CN112670798B - Multi-frequency terahertz wave generating device based on non-collinear cascade optical difference frequency - Google Patents
Multi-frequency terahertz wave generating device based on non-collinear cascade optical difference frequency Download PDFInfo
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Abstract
The invention provides a method for cascading optical difference based on non-collinearityCompared with the existing terahertz radiation source based on the cascade optical difference frequency effect, the multi-frequency terahertz wave generating device (1) can be adjusted by changing the position and the angle of the reflectorθ 1 、θ 2 ……θ n‑1 The method has the advantages of obtaining the terahertz waves with multiple frequencies, simple tuning mode and flexible operation. (2) By changing the position and angle of the reflector, it can be adjustedθ 1 、θ 2 ……θ n‑1 The non-collinear cascade difference frequency is realized, and the terahertz wave conversion efficiency is effectively improved.
Description
Technical Field
The invention belongs to the technical field of terahertz wave application, and particularly relates to a terahertz generation device based on cascade difference frequency.
Background
Terahertz (THz) wave refers to a frequency of 0.1-10 THz (1THz =10) 12 Hz), the band of which lies between the millimetre wave and the infrared in the electromagnetic spectrum, is the transition region from photonics and electronics, macroscopic theory to microscopic theory. The terahertz waves are located at special positions, so that the terahertz waves have great scientific research value and wide application prospects in the basic research fields of physics, chemistry, astronomy, molecular spectrum, life science, medical science and the like, and the application research fields of medical imaging, environment monitoring, material detection, food detection, radio astronomy, mobile communication, satellite communication, military radar and the like. Terahertz waves are mainly applied in the following fields:
(1) Field of imaging
The transient electromagnetic field generated by the terahertz electromagnetic pulse can be directly measured by utilizing the terahertz time-domain spectroscopy technology, and the dielectric constant of a sample can be directly measured.
(2) Field of biochemistry technology
Because the rotation absorption spectrum of a plurality of biomacromolecules is in the terahertz frequency band, the molecular motion condition information in the reaction can be obtained by utilizing the research on the terahertz absorption spectrum of biochemical reaction. Provides a powerful means for further researching the biochemical reaction.
(3) Field of astronomy
In the universe, a large number of substances emit terahertz electromagnetic waves. Carbon (C), water (H) 2 O), carbon monoxide (CO), nitrogen (N) 2 ) Oxygen (O) 2 ) And a large number of molecules can be detected in the terahertz frequency band.
(4) Field of communications
Terahertz waves are good broadband information carriers and can carry audio or video signals for transmission. The terahertz wave is used for communication, and the wireless transmission speed of 10 GB/s can be obtained, which is hundreds to thousands of times faster than the current ultra-wideband technology.
(5) The field of homeland security
In the field of homeland security, due to the non-ionization property and strong penetrability of the terahertz waves, the terahertz waves can provide long-distance and large-range early warning for hidden dangerous goods such as explosives, contraband, weapons, drugs and the like in airports, stations and the like.
The lack of terahertz sources capable of generating high-power, high-quality and high-efficiency terahertz waves and operating at room temperature with low cost is a major problem at present.
Disclosure of Invention
The invention aims to provide a multi-frequency terahertz wave generating device based on non-collinear cascade optical difference frequency, which can generate terahertz waves with multiple frequencies and improve terahertz wave conversion efficiency.
The object of the invention is achieved in the following way:
a multi-frequency terahertz wave generator based on non-collinear cascade optical difference frequency is composed of the first and the second pump sources, APPLN crystal, and LiNbO 3 Crystal of the formula B 1 Reflecting mirror B 1 (ii) item B 2 Reflecting mirror B 2 823060 n Reflecting mirror B n M, M 1 Reflector M 1 M, M 2 Mirror M 2 823060 n Reflector M n C, C 1 Reflecting mirror C 1 (ii) C 2 Reflecting mirror C 2 823060 n Reflecting mirror C n A beam combiner and a phase delay system;
a first pump light emitted from a first pump source enters a beam combining mirror; second pumping light emitted from a second pumping source enters the beam combiner after passing through the phase delay system; the first pump light and the second pump light are combined into a beam of mixed light in the beam combining mirror; the mixed light is incident on the APPLN crystal, and first cascade light 12 is generated through cascade optical difference frequency;
the first cascade light 12 passes through the B 1 Reflecting mirror B 1 After transmission, the light becomes second cascade light G 1 Second cascade light G 1 Through M 1 Mirror M 1 (ii) C 1 Reflecting mirror C 1 Incident MgO LiNbO after reflection 3 A crystal; the first cascade light passes through the B-th 1 Reflecting mirror B 1 After reflection, the light passes through the second lens 2 Reflecting mirror B 2 After reflection, the third cascade light G is formed 2 Third cascade light G 2 Through M 2 Reflector M 2 C, C 2 Reflecting mirror C 2 Incident MgO LiNbO after reflection 3 A crystal 13; the first cascade light 12 passes through the B 2 Reflecting mirror B 2 After transmission, the second layer passes through the second layer 3 Reflecting mirror B 3 After reflection, becomes the fourth-order coupled light G 3 Fourth order coupling G 3 Through M 3 Mirror M 3 C, C 3 Reflecting mirror C 3 Incident MgO LiNbO after reflection 3 A crystal;
by analogy, the first cascade light 12 passes through the B n-1 Reflecting mirror B n-1 After transmission, passes through the second membrane n Reflecting mirror B n After reflection, the light becomes the n +1 cascade light G n The n + 1th cascade light G n Through M n Reflector M n C, C n Reflecting mirror C n Incident MgO LiNbO after reflection 3 Crystal 13, n +1 cascade light G n Not the second cascade light G 1 Or third cascade light G 2 。
Second cascade light G 1 Third cascade light G 2 \8230 ` 8230 `, the n + 1th cascade light G n Incident MgO LiNbO 3 Crystals of LiNbO, thereby passing MgO 3 The crystal generates terahertz waves;
the frequencies of the first pump light and the second pump light are different; the plane of beam propagation is a plane defined by X-axis and Y-axis, the Z-axis is perpendicular to the plane of beam propagation, the initial propagation direction of the first pump light emitted from the first pump source is the X-axis forward direction, and the initial propagation direction of the second pump light emitted from the second pump source is the X-axis forward directionThe initial propagation direction is the positive direction of the Y axis, and the propagation direction of the mixed light is the positive direction of the X axis; propagation direction of terahertz wave and LiNbO 3 The included angle of the vertical direction of the emergent surface of the crystal is 0-10 degrees.
The first pump source adopts a pulse laser, the second pump source adopts a pulse laser, and the polarization directions of the two beams of pump light are both Z-axis.
The phase delay system consists of a first reflector, a second reflector, a third reflector and a fourth reflector, and second pumping light emitted from the second pumping source enters the beam combining mirror after passing through the phase delay system consisting of the first reflector, the second reflector, the third reflector and the fourth reflector.
The first reflector, the second reflector, the third reflector and the fourth reflector are plane mirrors and are used for totally reflecting the second pumping light, and B 1 Reflecting mirror B 1 (ii) item B 2 Reflecting mirror B 2 823060 n Reflecting mirror B n Partially transmitting the first cascade light 12, mth 1 Mirror M 1 M, M 2 Mirror M 2 823060 n Reflector M n C, C 1 Reflecting mirror C 1 C, C 2 Reflecting mirror C 2 823060; \ 8230c n Reflecting mirror C n Totally reflecting the first cascade light 12.
The APPLN crystal is a cuboid, and is rectangular in an X-Y plane, and an optical axis is along a Z axis. MgO LiNbO 3 The crystal is isosceles trapezoid in the X-Y plane, and the optical axis of the crystal is along the Z axis.
Second cascade light G 1 Third cascade light G 2 \8230A (8230); the n + 1th cascade light G n From MgO LiNbO 3 The crystal is incident at an oblique plane in the X-Y plane.
The cascade light is a mixed light of a mixture of cascade lights of a plurality of frequencies, and they travel in a common line. The frequency difference of the cascade light of the adjacent stages is equal to the frequency difference between the first pump light and the second pump light.
Second cascade light G 1 Third cascade light G 2 \8230 ` 8230 `, the n + 1th cascade light G n Incident MgO LiNbO 3 Direction of crystal and incident MgO:LiNbO 3 The included angle of the crystal face in the vertical direction is 0-10 degrees, and the second cascade light G 1 In cascade with the third stage G 2 Included angle therebetween isθ 1 Third cascade light G 2 With fourth level of collimation G 3 Included angle therebetween isθ 2 N-th cascade light G n-1 Cascade light G with n +1 n At an included angle ofθ n-1 . Change of item C 1 Reflecting mirror C 1 C, C 2 Reflecting mirror C 2 823060 n Reflecting mirror C n Can change the position and the angle ofθ 1 、θ 2 ……θ n-1 The high-power terahertz waves are generated through the non-collinear cascade difference frequency.
Compared with the prior art, the multi-frequency terahertz wave generating device based on the non-collinear cascade optical difference frequency has the following advantages compared with the existing terahertz radiation source based on the cascade optical difference frequency effect:
(1) By changing the position and angle of the reflector, it can be adjustedθ 1 、θ 2 ……θ n-1 The method has the advantages of obtaining the terahertz waves with multiple frequencies, simple tuning mode and flexible operation.
(2) By changing the position and angle of the reflector, it can be adjustedθ 1 、θ 2 ……θ n-1 The non-collinear cascade difference frequency is realized, and the terahertz wave conversion efficiency is effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a graph of the correspondence of the phase matching angle to the wavelength of the cascade light when a terahertz wave of a frequency of 0.5 THz is generated.
Detailed Description
While the invention will be described in detail and with reference to the drawings and specific examples, it is to be understood that the invention is not limited to the precise construction and details shown and described herein, but is capable of numerous rearrangements and modifications as will now become apparent to those skilled in the art. In the present invention, unless otherwise specifically defined and limited, technical terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention pertains.
As shown in the attached figure 1, the multi-frequency terahertz wave generation device based on the non-collinear cascade optical difference frequency comprises a first pump source 1, a second pump source 3, an APPLN crystal 11, and a LiNbO 3 Crystal 13, no. B 1 Reflecting mirror B 1 The second one, B 2 Reflecting mirror B 2 823060 n Reflecting mirror B n M, M 1 Mirror M 1 M th 2 Reflector M 2 823060 n Reflector M n (ii) C 1 Reflecting mirror C 1 (ii) C 2 Reflecting mirror C 2 823060 n Reflecting mirror C n A beam combining mirror 9 and a phase delay system.
The first pump light 2 emitted from the first pump source 1 enters the beam combining mirror 9. The second pump light 4 emitted from the second pump source 3 enters the beam combining mirror 9 after passing through the phase delay system. The first pump light 2 and the second pump light 4 are combined into a mixed light beam 10 in a beam combining mirror 9. The mixed light 10 is incident on an APPLN crystal 11, and a first cascade light 12 is generated by a cascade optical difference frequency. The first cascade light 12 passes through the B 1 Reflecting mirror B 1 Becomes cascade light G after transmission 1 Second cascade light G 1 Through M 1 Reflector M 1 (ii) C 1 Reflecting mirror C 1 Incident MgO LiNbO after reflection 3 A crystal 13; the first cascade light 12 passes through the B 1 Reflecting mirror B 1 After reflection, the light passes through the second lens 2 Reflecting mirror B 2 After reflection, the third cascade light G is formed 2 Third cascade light G 2 Through M 2 Reflector M 2 (ii) C 2 Reflecting mirror C 2 Incident MgO LiNbO after reflection 3 A crystal 13; the first cascade light 12 passes through the B 2 Reflecting mirror B 2 After transmission, the second layer passes through the second layer 3 Reflecting mirror B 3 After reflection, becomes the fourth-order coupled light G 3 Fourth order coupling G 3 Through M 3 Reflector M 3 (ii) C 3 Reflecting mirror C 3 Incident MgO LiNbO after reflection 3 A crystal 13; by analogy, the first cascade light 12 passes through the B n-1 Reflecting mirror B n-1 After transmission, the second layer passes through the second layer n Reflecting mirror B n After reflection, the light becomes the n +1 cascade light G n The n + 1th cascade light G n Through M n Reflector M n C, C n Reflecting mirror C n Incident MgO LiNbO after reflection 3 Crystal 13, n +1 cascade light G n Not the second cascade light G 1 Or third cascade light G 2 ；
Second cascade light G 1 Third cascade light G 2 \8230 ` 8230 `, the n + 1th cascade light G n Incident MgO LiNbO 3 Crystal 13, liNbO, to which MgO is added 3 The crystal 13 generates terahertz waves 14.
Because the frequency difference of the cascade light of adjacent orders in the first cascade light 12 is equal to the frequency difference between the first pump light 2 and the second pump light 4, the first cascade light 12 with different frequency differences of the cascade light of adjacent orders can be generated by adjusting the frequency difference between the first pump light 2 and the second pump light 4.
The plane of beam propagation is a plane determined by an X axis and a Y axis, a Z axis is perpendicular to the plane of beam propagation, the initial propagation direction of a first pump light 2 emitted from a first pump source 1 is an X-axis forward direction, the initial propagation direction of a second pump light 4 emitted from a second pump source 3 is a Y-axis forward direction, and the propagation direction of a mixed light 10 is the X-axis forward direction.
The purpose of one pump light passing through the phase delay system is to synchronize the phases of the two pump lights.
Second cascade light G 1 Third cascade light G 2 \8230, (8230) n +1 cascade light source MgO LiNbO 3 The crystal 13 is incident at an oblique plane in the X-Y plane. Propagation direction of terahertz wave 14 and LiNbO as MgO 3 The vertical angle of the exit face of the crystal 13 is 0-10 deg.
In this embodiment, the first pump source 1 employs a Yb: YAG pulse laser, the frequency of the first pump light 2 is 291.76THz, the second pump source 3 employs a Yb: YAG pulse laser, and the frequency of the second pump light 4 is 291.26THz. The repetition frequency of the two pumping sources is 10Hz, the single pulse energy is 100mJ, the beam diameter is 1mm, and the polarization direction is the Z axis.
In this embodiment, the phase delay system is composed of a first reflector 5, a second reflector 6, a third reflector 7, and a fourth reflector 8, and the second pump light 4 emitted from the second pump source 3 enters the beam combiner 9 after passing through the phase delay system composed of the first reflector 5, the second reflector 6, the third reflector 7, and the fourth reflector 8. The pump light passes through the phase delay system without changing the propagation direction of the light, and the pump light can pass through more than one phase delay system.
The first reflector 5, the second reflector 6, the third reflector 7 and the fourth reflector 8 are plane mirrors, and are used for totally reflecting the second pump light 4, and the B < th > reflection 1 Reflecting mirror B 1 The second one, B 2 Reflecting mirror B 2 823080, 823030a n Reflecting mirror B n The transmittance for the first cascade light 12 is 50%, mth 1 Mirror M 1 M th 2 Reflector M 2 823060 n Mirror M n C, C 1 Reflecting mirror C 1 (ii) C 2 Reflecting mirror C 2 823060 n Reflecting mirror C n Totally reflecting the first cascade light 12.
In this embodiment, the APPLN crystal 11 is a rectangular parallelepiped, rectangular in the X-Y plane, with the optical axis of the crystal along the Z axis. The size X Y Z of the APPLN crystal 11 is 60mm X6 mm X1.5 mm. MgO LiNbO 3 The crystal 13 is isosceles trapezoid in the X-Y plane, the MgO doping concentration is 5 mol%, and the optical axis of the crystal is along the Z axis. MgO LiNbO 3 The crystal 13 has a waist length of 20mm in the X-Y plane, an upper base length of 37.4mm, a lower base length of 20mm, and a thickness of 5mm along the Z axis.
In the present embodiment, the frequency difference between the adjacent cascaded lights in the first cascaded light 12 is equal to 0.5 THz.
In this embodiment, the second cascade light G 1 Third cascade light G 2 \8230 ` 8230 `, the n + 1th cascade light G n Incident MgO LiNbO 3 Direction of crystal 13 and incident MgO LiNbO 3 The included angle of the vertical direction of the crystal 13 surface is 0-10 degrees, and the second cascade light G 1 In cascade with the third stage G 2 Included angle therebetween isθ 1 Third cascade light G 2 With fourth level of collimation G 3 At an included angle ofθ 2 N-th cascade light G n-1 Cascade light G with n +1 n Included angle therebetween isθ n-1 . Change of the C 1 Reflecting mirror C 1 C, C 2 Reflecting mirror C 2 823060; \ 8230c n Reflecting mirror C n Can change the position and the angle ofθ 1 、θ 2 ……θ n-1 The high-power terahertz waves are generated through the non-collinear cascade difference frequency. When changing the wavelength of the cascade light and the corresponding, as shown in fig. 2θ 1 、θ 2 ……θ n-1 Can generate terahertz waves with the frequency of 0.5 THz through the non-collinear cascade difference frequency.
The above-mentioned embodiments are merely examples and illustrations of the technical solutions of the present invention, which are convenient for those skilled in the art to understand the technical solutions of the present application, but not all embodiments, and the scope of the present invention is not limited thereto. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When combinations of technical solutions are mutually inconsistent or cannot be realized, such combinations should not be considered to exist and are not within the scope of the claimed invention. The basic idea of the present invention is to design various modified models, formulas and parameters without any creative effort for those skilled in the art and any skilled in the art without departing from the spirit of the present invention and the general concept of the present invention. Variations, modifications, substitutions, equivalents and changes of the embodiments may be made without departing from the principle and spirit of the invention, which should also be construed as the scope of the invention.
Claims (8)
1. Non-collinear cascade opticsThe difference frequency multi-frequency terahertz wave generation device is characterized in that: comprises a first pump source (1) and a second pump source (3), an APPLN crystal (11), mgO: liNbO 3 Crystal (13), item B 1 Reflecting mirror (B) 1 ) The second one, B 2 Reflecting mirror (B) 2 ) 823080, 823030a n Reflecting mirror (B) n ) M th 1 Reflecting mirror (M) 1 ) M th 2 Reflecting mirror (M) 2 ) 823060, 823030M n Reflecting mirror (M) n ) C, C 1 Reflecting mirror (C) 1 ) (ii) C 2 Reflecting mirror (C) 2 ) 823060 n Reflecting mirror (C) n ) A beam combining mirror (9) and a phase delay system;
a first pump light (2) emitted from a first pump source (1) enters a beam combining mirror (9); second pump light (4) emitted from the second pump source (3) enters the beam combiner (9) after passing through the phase delay system; the first pump light (2) and the second pump light (4) passing through the phase delay system are combined into a mixed light beam (10) in a beam combining mirror (9); mixed light (10) is incident on an APPLN crystal (11) and first cascade light (12) is generated through a cascade optical difference frequency effect; the first cascade light (12) passes through the second cascade light 1 Reflecting mirror (B) 1 ) Becomes second cascade light (G) after transmission 1 ) Second cascade light (G) 1 ) Through M 1 Reflecting mirror (M) 1 ) C, C 1 Reflecting mirror (C) 1 ) Incident MgO LiNbO after reflection 3 A crystal (13); the first cascade light (12) passes through the second cascade light 1 Reflecting mirror (B) 1 ) After reflection, the light passes through the second lens 2 Reflecting mirror (B) 2 ) After reflection, the light becomes third cascade light (G) 2 ) Third cascade (G) 2 ) Through M 2 Reflecting mirror (M) 2 ) (ii) C 2 Reflecting mirror (C) 2 ) Incident MgO LiNbO after reflection 3 A crystal (13); the first cascade light (12) passes through the second cascade light 2 Reflecting mirror (B) 2 ) After transmission, the second layer passes through the second layer 3 Reflecting mirror (B) 3 ) After reflection, becomes the fourth-order coupled light (G) 3 ) Fourth order of luminescence (G) 3 ) Through M 3 Reflecting mirror (M) 3 ) (ii) C 3 Reflecting mirror (C) 3 ) Incident MgO LiNbO after reflection 3 A crystal (13);
by analogy, the first cascade light (12) passes through the B-th n-1 Reflecting mirror (B) n-1 ) After transmission, the second layer passes through the second layer n Reflecting mirror (B) n ) After reflection, the light becomes the n +1 cascade light (G) n ) The n + 1th cascade light (G) n ) Through M n Reflecting mirror (M) n ) (ii) C n Reflecting mirror (C) n ) Incident MgO LiNbO after reflection 3 Crystal (13), n +1 cascade light (G) n ) Not second cascade light (G) 1 ) Or third cascade (G) 2 ）；
Second cascade light (G) 1 ) And third cascade light (G) 2 ) \8230A \8230an +1 cascade light (G) n ) Incident MgO LiNbO 3 Crystal (13) so as to pass MgO LiNbO 3 The crystal (13) generates terahertz waves (14);
the frequencies of the first pump light (2) and the second pump light (4) are different; the plane of light beam propagation is a plane determined by an X axis and a Y axis, a Z axis is vertical to the plane of light beam propagation, the initial propagation direction of first pump light (2) emitted from a first pump source (1) is an X-axis forward direction, the initial propagation direction of second pump light (4) emitted from a second pump source (3) is a Y-axis forward direction, and the propagation direction of mixed light (10) is the X-axis forward direction; propagation direction of terahertz wave (14) and LiNbO 3 The vertical included angle of the emergent surface of the crystal (13) is 0-10 degrees.
2. The multi-frequency terahertz wave generating apparatus based on the non-collinear cascade optical difference frequency according to claim 1, wherein: the first pump source (1) adopts a pulse laser, the second pump source (3) adopts a pulse laser, and the polarization directions of the two beams of pump light are Z-axis.
3. The multi-frequency terahertz wave generating device based on the non-collinear cascade optical difference frequency according to claim 1, wherein: the phase delay system is composed of a first reflector (5), a second reflector (6), a third reflector (7) and a fourth reflector (8), and second pump light (4) emitted from a second pump source (3) enters the beam combiner (9) after passing through the phase delay system composed of the first reflector (5), the second reflector (6), the third reflector (7) and the fourth reflector (8).
4. The multi-frequency terahertz wave generating apparatus based on the non-collinear cascade optical difference frequency according to claim 3, wherein: the first reflector (5), the second reflector (6), the third reflector (7) and the fourth reflector (8) are plane mirrors and are used for totally reflecting the second pump light (4), and the B < th > is 1 Reflecting mirror (B) 1 ) The second one, B 2 Reflecting mirror (B) 2 ) 823080, 823030a n Reflecting mirror (B) n ) Partially transmitting the first cascade light (12), mth 1 Reflecting mirror (M) 1 ) M, M 2 Reflecting mirror (M) 2 ) 823060 n Reflecting mirror (M) n ) C, C 1 Reflecting mirror (C) 1 ) C, C 2 Reflecting mirror (C) 2 ) 823060 n Reflecting mirror (C) n ) Totally reflecting the first cascade light (12).
5. The multi-frequency terahertz wave generating device based on the non-collinear cascade optical difference frequency according to claim 1, wherein: the APPLN crystal (11) is a cuboid which is rectangular in an X-Y plane, and the optical axis is along the Z axis; mgO LiNbO 3 The crystal (13) is in an isosceles trapezoid shape in an X-Y plane, and the optical axis of the crystal is along the Z axis.
6. The multi-frequency terahertz wave generating apparatus based on the non-collinear cascade optical difference frequency according to claim 5, wherein: mgO LiNbO 3 The crystal (13) is isosceles trapezoid in the X-Y plane and has a second cascade (G) 1 ) And third cascade light (G) 2 ) \8230A \8230an +1 cascade light (G) n ) Incident from the plane where the oblique sides of the isosceles trapezoid are located.
7. The multi-frequency terahertz wave generating device based on the non-collinear cascade optical difference frequency according to claim 1, wherein: said first cascade light (12) is a mixed light of a cascade light mixture of frequencies and they propagate co-linearly; the frequency difference of the adjacent cascade light in the first cascade light (12) is equal to the frequency difference between the first pump light (2) and the second pump light (4).
8. The multi-frequency terahertz wave generating apparatus based on the non-collinear cascade optical difference frequency according to claim 1, wherein: second cascade light (G) 1 ) And third cascade light (G) 2 ) 823060 \ 8230a, the n + 1th cascade light (G) n ) Incident MgO LiNbO 3 Direction of crystal (13) and incident MgO LiNbO 3 The included angle of the vertical direction of the crystal (13) surface is 0-10 DEG, and the second cascade light (G) 1 ) In cascade with a third stage (G) 2 ) Included angle therebetween isθ 1 Third cascade (G) 2 ) With fourth order light (G) 3 ) At an included angle ofθ 2 N cascade light (G) n-1 ) Cascade light (G) with n +1 n ) At an included angle ofθ n-1 (ii) a Change of the C 1 Reflecting mirror (C) 1 ) C, C 2 Reflecting mirror (C) 2 ) 823060 n Reflecting mirror (C) n ) Can change the position and angle ofθ 1 、θ 2 ……θ n-1 The high-power terahertz waves are generated through the non-collinear cascade difference frequency.
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