CN110854653A - Broadband terahertz light source based on nonlinear optical rectification process - Google Patents
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- CN110854653A CN110854653A CN201810952304.6A CN201810952304A CN110854653A CN 110854653 A CN110854653 A CN 110854653A CN 201810952304 A CN201810952304 A CN 201810952304A CN 110854653 A CN110854653 A CN 110854653A
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Abstract
The invention discloses a broadband terahertz light source based on a nonlinear optical rectification process, and belongs to the fields of photoelectrons, lasers and nonlinear optics. The invention mainly comprises a femtosecond pulse near-infrared laser light source (1), a beam splitter (2), an optical delay line (3), a polaroid (4), a lens (5), a chopper (6), a nonlinear crystal (7), parabolic reflectors (8, 9, 11 and 12), a filter (10), an electro-optic crystal (13), a quarter-wave plate (14), a Wollaston prism (15) and a balance detector (16). The near infrared femtosecond laser pulse is focused on a nonlinear crystal through a lens, and terahertz (THz) radiation generated by optical rectification in the crystal is collected, collimated and reflected through a parabolic reflector and then focused on an electro-optic crystal. And finally, performing terahertz spectrum detection by using an electro-optical sampling technology. Compared with the prior art, the terahertz radiation conversion device can realize broadband output terahertz radiation, and is simple in system, high in stability and high in terahertz radiation conversion efficiency.
Description
Technical Field
The invention discloses a broadband terahertz light source based on a nonlinear optical rectification process, and belongs to the fields of photoelectrons, lasers and nonlinear optics.
Background
Terahertz (THz) radiation generally refers to electromagnetic radiation in the frequency range of 0.1THz to 10THz, which is located at the interface between electronics and optics. The wavelength of the terahertz wave is between millimeter wave and infrared light, the photon energy is low, and the terahertz wave can be used for nondestructive measurement of a biological sample. Meanwhile, the terahertz wave band contains the rotation energy level of light molecules and the vibration mode of macromolecular active functional groups, and many organic molecules have characteristic absorption peaks in the terahertz wave band, so that the terahertz light source can effectively identify the molecules, and the terahertz light source has wide application in the fields of biomedicine, material analysis, spectral detection and the like. These applications all require terahertz light sources with broad spectral output and high average power.
Currently, there are three main broadband terahertz radiation generation mechanisms based on the femtosecond laser technology: 1) exciting plasmas in air by laser to generate terahertz waves; 2) exciting a semiconductor antenna by laser to generate terahertz waves; 3) terahertz waves are generated by optical rectification or optical difference frequency in the nonlinear crystal. The first method requires high-energy ultrashort pulses focused in air, and the peak laser power needs to be more than 1014W/cm2Therefore, the system is expensive, complicated and difficult to operate. The second method is restricted by the current semiconductor antenna manufacturing process and materials, can only realize the terahertz spectrum output of 0.1THz to 5THz, and cannot completely cover the whole terahertz wave band. Terahertz technology based on optical rectification in nonlinear crystals is therefore considered to be the most dominant method of generating broadband terahertz radiation. Commonly used crystals include GaP, GaSe, GaAs, ZnTe, LiNO3ZGP, and organic crystals DAST, DSTMS, OH 1. According to the working wavelength of the femtosecond laser used as a pumping source and the matching condition of the crystal phase, the proper crystal is selected to obtain the wide spectrum output, and the system is simple and has high stability and extremely high practical value.
Disclosure of Invention
The terahertz radiation source with wide spectral range and high conversion efficiency is realized by utilizing the optical rectification phenomenon of the nonlinear crystal and combining the femtosecond near-infrared laser source. The invention has wide application prospect in the fields of regenerative medicine, material analysis and spectrum detection.
In order to realize the purpose, the following technical scheme is adopted:
the utility model provides a broadband terahertz light source now based on nonlinear optics rectification process which characterized in that: the device mainly comprises one or more of a femtosecond pulse near-infrared laser source (1), a beam splitter (2), an optical delay line (3), a polarizing plate (4), a lens (5), a chopper (6), a nonlinear crystal (7), parabolic reflectors (8, 9, 11 and 12), a filter plate (10), an electro-optic crystal (13), a quarter-wave plate (14), a Wollaston prism (15) and a balance detector (16).
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the space light path is as follows: the femtosecond pulse near-infrared laser light source (1) is divided into two beams of transmission light and reflection light by a beam splitter (2), wherein the reflection light is called probe light, and the transmission light is called pump light; the optical path of the detection light can be adjusted through an optical delay line; the pump light sequentially passes through the polaroid (4), the lens (5) and the chopper (6) to reach the nonlinear crystal (7), and terahertz radiation is generated through an optical rectification process; the divergent terahertz radiation is collected and reflected by parabolic mirrors (8, 9); the filter (10) is used for blocking the residual near-infrared laser; the parabolic reflector (11) is provided with a small hole which is parallel to the collimated light beam and is positioned in the center, the detection light can pass through the small hole, and the terahertz light can be reflected by the parabolic reflector because the area of a light spot is far larger than that of the small hole; the pump light and the terahertz light are focused on the electro-optical crystal (13) through the parabolic reflector (12). A
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the time domain signal of the terahertz radiation is measured by adopting an electro-optical sampling technology, and then the spectral information of the terahertz radiation is obtained through Fourier transform, and the electro-optical sampling measuring device mainly comprises an electro-optical crystal (13), a quarter wave plate (14), a Wollaston prism (15) and a balance detector (16).
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the femtosecond pulse near-infrared laser source (1) is a semiconductor laser, a solid laser, a thin-film laser or a fiber laser, and outputs the central wavelength lambda of the pump light0The range of (A) is as follows: 500nm<λ0<5000nm。
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the beam splitter (2) is a flat plate beam splitter, a cube beam splitter, a film beam splitter dichroic beam splitter or a D-shaped reflector, and the range of the light splitting proportion is as follows: 0.01% to 99%.
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the nonlinear crystal (7) is inorganic crystal GaP, GaSe, GaAs, ZnTe or LiNO3ZGP, or organic crystals DAST, DSTMS, OH 1.
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the parabolic reflectors (8, 9, 11 and 12) are gold-plated parabolic reflectors or silver-plated parabolic reflectors; wherein, parabolic reflector (11) have be on a parallel with collimated light beam and be located the aperture of center, aperture diameter range is: 1 to 10 mm.
The broadband terahertz light source based on the nonlinear optical rectification process is characterized in that: the electro-optical crystal (13) is inorganic crystal GaP, GaSe, GaAs, ZnTe or LiNO3ZGP, or organic crystals DAST, DSTMS, OH 1.
Drawings
Fig. 1 is a schematic structural diagram of a broadband terahertz light source based on a nonlinear optical rectification process according to the present invention.
In the figure: 1. the device comprises a femtosecond pulse near-infrared laser light source, 2, a beam splitter, 3, an optical delay line, 4, a polaroid, 5, a lens, 6, a chopper, 7, a nonlinear crystal, 8, 9, 11 and 12, a parabolic reflector, 10, a filter, 13, an electro-optic crystal, 14, a quarter-wave plate, 15, a Wollaston prism, 16 and a balance detector.
Detailed Description
The invention is further illustrated with reference to FIG. 1, but is not limited to the following examples.
Fig. 1 is a schematic structural diagram of an embodiment of a broadband terahertz light source based on a nonlinear optical rectification process according to the present invention. The femtosecond pulse near-infrared laser source (1) is an ytterbium-doped fiber laser with the central wavelength of 1064nm, the pulse width of 20fs, the repetition frequency of 80MHz and the average power of 10W. A beam splitter with the reflectivity of 10% is adopted to divide incident laser into two beams of transmission and reflection light, wherein the reflection light is called detection light and has the power of 10%; the transmitted light is called pump light and has 90% power. The pump light passes through the polarizer (4), lens (5) and chopper (6) in order to reach the nonlinear crystal GaP (7), which has a thickness of 2 mm. The frequency of the chopper was 3 kHz. The lens is coated with a 1064nm antireflection film, and the focal length is 150 mm. The diameter of the focusing light spot is 10 microns, and terahertz radiation is generated through an optical rectification process. The thickness of the filter (10) is 1 mm, the filter is used for blocking residual near-infrared laser, and the filter can transmit terahertz radiation. The parabolic mirror (11) has a central aperture parallel to the collimated beam of light, the aperture having a diameter of 3 mm through which the probe light can pass. The diameter of the terahertz light spot is 20 mm, so that the terahertz light spot can be reflected by the paraboloid mirror. The pump light and terahertz light with the wavelength of 1063nm are focused on an electro-optical crystal GaP (13) with the thickness of 0.5 mm through a parabolic reflector (12). Electro-optical sampling is carried out on an electric field of terahertz by utilizing electro-optical effect. The balanced detector output is made zero by rotating the quarter wave plate (14) so that the detector is in the linear region. And measuring a time domain signal of the terahertz radiation through a Wollaston prism (15) and a balance detector (16). And finally, obtaining the spectral information of the terahertz radiation through Fourier transform, wherein the spectral range covers 0.1THz to 10 THz.
Claims (8)
1. The utility model provides a broadband terahertz light source now based on nonlinear optics rectification process which characterized in that: the device mainly comprises one or more of a femtosecond pulse near-infrared laser source (1), a beam splitter (2), an optical delay line (3), a polarizing plate (4), a lens (5), a chopper (6), a nonlinear crystal (7), parabolic reflectors (8, 9, 11 and 12), a filter plate (10), an electro-optic crystal (13), a quarter-wave plate (14), a Wollaston prism (15) and a balance detector (16).
2. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the femtosecond pulse near-infrared laser light source (1) is divided into two beams of transmission light and reflection light by a beam splitter (2), wherein the reflection light is called probe light, and the transmission light is called pump light; the optical path of the detection light can be adjusted through an optical delay line; the pump light sequentially passes through the polaroid (4), the lens (5) and the chopper (6) to reach the nonlinear crystal (7), and terahertz radiation is generated through an optical rectification process; the divergent terahertz radiation is collected and reflected by parabolic mirrors (8, 9); the filter (10) is used for blocking the residual near-infrared laser; the parabolic reflector (11) is provided with a small hole which is parallel to the collimated light beam and is positioned in the center, the detection light can pass through the small hole, and the terahertz light can be reflected by the parabolic reflector because the area of a light spot is far larger than that of the small hole; the pump light and the terahertz light are focused on the electro-optical crystal (13) through the parabolic reflector (12).
3. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the time domain signal of the terahertz radiation is measured by adopting an electro-optical sampling technology, and then the spectral information of the terahertz radiation is obtained through Fourier transform, and the electro-optical sampling measuring device mainly comprises an electro-optical crystal (13), a quarter wave plate (14), a Wollaston prism (15) and a balance detector (16).
4. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the femtosecond pulse near-infrared laser source (1) is a semiconductor laser, a solid laser, a thin-film laser or a fiber laser, and outputs the central wavelength lambda of the pump light0The range of (A) is as follows: 500nm<λ0<5000nm。
5. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the beam splitter (2) is a flat plate beam splitter, a cube beam splitter, a film beam splitter dichroic beam splitter or a D-shaped reflector, and the range of the light splitting proportion is as follows: 0.01% to 99%.
6. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the nonlinear crystal (7) is inorganic crystal GaP, GaSe, GaAs, ZnTe or LiNO3ZGP, or organic crystals DAST, DSTMS, OH 1.
7. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the parabolic reflectors (8, 9, 11 and 12) are gold-plated parabolic reflectors or silver-plated parabolic reflectors; wherein, parabolic reflector (11) have be on a parallel with collimated light beam and be located the aperture of center, aperture diameter range is: 1 to 10 mm.
8. The broadband terahertz light source based on the nonlinear optical rectification process as claimed in claim 1, wherein: the electro-optical crystal (13) is inorganic crystal GaP, GaSe, GaAs, ZnTe or LiNO3ZGP, or organic crystals DAST, DSTMS, OH 1.
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Cited By (2)
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| CN113629477A (en) * | 2021-07-13 | 2021-11-09 | 南京邮电大学 | Adjustable terahertz radiation source based on femtosecond laser induced liquid crystal |
| CN115000785A (en) * | 2022-05-16 | 2022-09-02 | 中国人民解放军军事科学院国防科技创新研究院 | Terahertz radiation regulation and control device and method based on laser pulse width modulation |
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| CN113629477A (en) * | 2021-07-13 | 2021-11-09 | 南京邮电大学 | Adjustable terahertz radiation source based on femtosecond laser induced liquid crystal |
| CN115000785A (en) * | 2022-05-16 | 2022-09-02 | 中国人民解放军军事科学院国防科技创新研究院 | Terahertz radiation regulation and control device and method based on laser pulse width modulation |
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