CN112864790B - 10mHz ultra-narrow linewidth laser and implementation method thereof - Google Patents
10mHz ultra-narrow linewidth laser and implementation method thereof Download PDFInfo
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- CN112864790B CN112864790B CN202110110297.7A CN202110110297A CN112864790B CN 112864790 B CN112864790 B CN 112864790B CN 202110110297 A CN202110110297 A CN 202110110297A CN 112864790 B CN112864790 B CN 112864790B
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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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
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
Abstract
The invention discloses a 10mHz extremely narrow linewidth laser and an implementation method thereof, wherein a grating-like velocity spectrum technology is applied to an optical clock of calcium atomic beams or ytterbium, cesium and other atomic beams to generate extremely narrow spectral lines, and then the extremely narrow spectral lines are fed back to the laser through a high-speed servo so as to realize the 10mHz extremely narrow linewidth laser. The 10mHz ultra-narrow linewidth laser comprises: the device comprises a 657nm laser, a beam splitter prism, an ultrastable optical reference cavity locking system, an acousto-optic modulator, an electro-optic modulator group, an atomic furnace, a permanent magnet group, a laser system, a photoelectric detector, a phase-locked amplifier, an acousto-optic modulator drive and high-speed servo feedback control circuit; the laser system adopts a 423nm laser system or a 431nm laser system. By adopting the technical scheme provided by the invention, the signal-to-noise ratio of the Lamssen spectral line can be improved by about 30 times compared with the traditional mode, and the laser frequency is stabilized to 10mHz magnitude.
Description
Technical Field
The invention belongs to the technical field of laser frequency stabilization, and relates to a 10mHz extremely narrow linewidth laser and an implementation method thereof.
Background
Ultrastable lasers have participated in the rapid development of fundamental physical research and advanced application techniques with their excellent frequency stability. For example, the great effect of the ultrastable laser on breaking through the traditional physical boundary is verified by the latest research progress of gravitational wave detection, ultralow phase noise microwave sources and the like.
At present, the most common realization method for realizing the ultrastable laser at the sub-hertz line width level is realized by locking the laser on an ultrastable optical resonant cavity, so that the short-term stability index of the ultrastable laser is good, but the long-term stability index is deteriorated, and the solution is to lock the ultrastable laser on an atomic spectral line to improve the long-term stabilityAnd (5) determining the degree. The optical clock (optical clock) realized by the method detects extremely narrow atomic transition spectral line by the pre-stabilized laser, and leads the optical clock to reach 10 which is unprecedented by combining the quantum state which is almost not interfered with and the laser with high phase coherence in the mode-19The measurement accuracy is such that the frequency becomes the most accurate physical measurement quantity. Optical clocks facilitate the redefinition of seconds in the optical domain, generalized relativistic inspection and monitoring of global potential dynamics based on clock networks. However, the optical clock realized by the technology has the disadvantages of complex structure, large volume and strict environmental requirements, can only operate in the environment of a laboratory, is difficult to carry and move, and is inconvenient to use.
Disclosure of Invention
The invention provides a 10mHz extremely narrow linewidth laser and an implementation method thereof, wherein a grating-like velocity spectrum technology is applied to a calcium atomic beam (or ytterbium, cesium and other atomic beams) optical clock to generate extremely narrow spectral lines, and then the extremely narrow spectral lines are fed back to the laser through high-speed servo so as to realize the 10mHz extremely narrow linewidth laser.
The invention provides a 10mHz extremely narrow linewidth laser, which comprises the following components: 657nm laser, beam splitter prism, ultrastable optical reference cavity locking system, acousto-optic modulator, electro-optic modulator group, calcium atomic furnace, permanent magnet group, laser system, photoelectric detector, phase-locked amplifier, acousto-optic modulator driver, and high-speed servo feedback control circuit. The spectrum of the laser is made to appear as a quasi-grating spectrum through modulation of a plurality of electro-optical modulators, calcium atoms are pumped, the atom utilization rate is improved, the Lam-plug spectral line with high signal-to-noise ratio is achieved, the spectral line is used for stabilizing the laser frequency, and therefore the laser with extremely narrow line width is achieved. The implementation method of the laser with extremely narrow line width is not limited to the calcium atomic beam optical clock, and can also be applied to other beam tube optical clocks such as ytterbium, cesium and other atomic beams. Under the condition of a calcium atomic beam optical clock, a 423nm laser system or a 431nm laser system can be adopted as the laser system.
The following takes a calcium atom beam optical clock as an example, 657nm is used for exciting calcium atoms; the beam splitter prism is used for splitting the laser into a reflected beam signal and a transmitted beam signal; the ultrastable optical reference cavity locking system is used for locking the 657nm laser; the phase-locked amplifier is used for generating a modulation signal and outputting the modulation signal to the acousto-optic modulator for driving; the acousto-optic modulator driver is used for applying a modulation signal to the acousto-optic modulator and driving the acousto-optic modulator; the acousto-optic modulator is used for modulating laser passing through the acousto-optic modulator and enabling the laser frequency locked on the ultra-stable optical reference cavity locking system to correspond to the atomic frequency; the electro-optical modulator group is used for displaying the laser spectrum into a grating-like type; the calcium atomic furnace is used for ejecting calcium atomic beams; a permanent magnet disposed at a path of the calcium atom beam for splitting a magnetic energy level of the calcium atom to utilize more calcium atoms; the permanent magnet is arranged near the laser system and used for generating a Hanler effect to increase the fluorescence detection intensity; the laser system is used for detecting to obtain a Lamssen spectrum atomic spectral line; the photoelectric detector is used for detecting a fluorescence signal emitted by an atom, converting the fluorescence signal into an electric signal with modulation information and outputting the electric signal to the phase-locked amplifier; the phase-locked amplifier is used for demodulating the electric signal with the modulation information, and the obtained error signal is transmitted to the high-speed servo feedback control circuit; the high-speed servo feedback control circuit is used for feedback control of the acousto-optic modulator drive to control the acousto-optic modulator, and further narrowing the laser line width.
Firstly, laser emitted by a 657nm laser is divided into two beams by a beam splitter prism, wherein a reflected beam signal is used for locking the laser on an ultrastable optical reference cavity locking system by using a traditional modulation-demodulation phase locking method, and a transmitted beam signal is used for subsequently detecting an atomic spectral line and realizing locking. Firstly, the modulation signal generated by the phase-locked amplifier is input to the acousto-optic modulator driver, and the acousto-optic modulator driver applies the modulation signal to the acousto-optic modulator. At the moment, after laser for detecting atomic spectral lines passes through the acousto-optic modulator, the laser carries modulation information, and meanwhile, the acousto-optic modulator is used for enabling the laser frequency locked on the ultrastable optical reference cavity locking system to correspond to the atomic frequency. And then laser with modulation information passes through an electro-optical modulator group, the electro-optical modulator group comprises three electro-optical modulators, the modulation frequencies are respectively 10MHz, 1MHz and 100kHz, the spectrum of the laser after passing through the electro-optical modulator group is shown to be similar to a grating type, and simultaneously, any sideband spectral lines are pure, coherent in phase and equidistant. Then, 657nm laser is applied to the calcium atom beam ejected from the calcium atom furnace, wherein a permanent magnet group is added on the calcium atom beam passing through, wherein, the permanent magnet near the 657nm laser aims to split the magnetic energy level of the calcium atoms so as to utilize more calcium atoms. While the permanent magnet near the 423nm laser system is used to create the hanler effect to increase the fluorescence detection intensity. And then, the 657nm laser passes through the lamb plug transition of the calcium atom beam excited atoms four times, and a 423nm laser system is used for detecting at the tail end of the atom beam to obtain a lamb plug spectral line, and because the small-hole diaphragm is not added like the traditional calcium beam tube, the atom beam is scattered, the spot size of the laser emitted by the 423nm laser system needs to be increased to utilize more atoms, and the signal-to-noise ratio of the obtained atom spectral line is improved. And finally, detecting a fluorescence signal emitted by the atom by a photoelectric detector. The photoelectric detector converts the fluorescent signal into an electric signal with modulation information, outputs the electric signal to the interior of the phase-locked amplifier for demodulation, demodulates an error signal and transmits the error signal to the high-speed servo feedback control circuit. And finally, the high-speed servo feedback control circuit controls the acousto-optic modulator to drive so as to control the acousto-optic modulator, the laser line width is further narrowed, and the laser with the line width of 10mHz is finally obtained.
The invention also provides a preparation method of the 10mHz extremely narrow linewidth laser, which comprises the steps of modulating the 657nm laser locked on the optical ultrastable reference cavity by a plurality of electro-optical modulators to enable the spectrum to be displayed as a quasi-grating spectrum, pumping calcium atoms, improving the atom utilization rate, realizing a Lambda-plug spectral line with high signal-to-noise ratio, and using the spectral line for laser frequency stabilization to realize the laser with extremely narrow linewidth. The method specifically comprises the following steps:
1) firstly, laser emitted by a 657nm laser is locked on an ultra-stable optical reference cavity by a modulation-demodulation phase locking method to realize pre-locking so as to narrow the laser line width in advance;
2) the laser then passes through an acousto-optic modulator, wherein the acousto-optic modulator generates a modulation signal by a phase-locked amplifier and outputs the modulation signal to an FM port of the acousto-optic modulator for modulation, and at the moment, the laser passing through the acousto-optic modulator carries modulation information, and the acousto-optic modulator is also used for enabling the frequency of the ultra-stable optical cavity to correspond to the atomic frequency. Then the signal passes through an electro-optical modulator group which consists of three electro-optical modulators, and the modulation frequencies are respectively 10MHz, 1MHz and 100 kHz. The spectrum of the laser passing through the electro-optical modulator group is shown as a quasi-grating spectrum, and meanwhile, the spectral lines of any sideband are pure, coherent in phase and equidistant;
3) the laser, which exhibited a spectrum as a grating-like spectrum, was passed four times over the calcium atom beam ejected from the calcium atomic furnace to excite the calcium atoms to produce a lamb-plug transition. And a permanent magnet group is added on a calcium atom beam of a 657nm laser path to split the magnetic energy level of calcium atoms, and the permanent magnet group near the laser emitted by a 423nm laser system is used for the Hanler effect to improve the fluorescence detection efficiency so as to improve the signal-to-noise ratio of the Lamanset spectral line. Then, the calcium atom spectral line is detected by 423nm laser transfer at the tail end of the atom beam, and a fluorescence signal emitted by calcium atoms is detected by a photoelectric detector and converted into an electric signal with modulation information. The 10mHz laser with extremely narrow linewidth is not limited to a calcium atomic beam clock, but can also be applied to other beam tube clocks such as ytterbium, cesium and other atomic beams.
4) And finally, the electric signal with the modulation information is input into a phase-locked amplifier to demodulate an error signal, the error signal is input into a high-speed servo feedback control circuit, and the high-speed servo feedback control circuit feeds back and adjusts the drive of the acousto-optic modulator to control the acousto-optic modulator, so that the laser line width is further narrowed, and the 10mHz line width laser is obtained.
Compared with the prior art, the invention has the following special technical and performance advantages:
the invention provides a 10mHz extremely narrow linewidth laser and an implementation method thereof, wherein a 657nm laser locked on an optical ultrastable reference cavity is innovatively modulated by a plurality of electro-optical modulators, the laser is modulated by the electro-optical modulators, so that the spectrum of the laser is shown as a grating-like spectrum, and therefore atomic beams of calcium, ytterbium, cesium and the like are pumped, the atom utilization rate is improved, and therefore a Lamm-plug spectral line with high signal-to-noise ratio is realized, and the spectral line is used for laser frequency stabilization, so that the laser with extremely narrow linewidth is realized. Through calculation, the laser prepared by the method can improve the signal-to-noise ratio of the Lamssen spectral line by about 30 times compared with the traditional mode, and stabilize the laser frequency to 10mHz magnitude.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a 10mHz ultra-narrow linewidth laser of the present invention;
wherein: the device comprises a 1-657nm laser, a 2-beam splitter prism, a 3-ultrastable optical reference cavity locking system, a 4-acousto-optic modulator, a 5-electro-optic modulator group, a 6-calcium atomic furnace, a 7-permanent magnet group, an 8-423nm laser system, a 9-photoelectric detector, a 10-phase-locked amplifier, an 11-acousto-optic modulator driver and a 12-high-speed servo feedback control circuit.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawing.
The invention provides a 10mHz extremely narrow linewidth laser and an implementation method thereof, wherein a grating-like velocity spectrum technology is applied to an atomic beam optical clock to generate extremely narrow spectral lines, and then the extremely narrow spectral lines are fed back to the laser through a high-speed servo so as to realize the 10mHz extremely narrow linewidth laser.
Referring to fig. 1, in the present embodiment, a 10mHz very narrow linewidth laser includes: the device comprises a 657nm laser 1, a beam splitter prism 2, an ultrastable optical reference cavity locking system 3, an acousto-optic modulator 4, an electro-optic modulator group 5, a calcium atomic furnace 6, a permanent magnet group 7, a 423nm laser system 8, a photoelectric detector 9, a phase-locked amplifier 10, an acousto-optic modulator driver 11 and a high-speed servo feedback control circuit 12. Laser emitted by a 657nm laser 1 is divided into two beams by a beam splitter prism 2, wherein reflected light is used for an ultrastable optical reference cavity locking system to lock the 657nm laser on an ultrastable optical reference cavity to realize pre-locking of the laser, and transmitted light is used for subsequent atomic spectral line detection and locking to further narrow the laser line width. The modulation signal generated by the lock-in amplifier 10 is supplied to the FM port of the acousto-optic modulator driver 11, and the acousto-optic modulator driver 11 applies the modulation signal to the acousto-optic modulator 4. At this time, after the laser for detecting the atomic spectral line passes through the acousto-optic modulator 4, the laser carries modulation information, and the acousto-optic modulator 4 is also used for corresponding the frequency of the ultrastable optical reference cavity to the atomic frequency. And then the laser with modulation information passes through an electro-optical modulator group 5, wherein the electro-optical modulator group comprises three electro-optical modulators, the modulation frequencies are respectively 10MHz, 1MHz and 100kHz, the spectrum of the laser after passing through the electro-optical modulator group 5 is shown to be of a similar grating type, and simultaneously, the spectral lines of any sideband are pure, coherent in phase and equidistant. Laser light is applied to the calcium atom beam emitted from the calcium atom furnace 6, wherein a permanent magnet group 7 is added where the 657nm laser light passes through the calcium atom beam in order to split the magnetic energy level of the calcium atoms to utilize more calcium atoms. The permanent magnet group 7 is added at the position of 423nm laser system passing calcium atoms to improve the detection efficiency of fluorescence signals by the Hanler effect. The laser is then passed four times through the calcium atom beam to obtain the lamb-plug line and the atom line is detected at the end of the atom beam with a 423nm laser system 8. Finally, the fluorescence signal emitted by the atom is detected by the photodetector 9. The photoelectric detector 9 converts the fluorescent signal into an electric signal with modulation information, outputs the electric signal to the phase-locked amplifier 10 for demodulation, demodulates an error signal and transmits the error signal to the high-speed servo feedback control circuit 12. And finally, the high-speed servo feedback control circuit 12 controls the acousto-optic modulator driver 11 in a feedback mode to control the acousto-optic modulator 4, and the laser line width is further narrowed, so that the laser with the line width of 10mHz is obtained.
The method for realizing the 10mHz extremely narrow linewidth laser provided by the invention is to modulate through a plurality of electro-optical modulators to enable the spectrum to be shown as a quasi-grating spectrum, so as to pump calcium atoms, improve the atom utilization rate and further realize a Lambda-Sessel spectral line with high signal-to-noise ratio, and apply the spectral line to laser frequency stabilization so as to realize the laser with extremely narrow linewidth. In addition, the invention is not limited to a 423nm laser system in a detection mode, can also be realized by a 431nm laser system, and can be applied to other beam tube optical clocks, not limited to calcium atomic beam optical clocks, and can also be realized by atomic beams such as ytterbium, cesium and the like. The specific numerical multiple of the modulation frequency of the electro-optical modulator group needs to be optimized according to specific system conditions and is not limited to data in specific implementation.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
Claims (8)
1. A 10mHz very narrow linewidth laser, comprising: the device comprises a 657nm laser, a beam splitter prism, an ultrastable optical reference cavity locking system, an acousto-optic modulator, an electro-optic modulator group, an atomic furnace, a permanent magnet group, a laser system, a photoelectric detector, a phase-locked amplifier, an acousto-optic modulator drive and high-speed servo feedback control circuit;
the 657nm laser is used for emitting laser; the beam splitter prism is used for splitting the laser into a reflected beam signal and a transmitted beam signal; the ultrastable optical reference cavity locking system is used for locking the reflected light beam signal; the phase-locked amplifier is used for generating a modulation signal and outputting the modulation signal to the acousto-optic modulator for driving; the acousto-optic modulator driver is used for applying a modulation signal to the acousto-optic modulator and driving the acousto-optic modulator; the acousto-optic modulator is used for modulating laser passing through the acousto-optic modulator and enabling the laser frequency locked on the ultra-stable optical reference cavity locking system to correspond to the atomic frequency; the electro-optical modulator group is used for displaying the laser spectrum into a grating-like type; the atomic furnace is used for ejecting atomic beams; permanent magnets placed at the path of the atom beam are used to split the magnetic energy level of the atoms to make use of more atoms; the permanent magnet is arranged near the laser system and used for generating a Hanler effect to increase the fluorescence detection intensity; the laser system is used for detecting 657nm laser passing through an atomic beam to obtain a Lamssen spectrum atomic spectral line; the photoelectric detector is used for detecting a fluorescence signal emitted by an atom, converting the fluorescence signal into an electric signal with modulation information and outputting the electric signal to the phase-locked amplifier; the phase-locked amplifier is used for demodulating the electric signal with the modulation information, and the obtained error signal is transmitted to the high-speed servo feedback control circuit; the high-speed servo feedback control circuit is used for feedback control of the drive of the acousto-optic modulator so as to control the acousto-optic modulator and further narrow the laser line width;
firstly, laser emitted by a 657nm laser is divided into two beams by a beam splitter prism, wherein a reflected beam signal is used for locking the laser on an ultrastable optical reference cavity locking system by using a traditional modulation-demodulation phase locking method, and a transmitted beam signal is used for subsequently detecting an atomic spectral line and realizing locking; the lock-in is carried out by inputting a modulation signal generated by the lock-in amplifier to an acousto-optic modulator driver, and the acousto-optic modulator driver adds the modulation signal to the acousto-optic modulator; when the laser for detecting the atomic spectral line passes through the acousto-optic modulator, the laser carries modulation information, and the acousto-optic modulator corresponds the laser frequency locked on the ultrastable optical reference cavity locking system to the atomic frequency; laser with modulation information passes through the electro-optical modulator group, the spectrum of the laser after passing through the electro-optical modulator group appears as a similar grating type, and meanwhile, spectral lines of any sideband are pure, coherent in phase and equidistant; then, 657nm laser is irradiated on an atomic beam ejected by a atomic furnace, wherein a permanent magnet group is added at the position where the atomic beam passes, and the permanent magnet group comprises a permanent magnet near the 657nm laser and a permanent magnet near a 423nm laser system; then 657nm laser passes through the lamb plug transition of atom beam excited atoms four times, and a 423nm laser system is used for detecting at the tail end of the atom beam to obtain a lamb plug spectral line; increasing the size of a light spot of laser emitted by a 423nm laser system; the photoelectric detector converts the fluorescent signal into an electric signal with modulation information, outputs the electric signal to the interior of the phase-locked amplifier for demodulation, demodulates an error signal and transmits the error signal to the high-speed servo feedback control circuit; and finally, the high-speed servo feedback control circuit controls the acousto-optic modulator to drive so as to control the acousto-optic modulator, the laser line width is further narrowed, and the laser with the line width of 10mHz is finally obtained.
2. The 10mHz very narrow linewidth laser of claim 1 wherein the set of electro-optic modulators includes a plurality of electro-optic modulators.
3. The 10mHz very narrow linewidth laser of claim 1 in which a permanent magnet in the vicinity of the 657nm laser in the set of permanent magnets is used to split the magnon level of the atom to utilize more atoms; a permanent magnet near the 423nm laser system was used to create the hanler effect to increase the fluorescence detection intensity.
4. A preparation method of a 10mHz extremely narrow linewidth laser comprises the steps that a 657nm laser locked on an optical ultrastable reference cavity is modulated through a plurality of electro-optical modulators, so that the spectrum of the laser is shown as a quasi-grating spectrum, atoms are pumped, the atom utilization rate is improved, a Lambda-plug spectral line with a high signal-to-noise ratio is realized, and the spectral line is used for laser frequency stabilization, so that the laser with extremely narrow linewidth is prepared; the method comprises the following steps:
1) laser is emitted by a 657nm laser, and is locked on an ultra-stable optical reference cavity by a modulation-demodulation phase locking method, so that the pre-locking is realized to narrow the laser line width in advance;
2) the laser passes through the acousto-optic modulator, and the laser passing through the acousto-optic modulator carries modulation information; then the laser passes through an electro-optical modulator group, the spectrum of the laser is shown as a quasi-grating spectrum, and meanwhile, the spectral lines of any sideband are pure, coherent in phase and equidistant;
3) enabling the laser with the spectrum shown as a grating-like spectrum to pass through an atomic beam ejected by an atomic furnace for four times, and exciting atoms to generate a lamb plug transition; adding a permanent magnet group on an atom beam of a 657nm laser path to split the magnetic energy level of atoms; then, transferring and detecting an atomic spectral line of the atom at the tail end of the atomic beam by 423nm laser, detecting a fluorescence signal emitted by the atom by a photoelectric detector, and converting the fluorescence signal into an electric signal with modulation information;
4) the electric signal with modulation information is input into a phase-locked amplifier to demodulate an error signal, the error signal is input into a high-speed servo feedback control circuit, the high-speed servo feedback control circuit feeds back and adjusts the drive of the acousto-optic modulator so as to control the acousto-optic modulator,
therefore, the laser line width is further narrowed, and the 10mHz line width laser is obtained.
5. The method as claimed in claim 4, wherein in step 2), the acousto-optic modulator generates a modulation signal from the lock-in amplifier, and the modulation signal is transmitted to the FM port of the acousto-optic modulator for modulation.
6. The method of claim 5, wherein the acousto-optic modulator maps the frequency of the ultrastable optical cavity to the atomic frequency.
7. The method of claim 4, wherein in step 2), the set of electro-optic modulators includes a plurality of electro-optic modulators.
8. The method of fabricating a 10mHz very narrow linewidth laser according to claim 4, wherein the method is applied to a calcium atomic beam optical clock, a ytterbium atomic beam optical clock, or a cesium atomic beam optical clock.
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| CN115016242B (en) * | 2022-05-19 | 2023-03-21 | 北京大学 | Atomic beam optical clock based on nanosecond pulse lamb stopcock spectrum and implementation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435018A (en) * | 1999-12-17 | 2003-08-06 | 康宁O.T.I股份公司 | Method and device for locking the wavelength of optical signal |
| CN108565671A (en) * | 2018-03-26 | 2018-09-21 | 中国工程物理研究院激光聚变研究中心 | A kind of mode locked fiber laser |
| CN110488594A (en) * | 2019-08-12 | 2019-11-22 | 浙江法拉第激光科技有限公司 | The small caesium clock of optical pumping and preparation method thereof based on Modulation Transfer spectrum Frequency Stabilized Lasers |
| CN110515291A (en) * | 2019-09-02 | 2019-11-29 | 温州激光与光电子协同创新中心 | The atomic beam light clock and its implementation of pulse wide range clock laser acquisition |
| CN110768097A (en) * | 2019-10-11 | 2020-02-07 | 温州激光与光电子协同创新中心 | Optical pumping rubidium atomic clock based on modulation transfer spectrum frequency stabilized laser and preparation method thereof |
| CN110783814A (en) * | 2019-10-28 | 2020-02-11 | 温州激光与光电子协同创新中心 | Small calcium atomic beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof |
| CN112034696A (en) * | 2019-06-04 | 2020-12-04 | 霍尼韦尔国际公司 | System and method for integrating optical atomic sensors |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190508B (en) * | 2019-05-27 | 2021-12-14 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Miniaturized narrow linewidth semiconductor laser |
-
2021
- 2021-01-26 CN CN202110110297.7A patent/CN112864790B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435018A (en) * | 1999-12-17 | 2003-08-06 | 康宁O.T.I股份公司 | Method and device for locking the wavelength of optical signal |
| CN108565671A (en) * | 2018-03-26 | 2018-09-21 | 中国工程物理研究院激光聚变研究中心 | A kind of mode locked fiber laser |
| CN112034696A (en) * | 2019-06-04 | 2020-12-04 | 霍尼韦尔国际公司 | System and method for integrating optical atomic sensors |
| CN110488594A (en) * | 2019-08-12 | 2019-11-22 | 浙江法拉第激光科技有限公司 | The small caesium clock of optical pumping and preparation method thereof based on Modulation Transfer spectrum Frequency Stabilized Lasers |
| CN110515291A (en) * | 2019-09-02 | 2019-11-29 | 温州激光与光电子协同创新中心 | The atomic beam light clock and its implementation of pulse wide range clock laser acquisition |
| CN110768097A (en) * | 2019-10-11 | 2020-02-07 | 温州激光与光电子协同创新中心 | Optical pumping rubidium atomic clock based on modulation transfer spectrum frequency stabilized laser and preparation method thereof |
| CN110783814A (en) * | 2019-10-28 | 2020-02-11 | 温州激光与光电子协同创新中心 | Small calcium atomic beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| Laser with 10-13 short-term instability for compact optically pumped cesium beam atomic clock;Haosen Shang;《Optics Express》;20200224;第28卷(第5期);全文 * |
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