Method for continuously regulating central frequency and spectrum width of THz (terahertz) wave

A spectrum width and frequency technology, applied in the field of continuously adjusting the center frequency and spectrum width of terahertz waves, can solve problems such as difficulty in adjusting frequency and spectrum width, single center frequency terahertz waves, etc., and achieve the effect of easy operation and simple installation

Active Publication Date: 2013-01-16
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0009] The present invention is aimed at the problem that most current terahertz pulse generation techniques can only generate terahertz waves with a single center frequency and a certain spectrum width, and it is difficult to adjust the frequency and spectrum width, and proposes a method for continuou

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  • Method for continuously regulating central frequency and spectrum width of THz (terahertz) wave
  • Method for continuously regulating central frequency and spectrum width of THz (terahertz) wave
  • Method for continuously regulating central frequency and spectrum width of THz (terahertz) wave

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Embodiment Construction

[0019] like figure 1 Shown is a schematic diagram of the structure of the device for continuously adjusting the center frequency and spectral width of terahertz waves, consisting of laser 1, birefringent crystal wedge pair 2, zero-order 1 / 4 wave plate 3, polarizer 4, focusing lens 5, frequency doubling The crystal 6 and the terahertz detection system 7 are composed. A birefringent crystal oblique wedge pair 2 is placed at the exit of the laser 1, and the initial laser pulse is divided into two linearly polarized laser beams with mutually perpendicular polarizations and a certain time delay. Since the optical axis of the birefringent crystal wedge pair 2 forms an included angle of 45° with the polarization direction of the initial laser pulse, the two divided linearly polarized lasers have equal intensities. Two linearly polarized laser beams pass through a zero-order 1 / 4 wave plate 3 in turn to form a left-handed and a right-handed polarized light, which are combined into a s...

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Abstract

The invention relates to a method for continuously regulating central frequency and spectrum width of THz (terahertz) wave. A bundle of ultrafast laser pulse passes through a movable birefringence crystal oblique split pair and a zero-order quarter wave plate to generate a novel specially-polarized light field by a polarizing gate method. The novel light field passes through a polarizer to obtain laser pulse with width of narrow pulse with linear polarization. Laser pulses different in width are obtained by controlling inserting quantity of the birefringence crystal oblique split pair, and accordingly the function of regulating central frequency and spectrum width of the THz wave is achieved. A device is simple and easy to operate, the width of the novel laser pulse can be changed only two crystals of the birefringence crystal oblique split pair simultaneously move oppositely at equal distance, and accordingly the central frequency and the spectrum width are adjusted. The method is suitable for light sources of various pulse widths and wavelengths.

Description

technical field [0001] The invention relates to an electromagnetic wave adjustment technology, in particular to a method for continuously adjusting the center frequency and spectrum width of a terahertz wave. Background technique [0002] In recent decades, terahertz waves have become an important research topic in the field of physics internationally due to their wide application prospects. Terahertz radiation is an electromagnetic wave with a frequency in the range of 0.1 to 10 THz. This band is located between microwave and infrared. It has the characteristics of rich information, high space-time coherence, and low photon energy. The field of science has enormous application value. At present, the main applied researches are terahertz time-domain spectroscopy, terahertz imaging technology, security inspection, terahertz radar, astronomy, and communication technology. [0003] At present, the generation of broadband terahertz pulses mainly includes three methods: photoco...

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Application Information

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IPC IPC(8): G02F1/35G02F1/37
Inventor 彭滟朱亦鸣周云燕方丹洪淼张益彬蔡斌陈麟庄松林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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