CN216119577U - Optical-mechanical device of two-dimensional magneto-optical trap - Google Patents
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Abstract
The utility model provides an optical mechanical device of a two-dimensional magneto-optical trap, which solves the problems that a plurality of optical fibers are adopted in the conventional two-dimensional magneto-optical trap, so that efficient cold atom beams cannot be provided for the three-dimensional magneto-optical trap, the number of cold atoms in the three-dimensional magneto-optical trap and the loading rate are reduced, and the miniaturization is not facilitated. The optical-mechanical device of the two-dimensional magneto-optical trap comprises a vacuum cavity, a cooling light assembly, a beam splitting assembly, a first power polarization control assembly, a second power polarization control assembly, a transfer reflector assembly, a first reflector assembly, a second reflector assembly, a re-pumping light and pushing light assembly; the device is a laser optical path system and a mechanical structure of a two-dimensional magneto-optical trap which only uses one optical fiber to transmit cooling light beams, push light beams and re-pump light beams.
Description
Technical Field
The utility model belongs to the technical field of laser cooling and atom trapping, and particularly relates to an optical-mechanical device of a two-dimensional magneto-optical trap.
Background
With the development and research of cold atoms and supercooled atom systems, modern cold atom physics has gradually moved away from laboratories to engineering applications, such as the implementation of portable cold atom interferometers. So when carrying out cold atom experiment, how to simplify the complexity of ray apparatus system at the biggest optimization experimental apparatus in space to satisfy miniaturization, integrate, portable, possess high stability and high reliability simultaneously and become to walk out of the laboratory for cold atom system, turn to the key problem of practicality.
At present, two-dimensional magneto-optical traps are generally adopted to pre-cool atoms, and efficient cold atom beam current is provided for the three-dimensional magneto-optical traps in vacuum, so that the atoms are cooled and captured. This approach not only spatially simplifies the experimental setup, but also can greatly shorten the atom loading time. The traditional two-dimensional magneto-optical trap generally uses a plurality of polarization maintaining optical fibers to transmit cooling laser beams, push laser beams and re-pump laser beams required by atom cooling, and the aim of atom cooling is achieved by reflecting and reflecting through a reflector. However, the polarization maintaining optical fiber is easily affected by external conditions such as temperature, vibration, pressure and the like, so that fluctuation changes of power of cooling laser beams emitted by a plurality of optical fibers are asynchronous, polarization jitter is inconsistent and the like, so that the cold atomic group 18 has a large divergence angle, is not concentrated in spatial position distribution and has large quantity change, cold atomic beams cannot be stably and efficiently conveyed to the 3D-MOT, and the number and the loading rate of the cold atoms in the three-dimensional magneto-optical trap are reduced. In addition, in order to capture a large number of atoms, a laser beam acting on the atoms is required to be a collimated beam with a large aperture, a method that an optical fiber is led into a collimation and expansion system with a certain length and volume and then enters a vacuum cavity is generally adopted at present, and the multi-path collimation and expansion system brought by a plurality of optical fibers enables the whole two-dimensional magneto-optical trap optical device to be crowded and tedious and is inconvenient for miniaturization application.
Disclosure of Invention
The utility model aims to solve the problems that a plurality of optical fibers are adopted in the existing two-dimensional magneto-optical trap, so that cold atom beams cannot be stably and efficiently provided for the three-dimensional magneto-optical trap, the number and the loading rate of cold atoms in the three-dimensional magneto-optical trap are reduced, and the miniaturization is not facilitated.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
an optical-mechanical device of a two-dimensional magneto-optical trap comprises a vacuum cavity, a cooling light assembly, a beam splitting assembly, a first power polarization control assembly, a second power polarization control assembly, a transfer reflector assembly, a first reflector assembly, a second reflector assembly, a re-pumping light and pushing light assembly; four anti-Helmholtz coils which are arranged in parallel in pairs are arranged on the outer side of the vacuum cavity, and a first optical flat plate, a second optical flat plate, a third optical flat plate and a fourth optical flat plate are arranged on the outer sides of the four anti-Helmholtz coils; the first optical flat plate and the third optical flat plate are arranged in parallel, and the second optical flat plate and the fourth optical flat plate are arranged in parallel; the cooling light assembly, the beam splitting assembly and the first power polarization control assembly are sequentially and coaxially arranged on the first optical flat plate; the cooling light assembly comprises a polarization maintaining optical fiber and an adjustable polarization laser beam expanding and collimating lens assembly, wherein the adjustable polarization laser beam expanding and collimating lens assembly comprises an adjustable polarization laser beam expanding and collimating lens barrel, and a polarization beam splitting prism, a lambda/2 wave plate, a plano-concave lens and a double-cemented convex lens which are sequentially arranged in the adjustable polarization laser beam expanding and collimating lens barrel; the first power polarization control assembly comprises a plurality of first power polarization control units which are sequentially arranged along a light path, and each first power polarization control unit comprises a first polarization beam splitter prism, a first lambda/2 wave plate arranged on an incident light path of the first polarization beam splitter prism and a first lambda/4 wave plate arranged on a reflection light path of the first polarization beam splitter prism; the second power polarization control assembly is arranged on the second optical flat plate and comprises a plurality of second power polarization control units which are sequentially arranged along the light path, and each second power polarization control unit comprises a second polarization beam splitter prism, a second lambda/2 wave plate arranged on the incident light path of the second polarization beam splitter prism and a second lambda/4 wave plate arranged on the reflection light path of the second polarization beam splitter prism; cooling light input by a polarization maintaining optical fiber of the cooling light assembly passes through the adjustable polarization laser beam expanding collimating mirror assembly and then outputs linearly polarized laser beams, and the linearly polarized laser beams are divided into transmission laser beams and reflection laser beams with equal power and vertical polarization directions through the beam splitting assembly; the transmission laser beam enters a first power polarization control assembly, the first power polarization control assembly and a first reflecting mirror assembly arranged on a third optical flat plate convert the transmission laser beam into a plurality of pairs of first circularly polarized light beams with opposite polarization and opposite radiation, and the first circularly polarized light beams and the atom steam interact to form a first light standing field in a one-dimensional direction; the reflected laser beam enters a second power polarization control unit through a transfer mirror assembly arranged on a second optical flat plate, the second power polarization control unit and a second mirror assembly arranged on a fourth optical flat plate convert the reflected laser beam into a plurality of pairs of second circularly polarized light beams with opposite polarization and opposite radiation, and the second circularly polarized light beams and the atom steam form a second light standing field in one-dimensional direction after interaction; the re-pumping light and pushing light assembly comprises a polarization maintaining optical fiber and a laser beam expanding and collimating lens assembly, wherein the laser beam expanding and collimating lens assembly comprises a laser beam expanding and collimating lens barrel, and a plano-concave lens and a double-cemented convex lens which are arranged in the laser beam expanding and collimating lens barrel; the laser beam expanding and collimating mirror assembly is used for enabling the combined push light and the re-pumping light to be incident to the vacuum cavity, and an optical axis of the laser beam expanding and collimating mirror assembly is collinear with the center of the cold atomic group.
Furthermore, in order to facilitate the adjustment of the position of the cooling laser beam and to align the cooling laser beam, a plurality of first power polarization control units may be respectively disposed on the first prism adjustment base, and a plurality of sets of adjustment jackscrews are disposed between the first prism adjustment base and the first optical flat plate, and are used to respectively adjust the position of the first polarization splitting prism. Similarly, the plurality of second power polarization control units are respectively arranged on the second prism adjusting base, and a plurality of groups of adjusting jackscrews are arranged between the second prism adjusting base and the second optical flat plate and are used for respectively adjusting the positions of the second polarization beam splitting prisms.
Further, the beam splitting component comprises a beam splitting lambda/2 wave plate and a beam splitting polarization beam splitting prism which are coaxially arranged along the optical path. The extinction ratios of two mutually perpendicular reflection laser beams and transmission laser beams generated by the beam splitting polarization beam splitting prism are both larger than 1000:1, and the transmissivity of the transmission laser beams and the reflectivity of the reflection laser beams are both larger than 97%.
Further, the first reflector assembly is mounted on the opposite side of the first power polarization control assembly and comprises a plurality of first reflectors and a plurality of first reflection lambda/4 wave plates with the same size as the first reflectors, the central axes of the first reflection lambda/4 wave plates and the central axes of the first lambda/4 wave plates are correspondingly superposed one by one, the first reflectors and the first reflection lambda/4 wave plates are mounted on the first reflector frame in a relatively parallel mode, and the first reflector frame is mounted on the third optical flat plate. The second reflector assembly is arranged on the opposite side of the second power polarization control assembly and comprises a plurality of second reflectors and a plurality of second reflection lambda/4 wave plates with the same size as the second reflectors, the central axes of the second reflection lambda/4 wave plates and the central axes of the second lambda/4 wave plates are correspondingly superposed one by one, the second reflectors and the second reflection lambda/4 wave plates are arranged on the second reflector frame in a relatively parallel mode, and the second reflector frame is arranged on the fourth optical flat plate.
Furthermore, the transfer reflector assembly comprises a first transfer reflector and a second transfer reflector, the first transfer reflector is coaxial with the beam splitting polarization beam splitting prism, and the second transfer reflector is coaxial with the second power polarization control assembly.
Furthermore, in order to compress space and realize miniaturized installation, a first second lambda/2 wave plate in the second power polarization control assembly is installed between the first transfer reflecting mirror and the second transfer reflecting mirror and is vertically installed on the adapter plate, and the central axis of the first second lambda/2 wave plate coincides with the central connecting line of the first transfer reflecting mirror and the second transfer reflecting mirror.
Furthermore, the cooling light assembly, the beam splitting assembly, the first power polarization control assembly, the second power polarization control assembly, the transfer reflector assembly, the first reflector assembly, the second reflector assembly and the re-pumping light and pushing light assembly are all made of nonmagnetic metal.
Compared with the prior art, the utility model has the beneficial effects that:
1. the light path system of the device only uses one optical fiber to split and transmit the cooling light, thereby avoiding the results of asynchronous power fluctuation and inconsistent polarization jitter of the cooling laser beam caused by the influence of a plurality of optical fibers under external conditions, centralizing the relative spatial positions of the captured cold atom beam, reducing the change of the number of cold atoms and the divergence angle, and being more convenient for transmission to 3D-MOT.
2. The device adopts the design of combining the push light and the re-pumping light and sharing the light path system of the laser beam expanding collimating lens barrel, reduces the complexity of an optical system, is convenient to adjust and is easy to miniaturize.
3. The first power polarization control assembly and the second power polarization control assembly are provided with the adjusting jackscrews 303, so that the alignment of the cooling laser beams can be adjusted more conveniently.
Drawings
FIG. 1 is a schematic diagram of an optical path of an opto-mechanical device of the two-dimensional magneto-optical trap of the present invention;
FIG. 2 is a schematic diagram of an opto-mechanical device of the two-dimensional magneto-optical trap according to the present invention;
FIG. 3 is a second schematic diagram of an opto-mechanical device with a two-dimensional magneto-optical trap according to the present invention;
FIG. 4 is a first schematic structural diagram of a first power polarization control element in the apparatus of the present invention;
fig. 5 is a schematic structural diagram of a first power polarization control module in the device of the present invention.
Reference numerals: 10-a vacuum cavity, 11-a laser beam expansion and collimation lens assembly, 12-an adjustable polarization laser beam expansion and collimation lens assembly, 13-a beam splitting assembly, 14-a first power polarization control assembly, 15-a second power polarization control assembly, 16-a first reflector assembly, 17-a transfer reflector assembly, 18-a cold radical, 20-a transfer plate, 21-an anti-Helmholtz coil, 22-a second reflector assembly, 201-a first optical flat plate, 202-a second optical flat plate, 203-a third optical flat plate, 204-a fourth optical flat plate, 131-a beam splitting lambda/2 wave plate, 132-a beam splitting polarization beam splitting prism, 141-a first lambda/2 wave plate, 142-a first polarization beam splitting prism 2, 143-a first lambda/4 wave plate, 144-first prism adjusting base, 161-first reflector, 172-first transfer reflector, 171-second transfer reflector, 301-upper side limiting hole, 302-screw, 303-adjusting jackscrew, 401-transmitting laser beam and 402-reflecting laser beam.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
The utility model provides an optical-mechanical device of a two-dimensional magneto-optical trap, a light path system of the device only utilizes one optical fiber to split and transmit cooling light, and a 2D-MOT light path system which firstly combines the push light and the re-pumping light and then emits the push light and the re-pumping light is adopted, so that the problem that the power fluctuation of a cooling laser beam is asynchronous and the polarization jitter is inconsistent due to the influence of a plurality of optical fibers under external conditions is avoided, the relative spatial positions of captured cold atom beam currents are concentrated, the quantity change is small, the divergence angle is smaller, and the transmission to 3-DMOT is more convenient; meanwhile, enough atoms can participate in the cooling process, a large-flux cold atom beam can be obtained, the complexity of the traditional 2D-MOT optical mechanical device is greatly reduced, and the miniaturization is facilitated.
As shown in fig. 1 to 5, the optical mechanical device of a two-dimensional magneto-optical trap provided by the present invention includes a vacuum chamber 10, a cooling light assembly, a beam splitting assembly 13, a first power polarization control assembly 14, a second power polarization control assembly 15, a relay mirror assembly 17, a first mirror assembly 16, a second mirror assembly 22, and a re-pumping light and pushing light assembly. Two pairs of anti-Helmholtz coils 21 which are opposite to each other are arranged on four sides of the vacuum cavity 10 positioned in the center of the whole device, and the four anti-Helmholtz coils 21 are arranged in parallel. Four optical flat plates which are parallel in pairs are arranged on the outer sides of the four anti-Helmholtz coils 21, wherein the first optical flat plate 201 and the third optical flat plate 203 are opposite faces and are arranged in parallel, the second optical flat plate 202 and the fourth optical flat plate 204 are opposite faces and are arranged in parallel, and the first optical flat plate 201, the second optical flat plate 202, the third optical flat plate 203 and the fourth optical flat plate 204 are perpendicular to each other and are arranged around the vacuum cavity 10. At this time, the first optical flat plate 201 is coaxially provided with a cooling light assembly, a beam splitting assembly 13 and a first power polarization control assembly 14 in sequence; the second optical flat plate 202 is provided with an adapter plate 20, a transfer reflector component 17 and a second power polarization control component 15; the third optical plate 203 is provided with a first mirror assembly 16; the fourth optical flat 204 has the second mirror assembly 22 disposed thereon.
The cooling light component comprises a polarization maintaining optical fiber and an adjustable polarization laser beam expanding and collimating lens component 12, wherein the adjustable polarization laser beam expanding and collimating lens component 12 comprises an adjustable polarization laser beam expanding and collimating lens barrel, and a polarization beam splitting prism, a lambda/2 wave plate, a plano-concave lens and a double-cemented convex lens which are sequentially arranged in the adjustable polarization laser beam expanding and collimating lens barrel. The beam splitting assembly 13 of the present invention includes a beam splitting λ/2 wave plate 131 and a beam splitting polarization beam splitting prism 132 which are coaxially disposed along the optical path.
The first power polarization control assembly 14 of the present invention includes a plurality of first power polarization control units sequentially disposed along the optical path, and each of the first power polarization control units includes a first polarization splitting prism 142, a first λ/2 wave plate 141 disposed on the incident optical path of the first polarization splitting prism 142, and a first λ/4 wave plate 143 disposed on the reflection optical path of the first polarization splitting prism 142. The first λ/4 wave plate 143 is mounted on the bottom side of the first polarization splitting prism 142, and the central axis thereof coincides with the reflection central axis of the first polarization splitting prism 142, and the first λ/2 wave plate 141 coincides with the incidence central axis of the first polarization splitting prism 142.
The second power polarization control assembly 15 and the first power polarization control assembly 14 have similar structures and comprise a plurality of second power polarization control units which are sequentially arranged along a light path, wherein each second power polarization control unit comprises a second polarization beam splitter prism, a second lambda/2 wave plate arranged on an incident light path of the second polarization beam splitter prism and a second lambda/4 wave plate arranged on a reflecting light path of the second polarization beam splitter prism. The second lambda/4 wave plate is arranged at the bottom side of the second polarization splitting prism, the central axis of the second lambda/4 wave plate coincides with the vertical central axis of the second polarization splitting prism, and the second lambda/2 wave plate coincides with the central axis of the second polarization splitting prism and is arranged on the second prism adjusting base.
The turning mirror assembly 17 of the present invention is disposed on the second optical flat plate 202, and includes a first turning mirror 172 and a second turning mirror 171, the first turning mirror 172 is disposed coaxially with the beam splitting polarization beam splitting prism 132, the second turning mirror 171 is disposed coaxially with the second power polarization control assembly 15, and the first turning mirror 172 and the second turning mirror 171 may specifically adopt 45 ° mirrors.
The first mirror assembly 16 and the second mirror assembly 22 have the same structure, the first mirror assembly 16 is installed on the opposite side of the first power polarization control assembly 14, and includes a plurality of first mirrors 161 and a plurality of first reflective λ/4 wave plates with the same size as the first mirrors 161, and the central axes of the first reflective λ/4 wave plates and the central axis of the first λ/4 wave plate 143 are correspondingly overlapped one by one, at this time, the first mirrors 161 and the first reflective λ/4 wave plates can be installed on the first mirror frame in parallel relatively, and the first mirror frame is installed on the third optical flat plate 203. Similarly, the second mirror assembly 22 is mounted on the opposite side of the second power polarization control assembly 15, and includes a plurality of second mirrors and a plurality of second reflective λ/4 wave plates having the same size as the second mirrors, the central axes of the second reflective λ/4 wave plates and the central axes of the second reflective λ/4 wave plates are coincided in a one-to-one correspondence manner, the second mirrors are mounted on the second mirror frame in parallel with the second reflective λ/4 wave plates, and the second mirror frame is disposed on the fourth optical flat plate 204.
The re-pumping light and pushing light assembly comprises a polarization maintaining optical fiber and a laser beam expanding and collimating lens assembly 11, wherein the laser beam expanding and collimating lens assembly 11 comprises a laser beam expanding and collimating lens barrel, and a plano-concave lens and a double-cemented convex lens which are arranged in the laser beam expanding and collimating lens barrel; the laser beam expanding and collimating mirror assembly 11 is used for enabling the combined push light and the re-pumping light to be incident to the vacuum cavity, and an optical axis of the laser beam expanding and collimating mirror assembly 11 is collinear with the center of the cold atomic group 18.
The cooling light is transmitted by a polarization-maintaining optical fiber and enters an adjustable polarization laser beam expanding and collimating lens assembly 12 with an optical fiber base, and the expanded light beam irradiates and enters a beam splitting assembly 13 and is divided into two transmission laser beams 401 with equal power and polarization directions respectively parallel to the transmission laser beams and two reflection laser beams 402 vertical to the transmission laser beams. The transmitted laser beam 401 enters the first power polarization control component 14, the first power polarization control component 14 and the first mirror component 16 arranged on the second optical flat plate 202 convert the transmitted laser beam 401 into a plurality of pairs of first circularly polarized light beams with opposite polarization and opposite radiation, and the first circularly polarized light beams and the atom vapor form a first optical standing field in a one-dimensional direction after interaction; the reflected laser beam 402 passes through the relay reflector assembly 17 disposed on the second optical plate 202, is reflected by the first reflector 161 and the second reflector, and then enters the second power polarization control assembly 15, the second power polarization control unit and the second reflector assembly 22 disposed on the fourth optical plate 204 convert the reflected laser beam 402 into a plurality of pairs of second circularly polarized beams with opposite polarizations, and the second circularly polarized beams interact with the atom vapor to form a one-dimensional second light wave standing field. At the moment, the pumping light and the pushing light are transmitted through a polarization maintaining optical fiber, enter a laser beam expanding collimating lens barrel with an optical fiber base arranged on the front side of the vacuum cavity, are expanded and then irradiate into the vacuum cavity.
The plurality of first power polarization control units of the first power polarization control assembly 14 of the present invention are all disposed on the first prism adjustment base 144, a plurality of sets of adjustment jackscrews 303 are disposed between the first prism adjustment base 144 and the first optical flat 201 for adjusting the positions of the first polarization splitting prisms, respectively, the plurality of second power polarization control units of the second power polarization control assembly 15 are all disposed on the second prism adjustment base, and a plurality of sets of adjustment jackscrews are disposed between the second prism adjustment base and the second optical flat 202 for adjusting the positions of the second polarization splitting prisms, respectively.
As shown in fig. 5, in the embodiment of the present invention, the prism adjustment bases on the first optical flat 201 and the second optical flat 202 adopt three sets of adjusting screws 303 and three sets of screws 302 for fixing and adjusting, which are distributed in the spatial direction, that is, two sets of adjusting screws 303 and one set of screws 302 are on one side of the bottom side of the prism, and two sets of screws 302 and one set of adjusting screws 303 are on the other side of the bottom side of the prism. In addition, the prism adjusting base is provided with an upper limiting hole 301 for limiting the movement of the polarization splitting prism.
The extinction ratio of two beams of mutually perpendicular P light and S light generated by the polarization beam splitter prism is larger than 1000:1, the transmissivity of the P light and the reflectivity of the S light are larger than 97%, all the reflecting elements are coated with a total reflection film of reflected laser wavelength on the reflecting surface, and the reflectivity of the reflection film is larger than 99.9%. The metal adopted by the mechanical structure fixing element of the device is non-magnetic metal, such as titanium alloy and aluminum alloy.
As shown in fig. 2, in order to compress the space, the first second λ/2 wave plate in the second power polarization control module 15 is installed between the first relay reflector 172 and the second relay reflector 171, and is vertically installed on the adapter plate 20, and its central axis coincides with the central connecting line of the first relay reflector 172 and the second relay reflector 171.
As shown in fig. 1, the optical path working principle of the two-dimensional magneto-optical trap for cooling atoms is as follows:
after passing through the adjustable polarization laser beam expanding and collimating lens barrel, cooling light input by one polarization maintaining fiber outputs a linear polarization laser beam with the diameter of about 20cm, enters the beam splitting component 13, rotates the beam splitting lambda/2 wave plate 131, and is split into two laser beams with the power ratio of 1:1 after passing through the beam splitting polarization beam splitting prism 132, wherein the transmission laser beam 401 is a P component (i.e., transmission light) with the optical axis parallel to the incident laser optical axis, and the reflection laser beam 402 is an S component (i.e., refraction light) with the optical axis perpendicular to the incident laser optical axis.
The P component of the transmitted light beam enters the first power polarization control assembly 14, each first λ/2 wave plate 141 is rotated, so that the power of the P components of the beams split by each first power polarization control unit is equal, the P component after the beam splitting is refracted by the first polarization splitting prism 142, passes through the first λ/4 wave plate 143, rotates the first λ/4 wave plate 143 to be changed into circularly polarized light, passes through the anti-helmholtz coil 21, then passes through the vacuum chamber, is reflected by the first mirror assembly 16, and returns in the opposite direction of the original path, the pair of oppositely-reflected first circularly polarized light beams in the opposite polarization directions can be generated by rotating the first λ/4 wave plate 143, the paths of the P components split by the plurality of first polarization splitting prisms 142 are the same, and form a first optical wave field in the one-dimensional direction after the P components interact with the atom vapor in the direction.
The refracted light beam S component enters the second power polarization control component 15 through the relay reflector component 17, and the refracted light beam is controlled by adjusting the first relay reflector 172 and the second relay reflector 171 of the relay reflector component 17 so that the optical axis thereof is exactly coincident with the central axis of the second power polarization control component 15. After entering the second power polarization control assembly 15, the second λ/2 wave plate is rotated to make the powers of the S components of the beams split by each second power polarization control unit equal, the beams are refracted by the second polarization splitting prism and pass through the second λ/4 wave plate, become circularly polarized light, pass through the anti-helmholtz coil 21, pass through the vacuum chamber, are reflected by the second reflector assembly 22, and return along the opposite direction of the original path, the second λ/4 wave plate is rotated to generate a pair of oppositely-reflected second circularly polarized beams with opposite polarization directions, and interact with the atom vapor in the direction to form a second light wave standing field in the vertical dimension direction, the S component paths split by the second polarization splitting prisms are the same, and interact with the atom vapor in the direction to form a corresponding second light wave standing field. The first and second light wave standing fields interact with the atom vapor in the vacuum chamber to cool and decelerate the atoms in two dimensions to form a cold atomic group 18.
The optical axes of the pumping light and the pushing light are collinear with the center of the formed cold atom group 18, the laser beam expanded into about 20mm by the laser beam expanding collimating light cylinder is emitted into the vacuum cavity, more usable atom numbers are provided for the interaction of the cooling light and the atoms by the pumping light, and the pushing light is 3D-MOT to convey the cold atom beam with large flux.
Claims (10)
1. An optical-mechanical device of two-dimensional magneto-optical trap is characterized in that: the device comprises a vacuum cavity (10), a cooling light assembly, a beam splitting assembly (13), a first power polarization control assembly (14), a second power polarization control assembly (15), a transfer reflector assembly (17), a first reflector assembly (16), a second reflector assembly (22) and a re-pumping light and pushing light assembly;
four anti-Helmholtz coils (21) which are arranged in parallel in pairs are arranged on the outer side of the vacuum cavity (10), and a first optical flat plate (201), a second optical flat plate (202), a third optical flat plate (203) and a fourth optical flat plate (204) are arranged on the outer sides of the four anti-Helmholtz coils (21); the first optical flat plate (201) and the third optical flat plate (203) are arranged in parallel, and the second optical flat plate (202) and the fourth optical flat plate (204) are arranged in parallel;
the cooling light assembly, the beam splitting assembly (13) and the first power polarization control assembly (14) are sequentially and coaxially arranged on the first optical flat plate (201); the cooling light assembly comprises a polarization maintaining optical fiber and an adjustable polarization laser beam expanding and collimating lens assembly (12), wherein the adjustable polarization laser beam expanding and collimating lens assembly (12) comprises an adjustable polarization laser beam expanding and collimating lens barrel, and a polarization beam splitting prism, a lambda/2 wave plate, a plano-concave lens and a double-cemented convex lens which are sequentially arranged in the adjustable polarization laser beam expanding and collimating lens barrel; the first power polarization control assembly (14) comprises a plurality of first power polarization control units which are sequentially arranged along a light path, and each first power polarization control unit comprises a first polarization splitting prism (142), a first lambda/2 wave plate (141) arranged on an incident light path of the first polarization splitting prism (142) and a first lambda/4 wave plate (143) arranged on a reflection light path of the first polarization splitting prism (142);
the second power polarization control assembly (15) is arranged on the second optical flat plate (202) and comprises a plurality of second power polarization control units which are sequentially arranged along a light path, and each second power polarization control unit comprises a second polarization beam splitter prism, a second lambda/2 wave plate arranged on an incident light path of the second polarization beam splitter prism and a second lambda/4 wave plate arranged on a reflection light path of the second polarization beam splitter prism;
cooling light input by a polarization maintaining optical fiber of the cooling light assembly passes through the adjustable polarization laser beam expanding and collimating mirror assembly (12) and then outputs linearly polarized laser beams, and the linearly polarized laser beams are divided into transmission laser beams (401) and reflection laser beams (402) which have equal power and are vertical to each other in polarization direction through the beam splitting assembly (13);
the transmission laser beam (401) enters a first power polarization control component (14), the first power polarization control component (14) and a first reflector component (16) arranged on a third optical flat plate (203) convert the transmission laser beam (401) into a plurality of pairs of first circularly polarized light beams with opposite polarization and opposite radiation, and the first circularly polarized light beams and the atom vapor form a first optical standing field in one-dimensional direction after interaction;
the reflected laser beam (402) enters a second power polarization control unit through a transfer reflector assembly (17) arranged on a second optical flat plate (202), the second power polarization control unit and a second reflector assembly (22) arranged on a fourth optical flat plate (204) convert the reflected laser beam (402) into a plurality of pairs of second circularly polarized light beams with opposite polarization and opposite radiation, and the second circularly polarized light beams and the atom steam form a one-dimensional second light standing field after interaction;
the re-pumping light and pushing light assembly comprises a polarization maintaining optical fiber and a laser beam expanding and collimating lens assembly (11), wherein the laser beam expanding and collimating lens assembly (11) comprises a laser beam expanding and collimating lens barrel, a plano-concave lens and a double-cemented convex lens, and the plano-concave lens and the double-cemented convex lens are arranged in the laser beam expanding and collimating lens barrel; the laser beam expanding and collimating mirror assembly (11) is used for enabling combined push light and re-pumping light to be incident into the vacuum cavity (10), and an optical axis of the laser beam expanding and collimating mirror assembly (11) is collinear with the center of the cold atomic group (18).
2. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 1, wherein: the plurality of first power polarization control units are arranged on the first prism adjusting base (144), and a plurality of groups of adjusting jackscrews (303) are arranged between the first prism adjusting base (144) and the first optical flat plate (201) and are used for adjusting the position of the first polarization splitting prism (142) respectively.
3. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 2, wherein: the second power polarization control units are all arranged on the second prism adjusting base, and a plurality of groups of adjusting jackscrews (303) are arranged between the second prism adjusting base and the second optical flat plate (202) and are used for adjusting the positions of the second polarization beam splitting prisms respectively.
4. The optomechanical device of a two-dimensional magneto-optical trap of claim 1, 2, or 3, wherein: the beam splitting component (13) comprises a beam splitting lambda/2 wave plate (131) and a beam splitting polarization beam splitting prism (132) which are coaxially arranged along an optical path.
5. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 4, wherein: the extinction ratios of the reflected laser beam (402) and the transmitted laser beam (401) generated by the beam splitting polarization beam splitting prism (132) are both larger than 1000:1, and the transmissivity of the transmitted laser beam (401) and the reflectivity of the reflected laser beam (402) are both larger than 97%.
6. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 5, wherein: the first reflector component (16) is arranged on the opposite side of the first power polarization control component (14) and comprises a plurality of first reflectors (161) and a plurality of first reflection lambda/4 wave plates with the same size as the first reflectors (161), the central axes of the first reflection lambda/4 wave plates correspond to and coincide with the central axis of the first lambda/4 wave plate (143) one by one, the first reflectors (161) and the first reflection lambda/4 wave plates are arranged on the first reflector frame in a relatively parallel mode, and the first reflector frame is arranged on the third optical flat plate (203).
7. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 6, wherein: the second reflector assembly (22) is arranged on the opposite side of the second power polarization control assembly (15) and comprises a plurality of second reflectors and a plurality of second reflection lambda/4 wave plates with the same size as the second reflectors, the central axes of the second reflection lambda/4 wave plates and the central axes of the second lambda/4 wave plates are correspondingly superposed one by one, the second reflectors and the second reflection lambda/4 wave plates are arranged on a second reflector frame in a relatively parallel mode, and the second reflector frame is arranged on a fourth optical flat plate (204).
8. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 7, wherein: the transfer reflector assembly (17) comprises a first transfer reflector (172) and a second transfer reflector (171), the first transfer reflector (172) and the beam splitting polarization beam splitting prism (132) are coaxially arranged, and the second transfer reflector (171) and the second power polarization control assembly (15) are coaxially arranged.
9. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 8, wherein: and a first second lambda/2 wave plate in the second power polarization control assembly (15) is arranged on the adapter plate (20) and is positioned between the first transfer reflector (172) and the second transfer reflector (171), and the central axis of the first second lambda/2 wave plate is superposed with the central connecting line of the first transfer reflector (172) and the second transfer reflector (171).
10. The opto-mechanical arrangement of two-dimensional magneto-optical traps of claim 9, wherein: the cooling light assembly, the beam splitting assembly (13), the first power polarization control assembly (14), the second power polarization control assembly (15), the transfer reflector assembly (17), the first reflector assembly (16), the second reflector assembly (22) and the re-pumping light and pushing light assembly are made of nonmagnetic metal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11797873B2 (en) | 2020-03-02 | 2023-10-24 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
| CN117381212A (en) * | 2023-11-23 | 2024-01-12 | 江阴创可激光技术有限公司 | Laser processing device for emitting light of double lasers |
| US11875227B2 (en) * | 2022-05-19 | 2024-01-16 | Atom Computing Inc. | Devices and methods for forming optical traps for scalable trapped atom computing |
| US11995512B2 (en) | 2018-11-13 | 2024-05-28 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11995512B2 (en) | 2018-11-13 | 2024-05-28 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
| US11797873B2 (en) | 2020-03-02 | 2023-10-24 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
| US11875227B2 (en) * | 2022-05-19 | 2024-01-16 | Atom Computing Inc. | Devices and methods for forming optical traps for scalable trapped atom computing |
| CN117381212A (en) * | 2023-11-23 | 2024-01-12 | 江阴创可激光技术有限公司 | Laser processing device for emitting light of double lasers |
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