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Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method

A technology of periodically polarized crystal and frequency comb, applied in the field of nonlinear optical frequency conversion, can solve the problems of narrow free spectral range, limitation, limited spectral range, etc., to achieve wide spectral range and free spectral range, reduce absorption, relax desired effect

Active Publication Date: 2012-04-18
TIANJIN UNIV
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Problems solved by technology

However, the frequency comb produced by this method has a limited spectral range and a narrow free spectral range, which is limited in many fields of application

Method used

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  • Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method
  • Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method
  • Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method

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Embodiment Construction

[0021] Optically rectified surface radiation in periodically poled crystals using ultrashort pulses can also generate THz output with a comb-like spectrum. This approach relaxes the requirements on the frequency comb pumping source, eliminating the need for complex optical frequency comb pumping. The generated THz frequency comb has a wide spectrum range and comb tooth spacing (free spectrum range), and has good applications in the fields of THz wavelength division multiplexing communication and the like.

[0022] The terahertz frequency comb is generated based on periodically polarized crystal optical rectification, which consists of a laser, a periodically polarized crystal and a receiving and detecting system. The laser is a Ti:Sapphire mode-locked fs laser; the periodically polarized crystal is 5mol% MgO:LiNbO 3 crystal; a beam splitter and a glass convex lens are arranged between the laser and the periodically polarized crystal; the receiving detection system includes a ...

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Abstract

The invention relates to nonlinear optical frequency conversion, and belongs to the interdisciplinary field of the terahertz radiation source technology and the optical frequency comb technology. For providing a terahertz frequency comb device based on optical rectification in a periodically poled crystal and a modulation method, and achieving an effect that the wide spectrum output is implemented in a range of 0.2-3.5 THz, a free spectrum range can reach 0.5 THz, and the device can run stably at room temperature, the invention adopts a technical scheme as follows: the terahertz frequency comb device based on the optical rectification in a periodically poled crystal is composed of a laser device, a periodically poled crystal and a receiving / detecting system, and a beam splitter and a glass convex lens are configured between the laser device and the periodically poled crystal; a polyethylene lens is arranged between the periodically poled crystal and a detector; generated THz waves areoutputted perpendicular to the side face of the crystal, and collected by the polyethylene lens; and the receiving / detecting system comprises a photoconductive antenna detector, a computer controllerand a delay line. The device and method provided by invention are mainly applied to nonlinear optical frequency conversion.

Description

technical field [0001] The invention relates to nonlinear optical frequency conversion, and belongs to the intersecting field of terahertz radiation source technology and optical frequency comb technology. In particular, it relates to optical rectification terahertz frequency comb devices and modulation methods based on periodically polarized crystals. Background technique [0002] The spectrum of the frequency comb has the characteristics of multiple wavelengths, narrow linewidth and equal spacing, and can be widely used in frequency metrology, applied spectroscopy, optical atomic clocks, optical arbitrary waveform synthesis, and wavelength division multiplexing in optical communication systems. Frequency comb technology has made great progress in the optical band, and three relatively mature frequency comb radiation sources have been developed. In 2005, John Hall and He was awarded the Nobel Prize in Physics for his achievements in the field of precision metrology based...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03H01S3/10
Inventor 徐德刚王与烨刘鹏翔姚建铨钟凯
Owner TIANJIN UNIV
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