Hollow-core optical fiber confinement gas excitation collection method and device

Abstract

The invention discloses a hollow-core optical fiber confinement gas excitation and collection method and 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 invention relates to the field of atomic excitation, and in particular to a hollow-core optical fiber confined gas excitation collection method and device based on laser excitation. Background Art

[0002] Laser-induced atomic ionization is an important aspect of laser technology application. It not only has potential economic value and great application prospects, but also has great scientific significance. The basic principle of laser separation of atoms is to use laser to selectively excite target atoms and suppress the excitation of other adjacent atoms. Because the neutrons of isotope nuclei are different, their energy levels will undergo isotope shifts, and the wavelengths of the emitted radiation will have small differences. The laser has good monochromaticity, and can use the same wavelength as the radiation of a certain isotope nucleus to excite a certain isotope, without exciting other isotopes together. That is, the laser can be used to excite and ionize a certain isotope atom in the isotope atomic group first; then the ionized atoms are "pulled" out of the isotope mixture by an electric field, and these atoms can be excited to high-energy levels. Atoms are separated, and the desired isotope atoms are obtained after aggregation. Based on the excellent monochromaticity of lasers and the isotope spectral shift of atomic nuclei, laser separation of isotope atoms can be achieved, that is, the laser is used to selectively excite the target isotope and suppress the excitation of other isotopes, so that the concentration of a certain isotope can be achieved.

[0003] With the development of optical fiber technology, especially the development and application of hollow-core optical fiber technology, the existing technology lacks the device and method to realize laser-induced atomic separation using optical fiber performance. Summary of the invention

[0004] In order to solve the problems existing in the background technology and break through the existing technology, the present invention proposes a method and device for exciting and collecting metal ions by confining gas with a hollow core optical fiber.

[0005] The specific technical solutions of the present invention are as follows:

[0006] 1. A hollow-core optical fiber confined gas excitation collection device:

[0007] The device comprises a laser system, an optical focusing system, an ion separation and collection electrode, a hollow-core optical fiber and a metal vapor supply system; one end face of the hollow-core optical fiber is used as a laser incident end face and the laser system and the optical focusing system are arranged nearby, and the other end face is used as a metal vapor incident end face and the metal vapor supply system is arranged nearby; the laser emitted by the laser system is focused to the laser incident end face of the hollow-core optical fiber by the optical focusing system, and then emitted from the metal vapor incident end face after passing through the hollow-core optical fiber; the output end of the metal vapor supply system is connected to the metal vapor incident end face through a pipeline, and the metal vapor supply system is used to output metal atomic vapor into the hollow-core optical fiber; ion separation and collection electrodes for separating and collecting positive and negative ions are arranged near the laser incident end face of the hollow-core optical fiber; the focus of the optical focusing system is located at the exact center of the laser incident end face.

[0008] The laser system comprises a laser and a laser frequency locker; the laser is generated by the laser and then connected to the laser frequency locker, and the laser is emitted after being processed by the laser frequency locker.

[0009] The wavelength band of the laser generated by the laser covers the required working wavelength and the photon energy is greater than the energy of exciting the ionization of metal atoms; the laser emitted after being processed by the laser frequency locker should satisfy the requirements of exciting the ionization of the metal atoms and avoid exciting the ionization of other atoms.

[0010] The laser focusing system is mainly composed of multiple lenses. The laser is transmitted and focused to the center of the laser incident end face through the multiple lenses, and then coupled into the hollow core optical fiber and propagates along the cavity inside the hollow core optical fiber and then emerges from the metal vapor incident end face.

[0011] The ion separation and collection electrode is mainly composed of a pair of flat electrodes, which are respectively arranged on both sides of the laser incident end face, and the direction of the electric field force generated between the pair of flat electrodes is perpendicular to the emission direction of the laser system.

[0012] The metal atomic vapor is, for example, barium vapor, platinum vapor, tungsten vapor, thorium vapor, uranium vapor, etc.

[0013] 2. A hollow-core optical fiber confined gas excitation collection method:

[0014] The method comprises the following steps: a laser is emitted by a laser system and incident into the hollow-core optical fiber from the laser incident end face of the hollow-core optical fiber; at the same time, a metal vapor supply system provides metal atomic vapor to pass into the hollow-core optical fiber from the metal vapor incident end face of the hollow-core optical fiber in the opposite direction of the laser incident, so that the metal atomic vapor and the laser travel toward each other in the hollow-core optical fiber; the metal atomic vapor and the laser collide with each other in the hollow-core optical fiber, the metal atoms absorb the photon energy and are excited to become metal ions, and then the metal ions and the metal atoms are emitted from the hollow-core optical fiber together; after the emission, the metal ions are collected by the electric field force of the ion separation and collection electrode.

[0015] The laser is focused to the center of the laser incident end face of the hollow core optical fiber through an optical focusing system and then incident into the hollow core optical fiber.

[0016] The photon energy of the laser is greater than the energy for exciting the ionization of metal atoms. The laser is a laser that can satisfy the requirement of exciting the ionization of metal atoms and avoid exciting the ionization of other atoms.

[0017] The metal ions and metal atoms are driven by the metal atom vapor and emitted from the other end of the hollow-core optical fiber.

[0018] After being emitted, the metal ions are immediately adsorbed and collected by the electric field force of the ion separation and collection electrode, and the direction of the electric field force is perpendicular to the emission direction.

[0019] Beneficial effects of the present invention:

[0020] The hollow-core fiber confined gas excitation collection device proposed in the present invention confines the laser and metal atom vapor in the hollow-core fiber, greatly increasing the collision probability between photons and metal atoms and the ionization rate of metal atoms. Secondly, the present invention has a simple and compact structure, which can greatly realize the miniaturization of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the hollow-core fiber confined gas excitation collection device.

[0022] 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

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0024] Embodiments of the present invention are as follows:

[0025] The schematic diagram of the hollow core optical fiber confined gas excitation collection device of this embodiment is as follows: Figure 1 As shown,

[0026] This embodiment includes a laser system 1, an optical focusing system 2, an ion separation collection electrode 3, a hollow core optical fiber 4 and a metal vapor supply system 5;

[0027] The hollow-core optical fiber 4 is arranged along a straight line, one end face of the hollow-core optical fiber 4 serves as a laser incident end face 41 and a laser system 1 and an optical focusing system 2 are arranged near the outside, and the other end face serves as a metal vapor incident end face 42 and a metal vapor supply system 5 is arranged near the outside. The laser system 1 emits a laser which is focused by the optical focusing system 2 to the laser incident end face 41 of the hollow-core optical fiber 4, coupled into the hollow-core optical fiber and transmitted, and then emitted from the metal vapor incident end face 42 after passing through the hollow-core optical fiber 4; the output end of the metal vapor supply system 5 is connected to the metal vapor incident end face 42 through a pipeline, and 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 separating and collecting positive and negative ions are arranged near the laser incident end face 41 of the hollow-core optical fiber 4; the focus of the optical focusing system 2 is located at the exact center of the laser incident end face 41.

[0028] 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 end face 41, the ion separation and collection electrode 3 is horizontally mounted between the laser incident end face 41 and the laser system 1, the emission direction of the laser system 1 is perpendicular to the laser incident end face 41, the optical focusing system 2 is arranged in the ion separation and collection electrode 3, the optical focusing system 2 is perpendicular to the emission direction of the laser system 1, and the focus of the optical focusing system 2 is located at the exact center of the laser incident end face 41 to ensure that the laser beam is coupled into the hollow core optical fiber 4 with maximum efficiency; the metal vapor supply system 5 is arranged at one end of the metal vapor incident end face 42, the steam outlet end of the metal vapor supply system 5 is connected to the metal vapor incident end face 42 through a pipeline, and the required working metal atom vapor is transported to the hollow core optical fiber 4.

[0029] In a specific implementation, the laser system 1 includes a laser and a laser frequency locker; the laser is generated by the laser, the laser provides energy to excite the ionization of metal atoms, and then is connected to the laser frequency locker, and the laser is emitted after the laser frequency is accurately screened and processed by the laser frequency locker.

[0030] Among them, the wavelength band of the laser generated by the laser must cover the required working wavelength, and the laser photon energy must be greater than the energy to excite the ionization of metal atoms; the laser emitted after being processed by the laser frequency locker should satisfy the needs of exciting the ionization of the metal atoms and avoid exciting the ionization of atoms other than metal atoms.

[0031] The laser focusing system 2 is mainly composed of a series of multiple lenses. The laser is transmitted and focused to the center of the laser incident end face 41 through a series of multiple lenses to ensure that the laser beam is incident into the hollow-core optical fiber with maximum efficiency, and then enters the hollow-core optical fiber 4 and propagates along the cavity inside the hollow-core optical fiber 4 and then emerges from the metal vapor incident end face 42. The hollow-core optical fiber 4 is a reaction cavity for the laser to excite the desired metal atoms from one state to another excited state.

[0032] The ion separation and collection electrode 3 is mainly composed of a pair of flat 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 flat electrodes is perpendicular to the emission direction of the laser system 1. The ion separation and collection electrode 3 separates the ionized metal ions from other metal atoms in a neutral state and collects the ionized metal ions.

[0033] More specifically, the metal atomic vapor output by the metal vapor supply system 5 and entering the hollow-core optical fiber 4 moves in opposite directions to the laser light in the hollow-core optical fiber 4 .

[0034] The metal atomic vapor is, for example, barium vapor, platinum vapor, tungsten vapor, thorium vapor, and uranium vapor.

[0035] The method of using this excitation collection device to excite and collect metal ions is:

[0036] The laser emitted by the laser system 1 is coupled into the hollow core optical fiber 4 from the laser incident end face 41 of the hollow core optical fiber 4 in parallel with the hollow core optical fiber 4, and at the same time, the metal vapor supply system 5 emits metal atomic vapor from the metal vapor incident end face 42 of the hollow core optical fiber 4 in the opposite direction of the laser incident direction, so that the metal atomic vapor and the laser travel toward each other in the hollow core optical fiber; the metal atoms and the laser photons collide with each other in the hollow core optical fiber 4, and the metal atoms absorb the photon energy and are excited from one state to another, so that the metal atoms are finally excited into metal ions, and then the excited metal ions and the unexcited metal atoms are emitted from the hollow core optical fiber together; after the emission, the electric field force of the ion separation and collection electrode 3 is applied, and due to the directional movement of the metal ions in the electric field, the excited ionized metal ions and the unionized metal atoms are separated from each other, and the metal ions are collected.

[0037] In a specific implementation, the laser is focused to the center of the end face of the hollow-core optical fiber 4 by the optical focusing system 2 and then incident into the hollow-core optical fiber 4 .

[0038] The photon energy of the laser must be greater than the energy for exciting the ionization of metal atoms, and the laser is a laser that can satisfy the requirements for exciting the ionization of metal atoms and avoid exciting the ionization of atoms other than metal atoms.

[0039] The excited metal ions and the unexcited metal atoms are driven by the metal atom vapor to be emitted from the laser incident end face 41 at the other end of the hollow core optical fiber 4, that is, the emission direction is consistent with the introduction direction of the metal atom vapor and opposite to the laser injection direction. Immediately after the metal ions are emitted, they are adsorbed and collected by the electric field force of the ion separation and collection electrode 3, and the direction of the electric field force is perpendicular to the emission direction.

[0040] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A hollow-core optical fiber confined gas excitation collection device, characterized in that: The invention comprises a laser system (1), an optical focusing system (2), an ion separation and collection electrode (3), a hollow-core optical fiber (4) and a metal vapor supply system (5); one end face of the hollow-core optical fiber (4) is used as a laser incident end face (41) and the laser system (1) and the optical focusing system (2) are arranged nearby, and the other end face is used as a metal vapor incident end face (42) and the metal vapor supply system (5) is arranged nearby; the laser system (1) emits laser light which is focused to the laser incident end face of the hollow-core optical fiber (4) through the optical focusing system (2). (41), and then exits from the metal vapor incident end face (42) after passing through the hollow core optical fiber (4); the output end of the metal vapor supply system (5) is connected to the metal vapor incident end face (42) through a pipeline, and the metal vapor supply system (5) is used to output metal atomic vapor into the hollow core optical fiber (4); and ion separation and collection electrodes (3) for separating and collecting positive and negative ions are arranged around the laser incident end face (41) of the hollow core optical fiber (4); the focus of the optical focusing system (2) is located at the exact center of the laser incident end face (41).

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

3. A hollow core fiber confined gas excitation collection device according to claim 2, characterized in that: The wavelength band of the laser generated by the laser covers the required working wavelength and the photon energy is greater than the energy of exciting the ionization of metal atoms; the laser emitted after being processed by the laser frequency locker meets the requirements of exciting the ionization of the metal atoms and avoids exciting the ionization of other atoms.

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

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

6. A hollow-core fiber confined gas excitation collection method based on the hollow-core fiber confined gas excitation collection device according to any one of claims 1 to 5, characterized in that: The method is: A laser is emitted by a laser system (1) and incident into the hollow core optical fiber (4) from a laser incident end face (41) of the hollow core optical fiber (4), and at the same time, a metal vapor supply system (5) provides metal atomic vapor to pass into the hollow core optical fiber (4) from a metal vapor incident end face (42) of the hollow core optical fiber (4) in a direction opposite to the laser incident direction, so that the metal atomic vapor and the laser travel in opposite directions in the hollow core optical fiber; The metal atom vapor and the laser collide with each other in the hollow core optical fiber (4), the metal atoms absorb the photon energy and are excited into metal ions, and then the metal ions and the metal atoms are emitted from the hollow core optical fiber together; After emission, the metal ions are collected by the electric field force of the ion separation and collection electrode (3).

7. A hollow-core optical fiber confined gas excitation collection method according to claim 6, characterized in that: The laser is focused by an optical focusing system (2) to the center of the laser incident end face (41) of the hollow core optical fiber (4) and then incident into the hollow core optical fiber (4).

8. The hollow-core optical fiber confined gas excitation collection method according to claim 6, characterized in that: The photon energy of the laser is greater than the energy for exciting the ionization of metal atoms. The laser is a laser that can satisfy the requirement of exciting the ionization of metal atoms and avoid exciting the ionization of other atoms.

9. A hollow core fiber confined gas excitation collection method according to claim 6, characterized in that: The metal ions and metal atoms are driven by the metal atom vapor and emitted from the other end of the hollow core optical fiber (4).

10. The hollow-core optical fiber confined gas excitation collection method according to claim 6, characterized in that: Immediately after the metal ions are emitted, they are adsorbed and collected by the electric field force of the ion separation and collection electrode (3), and the direction of the electric field force is perpendicular to the emission direction.

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