On-chip terahertz double-frequency comb device with RF injection modulation

Abstract

The invention relates to an on-chip terahertz double-frequency comb device with RF injection modulation. The on-chip terahertz double-frequency comb device with RF injection modulation comprises a terahertz quantum cascade laser and T-shaped offset devices; the terahertz quantum cascade laser has two laser resonant cavities in the same water plane; each laser resonant cavity comprises an upper electrode and a gain medium; the two laser resonant cavities share one lower electrode, but work independently; the upper electrodes of the two laser resonant cavities are connected with positive electrodes of different RF sources and DC sources at the same time respectively through different T-shaped offset devices; the lower electrode of the two laser resonant cavities is connected with the negative electrodes of respective DC sources; an annular device is arranged between one T-shaped offset device and one RF resource; the annular device is connected with the spectrum analyzer through the low-noise amplifier; and the two laser resonant cavities are at a distance of 500-5000 microns. The on-chip terahertz double-frequency comb device with RF injection modulation can output optical modes stably, expand an output spectrum range and realize a terahertz waveband double-frequency comb spectrum.

Description

technical field [0001] The invention relates to the technical field of application of semiconductor optoelectronic devices, in particular to an on-chip terahertz dual-frequency comb device for radio frequency injection modulation. Background technique [0002] A frequency comb is a broadband coherent light source composed of a series of equally spaced and highly stable pulses. The frequency comb using dual-frequency comb technology combines high precision and wide spectral coverage, and has great application potential in fast high-resolution spectroscopy . Unlike the traditional Fourier Transform Infrared (FTIR) spectrometer, the dual-frequency comb heterodyne spectroscopy system can achieve fast and high-resolution spectroscopy without moving any components due to its compact system structure. In the Terahertz (THz) band, substances such as toxic gases, biological samples, and drugs have typical "fingerprints", and the development of a dual-frequency comb spectroscopy devi...

AI Technical Summary

Problems solved by technology

However, due to the four-wave mixing effect, the output spectrum range of the terahertz quantum cascade laser is limited, and it cannot be directly used as a terahertz dual-frequency comb light source.

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