Coherent terahertz super-continuum spectrum frequency modulation device based on hollow optical fiber tube

Abstract

The invention relates to a coherent terahertz super-continuum spectrum frequency modulation device based on a hollow optical fiber tube. Ultra-short pulse laser output by a laser light source is divided into two beams by a beam splitting piece, transmitting light beams pass through a focusing lens, an inlet window piece of the hollow optical fiber tube and frequency doubling crystal, enter and are focused in the hollow optical fiber tube filled with gas, laser drawn wires are generated nearby the focus of a lens, the laser drawn wires react with the gas in the optical fiber tube to generate terahertz radiation, the terahertz radiation is emergent through high-resistance silicon at the other port of the hollow optical fiber tube, passes through ITO and then enters a terahertz spectrum detection system, and a gas inlet and outlet and pressure intensity detecting device is arranged on the outer wall of the hollow optical fiber tube; the other part of beam reflected by the beam splitting piece passes through a first reflecting mirror, a delay module, a second reflecting mirror and the ITO and then enters the terahertz spectrum detection system as terahertz probe light. Frequency modulation can be carried out on coherent terahertz just by changing gas pressure in the hollow optical fiber tube, and the device is simple, practical and convenient to operate.

Description

technical field [0001] The invention relates to a terahertz frequency modulation technology, in particular to a coherent terahertz supercontinuum frequency modulation device based on a hollow fiber tube. Background technique [0002] In recent decades, terahertz waves have become an important research topic in the field of physics in the world due to its wide application prospects. Terahertz waves refer to electromagnetic waves (1THz=10 12 Hz), which lies between microwaves and infrared radiation on the electromagnetic spectrum. The special electromagnetic spectrum position of terahertz waves makes it have many unique advantages, such as rich information, high spatiotemporal coherence, and low photon energy. It has great application value in astronomy, biology, computer, communication and other scientific fields. At present, the main applied research includes terahertz time-domain spectroscopy technology, terahertz imaging technology, security inspection, terahertz radar,...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the relatively difficult problems of the center frequency and spectrum width of terahertz waves at present, and proposes a coherent terahertz supercontinuum frequency modulation device based on hollow fiber tubes. A beam of ultrafast pulsed laser is focused by a frequency doubling crystal into a hollow fiber tube filled with gas, and the two-color laser ionizes the gas in the focused area to generate plasma, thereby radiating terahertz pulses

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