CN211528873U - Device for generating terahertz waves by collinear circular polarization long-wave bicolor field - Google Patents
Device for generating terahertz waves by collinear circular polarization long-wave bicolor field Download PDFInfo
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- CN211528873U CN211528873U CN201922101546.7U CN201922101546U CN211528873U CN 211528873 U CN211528873 U CN 211528873U CN 201922101546 U CN201922101546 U CN 201922101546U CN 211528873 U CN211528873 U CN 211528873U
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Abstract
The utility model discloses a device of terahertz wave is produced to collineation circular polarization long wave double-colored field, include: the long wavelength femtosecond laser system is used for providing linearly polarized ultrashort pulse transmission to the frequency doubling unit; the frequency doubling unit is used for frequency doubling and converting part of the incident ultrashort pulses into second harmonic waves and transmitting the ultrashort pulses and the second harmonic waves to the polarization adjusting unit; the polarization adjusting unit is used for adjusting the linear polarization ultrashort pulse and the second harmonic into a circular polarization ultrashort pulse and a circular polarization second harmonic, and transmitting the circular polarization ultrashort pulse and the circular polarization second harmonic to the phase delay unit; the phase delay unit is used for adjusting the phase difference between the circularly polarized ultrashort pulse and the circularly polarized second harmonic wave so as to realize focusing to generate plasma and radiate terahertz waves. The device disclosed by the utility model is simple in structure, can accurately obtain circular polarization double-colored field effectively, and then improve and produce terahertz pulse intensity and efficiency.
Description
Technical Field
The utility model relates to a terahertz optics technical field especially relates to a device that collineation circular polarization long wave double-colored field produced terahertz wave.
Background
The terahertz wave frequency band is located at 0.1-10 THz (unit: terahertz), has the advantages of low photon energy (single photon energy is only m eV magnitude), high penetrability (for nonmetal and nonpolar materials), strong absorbability (for polar materials and biological macromolecules) and the like, and can be widely applied to the fields of medical imaging, security inspection, optical communication and the like. In order to apply terahertz waves to various fields better, a strong terahertz radiation source is indispensable.
The generation method of the terahertz pulse comprises a photoconductive antenna method based on a photoconductive antenna, an optical rectification effect and an optical difference frequency effect based on a nonlinear crystal, and an air plasma method based on air ionization. However, when the terahertz pulse is generated by using the photoconductive antenna and the nonlinear crystal, the intensity of the generated terahertz wave is limited by the damage threshold of the generating material, so that strong terahertz radiation is difficult to generate; and the air plasma method is utilized, the limitation of a damage threshold value is not needed to be considered, and strong terahertz radiation can be effectively generated by increasing the intensity of the pumping pulse.
At present, the double-color field circular polarization pumping method is the most effective strong terahertz pulse generation method in the current air plasma method, and the conversion efficiency is more than 5 times of that of the double-color field linear polarization pumping method. In the prior art, the dual-color field circular polarization pumping method mainly utilizes a Mach-Zehnder optical fiber interferometer structure to realize the beam splitting and beam combining of an 800nm dual-color field, so that the relative phase of the dual-color field is very easily influenced by factors such as ambient temperature, vibration and the like. To reduce this effect, another continuous laser beam was introduced and feedback controlled using a piezoelectric transducer. This feedback design may improve the stability of the system to some extent, but the structure becomes more complex and the improvement is less effective at low pulse repetition rates or single-shot applications. In addition, the 800nm light field has significant dispersion with its harmonic fields, which is not conducive to accurate circular polarization control for the dichromatic field.
Disclosure of Invention
The utility model provides a device of collineation circular polarization long wave double-colored field generation terahertz wave can solve among the prior art system architecture and become comparatively complicated and because the chromatic dispersion leads to the inaccurate technical problem of circular polarization control.
The utility model discloses the first aspect provides a device that collineation circular polarization long wave double-colored field produced terahertz wave, include: the device comprises a long wavelength femtosecond laser system, a frequency doubling unit, a polarization adjusting unit and a phase delay unit;
the long wavelength femtosecond laser system is used for providing linearly polarized ultrashort pulses and transmitting the ultrashort pulses to the frequency doubling unit;
the frequency doubling unit is used for performing frequency doubling conversion on a part of the incident ultrashort pulses to obtain linearly polarized second harmonics, and transmitting the second harmonics and the other part of the remaining ultrashort pulses to the polarization adjusting unit;
the polarization adjusting unit is used for adjusting the incident linearly polarized ultrashort pulse and the incident second harmonic into a circularly polarized ultrashort pulse and a circularly polarized second harmonic, and transmitting the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit;
the phase delay unit is used for adjusting the phase difference between the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic wave, so that the emergent circularly polarized ultrashort pulse and the circularly polarized second harmonic wave are focused to generate plasma which radiates terahertz waves.
Optionally, the long wavelength femtosecond laser system is a laser system with a wavelength greater than 1500nm, and the wavelength of the ultrashort pulse is greater than 1500 nm.
Optionally, the apparatus further comprises: a focusing unit;
the focusing unit is used for focusing the ultrashort pulse emitted by the long wavelength femtosecond laser system and transmitting the focused ultrashort pulse to the frequency doubling unit.
Optionally, the frequency doubling unit converts the incident ultrashort pulse part into a second harmonic.
Optionally, the polarization adjustment unit includes: the fundamental wave broadband half-wave plate, the second harmonic broadband 1/4 wave plate and the fundamental wave broadband 1/4 wave plate;
the fundamental wave broadband half-wave plate is used for receiving the incident linearly polarized ultrashort pulse and the second harmonic wave, adjusting the linear polarization direction of the ultrashort pulse to 45 degrees, enabling the linear polarization direction of the ultrashort pulse and the second harmonic wave to form 45 degrees, and transmitting the ultrashort pulse and the second harmonic wave to the second harmonic wave broadband 1/4 wave plate;
the second harmonic broadband 1/4 wave plate is used for receiving the incident ultrashort pulse and the second harmonic, performing circular polarization processing on the second harmonic, maintaining the polarization direction of the ultrashort pulse, and transmitting the processed circular polarization second harmonic and the ultrashort pulse to the fundamental broadband 1/4 wave plate;
the fundamental wave broadband 1/4 wave plate is used for circularly polarizing the linearly polarized ultrashort pulse and reversing the rotation direction of the circularly polarized second harmonic wave, so as to transmit the obtained circularly polarized ultrashort pulse and the circularly polarized second harmonic wave to the phase delay unit.
Optionally, the phase delay unit includes a first wedge and a second wedge, and the manufacturing materials and wedge angles between the first wedge and the second wedge are the same and are placed in parallel relatively;
the second wedge is used for matching with the first wedge to adjust the phase of the circularly polarized ultrashort pulse and the circularly polarized second harmonic, and transmits the focusable circularly polarized two-color field pump light, so that the circularly polarized two-color field pump light is focused to generate plasma, and the terahertz wave is radiated.
The utility model provides a pair of device of terahertz wave is produced to collineation circular polarization long wave bicolor field includes at least: the device comprises a long wavelength femtosecond laser system, a frequency doubling unit, a polarization adjusting unit and a phase delay unit; the long wavelength femtosecond laser system is used for providing linearly polarized ultrashort pulses and transmitting the ultrashort pulses to the frequency doubling unit; the frequency doubling unit is used for performing frequency doubling conversion on a part of the incident ultrashort pulses to obtain linearly polarized second harmonics, and transmitting the second harmonics and the other part of the remaining ultrashort pulses to the polarization adjusting unit; the polarization adjusting unit is used for adjusting the incident linearly polarized ultrashort pulse and the incident second harmonic into a circularly polarized ultrashort pulse and a circularly polarized second harmonic, and transmitting the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit; the phase delay unit is used for adjusting the phase difference between the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic wave, so that the emergent circularly polarized ultrashort pulse and the circularly polarized second harmonic wave are focused to generate plasma which radiates terahertz waves. The device can reduce the complexity of the system structure by relatively arranging the long wavelength femtosecond laser system, the frequency doubling unit, the polarization adjusting unit and the phase delay unit and matching between the components, and reduce the influence of dispersion on circular polarization control by the pulse with specific wavelength, thereby improving the accuracy of circular polarization control, and the collinearity of the transmission light path between the components can improve the intensity and the phase stability of the generated terahertz pulse.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of an apparatus for generating terahertz waves by using a collinear circularly polarized long wave two-color field according to the present invention;
fig. 2 is the structure diagram of the device for generating terahertz waves by using the collinear circular polarization long wave bicolor field provided by the utility model.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The technical problems that the system structure becomes more complex in the prior art and the circular polarization control is inaccurate due to chromatic dispersion are solved.
In order to solve the above technical problem, the utility model provides a device for generating terahertz waves by using a collinear circular polarization long wave bicolor field, please refer to fig. 1 and fig. 2, fig. 1 is a block diagram of the device for generating terahertz waves by using a collinear circular polarization long wave bicolor field provided by the utility model, and fig. 2 is a structure diagram of the device for generating terahertz waves by using a collinear circular polarization long wave bicolor field provided by the utility model;
the device includes: a long wavelength femtosecond laser system 101, a frequency doubling unit 103, a polarization adjustment unit 104, and a phase delay unit 105;
the long wavelength femtosecond laser system 101 is used for providing linearly polarized ultrashort pulses and transmitting the ultrashort pulses to the frequency doubling unit 103;
the frequency doubling unit 103 is configured to perform frequency doubling conversion on a part of the incident ultrashort pulses to obtain a linearly polarized second harmonic, and transmit the second harmonic and the remaining other part of the ultrashort pulses to the polarization adjusting unit 104;
the polarization adjusting unit 104 is configured to adjust the incident linearly polarized ultrashort pulse and the second harmonic into a circularly polarized ultrashort pulse and a circularly polarized second harmonic, and transmit the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit 105;
the phase delay unit 105 is configured to adjust a phase difference between the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic, so that the emergent circularly polarized ultrashort pulse and the circularly polarized second harmonic are focused to generate a plasma that radiates terahertz waves.
In the embodiment of the utility model, a device for generating a collinear circular polarization long wave two-color field and a corresponding internal structure are mainly protected, and the device is mainly used for pumping a gas medium to generate terahertz waves (terahertz field); the internal structure of the device comprises some lens type units, such as a focusing unit 102, a frequency doubling unit 103, a polarization adjusting unit 104, a phase delay unit 105, and at least one laser system for providing a laser light source, preferably, the long wavelength femtosecond laser system 101 is selected for use in the embodiments of the present invention, and specifically, the internal structure of the device is arranged such that one surface of the focusing unit 102 is disposed opposite to the long wavelength femtosecond laser system 101, the polarization adjusting unit 104 is disposed opposite to the other surface of the focusing unit 102, and the phase delay unit 105 is disposed opposite to the polarization adjusting unit 104, so that the system transmission optical paths in the internal structure are in a collinear state (i.e., in the same transmission optical path state), and ultra-short pulses (ultra-short pulses are fundamental waves) of output linear polarization of the long wavelength femtosecond laser system 101 are transmitted to the focusing unit 102 for focusing treatment, the ultrashort pulse is focused and can be transmitted to the frequency doubling unit 103, the frequency doubling unit 103 is mainly used for performing 2-fold frequency conversion on part of the ultrashort pulse to obtain a linearly polarized second harmonic, and transmitting the linearly polarized ultrashort pulse and the second harmonic to the polarization adjusting unit 104, the polarization adjusting unit 104 is mainly used for performing circular polarization processing on the linearly polarized ultrashort pulse and the second harmonic respectively to obtain a circularly polarized ultrashort pulse and a circularly polarized second harmonic, and transmitting the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit 105, the phase delay unit 105 is mainly used for obtaining a phase difference between the circularly polarized ultrashort pulse and the second harmonic to output circularly polarized dichromatic field pump light from the phase delay unit 105, the source polarized dichromatic field pump light is focused to generate plasma, and the plasma refers to a gaseous substance formed by positive and negative ions, air is broken down through ultrashort pulse focusing, so that a large number of positive and negative ions are ionized, and plasma is obtained and can radiate terahertz waves.
The utility model provides a pair of device of terahertz wave is produced in double-colored field of collineation circular polarization long wave, through set up focusing unit 102 in the device's inner structure, frequency doubling unit 103, polarization adjustment unit 104 and phase delay unit 105, make the device that produces terahertz wave have the structure of simplification, and the collineation through inner structure's transmission light path realizes improving the stability of double-colored field relative phase place, and then the reinforcing produces terahertz pulse intensity and phase stability now, and the dispersion of birefringent crystal ultrashort pulse (fundamental wave) and secondary harmonic is little, be favorable to double-colored field to carry out accurate circular polarization control.
Further, the long wavelength femtosecond laser system 101 is an optical parametric amplification laser system with a wavelength greater than 1500nm, and the wavelength of the ultrashort pulse is greater than 1500 nm. In the implementation of the utility model, the laser system in the device is a long-wave-field femtosecond laser system, the system is a 1500nm optical parameter amplification laser system, the wavelength of the output ultrashort pulse is 1500nm, and the conversion efficiency of the terahertz wave is high; it should be noted that the long wavelength of the laser system of the present invention is > 1500nm, and the longer the wavelength, the higher the conversion efficiency in converting into terahertz waves.
Further, the apparatus further comprises: a focusing unit 102;
the focusing unit 102 is configured to focus the ultrashort pulse emitted by the long wavelength femtosecond laser system 101, and transmit the focused ultrashort pulse to the frequency doubling unit 103.
In the embodiment of the present invention, after the long wavelength femtosecond laser system 101 of the apparatus outputs the ultrashort pulse (fundamental wave), the transmission optical path of the ultrashort pulse (fundamental wave) is comparatively dispersed, in order to ensure or enable the ultrashort pulse to realize the collineation, the ultrashort pulse needs to be transmitted to the focusing unit 102, and the ultrashort pulse is focused by the focusing unit 102, so that the ultrashort pulse can be transmitted to the frequency doubling unit 103 according to the preset optical path transmission path.
Further, the frequency doubling unit 103 performs frequency doubling processing on the incident part of the ultra-short pulse.
In the embodiment of the present invention, the frequency doubling unit 103 is a class I frequency doubling crystal, and can select a class I β -BBO crystal with a thickness of 0.2mm, and the optical axis and the fundamental wave thereof are at 0 ° or 90 ° for generating a second harmonic, and the polarization direction of the generated second harmonic and the fundamental wave thereof are at 90 °, and the frequency doubling crystal is a nonlinear crystal capable of realizing frequency doubling effect, and can realize frequency conversion for incident ultrashort pulse, and can generate a new pulse with twice frequency of the incident ultrashort pulse; the I type is I type phase matching, the frequency doubling effect of the crystal for realizing the I type phase matching requires that the polarization directions of incident fundamental waves are the same, and the polarization direction of generated second harmonic is vertical to the polarization direction of the ultrashort pulse; specifically, after receiving the incident ultrashort pulse, the frequency doubling unit 103 performs 2 times frequency conversion on a part of the ultrashort pulse to obtain a second harmonic with a wavelength of 780nm, where the second harmonic and the ultrashort pulse are necessary conditions for forming a dual color field together, and are transmitted to the polarization adjustment unit 104 together with the ultrashort pulse.
Further, the polarization adjustment unit 104 includes: a fundamental broadband half-wave plate 1041, a second harmonic broadband 1/4 wave plate 1042 and a fundamental broadband 1/4 wave plate 1043;
the fundamental wave broadband half-wave plate 1041 is configured to receive the incident linearly polarized ultrashort pulse and the second harmonic, and adjust the linear polarization direction of the ultrashort pulse by 45 °, so that the linear polarization direction of the ultrashort pulse and the second harmonic forms 45 °, and transmit the 45 ° to the second harmonic broadband 1/4 wave plate 1042; the utility model discloses an in the implementation, this fundamental wave broadband half waveplate 1041, optional 1560nm broadband zero order half waveplate, be equivalent to full wave plate to 780 nm's second harmonic, its fast axis or slow axis direction are 22.5 contained angles with ultrashort pulse (fundamental wave) polarization direction, thereby rotate 45 with the linear polarization direction of ultrashort pulse, and keep the polarization direction of second harmonic unchangeable, thereby make the linear polarization direction of fundamental wave and second harmonic become 45, and transmit ultrashort pulse and second harmonic to second harmonic broadband 1/4 wave plate 1042.
The second harmonic broadband 1/4 wave plate 1042 is used for receiving the incident ultrashort pulse and second harmonic, performing circular polarization processing on the second harmonic, maintaining the polarization direction of the ultrashort pulse, and transmitting the processed circular polarization second harmonic and ultrashort pulse to the fundamental broadband 1/4 wave plate 1043; in this embodiment, the second harmonic broadband 1/4 wave plate 1042 can be a 780nm broadband zero-order 1/4 wave plate, in which the fast axis or slow axis direction thereof forms an angle of 45 ° with the polarization direction of the second harmonic wave and forms an angle of 0 ° or 90 ° with the polarization direction of the ultrashort pulse, so as to change the linearly polarized second harmonic wave into circular polarization without changing the polarization direction of the linearly polarized ultrashort pulse, and transmit the processed circularly polarized second harmonic wave and ultrashort pulse to the fundamental broadband 1/4 wave plate 1043.
The fundamental broadband 1/4 wave plate is used for circularly polarizing the linearly polarized ultrashort pulse and reversing the rotation direction of the circularly polarized second harmonic wave, so as to transmit the obtained circularly polarized ultrashort pulse and circularly polarized second harmonic wave to the phase delay unit 105; in this embodiment, the fundamental broadband 1/4 wave plate 1043 may be a 1560nm broadband zero-order 1/4 wave plate, and is equivalent to a half-wave plate for the second harmonic of 780nm, and the fast axis or slow axis direction thereof forms an angle of 45 ° with the polarization direction of the ultrashort pulse, so that the linearly polarized ultrashort pulse is changed into circular polarization, and the rotation direction of the circularly polarized second harmonic is reversed, so as to obtain collinear circularly polarized dichromatic field pump light, and transmit the circularly polarized dichromatic field pump light to the phase delay unit 105.
Further, the phase delay unit 105 includes a first wedge 1051 and a second wedge 1052, the first wedge 1051 and the second wedge 1052 are made of the same material, and the wedge angle of the first wedge is the same as the wedge angle of the second wedge, and the first wedge and the second wedge are disposed in parallel;
the first wedge 1051 is configured to receive the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic, and transmit the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the second wedge 1052;
the second wedge 1052 is used for matching with the first wedge 1051 to perform phase adjustment on the circularly polarized ultrashort pulse and the circularly polarized second harmonic, and transmits the focusable circularly polarized dual-color field pump light, so that the circularly polarized dual-color field pump light is focused to generate plasma, and terahertz waves are radiated.
In the implementation of the present invention, the phase delay unit 105 comprises two wedge plates made of optical glass, i.e. the first wedge 1051 and the second wedge 1052, and the first wedge 1051 and the second wedge 1052 can be made of quartz glass; the sizes of the first wedge 1051 and the second wedge 1052 are different, and the phase difference between the ultrashort pulse and the second harmonic wave can be controlled by adjusting the distance between the first wedge 1051 and the second wedge 1052, that is, the phase difference of the collinear circularly polarized dual-color-field pump light is adjusted, so that the collinear circularly polarized dual-color-field pump light can generate plasma after focusing, and terahertz waves are radiated.
The utility model provides a pair of device of terahertz wave is produced to collineation circular polarization long wave bicolor field includes at least: the device comprises a long wavelength femtosecond laser system, a frequency doubling unit, a polarization adjusting unit and a phase delay unit; the long wavelength femtosecond laser system is used for providing linearly polarized ultrashort pulses and transmitting the ultrashort pulses to the frequency doubling unit; the frequency doubling unit is used for performing frequency doubling conversion on a part of incident ultrashort pulses to obtain linearly polarized second harmonic, and transmitting the second harmonic and the rest of ultrashort pulses to the polarization adjusting unit; the polarization adjusting unit is used for adjusting the incident linearly polarized ultrashort pulse and the incident second harmonic into a circularly polarized ultrashort pulse and a circularly polarized second harmonic and transmitting the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit; the phase delay unit is used for adjusting the phase difference between the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic wave, so that the emergent circularly polarized ultrashort pulse and the circularly polarized second harmonic wave are focused to generate plasma which radiates terahertz waves. The device can reduce the complexity of the system structure by relatively arranging the long wavelength femtosecond laser system, the frequency doubling unit, the polarization adjusting unit and the phase delay unit and matching between the components, and reduce the influence of dispersion on circular polarization control by the pulse with specific wavelength, thereby improving the accuracy of circular polarization control, and the collinearity of the transmission light path between the components can improve the intensity and the phase stability of the generated terahertz pulse.
In the several embodiments provided in the present invention, it should be understood that the present apparatus and method can be implemented in other ways, and the application of the present invention is not limited to the above examples. To those skilled in the art, the idea of the embodiment of the invention may be changed in the specific implementation and application scope, and in summary, the content of the present description should not be construed as limiting the invention.
Claims (6)
1. An apparatus for generating terahertz waves in a collinear circularly polarized long wave two-color field, the apparatus comprising: the device comprises a long wavelength femtosecond laser system, a frequency doubling unit, a polarization adjusting unit and a phase delay unit;
the long wavelength femtosecond laser system is used for providing linearly polarized ultrashort pulses and transmitting the ultrashort pulses to the frequency doubling unit;
the frequency doubling unit is used for performing frequency doubling conversion on a part of the incident ultrashort pulses to obtain linearly polarized second harmonics, and transmitting the second harmonics and the other part of the remaining ultrashort pulses to the polarization adjusting unit;
the polarization adjusting unit is used for adjusting the incident linearly polarized ultrashort pulse and the incident second harmonic into a circularly polarized ultrashort pulse and a circularly polarized second harmonic, and transmitting the circularly polarized ultrashort pulse and the circularly polarized second harmonic to the phase delay unit;
the phase delay unit is used for adjusting the phase difference between the incident circularly polarized ultrashort pulse and the circularly polarized second harmonic wave, so that the emergent circularly polarized ultrashort pulse and the circularly polarized second harmonic wave are focused to generate plasma which radiates terahertz waves.
2. The apparatus for generating terahertz waves in accordance with claim 1, wherein the long wavelength femtosecond laser system is a laser system with a wavelength greater than 1500nm and the ultrashort pulse has a wavelength greater than 1500 nm.
3. The apparatus for generating terahertz waves in accordance with claim 1, wherein said apparatus further comprises: a focusing unit;
the focusing unit is used for focusing the ultrashort pulse emitted by the long wavelength femtosecond laser system and transmitting the focused ultrashort pulse to the frequency doubling unit.
4. The apparatus for generating terahertz waves in accordance with claim 1, wherein said frequency doubling unit converts said portion of the incident ultrashort pulses into second harmonics.
5. The apparatus for generating terahertz waves in accordance with claim 1, wherein the polarization adjustment unit comprises: the fundamental wave broadband half-wave plate, the second harmonic broadband 1/4 wave plate and the fundamental wave broadband 1/4 wave plate;
the fundamental wave broadband half-wave plate is used for receiving the incident linearly polarized ultrashort pulse and the second harmonic wave, adjusting the linear polarization direction of the ultrashort pulse to 45 degrees, enabling the linear polarization direction of the ultrashort pulse and the second harmonic wave to form 45 degrees, and transmitting the ultrashort pulse and the second harmonic wave to the second harmonic wave broadband 1/4 wave plate;
the second harmonic broadband 1/4 wave plate is used for receiving the incident ultrashort pulse and the second harmonic, performing circular polarization processing on the second harmonic, maintaining the polarization direction of the ultrashort pulse, and transmitting the processed circular polarization second harmonic and the ultrashort pulse to the fundamental broadband 1/4 wave plate;
the fundamental wave broadband 1/4 wave plate is used for circularly polarizing the linearly polarized ultrashort pulse and reversing the rotation direction of the circularly polarized second harmonic wave, so as to transmit the obtained circularly polarized ultrashort pulse and the circularly polarized second harmonic wave to the phase delay unit.
6. The device for generating terahertz waves by using the collinear circular polarization long-wave bichromal field as claimed in claim 2, wherein the phase delay unit comprises a first wedge and a second wedge, and the wedge angle and the material between the first wedge and the second wedge are the same and are arranged in parallel;
the second wedge is used for matching with the first wedge to adjust the phase of the circularly polarized ultrashort pulse and the circularly polarized second harmonic, and projects focusable circularly polarized two-color field pump light, so that the circularly polarized two-color field pump light is focused to generate plasma, and the terahertz wave is radiated.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111045272A (en) * | 2019-11-29 | 2020-04-21 | 深圳大学 | Device and method for generating terahertz waves by collinear circular polarization long-wave bicolor field |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111045272A (en) * | 2019-11-29 | 2020-04-21 | 深圳大学 | Device and method for generating terahertz waves by collinear circular polarization long-wave bicolor field |
| CN111045272B (en) * | 2019-11-29 | 2023-12-01 | 深圳大学 | Device and method for generating terahertz waves through collinear circularly polarized long-wave double-color field |
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