CN110492338B - Space access type liquid pool for terahertz radiation generation - Google Patents

Space access type liquid pool for terahertz radiation generation Download PDF

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Publication number
CN110492338B
CN110492338B CN201910854315.5A CN201910854315A CN110492338B CN 110492338 B CN110492338 B CN 110492338B CN 201910854315 A CN201910854315 A CN 201910854315A CN 110492338 B CN110492338 B CN 110492338B
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surface wall
liquid pool
terahertz radiation
diameter
radiation generation
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CN110492338A (en
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付博
何伯衢
徐立军
尚策
孙江涛
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Beihang University
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Beihang University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H01S1/04—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range liquid

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  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract

The invention discloses a space access type liquid pool for terahertz radiation generation, which relates to the technical field of photoelectricity, and comprises: a liquid pool main body and a temperature control base. The liquid pool main body is arranged on the temperature control base, and the liquid pool main body is attached to the temperature control base. The liquid pool main body comprises a left surface wall, a lens frame, a front surface wall, a rear surface wall, a right surface wall, a filter holder, a bottom surface wall, a bottom interface and a top surface wall; the lens frame is embedded in the middle of the left surface wall; the bottom interface is arranged at the two symmetrical sides of the lowest part of the bottom surface wall; the filter sheet is arranged on the right surface wall. And a thermal resistance wire or a semiconductor refrigerating sheet is arranged below the surface of the semi-cylinder of the temperature control base and used for heating or refrigerating. The invention has compact structure and simple method, and simultaneously realizes the functions of temperature control, dispersion optimization, integrated filter, liquid supplement circulation and the like.

Description

Space access type liquid pool for terahertz radiation generation
(I) technical field
The invention relates to the technical field of photoelectricity, in particular to a liquid pool for terahertz radiation generation.
(II) background of the invention
Terahertz (THz, 10)12Hz) radiation between the electronic and photonic bands, in the narrow range of 0.1-10THz and in the broad range of 0.3-30 THz. . Terahertz radiation has the characteristics of characteristic spectrum, low photon energy, strong penetrating power, high time-space resolution, large bandwidth and the like, and has irreplaceable application in the fields of terahertz time-domain spectroscopy, nondestructive testing, terahertz radar, wireless communication and the like.
The terahertz radiation is generated by focusing plasma formed by using a bicolor field femtosecond laser pulse (a fundamental frequency pulse and a second harmonic pulse thereof) in a gas medium, and is one of the main popular methods for generating the terahertz radiation. In the end of 2017, a new method for generating terahertz radiation appears, wherein the terahertz radiation is generated by the interaction of femtosecond laser pulses in a liquid medium, and terahertz radiation with high conversion efficiency and wide bandwidth can be generated [ appl.phys.lett.,2017,111,071103; com., 2017,8, 1184 ].
However, the liquid pool that adopts in the experiment is mostly the cell of mid infrared silicon material, and the function is single, and incident laser can introduce the dispersion of material through preceding table wall, and the later stage need add filter filtering visible light and mid infrared light in the light path, and can not regulate and control the liquid temperature. The interaction of ultrafast laser and liquid medium to generate terahertz radiation is a very potential subject. From the perspective of industrialization and scientific research, the liquid pool, which is a key component in the method, has a great lifting space and needs to be further optimized.
Disclosure of the invention
In order to solve the technical problems, the invention designs the liquid pool for terahertz radiation generation, which has the characteristics of a temperature control system, optimized dispersion, integrated filter and realization of liquid supplement circulation.
In a first aspect, an embodiment of the present invention provides a liquid pool for terahertz radiation generation, including: a liquid pool main body and a temperature control base. The liquid pool main body is arranged on the temperature control base, and the liquid pool main body is attached to the temperature control base. The liquid pool main body comprises a left surface wall, a lens frame, a front surface wall, a rear surface wall, a right surface wall, a filter holder, a bottom surface wall, a bottom interface and a top surface wall. The lens holder is embedded in the middle of the left surface wall. The bottom interface is symmetrically arranged on two sides of the lowest part of the bottom surface wall. The filter sheet is arranged on the right surface wall.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, where an outer contour of the left surface wall is an irregular curve and includes a combination of a semicircle and a rectangle; the diameter range of the semicircle is 4-10cm, the length of the long side of the rectangle is equal to that of the semicircle, and the length of the short side of the rectangle is 2-5 cm; the left surface wall is provided with a circular opening at the center of the semicircular circle, and the diameter of the opening can be 2.54cm, 3cm or 5.08 cm; the circular opening of the left surface wall is provided with internal threads; the material of the left surface wall can be fused quartz, glass, plastic or metal; the thickness of the left surface wall ranges from 3cm to 5 cm. The lens holder is provided with an external thread matched with the internal thread of the circular opening on the left surface wall; the lens holder has a diameter matching the left front wall circular opening; the lens holder is initially equipped with lenses, which may be BK7 or uv fused silica, the focal diameter of which is preferably the length of the long side of the associated front wall.
In combination with the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the material of the front surface wall may be fused quartz, glass, plastic, or metal; the side length of the short side of the front surface wall is equal to that of the short side of the left surface wall rectangle; the thickness of the front surface wall is 1-3 cm.
With reference to the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the material of the rear surface wall may be fused quartz, glass, plastic, or metal; the side length of the short side of the rear surface wall is equal to that of the short side of the left surface wall rectangle; the thickness of the surface wall of the back surface wall is 1-3 cm.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the material of the right surface wall is mid-infrared silicon; the surface wall thickness of the right surface wall is 0.5-1 cm; the outer contour of the right surface wall is the same as the outer contour of the left surface wall.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein a projection of the filter frame on the rear surface wall is a half-ring shape, and an outer diameter length R of the half-ring shape1Equal to the semi-circular diameter of the outer contour of the left surface wall and the semi-circular outer diameter R1And inner diameter R2Difference d of2The range is 3-6 cm; the filter holder can be used for holding 1-3 filters, and the length of the outer diameter of each filter is equal to the semi-annular outer diameter R of the filter holder1Length of (d). Depth d of filter plate frame in semi-annular cylinder needing to be planed1In the range of 1-3cm, a thickness d to be planed3The range is 1-4 mm.
With reference to the first aspect, embodiments of the present invention provide a sixth possible implementation manner of the first aspect, where the bottom surface wall is in a shape of a half cylinder, a circular diameter of the half cylinder is the same as a semicircular diameter of the left surface wall, and a material of the bottom surface wall may be fused quartz, glass, plastic, or metal; the thickness of the bottom surface wall may be 1-3 cm; the outer diameter of the bottom interface is 6, 8 and 10 mm; the bottom interface can be butted with a circulating liquid pump through a standard pipeline to carry out self circulation and supplement liquid; the bottom port is provided with an external thread and can be closed by a blind plate when not connected with the liquid pump.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the shape of the top surface wall is a rectangle, a long side of the rectangle is equal to a long side length of the surface wall, and a short side of the rectangle is equal to a long side length of the front surface wall rectangle; the top surface wall has a circular hole with a diameter of 6-10mm for injecting liquid. The material of the top surface wall can be fused quartz, glass, plastic or metal; the thickness of the bottom surface wall may be 1-3 cm.
In a second aspect, an embodiment of the present invention further provides a temperature control method, where a thermal resistance wire or a semiconductor cooling plate is disposed below the surface of the semi-cylinder of the temperature control base for heating or cooling.
Through reasonable design, the invention has the following advantages:
1. the front surface wall is embedded into the lens holder, so that the introduction of the dispersion of the original front surface wall material is reduced, and the terahertz radiation can be generated more effectively;
2. the rear surface wall is provided with a filter holder, and various filters can be directly placed to obtain pure terahertz radiation;
3. the liquid pool has a temperature control function, and is convenient for scientific research experiments and factory output of terahertz radiation generated by liquid at different temperatures;
4. the liquid pool has pipeline interface in the bottom wall for liquid replenishing and circulating.
(IV) description of the drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid pool for terahertz radiation generation, which comprises a left side view, a top view, a right side view and a side view.
Fig. 2 is a schematic diagram of a specific embodiment of a liquid pool for terahertz radiation generation.
The figures are numbered:
000: laser pulse, 001: filter, 002: terahertz pulse, 110: left front wall, 111: lens holder, 120: front surface wall, 130: rear surface wall, 140: right exterior wall, 150: filter frame, 160: bottom surface wall, 161: bottom interface, 162: bottom interface, 170: top surface wall, 200: temperature control base
(V) detailed description of the preferred embodiments
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will explain the principles of the invention in the future and will thereby enable others skilled in the art to understand the invention for embodiments and with various modifications as are suited to the particular use contemplated. In the drawings, like numbering may be used to designate like elements throughout the specification and the drawings.
For the understanding of the present embodiment, firstly, a detailed description is given to a liquid pool for terahertz radiation generation disclosed in the embodiment of the present invention, referring to a schematic structural diagram of a liquid pool for terahertz radiation generation shown in fig. 1, the liquid pool includes: left face wall 110, lens holder 111, front and rear face walls 120 and 130, right face wall 140, filter holder 150, bottom face wall 160, bottom ports 161 and 162, and top face wall 170. The lens holder 111 is embedded in the middle of the left front wall 110. The bottom ports 161 and 162 are symmetrically located on either side of the bottom surface wall at its lowest elevation. The filter frame 150 is on the right face wall 140. A thermal resistance wire or a semiconductor refrigerating plate is disposed under the surface of the semi-cylinder of the temperature control base 200 for heating or refrigerating. The bottom ports 161 and 162 may be selectively closed or connected to a water pump via a water pipe for fluid circulation.
Further, for the convenience of understanding, the embodiment of the present invention provides another schematic diagram of a liquid pool for terahertz radiation generation, and referring to the schematic structural diagram of another schematic diagram of a liquid pool for terahertz radiation generation shown in fig. 2, as shown in fig. 2, a laser pulse 000 with a center wavelength of 800nm, a pulse width of 100fs, and a single pulse energy of 0.5mJ will be transmitted through the liquid pool of the present invention to generate terahertz radiation. In this embodiment, the material of the left surface wall 110, the front surface wall 120, the rear surface wall 130, the filter holder 150, the bottom surface wall 160, and the top surface wall 170 of the liquid tank main body is preferably fused quartz; the right surface wall 140 is made of mid-infrared silicon and has high transmittance for terahertz radiation; the temperature controlled base 200 is preferably made of teflon organic material. The length and width of the liquid pool are preferably 100mm and 60mm, the thickness of the front surface wall 120, the rear surface wall 130, the top surface wall 170, and the bottom surface wall of the liquid pool are all preferably 10mm, the thickness of the left surface wall 110 of the liquid pool is preferably 30mm, and the thickness of the right surface wall 140 of the liquid pool is preferably 5 mm. The laser pulses 000 pass through a lens-mounted lens holder 111 embedded in the front face wall 110 of the liquid bath. The ethanol liquid is injected from the holes in the top surface wall 170 of the liquid pool to fill the whole liquid pool (the liquid is hidden in the figure).
Laser pulses 000 are incident into the liquid through a lens holder 111, perpendicular to the left fluid reservoir wall 110. The focal length of the lens is preferably 100 mm. The laser pulse interacts with the ethanol liquid to generate a nonlinear process, terahertz radiation is generated, and meanwhile, a super-continuum spectrum is generated. The radiation that finally produces is through right surface wall 140 outgoing, has placed filter 001 on filter frame 150, includes: 1 high-resistance silicon wafer with the diameter of 50mm and the thickness of 1mm and 2 ultrahigh-density polyethylene wafers, visible light and intermediate infrared light can be filtered by emitted radiation pulses 002 after passing through the filter, and radiation of the terahertz waveband is obtained. The temperature control base 200 is provided with a thermal resistance wire or a semiconductor refrigerating sheet, and can heat up or cool down the liquid pool main body, so that the generation efficiency of terahertz radiation can be adjusted.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (9)

1. A spatially-accessed liquid cell for terahertz radiation generation, comprising: the space access type liquid pool comprises a liquid pool main body and a temperature control base; the space access type liquid pool main body is arranged on the temperature control base, and the space access type liquid pool main body is attached to the temperature control base; the space access type liquid pool main body comprises a left surface wall, a lens frame, a front surface wall, a rear surface wall, a right surface wall, a filter film frame, a bottom surface wall, a bottom interface and a top surface wall; the lens holder is embedded in the middle of the left surface wall; the bottom interface is arranged at two symmetrical sides of the lowest part of the bottom surface wall; the filter frame is on the right surface wall.
2. The spatially-accessed liquid pool for terahertz radiation generation as claimed in claim 1, wherein the outer contour of the left surface wall is an irregular curve comprising a combination of a semicircle and a rectangle; the diameter range of the semicircle is 4-10cm, the length of the long side of the rectangle is equal to the diameter of the semicircle, and the length of the short side of the rectangle is 2-5 cm; the left surface wall is provided with a circular opening at the center of the semicircular circle, and the diameter of the opening is 2.54cm, 3cm or 5.08 cm; the circular opening of the left surface wall is provided with internal threads; the left surface wall is made of fused quartz, glass, plastic or metal; the thickness range of the left surface wall is 3-5 cm; the lens holder is provided with an external thread matched with the internal thread of the circular opening on the left surface wall; the lens holder has a diameter matching the left front wall circular opening; the lens holder is initially equipped with lenses made of BK7 or ultraviolet fused silica, and the focusing diameter of the lenses is equal to the length of the long side of the front surface wall.
3. The spatially-accessed liquid pool for terahertz radiation generation according to claim 1, wherein the material of the front surface wall is fused quartz, glass, plastic or metal; the length of the short side of the front surface wall is equal to the length of the short side of the left surface wall rectangle; the thickness of the front surface wall is 1-3 cm.
4. The spatially-accessed liquid pool for terahertz radiation generation according to claim 1, wherein the material of the back surface wall is fused quartz, glass, plastic or metal; the length of the short side of the rear surface wall is equal to the length of the short side of the left surface wall rectangle; the thickness of the surface wall of the rear surface wall is 1-3 cm.
5. The spatially-accessed liquid pool for terahertz radiation generation as claimed in claim 1, wherein the material of the right surface wall is mid-infrared silicon; the surface wall thickness of the right surface wall is 0.5-1 cm; the outer contour of the right surface wall is the same as that of the left surface wall.
6. The spatially-accessed liquid pool for terahertz radiation generation as claimed in claim 1, wherein the projection of the filter frame on the back surface wall is a semi-ring shape, and the outer diameter length R of the semi-ring shape is1Equal to the semi-circular diameter of the outer contour of the left surface wall and the outer diameter R of the semi-circular shape1And inner diameter R2Difference d of2The range is 3-6 cm; the filter frame is used for placing 1-3 filters, and the length of the outer diameter of each filter is equal to the semi-annular outer diameter R of the filter frame1Length of (d); the filter plate frame is arranged at the depth d of the semi-annular cylinder needing to be planed1In the range of 1-3cm, a thickness d to be planed3The range is 1-4 mm.
7. The spatially-accessed liquid pool for terahertz radiation generation according to claim 1, wherein the bottom surface wall is in the shape of a half cylinder, the circular diameter of the half cylinder is the same as the semicircular diameter of the left surface wall, and the bottom surface wall is made of fused silica, glass, plastic or metal; the thickness of the bottom surface wall is 1-3 cm; the outer diameter of the bottom interface is 6mm, 8mm or 10 mm; the bottom interface is in butt joint with a circulating liquid pump through a standard pipeline to carry out self circulation and supplement liquid; the bottom port is provided with an external thread and is sealed by a blind plate when not connected with the liquid pump.
8. The spatially-accessed liquid cell for terahertz radiation generation as claimed in claim 1, wherein the top surface wall is rectangular in shape, the long side of the rectangle is equal to the long side of the front surface wall, and the short side of the rectangle is equal to the long side of the left surface wall rectangle; the top surface wall is provided with a circular hole, the diameter of the circular hole is 6-10mm, and the circular hole is used for injecting liquid; the material of the top surface wall is fused quartz, glass, plastic or metal; the thickness of the bottom surface wall is 1-3 cm.
9. The spatially-accessed liquid pool for terahertz radiation generation according to claim 1, wherein a thermal resistance wire or a semiconductor refrigeration piece is disposed below the surface of the semi-cylinder of the temperature-controlled base for heating or refrigeration.
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CN110556689B (en) * 2019-09-10 2021-01-15 北京航空航天大学 Optical fiber access type liquid pool for terahertz radiation generation
CN111029889B (en) * 2020-03-11 2020-09-01 蓝科微电子(深圳)有限公司 Terahertz laser based on single high-temperature heat source

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