Active terahertz optical comb tooth width modulation method

A modulation method, terahertz technology, applied in the field of optics, can solve problems such as high environmental requirements and poor modulation stability of terahertz comb teeth, and achieve the effects of high modulation accuracy, large adjustable range, and strong operability

Inactive Publication Date: 2017-02-22
UNIV OF SHANGHAI FOR SCI & TECH
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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

Method used

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  • Active terahertz optical comb tooth width modulation method
  • Active terahertz optical comb tooth width modulation method

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Embodiment Construction

[0015] Such as figure 1 The schematic diagram of the principle of actively modulating the tooth width of a terahertz optical comb is shown. The dotted line in the figure indicates the electrical signal, the solid line indicates the optical signal, and the arrow indicates the direction of signal transmission.

[0016] figure 1 It includes a laser diode 101; an electric pulse generator 102; an intensity modulator 103; a positive dispersion fiber 104; a power amplifier 105; a pulse width compression device 106;

[0017] In the 102 electrical pulse generating device, the signal source is used to output an electrical signal that changes periodically at frequency f, and the electrical signal is applied to the step recovery diode. With the periodic change of the input signal, the time domain interval of the output on the load is T=1 / f, the pulse width is the electrical pulse signal of the step recovery diode step time t (ps level). The time domain interval of the electrical pulse s...

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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,...

Claims

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Application Information

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IPC IPC(8): G02F1/35
CPCG02F1/35G02F2203/56
Inventor 李敏夏宇段思邈叶蓬勃曾和平
Owner UNIV OF SHANGHAI FOR SCI & TECH
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