-frequency independent expression:
fAtom-Nfrepis equal to 0, i.e
When the ultrahigh-precision optical frequency tester of the embodiment is used for measuring the frequency of the laser 20 to be measured, the laser 20 to be measured and the optical frequency comb 19 which has completed phase locking are subjected to beat frequency, and a beat frequency signal f is obtained by detecting through the first beat frequency detection module 21beatAcquisition of light using the frequency counting module 22The number M of comb teeth of the frequency comb 19 is the frequency f of the laser 20 to be measuredLaserThe calculation formula of (2) is as follows:
Claims (8)
1. an ultra-high precision optical frequency tester is characterized by comprising an ultra-stable laser generating device, an optical frequency comb, a first beat frequency detection module and a frequency counting module; the ultrastable laser generating device comprises a laser, an optical resonant cavity, an acousto-optic modulator, a first servo feedback module, a second servo feedback module and a cold atom module, and the optical frequency comb comprises a mode-locked pulse optical fiber oscillator and a phase locking device; the laser is connected with the optical resonant cavity and forms feedback connection through the first servo feedback module, the laser, the acousto-optic modulator and the cold atom module are sequentially connected, and the acousto-optic modulator and the cold atom module also form feedback connection through the second servo feedback module; the mode-locked pulse fiber oscillator and the ultrastable laser generating device are respectively connected with the phase locking device; the optical frequency comb, the first beat frequency detection module and the frequency counting module are sequentially connected; the phase locking device is one of the following:
(1) the phase locking device comprises a repetition frequency locking device A and a carrier envelope phase drift frequency locking device B, wherein the repetition frequency locking device A comprises a frequency-selecting filtering module, a second beat frequency detection module, a first mixer and a third servo feedback module, and the carrier envelope phase drift frequency locking device B comprises an f-to-2f self-reference module, a third beat frequency detection module, a second mixer and a fourth servo feedback module; the mode-locked pulse fiber oscillator, the frequency-selective filtering module, the second beat frequency detection module and the first frequency mixer are sequentially connected, the second beat frequency detection module is further connected with the ultrastable laser generation device, the first frequency mixer is further connected with an external microwave reference source, and the first frequency mixer and the mode-locked pulse fiber oscillator form feedback connection through the third servo feedback module; the mode-locked pulse fiber oscillator, the f-to-2f self-reference module, the third beat frequency detection module and the second frequency mixer are sequentially connected, the second frequency mixer is also connected with the external microwave reference source, and the second frequency mixer and the mode-locked pulse fiber oscillator form feedback connection through a fourth servo feedback module; the f-to-2f self-reference module comprises a frequency doubling crystal;
(2) the phase locking device comprises a second beat frequency detection module, a first mixer, a second mixer and a third servo feedback module; the mode-locked pulse fiber oscillator, the second beat frequency detection module, the first mixer and the second mixer are sequentially connected, the second beat frequency detection module is further connected with the ultrastable laser generation device, the mode-locked pulse fiber oscillator is further connected with the first mixer, the second mixer is further connected with an external microwave reference source, and the second mixer and the mode-locked pulse fiber oscillator form feedback connection through a third servo feedback module.
2. The ultra-high precision optical frequency tester as claimed in claim 1, wherein the cold atom module comprises a laser cooling sub-module for cooling atoms and a laser trapping sub-module for trapping cold atoms in an optical cell formed by a laser.
3. A test method related to the ultra-high precision optical frequency tester as claimed in any one of claims 1-2, wherein the test method obtains narrow linewidth laser by locking laser emitted from a laser in an optical resonant cavity, and obtains an error signal after comparing with transition frequency of cold atoms to correct drift variation of the narrow linewidth laser emitted from the laser with the optical resonant cavity, so that the laser emits ultra-stable laser with the same frequency as the transition frequency of the cold atoms; then, the phase of the seed source pulse of the optical frequency comb is locked through a phase locking device, so that the high-stability output of the optical frequency comb is realized; and finally, performing beat frequency on the laser to be measured and the laser output by the optical frequency comb to obtain beat frequency signals of two beams of light and the comb teeth number of the optical frequency comb, so that the frequency of the laser to be measured is obtained through calculation, and the accurate measurement of the frequency of the laser to be measured is realized.
4. The method as claimed in claim 3, wherein the method comprises the steps of:
laser output by the laser is subjected to phase modulation and is incident into the optical resonant cavity, after the laser interacts with the optical resonant cavity, reflected light is demodulated by a first servo feedback module to obtain an error signal and is fed back to a frequency executing mechanism of the laser, the output laser frequency is adjusted to be locked on the resonant frequency of the optical resonant cavity, and the noise and the line width of the locked compressed laser can obtain narrow line width laser with the line width lower than 1 Hz;
narrow-linewidth laser emitted by the laser is subjected to frequency modulation by using an acousto-optic modulator, then the narrow-linewidth laser is input into a cold atom module and is compared with cold atom transition frequency in the cold atom module, a second servo feedback module feeds back an obtained error signal to the acousto-optic modulator, the voltage of the acousto-optic modulator is adjusted to correct the change of the frequency of the narrow-linewidth laser emitted by the laser and ensure that the frequency of the narrow-linewidth laser is consistent with that of the cold atom transition frequency, namely the laser can output ultrastable laser, and the frequency of the ultrastable laser is
Wherein
Represents the cold atom transition frequency;
an optical fiber optical frequency comb is established by using a mode-locked pulse optical fiber oscillator as a seed source of the optical frequency comb, and the phase of the optical frequency comb seed source pulse is locked by using an external microwave reference source and ultrastable laser emitted by the laser through the phase locking device, so that the high-stability output of the optical frequency comb is realized;
beating the laser to be detected and the laser output by the optical frequency comb, extracting two paths of beat frequency lasers through an optical filter device in a first beat frequency detection module, and acquiring beat frequency signals by using the first beat frequency detection module
And simultaneously reading out the comb tooth number M of the optical frequency comb which beats with the laser to be detected by a frequency counting module, thereby calculating the frequency of the laser to be detected.
5. The method as claimed in claim 4, wherein the step of locking the phase of the optical frequency comb seed pulse by the phase locking device (1) comprises: the laser emitted by the mode-locked pulse fiber oscillator passes through the frequency-selecting filtering module to select light with a wavelength corresponding to the ultrastable laser emitted by the laser, the light is subjected to beat frequency with the ultrastable laser, and beat frequency signals acquired by the second beat frequency detection module
The signal transmitted by the external microwave reference source and the signal are input into a first mixer together, an error signal is obtained through a third servo feedback module and fed back to the mode-locked pulse fiber oscillator, and the locking of the repetition frequency of the optical frequency comb is realized; the mode-locked pulse fiber oscillator has the transmission comb frequency of
The low-frequency long-wavelength light is obtained from the reference module through the f-to-2f module at the frequency of
Frequency-doubled light, and mixing the frequency-doubled light with the lightCorresponding to a frequency of
The high-frequency short-wavelength light is subjected to beat frequency, a difference frequency signal in the high-frequency short-wavelength light is obtained through a third beat frequency detection module, and the difference frequency signal is a carrier envelope offset frequency
Namely zero frequency, inputting a zero frequency signal and a signal transmitted by an external microwave reference source into a second mixer together, acquiring an error signal through a fourth servo feedback module and feeding the error signal back to the mode-locked pulse fiber oscillator to realize zero frequency locking of the optical frequency comb; the repetition frequency is calculated as:
in the formula
In order to be able to repeat the frequency,
is the cold atom transition frequency and N is the comb tooth number of the optical frequency comb.
6. The method as claimed in claim 4, wherein the step of locking the phase of the optical frequency comb seed pulse by the phase locking device (2) comprises: the laser emitted by the mode-locked pulse fiber oscillator and the ultrastable laser emitted by the laser carry out beat frequency, and beat frequency signals are obtained through a second beat frequency detection module
Then the frequency of the ultrastable laser of the laser can be expressed as
I.e. by
In the formula
In order to be able to repeat the frequency,
is the cold atom transition frequency, and N is the number of comb teeth of the optical frequency comb; using a first mixer to mix
And zero frequency signal
Mixing to obtain beat frequency signal
Then, then
Then use the second mixer to mix
And mixing with a signal transmitted by an external microwave reference source, obtaining an error signal through a third servo feedback module, feeding the error signal back to the mode-locked pulse fiber oscillator, and locking the repetition frequency of the optical frequency comb, so that an expression that the repetition frequency is irrelevant to zero frequency can be obtained:
i.e. by
。
7. The method as claimed in claim 5, wherein the frequency of the laser to be measured is calculated by the following formula:
in the formula (I), the compound is shown in the specification,
and representing the laser frequency to be measured, wherein M is the comb tooth number of the optical frequency comb.
8. The method as claimed in claim 6, wherein the frequency of the laser to be measured is calculated by the following formula:
in the formula (I), the compound is shown in the specification,
and representing the laser frequency to be measured, wherein M is the comb tooth number of the optical frequency comb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810767707.3A CN109211414B (en) | 2018-07-13 | 2018-07-13 | Ultrahigh-precision optical frequency tester and testing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810767707.3A CN109211414B (en) | 2018-07-13 | 2018-07-13 | Ultrahigh-precision optical frequency tester and testing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109211414A CN109211414A (en) | 2019-01-15 |
| CN109211414B true CN109211414B (en) | 2020-10-16 |
Family
ID=64990418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810767707.3A Active CN109211414B (en) | 2018-07-13 | 2018-07-13 | Ultrahigh-precision optical frequency tester and testing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109211414B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111900982B (en) * | 2020-06-08 | 2022-08-23 | 北京无线电计量测试研究所 | Ultra-long free evolution time cold atom frequency standard device and method |
| CN112928590B (en) * | 2021-01-30 | 2022-03-22 | 杭州微伽量子科技有限公司 | Laser frequency locking method, system and light source |
| CN114167709B (en) * | 2021-06-30 | 2023-02-10 | 成都天奥电子股份有限公司 | Optical frequency atomic clock implementation method based on microcavity optical comb |
| CN114354057B (en) * | 2022-01-05 | 2023-03-24 | 华东师范大学 | Sensing device and method for precisely measuring pressure intensity of cold atom vacuum system |
| CN114963995B (en) * | 2022-04-14 | 2023-05-02 | 北京大学 | Michelson laser, implementation method thereof and displacement measurement method |
| CN115061353B (en) * | 2022-07-04 | 2024-03-19 | 北京大学 | Fountain type optical clock and implementation method thereof |
| CN115865079B (en) * | 2022-11-22 | 2023-08-01 | 复旦大学 | High-precision phase difference measuring device and method for main clock link and standby clock link |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001076026A1 (en) * | 2000-03-30 | 2001-10-11 | National Institute Of Standards And Technology ('nist') | Mode-locked pulsed laser system and method |
| JP2012004426A (en) * | 2010-06-18 | 2012-01-05 | Mitsutoyo Corp | Unmodulated stabilization laser device |
| CN102981345A (en) * | 2012-11-30 | 2013-03-20 | 广东汉唐量子光电科技有限公司 | Method for acquiring high-power broadband green-light optical frequency comb |
| CN103904546A (en) * | 2014-04-03 | 2014-07-02 | 上海朗研光电科技有限公司 | Method and device for monitoring and controlling high-precision optical fiber optical frequency comb |
| CN104316180A (en) * | 2014-11-02 | 2015-01-28 | 华东师范大学 | Double-optical frequency comb optical imaging method based on continuous frequency stabilized laser |
| CN107024285A (en) * | 2017-04-28 | 2017-08-08 | 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 |
| CN107389208A (en) * | 2017-08-10 | 2017-11-24 | 中国计量科学研究院 | A kind of apparatus and method for measuring cold atom interference gravimeter laser frequency |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI336771B (en) * | 2007-10-16 | 2011-02-01 | Ind Tech Res Inst | Optical frequency measurement method and apparatus |
| CN102243106B (en) * | 2011-04-06 | 2013-01-02 | 中国航空工业集团公司北京长城计量测试技术研究所 | Frequency-beating device for laser frequency measurement |
| CN103292918B (en) * | 2012-03-02 | 2015-07-29 | 中国计量科学研究院 | Phase place measure of the change system |
| US9097656B2 (en) * | 2012-03-29 | 2015-08-04 | Imra America, Inc. | Methods for precision optical frequency synthesis and molecular detection |
| US8981273B2 (en) * | 2012-09-13 | 2015-03-17 | Ram Photonics, LLC | Optical frequency tracking and stabilization based on extra-cavity frequency |
| CN103001114A (en) * | 2012-11-16 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | Method for generating high repetition frequency optical frequency comb |
| CN103424194B (en) * | 2013-08-13 | 2015-12-09 | 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 measuring method of frequency stability of femtosecond laser frequency comb and device |
| CN103794980B (en) * | 2014-01-27 | 2016-08-17 | 华东师范大学 | Method and the device thereof of light frequency is measured with high-power fiber optical frequency com |
| CN104316186B (en) * | 2014-07-07 | 2016-08-24 | 华东师范大学 | A kind of spectral measurement method of optically-based frequency comb |
| US9429473B2 (en) * | 2014-10-16 | 2016-08-30 | Joseph R. Demers | Terahertz spectrometer and method for reducing photomixing interference pattern |
| CN105548036B (en) * | 2015-12-08 | 2018-04-06 | 上海理工大学 | A kind of adaptive double light comb spectroscopic systems |
| CN105428987B (en) * | 2016-01-05 | 2018-09-28 | 华东师范大学 | High power ultra-short pulse optical frequency comb generation method based on self similarity amplifier |
| CN106019763B (en) * | 2016-05-10 | 2018-10-16 | 西北大学 | A kind of locking device of all -fiber continuous light and optical frequency com |
| CN205642620U (en) * | 2016-05-11 | 2016-10-12 | 上海朗研光电科技有限公司 | Terahertz of self -adaptation compensation is bare comb spectrum appearance now |
| CN105823559B (en) * | 2016-05-11 | 2017-11-10 | 上海朗研光电科技有限公司 | A kind of adaptive double light comb spectrally compensating method for extracting signal |
| CN106025779A (en) * | 2016-07-22 | 2016-10-12 | 华东师范大学 | Astronomical optical frequency comb system based on harmonic mode-locked fiber laser device |
| US10533836B2 (en) * | 2016-09-15 | 2020-01-14 | The Regents Of The University Of Michigan | Multidimensional coherent spectroscopy using frequency combs |
| EP3327411A1 (en) * | 2016-11-28 | 2018-05-30 | Airbus Defence and Space GmbH | Optical system |
-
2018
- 2018-07-13 CN CN201810767707.3A patent/CN109211414B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001076026A1 (en) * | 2000-03-30 | 2001-10-11 | National Institute Of Standards And Technology ('nist') | Mode-locked pulsed laser system and method |
| JP2012004426A (en) * | 2010-06-18 | 2012-01-05 | Mitsutoyo Corp | Unmodulated stabilization laser device |
| CN102981345A (en) * | 2012-11-30 | 2013-03-20 | 广东汉唐量子光电科技有限公司 | Method for acquiring high-power broadband green-light optical frequency comb |
| CN103904546A (en) * | 2014-04-03 | 2014-07-02 | 上海朗研光电科技有限公司 | Method and device for monitoring and controlling high-precision optical fiber optical frequency comb |
| CN104316180A (en) * | 2014-11-02 | 2015-01-28 | 华东师范大学 | Double-optical frequency comb optical imaging method based on continuous frequency stabilized laser |
| CN107024285A (en) * | 2017-04-28 | 2017-08-08 | 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 |
| CN107389208A (en) * | 2017-08-10 | 2017-11-24 | 中国计量科学研究院 | A kind of apparatus and method for measuring cold atom interference gravimeter laser frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109211414A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109211414B (en) | Ultrahigh-precision optical frequency tester and testing method thereof | |
| CN110401492B (en) | Radio amplitude modulation signal receiving method based on quantum effect and amplitude modulation quantum receiver | |
| US6654394B1 (en) | Laser frequency stabilizer using transient spectral hole burning | |
| Ferrari et al. | Precision frequency measurement of visible intercombination lines of strontium | |
| Nevsky et al. | Frequency comparison and absolute frequency measurement of I 2-stabilized lasers at 532 nm | |
| CN109029740B (en) | Device and method for measuring atomic hyperfine structure | |
| EP2629381A1 (en) | Precision photonic oscillator and method for generating an ultra-stable frequency reference using a two-photon rubidium transition | |
| Ye et al. | Ultrastable optical frequency reference at 1.064/spl mu/m using a C/sub 2/HD molecular overtone transition | |
| Bertinetto et al. | Frequency stabilization of DBR diode laser against Cs absorption lines at 852 nm using the modulation transfer method | |
| Terra et al. | An ultra-stable optical frequency standard for telecommunication purposes based upon the 5S 1/2→ 5D 5/2 two-photon transition in Rubidium | |
| Glaser et al. | Absolute frequency measurement of rubidium 5 S− 6 P transitions | |
| Newman et al. | Photonic integration of an optical atomic clock | |
| US7068360B2 (en) | Optical sampling waveform measuring apparatus | |
| Lipphardt et al. | The stability of an optical clock laser transferred to the interrogation oscillator for a Cs fountain | |
| Diddams et al. | Direct RF to optical frequency measurements with a femtosecond laser comb | |
| Czajkowski et al. | Development and study of a 1.5 μm optical frequency standard referenced to the P (16) saturated absorption line in the (ν1+ ν3) overtone band of 13C2H2 | |
| Golovizin et al. | Ultrastable Laser System for Spectroscopy of the 1.14 μ m Inner-Shell Clock Transition in Tm and Its Absolute Frequency Measurement | |
| Kliese et al. | Difference-frequency combs in cold atom physics | |
| RU2318278C1 (en) | Method and device for stabilizing laser frequency | |
| Grieser et al. | Precision measurement of two iodine lines at 585 nm and 549 nm | |
| Bodermann et al. | Precise frequency measurements of lines in the near infrared by Rb reference lines | |
| Jones et al. | Intercombination line frequencies in 171 Yb validated with the clock transition | |
| Zhou et al. | Digital long-term laser frequency stabilization with an optical frequency comb | |
| Loh et al. | A Brillouin Laser Optical Atomic Clock | |
| Frunder et al. | CARS spectrometer with cw intra‐cavity excitation for high‐resolution Raman spectroscopy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |