High-sensitivity high-resolution-ratio terahertz radiation detector capable of working at room temperature

Abstract

The invention discloses a high-sensitivity high-resolution-ratio terahertz radiation detector capable of working stably at room temperature. The high-sensitivity high-resolution-ratio terahertz radiation detector is characterized in that a near infrared laser device is a laser device with the output wave length located in a near infrared wave band, terahertz detecting signals are signals to be detected, an off-axis parabolic mirror is used for focusing reflection terahertz signals, an upper conversion crystal can guarantee that the terahertz detecting signals and laser near infrared signals satisfy upper conversion conditions in the upper conversion crystal and upper converted near infrared signals can be generated, an optical filter can filter non-converted laser near infrared signals and a near infrared optical detector can be used for detecting near infrared wave band optical signals. The high-sensitivity high-resolution-ratio terahertz radiation detector which works at the room temperature is capable of detecting terahertz impulse signals with low energy and high in detecting sensitivity and resolution ratio, has an ns-level high resolution ratio in the time domain, obviously reduces the limitation in an existing detecting method to a terahertz signal source to be detected, and can realize detecting of terahertz radiation signals with the wide frequency spectrum through the method of adjusting the angle of the upper conversion crystal in a small range.

Description

technical field [0001] The invention relates to a terahertz detection device, in particular to a high-sensitivity and high-resolution terahertz radiation detector capable of stable operation at normal temperature. Background technique [0002] As we all know, the application prospects of terahertz waves are very broad, but a very important factor that limits its application is the detection of terahertz waves. Commercial pyroelectric detectors can be used to detect terahertz signals, but due to its noise The level is relatively high, and the equipment requires relatively high terahertz power or single pulse energy, so the sensitivity is too low for the detection of weak terahertz signals; although the BOLOMETER detector has high sensitivity, because the BOLOMETER detector needs liquid helium Nitrogen cooling, so it is very inconvenient to use; in addition, neither the pyroelectric detector nor the BOLOMETER can detect terahertz pulses of ns magnitude or shorter, and the tim...

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Problems solved by technology

[0002] As we all know, the application prospects of terahertz waves are very broad, but a very important factor that limits its application is the detection of terahertz waves. Commercial pyroelectric detectors can be used to detect terahertz signals, but due to its noise The level is relatively high, and the equipment requires relatively high terahertz power or single pulse energy, so the sensitivity is too low for the detection of weak terahertz signals; although the BOLOMETER detector has high sensitivity, because the BOLOMETER detector needs liquid helium Nitrogen cooling, so it is very inconvenient to use; in addition, neither the pyroelectric detector nor the BOLOMETER can detect terahertz pulses of ns magnitude or shorter, and the time domain resolution cannot meet the actual detection of terahertz signals. need

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