CN112578660B - Fountain clock light detection device based on cage structure and adjustment method - Google Patents
Fountain clock light detection device based on cage structure and adjustment method Download PDFInfo
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- CN112578660B CN112578660B CN202011515424.3A CN202011515424A CN112578660B CN 112578660 B CN112578660 B CN 112578660B CN 202011515424 A CN202011515424 A CN 202011515424A CN 112578660 B CN112578660 B CN 112578660B
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- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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Abstract
The invention provides a fountain clock light detection device based on a cage structure, which comprises the cage structure, an adapter and a fastener, wherein the cage structure is arranged on a fountain clock detection cavity and comprises an upper light detection cage structure and a lower light detection cage structure; the fastener is used for fixing the upper and lower detection light cage structures; the adapter is used for fixing the cage structure on the fountain clock detection cavity, and detection light/heavy pump light introduced through the polarization-maintaining optical fiber in the cage structure sequentially passes through the optical fiber flange plate, the polarization beam splitter, the collimating lens, the rectangular light intercepting part, the non-polarization beam splitter, the zero-order 1/2 wave plate, the fountain clock detection cavity and the reflector to be reflected to form a standing wave field. The invention also provides a fountain clock detection light adjusting method based on the cage structure. The fountain clock light detection device based on the cage structure is adopted, so that the fountain clock upper and lower light detection devices are insensitive to environmental vibration, the carrying capacity is high, and the adjustment and maintenance are reduced.
Description
Technical Field
The invention relates to the technical field of detection light systems, in particular to a fountain clock detection light device based on a cage structure and an adjusting method.
Background
The fountain clock is a frequency standard device for realizing atomic transition frequency recurrence, and generally determines the difference between the frequency of a frequency source signal and the atomic transition frequency by detecting the atomic state distribution condition on the upper and lower energy levels of atomic hyperfine structure energy level transition so as to realize the locking of the frequency source signal to the atomic transition frequency. A traditional fountain clock light detection device is characterized in that an upper light detection light path and a lower light detection light path are built on an optical flat plate and fixed on a fountain clock frame.
The traditional fountain clock light detection device has the problems of large volume, loose structure and other components, the used optical element installation and adjustment mechanism has magnetism, so that an upper detection light path and a lower detection light path cannot be physically connected with a fountain clock detection cavity, and the central axis of a light through hole of the detection cavity is difficult to align with the central axis of the upper detection light and the lower detection light, so that the efficiency of fluorescence detection collection is influenced.
Therefore, there is a need in the art to develop a light detecting device that can overcome the above-mentioned problems in the prior art.
Disclosure of Invention
The invention aims to provide a fountain clock light detection device based on a cage structure, which can solve the technical problems that the conventional fountain clock light detection device is large in size and loose in structure, and the central axis of a light through hole of a detection cavity is difficult to align with the central axes of upper and lower detection light, so that the efficiency of fluorescence collection is influenced.
The invention also aims to provide a fountain clock detection light adjusting method based on the cage structure, which can solve the technical problems that the conventional fountain clock detection light device is large in size and loose in structure, and the central axis of a light through hole of a detection cavity is difficult to align with the central axes of upper and lower detection lights, so that the collection efficiency of detection fluorescence is influenced.
The invention provides a fountain clock light detection device based on a cage structure, which comprises the cage structure, an adapter and a fastener,
the cage structure is arranged on the fountain clock detection cavity and comprises an upper detection light cage structure and a lower detection light cage structure;
the fastener is used for fixing the upper detection light cage structure and the lower detection light cage structure;
the adaptor is used for fixing the cage structure on the fountain clock detection cavity, and the cage structure and the adaptor are provided with light through holes coaxial with the light window of the fountain clock detection cavity;
in the upper detection light cage structure, detection light introduced by the polarization-maintaining optical fiber sequentially passes through an optical fiber flange plate, a polarization beam splitter, a collimating lens, a rectangular light intercepting part, a 50:50 non-polarization beam splitter, a zero-order 1/2 wave plate, a fountain clock detection cavity and a reflector, and is reflected to form an upper detection light standing wave field;
in the lower detection light cage structure, heavy pump light introduced through the polarization maintaining optical fiber sequentially passes through an optical fiber flange plate, a polarization beam splitter, a collimating lens, a rectangular light intercepting part, a 10:90 non-polarization beam splitter, a zero-order 1/2 wave plate, a fountain clock detection cavity and a reflector which are arranged on the lower detection light cage structure, and is reflected to form a lower detection light standing wave field.
Preferably, eight fixed screw holes needed by the upper detection light cage structure and the lower detection light cage structure respectively are uniformly distributed around the light through hole by taking four fixed screw holes as a group.
Preferably, the cage structure is fixed on two sides of the light-passing area of the fountain clock detection cavity through the two adapters.
Preferably, each adapter is fixed on the fountain clock detection cavity through four M6 screws.
Preferably, 16 struts of 6mm diameter required by the cage structure are fixed on the fixing screw holes around the light through hole on the adaptor.
Preferably, the diameter of the two light through holes on the fountain clock detection cavity is 25mm, and the center distance is 50 mm.
Preferably, the M6 screw and the strut are made of titanium metal.
Preferably, the adapter is made of non-magnetic hard aluminum.
Preferably, the cage structure uses 8 struts each having a length of 250mm and 100mm respectively.
The invention also provides a fountain clock detection light adjusting method based on the cage structure, which comprises the following steps:
rotating the fixed angle of the upper detection light cage type structure optical fiber flange plate to enable the transmitted optical power of the polarization spectroscope to be maximum;
the collimating lens is axially adjusted in a sliding manner along the upper detection light cage structure, so that the collimation of the detection light output by the optical fiber is realized;
inserting a rectangular light-cutting piece to cut out rectangular detection light;
rotating the 50:50 non-polarization spectroscope to ensure that the reflected detection light is vertical to the upper detection light cage structure in the axial direction;
adjusting a reflector of the upper detection light cage structure to form an upper detection light standing wave field;
according to a fluorescence signal detected on the fountain clock, a zero-order 1/2 wave plate of the upper detection light cage structure is rotationally adjusted, and an atomic fluorescence signal is optimized;
rotating a 10:90 non-polarization beam splitter of the lower detection light cage structure to enable lower detection light reflected and split from the upper detection light cage structure to be coaxial with a central shaft of the lower detection light cage structure;
adjusting a reflector of the lower detection light cage structure to enable lower detection light to form a lower detection light standing wave field in the lower detection light cage structure;
rotating the fixed angle of the lower detection light cage structure optical fiber flange plate to ensure that the light power of the heavy pump light transmitted by the polarization spectroscope is maximum;
the collimating lens is adjusted in an axial sliding mode along the lower detection light cage structure, and collimation of the optical fiber output heavy pump light is achieved;
inserting a rectangular light-cutting piece to cut out rectangular heavy pump light;
adjusting the XY directions of the fixing piece of the optical fiber flange plate of the lower detection light cage structure to ensure that heavy pump light and lower detection light are superposed in the lower detection light cage structure;
and (3) rotationally adjusting a zero-order 1/2 wave plate of the lower detection light cage structure according to the detection fluorescent signal on the fountain clock, and optimizing the atomic fluorescent signal.
Compared with the prior art, the fountain clock light detection device based on the cage structure and the adjusting method have the following beneficial effects:
1. according to the invention, the central axis of the light through hole of the detection cavity is aligned with the central axes of the upper detection light and the lower detection light through the upper detection light cage structure and the upper detection light cage structure, so that the efficiency of detecting fluorescence collection is improved, and the consistency and the stability of the upper detection efficiency and the lower detection efficiency are ensured.
2. According to the invention, the upper and lower detection light cage structures are fixed on the fountain clock detection cavity through the adapter, and then the upper and lower detection light cage structures are fixed together through the fastener, so that the structural rigidity of the upper and lower detection light cage structures at two ends of the fountain clock detection cavity can be ensured.
3. By adopting the fountain clock light detection device based on the cage structure, the fountain clock upper and lower light detection devices are not sensitive to environmental vibration, the carrying capability is strong, the fountain clock light detection device can be ensured to continuously operate for a long time, and the adjustment and maintenance are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fountain clock light detection device based on a cage structure;
FIG. 2 is a schematic structural diagram of cage-structured supporting rods of the cage-structured light detection device of the fountain clock based on the cage structure;
FIG. 3 is a schematic structural diagram of an adapter of the fountain clock light detection device based on the cage structure;
FIG. 4 is a schematic structural diagram of a rectangular light-intercepting member of the fountain clock light-detecting device based on the cage structure;
fig. 5 is a schematic structural diagram of a fastener of the fountain clock light detection device based on the cage structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, the fountain clock light detection device based on the cage structure provided by the present invention includes a cage structure, an adaptor 2, and fasteners 601 and 602, the cage structure is disposed on the fountain clock detection chamber 1, and the cage structure includes an upper light detection cage structure and a lower light detection cage structure; the fasteners 601 and 602 are used for fixing the upper detection light cage structure and the lower detection light cage structure; the adaptor 2 is used for fixing the cage structure on the fountain clock detection cavity 1, and the cage structure and the adaptor 2 are provided with light through holes coaxial with the light window of the fountain clock detection cavity 1. It can be seen from fig. 1 that upper and lower detection light cage structures composed of an adapter 2 and cage structure supporting rods 3 are installed on two sides of a fountain clock detection cavity 1.
By adopting the fountain clock light detection device based on the cage structure, the fountain clock upper and lower light detection devices are not sensitive to environmental vibration, the carrying capability is strong, the fountain clock light detection device can be ensured to continuously operate for a long time, and the adjustment and maintenance are reduced.
As shown in fig. 1, in the upper detection light cage structure, detection light introduced through the polarization maintaining fiber sequentially passes through a fiber flange, a polarization beam splitter 501, a collimating lens 701, a rectangular light intercepting member 801 (shown in fig. 4), a 50:50 non-polarization beam splitter 901 (a transmission part), a zero-order 1/2 wave plate 1001, a fountain clock detection cavity 1 and a reflector 1101, and is reflected to form an upper detection light standing wave field; in the lower detection light cage structure, heavy pump light introduced through the polarization-maintaining optical fiber sequentially passes through an optical fiber flange plate, a polarization beam splitter 502, a collimating lens 702, a rectangular light-intercepting piece 802, a 10:90 non-polarization beam splitter 902 (taking a transmission part, 10%), a zero-order 1/2 wave plate 1002, a fountain clock detection cavity 1 and a reflector 1102, and is reflected to form a lower detection light standing wave field.
50% of lower detection light split by the reflection of the 50:50 non-polarizing beam splitter 901 in the upper detection light cage structure is reflected to the 10:90 non-polarizing mirror 902 of the lower detection light cage structure, wherein 90% of the lower detection light is reflected again and is superposed with the re-pumping light in the lower detection light cage structure to jointly form a lower detection light standing wave field.
Specifically, the probe light introduced by the polarization maintaining fiber is accessed through the fiber flange on the XY direction translation adjusting seat 401, and a divergent light beam is output. After passing through the polarization beam splitter 501, the polarization direction of the transmitted light is cured, and the polarization direction of the detection light after passing through the PBS (polarization beam splitter) is ensured not to change along with the polarization jitter of the output light of the polarization maintaining fiber. The collimating lens 701 collimates the outgoing beam of the fiber to form a collimated beam with a diameter of 23 mm. The rectangular light-intercepting member 801 intercepts the collimated light beam in a size of 16mm in width and 8mm in height, and forms a rectangular light beam required for detecting an atomic state. The 50:50 non-polarizing beamsplitter 901 splits the rectangular beam into two portions, one portion being transmitted for use as upper probe light and the other portion being reflected downward into the lower probe cage for use as lower probe light. After passing through a zero-order 1/2 wave plate 1001, the upper detection light passes through the fountain clock detection cavity 1 and is incident on a reflector 1101, and the upper detection light is reflected to form an upper detection light standing wave field. Rotating the wave plate 1001 may optimize atom detection efficiency. The heavy pump light introduced by the polarization maintaining fiber is accessed through the fiber flange on the XY direction translation adjusting seat 402, and after passing through the polarization beam splitter 502, the collimation of the emergent light beam of the fiber is realized by the collimating lens 702, and the rectangular collimated light beam is intercepted by the rectangular intercepting part 802. After passing through a 10:90 non-polarizing beam splitter 902, the re-pumping light and the lower detection light are combined to detect atoms at a transition lower energy level of the hyperfine structure. The optical wave passes through the detection cavity 1 after passing through a zero-order 1/2 wave plate 1002, and is reflected by a reflector 1102 to form a lower detection optical standing wave field.
In fig. 1, a standard 30mm distance is adopted between an upper detection light cage structure and a lower detection light cage structure, a fiber flange is installed on standard XY direction translation adjusting seats 401 and 402, polarization beam splitters 501 and 502 are installed on standard cage adapter seats, collimating lenses 701 and 702 are installed on standard cage adapter seats, 50:50 non-polarization beam splitter 901 and 10:90 non-polarization beam splitter 902 are respectively installed on the modified standard cage adapter seats, zero-order 1/2 wave plates 1001 and 1002 are installed on the standard cage adapter seats, and reflectors 1101 and 1102 are installed on the standard cage adapter seats.
The diameter of two light through holes on the fountain clock detection cavity 1 is 25mm, and the center distance is 50 mm.
As shown in fig. 1, the eight fixing screw holes required by the upper detection light cage structure and the lower detection light cage structure are uniformly distributed around the light through hole by taking four fixing screw holes as a group.
Fig. 2 is a schematic structural diagram of cage-structured supporting rods 3 of the fountain clock light detection device based on the cage structure, and as shown in fig. 1 and 2, 16 supporting rods 3 with the diameter of 6mm required by the cage structure are fixed on fixing screw holes around the light through holes on the adapter 2. Preferably, the cage structure uses 8 struts 3 each having a length of 250mm and 100mm respectively. This cage structure branch 3 adopts the titanium metal material, can guarantee like this not have magnetism and mechanical strength. Two ends of the supporting rod 3 are non-magnetic brass screws. Cage structure branch 3 of different length passes through the brass screw rod to be fixed respectively on two adaptor 2, forms the layout and surveys the cage structure of light in the upper and lower detection of fountain clock exploration cavity 1 both sides.
Fig. 3 is a schematic structural diagram of an adapter 2 of a fountain clock light detection device based on a cage structure, as shown in fig. 3, each adapter 2 is fixed on a detection light passing area of a detection cavity of a fountain clock through four M6 screws, two light passing holes on the adapter 2 are 25mm in diameter, the center distance is 50mm, and the center height and the distance between the two light passing holes are consistent with the center height and the distance between an upper fluorescence collection lens and a lower fluorescence collection lens of a fluorescence collection system of the detection area of the fountain clock. The adapter 2 is made of nonmagnetic hard aluminum material, and the size parameters are designed according to the size parameters of the detection cavity of the fountain clock. As shown in fig. 1, the cage structure of the present invention is fixed on both sides of the light transmission area of the detection cavity of the fountain clock through two adapters 2.
The M6 screw is made of titanium metal, so that the structural strength is guaranteed, and the magnetism of a device is also guaranteed.
Preferably, the adapter 2 is made of non-magnetic duralumin.
Fig. 5 is a schematic structural diagram of a fastener of the fountain clock light detection device based on the cage structure. In fig. 1, it can be seen that fasteners 601 and 602 are installed on the upper detection light cage structure and the lower detection light cage structure in a bridging manner, so that the upper detection light cage structure and the lower detection light cage structure are fixed into a whole, the overall strength of the upper detection light cage structure and the lower detection light cage structure is increased, the structural rigidity is ensured, and the stability is improved. As shown in FIG. 5, the two light-passing holes on the fasteners 601 and 602 are both 25mm in diameter and 50mm apart from each other. 4 pieces of 8 through-holes of 6mm that 30mm cage structure required are a set of equipartition respectively around two clear holes. Each through hole is connected with a non-magnetic fastening screw to realize the fastening connection of the fastener 601 or 602 and the cage-type structure support rod 3.
The invention also provides a fountain clock detection light adjusting method based on the cage structure, which comprises the following steps:
rotating the fixed angle of the upper detection light cage type structure optical fiber flange plate to enable the transmitted optical power of the polarization spectroscope to be maximum;
the collimating lens is axially adjusted in a sliding manner along the upper detection light cage structure, so that the collimation of the detection light output by the optical fiber is realized;
inserting a rectangular light-cutting piece to cut out rectangular detection light;
rotating the 50:50 non-polarization spectroscope to ensure that the reflected detection light is vertical to the upper detection light cage structure in the axial direction;
adjusting a reflector of the upper detection light cage structure to form an upper detection light standing wave field;
according to the fluorescent signal detected on the fountain clock, the 1/2 wave plate of the upper detection light cage structure is rotationally adjusted, and the atomic fluorescent signal is optimized;
rotating a 10:90 non-polarization beam splitter of the lower detection light cage structure to enable the lower detection light reflected and split from the upper detection light cage structure to be coaxial with the central axis of the lower detection light cage structure;
adjusting a reflector of the lower detection light cage structure to enable the lower detection light to form a lower detection light standing wave field in the lower detection light cage structure;
rotating the fixed angle of the lower detection light cage structure optical fiber flange plate to ensure that the light power of the heavy pump light transmitted by the polarization spectroscope is maximum;
the collimating lens is adjusted by sliding along the axial direction of the lower detection light cage structure, so that the collimation of the optical fiber output heavy pump light is realized;
inserting a rectangular light-cutting piece to cut out rectangular heavy pump light;
adjusting the XY directions of the fixing piece of the fiber flange plate of the lower detection light cage structure to ensure that the heavy pump light and the lower detection light are superposed in the lower detection light cage structure;
according to the fluorescent signal detected on the fountain clock, the lower detection light cage type structure 1/2 wave plate is rotationally adjusted, and the atomic fluorescent signal is optimized.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A fountain clock light detection device based on a cage structure is characterized by comprising the cage structure, a connector and a fastener,
the cage structure is arranged on the fountain clock detection cavity and comprises an upper detection light cage structure and a lower detection light cage structure;
the fastener is used for fixing the upper detection light cage structure and the lower detection light cage structure;
the adaptor is used for fixing the cage structure on the fountain clock detection cavity, and the cage structure and the adaptor are provided with light through holes coaxial with the light window of the fountain clock detection cavity;
in the upper detection light cage structure, detection light introduced by the polarization-maintaining optical fiber sequentially passes through an optical fiber flange plate, a polarization beam splitter, a collimating lens, a rectangular light intercepting part, a 50:50 non-polarization beam splitter, a zero-order 1/2 wave plate, a fountain clock detection cavity and a reflector, and is reflected to form an upper detection light standing wave field;
in the lower detection light cage structure, heavy pump light introduced through the polarization maintaining optical fiber sequentially passes through an optical fiber flange plate, a polarization beam splitter, a collimating lens, a rectangular light intercepting part, a 10:90 non-polarization beam splitter, a zero-order 1/2 wave plate, a fountain clock detection cavity and a reflector which are arranged on the lower detection light cage structure, and is reflected to form a lower detection light standing wave field.
2. The fountain clock light detection device of claim 1, wherein the eight fixing screw holes required for the upper and lower light detection cage structures are uniformly distributed around the light through hole in groups of four.
3. The fountain clock light detection device based on the cage structure of claim 1, wherein the cage structure is fixed on both sides of the light passing area of the fountain clock detection cavity through two adapters.
4. The fountain clock light detection apparatus of claim 3, wherein each of the adapters is secured to the fountain clock detection chamber by four M6 screws.
5. The fountain clock light detection device of claim 4, wherein 16 support rods of 6mm diameter required by the cage structure are fixed to the fixing screw holes around the light through hole of the adaptor.
6. The light detection device of a fountain clock based on a cage structure of claim 1, wherein the two light passing holes of the detection cavity of the fountain clock have a diameter of 25mm and a center-to-center distance of 50 mm.
7. The fountain clock light detection device of claim 5, wherein the M6 screw and the support bar are made of titanium.
8. The fountain clock light detection device of claim 1, wherein the adapter is made of non-magnetic duralumin.
9. A fountain clock light detection apparatus according to claim 5, in which 8 struts each having a length of 250mm and 100mm are used in the cage.
10. The method for adjusting the detection light of the fountain clock based on the cage-type structure detection light device of the fountain clock according to claim 1, comprising the steps of:
rotating the fixed angle of the upper detection light cage type structure optical fiber flange plate to enable the transmitted optical power of the polarization spectroscope to be maximum;
the collimating lens is axially adjusted in a sliding manner along the upper detection light cage structure, so that the collimation of the detection light output by the optical fiber is realized;
inserting a rectangular light-cutting piece to cut out rectangular detection light;
rotating the 50:50 non-polarization spectroscope to ensure that the reflected detection light is vertical to the upper detection light cage structure in the axial direction;
adjusting a reflector of the upper detection light cage structure to form an upper detection light standing wave field;
according to a fluorescence signal detected on the fountain clock, a zero-order 1/2 wave plate of the upper detection light cage structure is rotationally adjusted, and an atomic fluorescence signal is optimized;
rotating a 10:90 non-polarization beam splitter of the lower detection light cage structure to enable lower detection light reflected and split from the upper detection light cage structure to be coaxial with a central shaft of the lower detection light cage structure;
adjusting a reflector of the lower detection light cage structure to enable lower detection light to form a lower detection light standing wave field in the lower detection light cage structure;
rotating the fixed angle of the lower detection light cage structure optical fiber flange plate to ensure that the light power of the heavy pump light transmitted by the polarization spectroscope is maximum;
the collimating lens is adjusted in an axial sliding mode along the lower detection light cage structure, and collimation of the optical fiber output heavy pump light is achieved;
inserting a rectangular light-cutting piece to cut out rectangular heavy pump light;
adjusting the XY directions of the fixing piece of the optical fiber flange plate of the lower detection light cage structure to ensure that heavy pump light and lower detection light are superposed in the lower detection light cage structure;
and (3) rotationally adjusting a zero-order 1/2 wave plate of the lower detection light cage structure according to the detection fluorescent signal on the fountain clock, and optimizing the atomic fluorescent signal.
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| CN102799101B (en) * | 2012-02-15 | 2013-09-18 | 中国科学院武汉物理与数学研究所 | Physical system device for chip coherent population trapping (CPT) atomic clock |
| CN108983591B (en) * | 2018-08-30 | 2020-04-03 | 中国科学院上海光学精密机械研究所 | Microwave cavity integrating laser cooling, state selection and atom detection |
| CN110928173B (en) * | 2018-09-20 | 2021-10-22 | 中国计量科学研究院 | Adjusting device for reducing frequency deviation uncertainty of fountain clock |
| CN111650174B (en) * | 2020-07-27 | 2021-06-18 | 北京无线电计量测试研究所 | Enhanced atomic fluorescence collecting device and collecting method |
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