CN213932856U - double-Raman optical device for double-polishing type cold atom interferometer - Google Patents
double-Raman optical device for double-polishing type cold atom interferometer Download PDFInfo
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- CN213932856U CN213932856U CN202023312699.5U CN202023312699U CN213932856U CN 213932856 U CN213932856 U CN 213932856U CN 202023312699 U CN202023312699 U CN 202023312699U CN 213932856 U CN213932856 U CN 213932856U
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Abstract
The utility model relates to a double Raman optical device for a polishing type cold atom interferometer, which comprises two Raman optical sources, a Raman optical phase control component and a Raman optical splitting and collimating component, wherein the Raman optical phase control component is respectively in signal connection with the two Raman optical sources, and the Raman optical sources are connected with the Raman optical splitting and collimating component through optical fibers; the two Raman light sources generate two independent Raman lights, the frequency difference of the two Raman lights corresponds to the energy difference of two ground state energy levels of the cold atom, and the Raman lights can enable the cold atom to carry out the draw ratio transition; the Raman optical phase control assembly generates two paths of microwave signals with independently controllable phases, the frequency of the two paths of microwave signals corresponds to the frequency difference of the Raman light, and the phases of the Raman light are controlled by adjusting the phases of the microwave signals; the Raman light splitting and collimating component splits the two Raman lights into three parallel, coplanar and equidistant Raman lights, wherein two Raman lights originate from the same Raman light source. The utility model discloses can realize carrying out the independent control to the interference phase place of two radicals.
Description
Technical Field
The utility model relates to a cold atom field of interfering, concretely relates to a two raman optical devices that are used for cold atom interferometer to the type of throwing.
Background
Because the fluctuation of atoms gradually appears in the super-cooling state, the atomic substance waves are interfered by preparing the atoms in the super-cooling state, and the physical information carried by the atomic substance waves in the projection path is measured. With the development of cold atom technology, cold atom interferometers have been used to measure physical quantities such as physical constants, gravitational acceleration, gravitational gradient, rotation, and the like with high accuracy.
The throwing type cold atom interferometer is simultaneously imprisoned for two atomic groups, then the two atomic groups are oppositely thrown, and then the two atomic groups are imprisoned again, so that the imprisoning efficiency of atoms is increased. On the throwing path of the atomic groups, the three beams of Raman light are emitted to split, reflect and combine the atomic groups, so that the atomic groups form a closed interference loop. Rotation, acceleration and other information can be calculated through the interference phase of the atomic group terminal state. In a counter-polished cold atom interferometer, two radicals share the three raman beams. In the existing counter-polishing type cold atom interferometer, the three beams of Raman light come from the same Raman light source, so that the interference phase of the single atomic group tail state cannot be adjusted. The interference phases of the two radicals can be independently adjusted, and the interference process of the radicals can be optimized to the greatest extent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem who exists among the prior art, provide a two raman optical devices for being directed at the cold atom interferometer of throwing type, realize carrying out the independent control to the interference phase place of two radicals, can optimize the interference process of radical to the at utmost.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a double-Raman optical device for a polishing type cold atom interferometer comprises two Raman optical sources, a Raman optical phase control assembly and a Raman optical splitting and collimating assembly, wherein the Raman optical phase control assembly is respectively in signal connection with the two Raman optical sources, and the two Raman optical sources are connected with the Raman optical splitting and collimating assembly through optical fibers;
the two Raman light sources are used for generating two beams of independent Raman light, the frequency difference of the two beams of Raman light corresponds to the energy difference of two ground state energy levels of the cold atom, and the Raman light can enable the cold atom to carry out the draw ratio transition;
the Raman optical phase control assembly is used for generating two paths of microwave signals with independently controllable phases, the frequency of the microwave signals corresponds to the frequency difference of the Raman light, and the phases of the Raman light are controlled by adjusting the phases of the microwave signals;
the Raman light splitting and collimating assembly is used for splitting two Raman lights into three Raman lights which are parallel, coplanar and equidistant, wherein two Raman lights originate from the same Raman light source, and the three Raman lights act on atoms to form a closed cold atom interference loop.
Further, the raman light splitting and collimating assembly is configured to split one of the raman lights into two parallel raman lights, and adjust the other raman light to be parallel to and coplanar with the other two raman lights, and the middle raman light is equidistant to the other two raman lights.
Further, the raman light splitting and collimating assembly comprises two fiber spreading collimators, three half-wave plates and three polarization splitting prisms, wherein the two fiber spreading collimators are respectively coupled with the two raman light sources through fibers; the Raman light of the Raman light source sequentially passes through the first optical fiber beam-expanding collimator, the first half-wave plate and the first polarization beam splitter prism to emit a first beam of Raman light, and then sequentially passes through the second half-wave plate and the second polarization beam splitter prism to emit a second beam of Raman light; the Raman light of the Raman light source sequentially passes through the second optical fiber beam expanding collimator, the third half wave plate and the third polarization beam splitting prism to emit a third beam of Raman light; three beams of Raman light emitted by the three polarization beam splitting prisms are parallel and coplanar, and the second beam of Raman light is equidistant to the other two beams of Raman light.
The utility model has the advantages that: in the existing counter-polishing type cold atom interferometer, three parallel and equidistant Raman lights act on atoms, and the three Raman lights come from the same Raman light source and can only adjust the phases of the three Raman lights at the same time, so that the interference phase of a single atomic group tail state cannot be adjusted. The utility model discloses an adjust the microwave adjustment signal that raman optical phase control subassembly sent to one of them or two bundles of wherein to carrying out the phase adjustment in three bundles of raman light, thereby realize adjusting alone the interference phase place of two radicals, can optimize the interference process of radical to the at utmost.
Drawings
FIG. 1 is a schematic diagram of the present invention for a counter-throw cold atom interferometer;
fig. 2 is the light path schematic diagram of the raman light splitting and collimating assembly of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-2 parts of a Raman light source, 3 parts of a Raman light phase control assembly, 4 parts of a Raman light splitting and collimating assembly, 41 parts of an optical fiber beam expanding and collimating device, 42 parts of a half wave plate, 43 parts of a polarization splitting prism, 5 parts of an atomic vacuum air chamber, 6 parts of three beams of Raman light, 7 parts of a Raman light reflecting mirror.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the double-raman optical device for the polishing type cold atom interferometer comprises a raman optical source 1, a raman optical source 2, a raman optical phase control component 3 and a raman optical splitting and collimating component 4, wherein the raman optical phase control component 3 is in signal connection with the raman optical source 1 and the raman optical source 2 respectively, and the raman optical source 1 and the raman optical source 2 are connected with the raman optical splitting and collimating component 4 respectively through optical fibers.
The Raman light source 1 and the Raman light source 2 are used for generating two independent Raman lights, the frequency difference of the two Raman lights corresponds to the energy difference of two ground state energy levels of a cold atom, and the Raman lights can enable the cold atom to carry out the draw ratio transition;
the Raman optical phase control assembly 3 is used for generating two paths of microwave signals with independently controllable phases, the frequency of the microwave signals corresponds to the frequency difference of the Raman light, and the phases of the Raman light are controlled by adjusting the phases of the microwave signals;
the Raman light splitting and collimating component 4 is used for splitting two Raman lights into three Raman lights 6 which are parallel, coplanar and equidistant, wherein two Raman lights originate from the same Raman light source, and the three Raman lights 6 act on atoms to form a closed cold atom interference loop in the atom vacuum air chamber 5.
Further, the raman light splitting and collimating component 4 is configured to split one of the raman lights into two parallel and coplanar raman lights, and adjust the other raman light to be parallel and coplanar with the other two raman lights, and the three raman lights 6 emitted by the raman light splitting and collimating component 4 are parallel and equidistant.
The optical path schematic diagram of the raman light splitting and collimating assembly 4 is shown in fig. 2, two raman lights are respectively emitted in parallel through the optical fiber beam expanding collimator 41, wherein one raman light is split into two parallel and coplanar raman lights through the combination of two sets of half-wave plates and the polarization beam splitter prism, and the other raman light is parallel and coplanar with the first two raman lights through the other half-wave plate and the polarization beam splitter prism to form three parallel and coplanar raman lights 6 with the same distance between the adjacent raman lights. Specifically, the raman light splitting and collimating assembly 4 includes two fiber spreading collimators 41, three half-wave plates 42, and three polarization splitting prisms 43, where the two fiber spreading collimators 41 are respectively coupled with the raman light source 1 and the raman light source 2 through optical fibers; the raman light of the raman light source 2 sequentially passes through the first optical fiber beam-expanding collimator 41, the first half-wave plate 42 and the first polarization beam splitter prism 43 to emit a first raman light beam, and sequentially passes through the second half-wave plate 42 and the second polarization beam splitter prism 43 to emit a second raman light beam; the raman light of the raman light source 1 sequentially passes through the second fiber beam expanding collimator 41, the third half-wave plate 42 and the third polarization beam splitting prism 43 to emit a third beam of raman light; the three beams of raman light 6 emitted by the three polarization beam splitting prisms 43 are parallel and coplanar, and the second beam of raman light is equidistant from the other two beams of raman light.
The modes of generating the raman light by the raman light source 1 and the raman light source 2 in this embodiment include, but are not limited to: the single-frequency laser generates a sideband through an electro-optic modulator, the single-frequency laser generates a sideband through an IQ modulator, and the optical phase-locked loop technology is adopted.
The working principle is as follows:
as shown in FIG. 1, in the atom vacuum gas cell 5 of the cold atom interferometer, two radicals realize the double throwing and repeated trapping. The raman optical phase control module 3 generates two microwave signals with independently controllable phases for controlling the two raman optical sources (i.e. the raman optical source 1 and the raman optical source 2) respectively. Two Raman lights generated by the Raman light source 1 and the Raman light source 2 are transmitted to the Raman light splitting and collimating assembly 4 through optical fibers. The Raman light splitting and collimating component 4 splits the Raman light generated by the Raman light source 1 into 2 parallel Raman lights which are used as a first beam and a second (middle) Raman light in three beams of Raman light 6 in the atomic vacuum gas chamber 5; the raman light splitting and collimating component 4 adjusts the raman light generated by the raman light source 2 to be parallel and coplanar with the first beam of raman light and the second beam of raman light, and the raman light is used as the third beam of raman light in the three beams of raman light 6 in the atomic vacuum gas chamber 5. The distance from the second beam of Raman light to the first beam of Raman light is equal to the distance from the third beam of Raman light to the first beam of Raman light. The raman optical mirror 7 is used to return the three beams of raman light 6 in the original path and deflect the phases of the three beams of raman light 6 by 90 degrees.
In this embodiment, the utility model discloses can the first, two phase place of restrainting and the third bundle of Raman light of independent control to the realization is to two interference phase places to throwing the atomic group and carry out the independent control. The reason is as follows: the phases of the first beam of Raman light and the second beam of Raman light are controlled by the same microwave signal, and the phase of the third beam of Raman light is controlled by the other microwave signal. The phases of two paths of microwave signals generated by the Raman optical phase control component 3 at the time of striking the first beam, the second beam and the third beam of Raman light are assumed to be respectively
And
wherein
Originating from the same microwave conditioning signal as the one,
originating from another microwave conditioning signal. Then, the left radical carries the Raman optical phase phi after passing through the three Raman lights 6Left side ofComprises the following steps:
the right radical carries the Raman optical phase phi after passing through the three beams of Raman light 6Right sideComprises the following steps:
from the above expressions, by adjusting individually
Namely, the interference phase of the left radical can be adjusted, and similarly, the interference phase can be adjusted by independently adjusting
The interference phase of the right radical can be adjusted.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (3)
1. The double-Raman optical device for the polishing type cold atom interferometer is characterized by comprising two Raman optical light sources (1 and 2), a Raman optical phase control assembly (3) and a Raman optical splitting and collimating assembly (4), wherein the Raman optical phase control assembly (3) is respectively in signal connection with the two Raman optical light sources (1 and 2), and the two Raman optical light sources (1 and 2) are connected with the Raman optical splitting and collimating assembly (4) through optical fibers;
the two Raman light sources (1 and 2) are used for generating two independent Raman lights, the frequency difference of the two Raman lights corresponds to the energy difference of two ground state energy levels of the cold atom, and the Raman lights can enable the cold atom to carry out the transformation of the draw ratio;
the Raman optical phase control assembly (3) is used for generating two paths of microwave signals with independently controllable phases, the frequency of the microwave signals corresponds to the frequency difference of the Raman light, and the phases of the Raman light are controlled by adjusting the phases of the microwave signals;
the Raman light splitting and collimating component (4) is used for splitting two Raman lights into three parallel, coplanar and equidistant Raman lights, wherein two Raman lights originate from the same Raman light source, and the three Raman lights act on atoms.
2. The dual raman optical device for use in a counter-polished cold atom interferometer of claim 1, wherein the raman optical splitting and collimating assembly (4) is configured to split one of the raman lights into two parallel raman lights and to adjust the other raman light to be parallel and coplanar with the other two raman lights, and the middle raman light is equidistant between the two raman lights.
3. The dual-raman optical device for a polished cold-atom interferometer according to claim 1 or 2, wherein the raman optical splitting and collimating assembly (4) comprises two fiber-expanded beam collimators (41), three half-wave plates (42), and three polarization splitting prisms (43), the two fiber-expanded beam collimators (41) are respectively coupled with the two raman optical sources (1, 2) through optical fibers; the Raman light of the Raman light source (2) sequentially passes through the first optical fiber beam-expanding collimator (41), the first half-wave plate (42) and the first polarization beam splitter prism (43) to emit a first Raman light beam, and then sequentially passes through the second half-wave plate (42) and the second polarization beam splitter prism (43) to emit a second Raman light beam; the Raman light of the Raman light source (1) sequentially passes through the second optical fiber beam expanding collimator (41), the third half wave plate (42) and the third polarization beam splitting prism (43) to emit a third beam of Raman light; three beams of Raman light (6) emitted by the three polarization beam splitting prisms (43) are parallel and coplanar, and the second beam of Raman light is equidistant to the other two beams of Raman light.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167080A (en) * | 2021-10-26 | 2022-03-11 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Horizontal acceleration measuring device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167080A (en) * | 2021-10-26 | 2022-03-11 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Horizontal acceleration measuring device and method |
| CN114167080B (en) * | 2021-10-26 | 2024-05-10 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Horizontal acceleration measuring device and method |
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