Transmission-type terahertz spectral analysis method independent of reference light

A spectral analysis, transmission technology, applied in the field of transmission terahertz spectrum analysis, can solve the problems that are not suitable for long-distance transmission

Inactive Publication Date: 2011-04-06
CAPITAL NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, traditional spectral analysis methods are not suitable for long-distance transmission and large-scale focal plane imaging

Method used

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  • Transmission-type terahertz spectral analysis method independent of reference light
  • Transmission-type terahertz spectral analysis method independent of reference light
  • Transmission-type terahertz spectral analysis method independent of reference light

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Embodiment Construction

[0021] In order to better understand the shape, structure and characteristics of the present invention, preferred embodiments will be listed below and described in detail with reference to the accompanying drawings.

[0022] The transmissive terahertz spectral analysis system of the present invention does not depend on reference light such as figure 1 As shown, the laser light source used is a Ti:Sapphire femtosecond laser manufactured by American Spectrum Physics Corporation. The laser power of this laser is 0.90W, the pulse width is 100fs, the repetition frequency is 82MHz, and the center of gravity wavelength is 800nm.

[0023] The femtosecond laser light generated by the laser is divided into two beams by the beam splitter 2: the transmitted beam is stronger as the pumping beam I, and the reflected beam is used as the probe beam II. A half-wave plate 1 is arranged between the laser and the polarization beam splitter 2 to adjust the light intensity ratio of the pump light I...

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Abstract

The invention discloses a transmission-type terahertz spectral analysis method independent of reference light, which comprises the following steps of: (1) performing transmission-type spectral measurement on a tested sample to obtain a terahertz time domain wave form of the tested sample; (2) obtaining a phase spectrum of the tested sample in a system effective frequency range according to the measured terahertz time domain wave form; and (3) extracting a characteristic absorption spectrum of the tested sample in a terahertz wave range from the phase spectrum.

Description

technical field [0001] The present invention relates to a transmission type terahertz spectrum analysis method, in particular, the invention relates to a method of directly analyzing the signal of the measured sample under the condition of not relying on reference light after the transmission type terahertz spectrum measurement is performed on a weakly polar organic compound material. The phase spectrum is analyzed and processed to obtain the characteristic absorption spectrum of the measured material in the terahertz band. It overcomes the disadvantage that traditional spectral analysis relying on reference light is not suitable for large-scale and long-distance terahertz imaging. Background technique [0002] The properties of materials can be analyzed by using the spectrum of pulsed terahertz waves, among which terahertz time-domain spectroscopy (THz-TDS) is a very effective testing method. Terahertz time-domain spectroscopy technology is a coherent detection technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 张亮亮钟华邓朝张存林
Owner CAPITAL NORMAL UNIVERSITY
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