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A terahertz wave phase control system based on linear bias position
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A control system and hertzian wave technology, applied in the field of terahertz wave phase control, can solve the problems of high cost and complex manufacturing process of modulators, and achieve the effects of low cost, continuously adjustable energy, and simple manufacturing process
Active Publication Date: 2022-03-18
CHONGQING UNIV OF POSTS & TELECOMM
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[0005] In order to solve the existing terahertz wave phase control schemes using modulation devices, such as phase regulators based on metasurface units, twisted nematic liquid crystal terahertz phase modulators, etc., the manufacturing process of the modulators is complicated and the cost is extremely high. , the present invention provides a terahertz wave phase control system based on the linear bias position to solve the above problems
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Embodiment 1
[0042] Such as figure 1As shown, this embodiment provides a terahertz wave phase control system based on the linear bias position, including: a laser generating device 1, a pulse width and energy adjusting device 2, a detection laser circuit 3, and a pumping laser with a line high voltage device Road 4 and terahertz detector 5;
[0043] The laser generating device 1 emits incident laser pulses, which are divided into two laser beams after pulse width and energy adjustment device 2 performs pulse adjustment and energy adjustment:
[0044] A beam of detection laser light reaches the terahertz detector 5 after being time-delayed and focused by the detection laser circuit 3;
[0045] A beam of pumping laser light enters the pump laser circuit 4 with a line high voltage device to form a plasma channel, and the pump laser circuit 4 with a line high voltage device applies electric fields to different positions of the plasma channel, and the plasma channel radiates terahertz waves A...
Embodiment 2
[0064] Perform terahertz wave phase regulation based on the previous embodiment:
[0065] First, the pulse width of the pump laser is changed through the grating pair, and the pulse bandwidth of the pump laser is measured by an autocorrelator to reach about 40 fs;
[0066] The output energy of the pump laser is changed by a 1 / 2 wave plate and two reflectors incident at the Brewster angle, and the output energy of the pump laser is measured to be about 5mJ with an energy card meter. At this time, the polarization state of the pump pulse is y-polarized, that is, along the vertical direction. The direction in which the line high voltage is loaded in the plasma channel is the vertical direction, which is the same as the polarization state of the pump laser.
[0067] Under the condition of a monochromatic laser pulse and a uniform electric field on the plasma channel, by adjusting the delay between the pump pulse and the detection pulse, and optimizing the spatial coincidence betw...
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Abstract
The invention discloses a terahertz wave phase control system based on the position of the linear bias voltage. The laser generating device sends out incident laser pulses, and the incident laser pulses are divided into two beams of lasers after undergoing pulse width and energy adjustment by a pulse width and energy adjustment device: one One beam as the probe laser passes through the time delay of the probe laser path and is focused to reach the terahertz detector; one beam as the pump laser enters the pump laser path with a line high voltage device and forms a plasma channel, and the pump laser path with a line high voltage device The electric field is applied to different positions of the plasma channel, and the terahertz wave radiated by the plasma channel reaches the terahertz detector after being focused; the electric field is applied to different positions of the plasma channel through a line high-voltage device, thereby adjusting the phase of the terahertz wave, and the production process Simple and low cost, the regulation is performed at the radiation source of the terahertz wave, the phase regulation of the terahertz wave is precise, and the regulation effect is good.
Description
technical field [0001] The invention relates to the technical field of terahertz wave phase regulation, in particular to a terahertz wave phase regulation system based on a line bias position. Background technique [0002] Terahertz waves (THz) are electromagnetic waves with a frequency range of 0.1-10 THz that bridge the microwave and infrared regions of the electromagnetic spectrum; they have attracted increasing attention over the past 20 years. [0003] In recent years, with the development of femtosecond laser technology and effective spectral characterization techniques (such as terahertz time-domain spectroscopy), terahertz wave technology has shown great advantages in sensing, imaging, spectroscopy, security inspection and communication. Application prospects. However, terahertz wave technology requires not only terahertz sources and terahertz detectors, but also the regulation of parameters such as the transmission and phase of terahertz waves. [0004] Most of th...
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