Active terahertz optical comb tooth width modulation method

Abstract

The invention relates to an active terahertz optical comb tooth width modulation method. The method comprises the steps of outputting an electrical signal with a periodic change at a frequency f by means of a signal source to act on a step recovery diode, and outputting an electric pulse signal with the time domain interval being T= 1 / f and the pulse width being in a picosecond order of the step time of the step recovery diode on the load; modulating an intensity modulator with the electric pulse signal, and outputting a laser pulse signal with the time domain interval same as that of the electric pulse signal and the pulse width similar to that of the electric pulse signal; then conducting pulse broadening, power amplification and pulse width compression on the laser pulse signal to obtain an ultra-short impulse sequence with the femtosecond pulse width and the evenly spaced time domain, taking the ultra-short impulse sequence as a repetition frequency accurate locking femtosecond laser light source to act on a terahertz generation device, and obtaining a repetition frequency accurate locking terahertz optical comb. According to the method, active adjustment of the terahertz comb tooth width is achieved through adjustment of an electrooptic modulator. The modulation accuracy of the terahertz comb tooth is high and the adjustable range is wide.

Description

technical field [0001] The invention relates to an optical technology, in particular to an active terahertz optical comb tooth width modulation method. Background technique [0002] Terahertz (THz) spectroscopy has been widely used in biomolecular detection, material structure measurement, physical property analysis and identification, and characterization of semiconductor and high-temperature superconducting materials. It can also develop new methods for detecting complex organic molecules in the environment, etc. . The optical frequency comb has a series of spectral lines neatly distributed in its frequency domain. These spectral lines are equally spaced and numerous in number, providing precise "reticules" for spectral analysis. Therefore, the research on terahertz optical combs provides the basis for obtaining high terahertz spectral resolution, and provides technical support for improving the accuracy of terahertz spectral resolution. [0003] In the frequency domain,...

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Problems solved by technology

[0004] The present invention aims at the problems of poor stability and high environmental requirements in current terahertz comb modulation, and proposes an active terahertz optical comb comb width modulation method. Active adjustment of width

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