A breakthrough in frequency combing technology is expected to improve spectral resolution

The research team of the terahertz solid state technology laboratory of the Shanghai Institute of Microsystems and Information Technology, Chinese Academy of Sciences, Cao Juncheng and Li Hua, based on the efficient continuous wave, electrically pumped terahertz quantum cascade laser (THz QCL) source, overcomes the THz laser. Narrow-band bottleneck, for the first time in the world to achieve a homogeneous, wide-spectrum THz QCL frequency comb (Frequency comb), the frequency continuous coverage reaches 330GHz.

This indicator is the world record for the THz QCL from the bound state to the continuous state transition. Based on the homogeneous, wide-spectrum THz QCL frequency comb, THz spectral analysis was successfully implemented. Homogeneous spectral spanning of terahertz semiconductor lasers with radio frequency modulation was published in the March 8th issue of Science Report (WJ Wan, H. Li, T. Zhou, and JC Cao, Sci. Rep. 7, 44109 ( 2017)).

Since the Nobel Prize in Physics has been awarded for the research work on frequency combing in 2005, frequency comb research in various bands has gradually become a hot topic. The frequency comb consists of a series of spectrally stable, equally spaced lines. Since the frequency stability of the frequency comb is very high (on the order of Hz-kHz), it can be analogized to a ruler for use in absolute frequency measurement, high-precision spectral analysis, or as an ultra-stable frequency reference for other light. In the THz band, the development of THz frequency comb has certain difficulties due to the lack of effective radiation sources. Among many THz radiation sources, the electrically pumped THz QCL technology is the most effective and practical solution for achieving THz frequency combing. Based on the currently implemented homogeneous, wide-spectrum THz QCL frequency comb, the research group is developing a dual THz QCL frequency comb synthesis technique. Compared with the current commercial THz spectrometer, the frequency comb spectroscopy technology is expected to increase the spectral resolution by 3-4 orders of magnitude in the future, which has obvious industrialization prospects.

The work was funded by the “Hundred Talents Program” of the Chinese Academy of Sciences, the special scientific equipment development project of the Ministry of Science and Technology, the National Natural Science Foundation, and the Shanghai Science and Technology Commission International Science and Technology Cooperation Fund.

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