A Method of Continuously Adjustable Center Frequency of Terahertz Wave by Pulsed Laser Broadening

Abstract

The invention relates to a method for achieving terahertz wave center frequency continuous adjustability through pulse laser widening. Initial pulse lasers are divided into base frequency light and frequency multiplication light. Time domain widening is carried out on the base frequency light by adopting a pulse widening method to obtain the base frequency light after the time domain widening. After the frequency multiplication light passes through a reflective mirror and a light beam time delay system, space beam combination is carried out on the frequency multiplication light and the base frequency light after the time domain widening, light of different wavelengths in the frequency light and the base frequency light interacts to generate terahertz waves of different frequencies, and the terahertz waves are received by a terahertz wave detection system. The relative time coincident point between the two pulses generated by the base frequency light and the frequency multiplication light can be adjusted freely through the light beam time delay system. In the practical operating process, the relative time coincident point between the two pulses can be changed simply by controlling the light beam time delay system in a frequency multiplication light path, and thus the central frequency of the terahertz waves can be adjusted. The method is suitable for ultrashort pulse lasers of various wavelengths.

Description

technical field [0001] The invention relates to an electromagnetic wave adjustment technology, in particular to a method for continuously adjusting the central frequency of a terahertz wave. Background technique [0002] Terahertz waves refer to electromagnetic waves with frequencies in the range of 0.1-10 THz (1THz=10 12 Hz), located between microwave and infrared radiation in the electromagnetic spectrum, is the transition region between electronics and photonics, macroscopic and microscopic. Before the mid-1980s, little was known about electromagnetic waves in this frequency band, forming the so-called "terahertz gap" between microwave and infrared radiation. Because terahertz waves have great scientific research value and broad application prospects in basic research fields such as physics, chemistry, astronomy, life science, and medical science, as well as in applied research fields such as safety inspection, medical imaging, environmental monitoring, and food inspect...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that most current terahertz pulse generation techniques can only generate terahertz waves with a single center frequency, and proposes a method for continuously adjusting the center frequency of terahertz waves through pulse laser stretching, which can realize continuous adjustment of terahertz waves. Function of Hertzian center frequency

Images