All-fiber transmission reflection integrated terahertz time-domain spectroscopy system

A terahertz time-domain and spectral system technology, which is applied in the field of all-fiber transflective integrated terahertz time-domain spectroscopy system, can solve problems such as complex structure and poor stability, and achieve the effect of simple system and optimized terahertz pulse waveform

Active Publication Date: 2015-04-29
天津理特光电科技有限公司
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Problems solved by technology

[0005] Most of the terahertz time-domain spectroscopy systems currently used i

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Embodiment Construction

[0029] All the features, methods or steps in the process disclosed in the present invention can be combined in any way, except for mutually exclusive features or steps.

[0030] Any feature disclosed in the present invention, unless specifically stated, can be replaced by other equivalent or similar purpose alternative features. That is, unless expressly stated otherwise, each feature is only one example of a series of equivalent or similar features.

[0031] One, the relevant description of the present invention:

[0032] In the embodiment of the present invention, the terahertz transmitter 17 and the terahertz receiver 18 antenna are suitable for femtosecond pulses near the central wavelength of 1560nm, so the laser 1 selected in the present invention is a femtosecond pulsed fiber laser with a central wavelength of 1550nm. Other types of photoconductive antennas or nonlinear crystals and lasers of other wavelengths can be selected.

[0033] The first off-axis parabolic mir...

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Abstract

The invention provides an all-fiber transmission reflection integrated terahertz time-domain spectroscopy system. At present, most of the terahertz time-domain spectroscopy systems refer to free-space systems and have the defects of complex structure, low stability and the like. Aiming at the problem, femtosecond laser pulse is transmitted by virtue of optical fibers, so that the usage amount of optical devices in the light path is reduced, and the light path is simple and stable in structure. Meanwhile, because the femtosecond laser pulse comes into a terahertz emitter and a terahertz receiver by virtue of optical fibers, the light path structure of the system is not influenced by the movement and rotation of the positions of the terahertz emitter and the terahertz receiver, the terahertz receiver and the terahertz emitter can be respectively arranged on two rotatable optical guide rails, and flexible switch between terahertz transmission and reflection time-domain spectroscopy systems can be further realized. Therefore, the problem that the terahertz spectroscopy system is complex in structure and large in size in the prior art is solved.

Description

technical field [0001] The invention relates to an all-fiber transflective integrated terahertz time-domain spectroscopy system, especially capable of realizing terahertz transmission, multi-angle reflection and diffuse reflection spectrum detection. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1THz to 10THz, and a wavelength in the range of about 0.03mm to 3mm, which is between infrared light and microwaves. [0003] The properties of materials can be analyzed by using terahertz pulses, and terahertz time-domain spectroscopy is a very effective testing method. The terahertz time-domain spectroscopy system is a coherent detection technology that can simultaneously obtain the amplitude and phase information of the terahertz pulse. Through the analysis of the time-domain and frequency-domain waveforms, parameters such as the absorption coefficient and refractive index of the sample can be obtained. Terahertz t...

Claims

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Application Information

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IPC IPC(8): G01N21/3586G01J3/42
Inventor 刘伟伟杨晶赵佳宇郭兰军
Owner 天津理特光电科技有限公司
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