Hollow-core optical fiber confinement gas excitation and collection device

Abstract

The utility model discloses a hollow-core optical fiber confinement gas excitation and collection device. The device comprises a laser system, an optical focusing system, an ion separation collecting electrode, a hollow-core optical fiber and a metal steam supply system, a laser system and an optical focusing system are arranged near one end of the hollow-core optical fiber, a metal steam supply system is arranged near the other end of the hollow-core optical fiber, laser emitted by the laser system is focused on a laser incidence end face through the optical focusing system, and the metal steam supply system is connected with the metal steam incidence end face and outputs metal steam into the hollow-core optical fiber. An ion separation collecting electrode is arranged near the periphery of the laser incident end surface; during collection, the laser system emits laser, the hollow-core optical fiber serves as a working cavity, the metal steam supply system conveys metal steam, the metal steam and the laser collide with each other in the working cavity, metal atoms absorb photon energy and are excited into metal ions, and the ion separation collection electrode separates and collects the metal ions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of atomic excitation, concretely relates to a kind of hollow optical fiber restriction gas excitation collection device based on laser excitation. BACKGROUND

[0002] Laser excitation atom ionization is an important aspect of laser technology application, not only has potential economic value, great application prospect, but also has great scientific significance.The basic principle of laser separation atom is to use laser to selectively excite target atom and suppress other adjacent atom excitation.Because the neutron of isotope nucleus is different, the energy level of them will be displaced, and the wavelength of emitted radiation will have small difference, laser has good monochromaticity, can be used to excite certain isotope in isotope nucleus, without exciting other isotopes, i.e., using laser to excite certain isotope in isotope atom group to ionization;Then, using electric field to separate ionized atom from isotope mixture, can excite these atoms to high energy level, separate atom, and obtain required isotope atom after gathering.Based on the good monochromaticity of laser and isotope spectral displacement of nucleus, laser can separate isotope atom, i.e., using laser to selectively excite target isotope and suppress other isotope excitation, can realize the concentration of certain isotope.

[0003] With the mature development of optical fiber technology, especially the development and application of hollow optical fiber technology, the prior art lacks the device for realizing laser excitation atom separation based on optical fiber performance. UTILITY MODEL CONTENT

[0004] In order to solve the problems in the background art and break through the prior art, the utility model provides a device for exciting and collecting metal ions by using hollow optical fiber.

[0005] The specific technical scheme of the utility model is as follows:

[0006] The device comprises a laser system, an optical focusing system, ion separation and collection electrodes, a hollow optical fiber and a metal vapor supply system; one end surface of the hollow optical fiber serves as a laser incidence end surface, and the laser system and the optical focusing system are arranged near the end surface; the other end surface serves as a metal vapor incidence end surface, and the metal vapor supply system is arranged near the end surface; the laser system emits laser which is focused to the laser incidence end surface of the hollow optical fiber through the optical focusing system, and then is emitted from the metal vapor incidence end surface after passing through the hollow optical fiber; the output end of the metal vapor supply system is connected to the metal vapor incidence end surface through a pipeline; the metal vapor supply system is used to output metal atom vapor into the hollow optical fiber; the ion separation and collection electrodes for separating and collecting positive and negative ions are arranged around the laser incidence end surface of the hollow optical fiber; and the focal point of the optical focusing system is located at the center of the laser incidence end surface.

[0007] The laser system comprises a laser and a laser frequency locker; the laser is generated by the laser, and then is connected to the laser frequency locker, and the laser is emitted after being processed by the laser frequency locker.

[0008] The laser generated by the laser covers the required working wavelength and has a photon energy greater than the energy required for exciting and ionizing metal atoms; the laser emitted after being processed by the laser frequency locker should meet the laser required for exciting and ionizing metal atoms and avoid exciting and ionizing other atoms.

[0009] The laser focusing system mainly comprises a plurality of lenses, and the laser is transmitted and focused to the center of the laser incident end face by the plurality of lenses, and then is coupled into the hollow core optical fiber and emitted from the metal vapor incident end face after propagating in the cavity inside the hollow core optical fiber.

[0010] The ion separation and collection electrode mainly comprises a pair of plate electrodes, and the pair of plate electrodes are arranged on the two sides of the laser incident end face, respectively, and the direction of the electric field force generated between the pair of plate electrodes is perpendicular to the emission direction of the laser system.

[0011] The metal atom vapor is, for example, barium vapor, platinum vapor, tungsten vapor, tin vapor and uranium vapor.

[0012] The beneficial effects of the utility model are as follows:

[0013] The hollow core optical fiber confined gas excitation and collection device proposed by the utility model confines the laser and the metal atom vapor in the hollow core optical fiber, greatly improves the collision probability of photons and metal atoms and the ionization rate of metal atoms. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The schematic diagram of the hollow core optical fiber confined gas excitation and collection device is shown in the figure.

[0015] In the figure: 1, laser system, 2, optical focusing system, 3, ion separation and collection electrode, 4, hollow core optical fiber, 5, metal vapor supply system, 41, laser incident end face, 42, metal vapor incident end face. DETAILED DESCRIPTION

[0016] The utility model will be further described in detail in combination with the drawings and specific embodiments, but the utility model is not limited to the following embodiments.

[0017] The embodiments of the utility model are as follows:

[0018] The schematic diagram of the hollow core optical fiber confined gas excitation and collection device of the embodiment is shown in the figure. Figure 1

[0019] ​This embodiment includes a laser system 1, an optical focusing system 2, an ion separation and collection electrode 3, a hollow optical fiber 4, and a metal vapor supply system 5;

[0020] Hollow-core optical fiber 4 is arranged in a straight line. One end face of hollow-core optical fiber 4 serves as laser incident end face 41, and a laser system 1 and an optical focusing system 2 are arranged nearby on the outside. The other end face serves as metal vapor incident end face 42, and a metal vapor supply system 5 is arranged nearby on the outside. The laser emitted by the laser system 1 is focused by the optical focusing system 2 onto the laser incident end face 41 of hollow-core optical fiber 4, coupled into the hollow-core optical fiber and transmitted. After passing through the hollow-core optical fiber 4, it exits from the metal vapor incident end face 42. The output end of the metal vapor supply system 5 is connected to the metal vapor incident end face 42 through a pipe. The metal vapor supply system 5 provides metal vapor and outputs metal atomic vapor into the hollow-core optical fiber 4. Ion separation and collection electrodes 3 for positive and negative ion separation and collection are arranged around the laser incident end face 41 of hollow-core optical fiber 4. The focal point of the optical focusing system 2 is located at the exact center of the laser incident end face 41.

[0021] More specifically, the laser system 1, the optical focusing system 2, and the ion separation and collection electrode 3 are arranged at one end of the laser incident face 41. The ion separation and collection electrode 3 is horizontally mounted between the laser incident face 41 and the laser system 1. The emission direction of the laser system 1 is perpendicular to the laser incident face 41. The optical focusing system 2 is arranged inside the ion separation and collection electrode 3. The optical focusing system 2 is perpendicular to the emission direction of the laser system 1. The focal point of the optical focusing system 2 is located at the exact center of the laser incident face 41 to ensure that the laser beam is coupled into the hollow fiber 4 with maximum efficiency. The metal vapor supply system 5 is arranged at one end of the metal vapor incident face 42. The steam outlet of the metal vapor supply system 5 is connected to the metal vapor incident face 42 through a pipe to transport the required working metal atomic vapor into the hollow fiber 4.

[0022] In specific implementation, laser system 1 includes a laser and a laser frequency lock; the laser is generated by the laser, which provides the energy to excite the ionization of metal atoms, and then connected to the laser frequency lock. The laser is emitted after the laser frequency lock performs precise frequency selection processing on the laser frequency.

[0023] Among these requirements, the wavelength range of the laser generated by the laser must cover the required working wavelength, and the laser photon energy must be greater than the energy required to excite the ionization of metal atoms; the laser emitted after processing by the laser frequency lock should satisfy the requirement for excitation and ionization of metal atoms and avoid lasers that excite and ionize other atoms besides metal atoms.

[0024] The laser focusing system 2 mainly consists of a series of multiple lenses. The laser is transmitted and focused by the series of multiple lenses to the center of the laser incident end face 41 to ensure the maximum efficiency of the laser beam incident into the hollow core fiber, and then enters the hollow core fiber 4 and propagates along the cavity inside the hollow core fiber 4 and then exits from the metal vapor incident end face 42. The hollow core fiber 4 is a reaction chamber for the laser to excite the metal atoms from one state to another excited state.

[0025] The ion separation and collection electrode 3 mainly consists of a pair of flat plate electrodes arranged on both sides of the laser incident end face 41. The electric field force generated between the pair of flat plate electrodes is perpendicular to the exit direction of the laser system 1. The ion separation and collection electrode 3 separates the ionized metal ions from other neutral state metal atoms and collects the ionized metal ions.

[0026] More specifically, the metal atom vapor output by the metal vapor supply system 5 into the hollow core fiber 4 is opposite to the direction of movement of the laser inside the hollow core fiber 4.

[0027] The metal atom vapor is, for example, barium vapor, platinum vapor, tungsten vapor, thallium vapor, and uranium vapor.

[0028] The process of exciting and collecting metal ions using this excitation and collection device is as follows:

[0029] The laser emitted by the laser system 1 is coupled into the hollow core fiber 4 from the laser incident end face 41 of the hollow core fiber 4 in parallel to the hollow core fiber 4, and at the same time, the metal atom vapor emitted by the metal vapor supply system 5 is introduced into the hollow core fiber 4 from the metal vapor incident end face 42 of the hollow core fiber 4 in the opposite direction of the laser incidence, so that the metal atom vapor and the laser move towards each other in the hollow core fiber. The metal atoms and the laser photons collide with each other in the hollow core fiber 4. The metal atoms absorb photon energy and are excited from one state to another state, so that the final metal atoms are excited into metal ions, and then the excited metal ions and the unexcited metal atoms are emitted from the hollow core fiber. After being emitted, the excited ionized metal ions and the unexcited metal atoms are separated from each other by the electric field force of the ion separation and collection electrode 3 due to the directional movement of the metal ions in the electric field, and the metal ions are collected.

[0030] In a specific implementation, the laser is focused by the optical focusing system 2 to the center of the end face of the hollow core fiber 4 and then incident into the hollow core fiber 4.

[0031] The photon energy of the laser must be greater than the energy required to excite the metal atoms to ionize, and the laser must satisfy the requirement of exciting the metal atoms to ionize and avoid exciting other atoms except the metal atoms.

[0032] The excited metal ions and the unexcited metal atoms are driven by the metal atom vapor to exit from the laser incidence end face 41 of the other end of the hollow core optical fiber 4, that is, the exiting direction is consistent with the direction of the metal atom vapor entering, and is opposite to the laser incidence direction. The metal ions are immediately adsorbed and collected by the electric field force of the ion separation and collection electrode 3 after exiting, and the direction of the electric field force is perpendicular to the exiting direction.

[0033] The above specific embodiments are used to explain and illustrate the present application, rather than limit the present application, and any modification and change made to the present application within the spirit and protection scope of the present application and the claims, fall into the protection scope of the present application.

Claims

1. A hollow-core optical fiber confined gas excitation and collection device, characterized in that: The system includes a laser system (1), an optical focusing system (2), an ion separation and collection electrode (3), a hollow fiber (4), and a metal vapor supply system (5). One end face of the hollow fiber (4) serves as the laser incident end face (41), and the laser system (1) and the optical focusing system (2) are arranged nearby. The other end face serves as the metal vapor incident end face (42), and the metal vapor supply system (5) is arranged nearby. The laser emitted by the laser system (1) is focused by the optical focusing system (2) onto the laser incident end face of the hollow fiber (4). (41) After passing through the hollow fiber (4), it exits from the metal vapor incident end face (42); the output end of the metal vapor supply system (5) is connected to the metal vapor incident end face (42) through a pipe. The metal vapor supply system (5) is used to output metal atomic vapor into the hollow fiber (4). Ion separation and collection electrodes (3) for positive and negative ion separation and collection are set around the laser incident end face (41) of the hollow fiber (4); the focal point of the optical focusing system (2) is located at the center of the laser incident end face (41).

2. The hollow-core optical fiber confined gas excitation and collection device according to claim 1, characterized in that: The laser system (1) includes a laser and a laser frequency lock; the laser is generated by the laser and then connected to the laser frequency lock, and the laser is emitted after being processed by the laser frequency lock.

3. The hollow-core optical fiber confined gas excitation and collection device according to claim 2, characterized in that: The laser generated by the laser covers the required operating wavelength and the photon energy is greater than the energy required to excite the ionization of metal atoms; the laser emitted after being processed by the laser frequency lock device satisfies the requirement for ionization of metal atoms and avoids ionizing other atoms.

4. The hollow-core optical fiber confined gas excitation and collection device according to claim 1, characterized in that: The optical focusing system (2) is mainly composed of multiple lenses. The laser is transmitted and focused through multiple lenses to the center of the laser incident end face (41), and then coupled into the hollow fiber (4) and propagated along the cavity inside the hollow fiber (4) before exiting from the metal vapor incident end face (42).

5. The hollow-core optical fiber confined gas excitation and collection device according to claim 1, characterized in that: The ion separation and collection electrode (3) is mainly composed of a pair of plate electrodes, which are respectively arranged on both sides of the laser incident end face (41). The direction of the electric field force generated between the pair of plate electrodes is perpendicular to the emission direction of the laser system (1).

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