阅读说明：本技术 一种太赫兹波远距离准光传输系统 (terahertz wave long-distance quasi-optical transmission system ) 是由 刘頔威 曹毅超 王维 宋韬 陈强 于 2019-10-09 设计创作，主要内容包括：该发明为一种太赫兹波远距离准光传输系统,其特点是它能够将准高斯分布的太赫兹波远距离传输、实现相位矫正、并且波束汇聚的功能。对于DNP-NMR系统,能够产生一定功率太赫兹源的回旋管与核磁共振系统均需要一个单独的磁场环境,两个独立的系统若是离得过进,则容易导致各自磁场的相互影响,从而严重影响互相的工作环境；太赫兹波远距离准光传输系统则是为了满足使这两个大工作系统各自拥有稳定工作的磁场环境而设计的。(The invention relates to an terahertz wave remote quasi-optical transmission system, which is characterized in that the system can remotely transmit terahertz waves with quasi-Gaussian distribution, realize phase correction and beam convergence, wherein for a DNP-NMR system, a gyrotron and a nuclear magnetic resonance system which can generate a terahertz source with constant power both need independent magnetic field environments, if the two independent systems are too far away, the mutual influence of respective magnetic fields is easily caused, so that the mutual working environments are seriously influenced, and the terahertz wave remote quasi-optical transmission system is designed for meeting the requirement that the two large working systems respectively have the magnetic field environments with stable working.)

The remote terahertz wave quasi-optical transmission system is characterized by comprising 6 mirror surfaces, wherein alignment parabolic mirrors are used for converging and transmitting beams, optical path adjustment is realized on the plane mirrors, and alignment parabolic mirrors and plane mirrors added with perturbation (the phase correction function is realized).

2. The kinds of terahertz wave long-distance quasi-optical transmission system according to claim 1, wherein the system uses off-axis parabolic mirrors in pairs to achieve the function of converging and controlling beams under the condition of reducing beam distortion.

3. A remote quasi-optical transmission system of THz waves as claimed in claim 1, wherein two plane mirrors are used to adjust the optical path, and a phase correcting mirror is installed at the end to perform the functions of phase correction and beam focusing.

4. A remote quasi-optical transmission system of THz waves as claimed in claim 1, wherein the flexible use of the polygon mirror realizes the function of beam transmission at a longer distance.

5. A remote quasi-optical transmission system of THz waves as claimed in claim 1, wherein said system is operated in a nitrogen filled enclosure to achieve low attenuation THz wave transmission.

Technical Field

The invention relates to wave beam transmission correction systems applied to terahertz quasi-Gaussian wave beams of DNP-NMR, belonging to the technical field of high-power terahertz wave transmission.

Background

Nuclear Magnetic Resonance (NMR) is a Nuclear with a non-zero Magnetic moment, and the Nuclear Magnetic Resonance is a physical process in which a spin level undergoes zeeman splitting under the action of an external Magnetic field and resonates to absorb electromagnetic radiation of a specific frequency . due to the high resolution of the NMR spectrum, as spectrum analysis methods, NMR has been widely used in the fields of physics, chemistry, material science, and biomedicine.

Dynamic Nuclear Polarization (DNP) is important means in nmr spectroscopy, techniques combining electron spin resonance with nmr, which can greatly increase the difference Δ n between the Nuclear spin level particle numbers, and thus the nmr signal intensity is also greatly enhanced, and electromagnetic wave-driven Dynamic Nuclear Polarization is well-known effective methods for enhancing solid/liquid nmr spectra and imaging signals, increasing the magnetic field strength can increase the energy level separation, increasing the difference Δ n between the spin level particle numbers, and thus increasing the nmr sensitivity.

The energy level interval can be increased by increasing the magnetic field intensity, and the difference delta n of the number of the spin energy level particles is increased, so that the sensitivity of nuclear magnetic resonance is improved. Modern nuclear magnetic resonance spectroscopy is evolving towards high fields. A terahertz gyrotron which is a fast wave gyrotron developed based on an electron cyclotron stimulated radiation principle is used as a terahertz radiation source of DNP-NMR. At the same time, in order to match the transmission line to improve the coupling efficiency, the output field distribution of the radiation source is required to be ideal or close to ideal free space gaussian distribution.

Because of the limited space of the sample, the tail end of the transmission system needs to feed energy from corrugated waveguides with larger radius into corrugated waveguides with smaller radius for transmission, and optical reflector sets are needed for realizing the process, and the quasi-Gaussian beams are focused and transmitted into the NMR.

Disclosure of Invention

The invention aims to improve a mirror system in the existing DNP-NMR (digital nuclear magnetic resonance) end transmission system, and provides transmission systems which can realize longer-distance transmission of terahertz waves and can carry out phase correction at the output end, wherein the mirror system is positioned at the output end of a larger-radius corrugated waveguide at the end transmission line of the DNP-NMR system and consists of six mirrors, wherein the th mirror is a pair off-axis parabolic mirror, and a concave parabolic mirror is used in pairs to improve the distortion caused by off-axis reflection;

the purpose of the invention is realized by the following technical measures:

the transmission system structure is composed of five mirrors, wherein the front two mirrors are used for converging and controlling beams, the middle two mirrors are used for controlling light paths, and finally phase correction mirrors are used for carrying out phase correction on the beams.

A base of the transport system.

Mirror support for a transmission system.

A nitrogen enclosure of the transport system;

the invention has the following advantages:

compared with the traditional terahertz wave transmission line, the transmission system can realize the transmission of the terahertz wave at a longer distance; a phase correction lens is added at the tail end of the transmission section, so that the phase correction function can be realized;

drawings

Fig. 1 is a right side view of a terahertz wave long-distance quasi-optical transmission system.

Fig. 2 is a left side view of the terahertz wave long-distance quasi-optical transmission system.

FIG. 3 is a top view of a terahertz wave long-distance quasi-optical transmission system.

In the figure, position 1 and position 2 are shown for an off-axis parabolic mirror, position 3 and position 4 are shown as plane mirrors, position 5 is shown as an off-axis parabolic mirror, position 6 is shown as a phase correction mirror, position 7 and position 8 are shown as an input port and an output port, respectively, position 9 is shown as a base of the delivery system, and position 10 is shown as a cover of the system, which is used to maintain the delivery system in a high-concentration nitrogen environment.

Detailed Description

The present invention is described in detail below with reference to the following examples, it should be noted that the present example is only for steps and should not be construed as limiting the scope of the present invention, and those skilled in the art can make insubstantial modifications and adaptations based on the above disclosure.