Abstract: An ultrahigh-resolution mid-infrared (MIR) dual-comb spectroscopy (DCS) measurement device includes a pump unit, a microring resonator (MRR) unit, a modulation unit, a splitting unit, a testing unit, a signal detection unit, a power balance unit, a reference detection unit and a spectral analysis unit. The measurement method includes: adjusting the laser emitted by the pump unit to the MRR unit; adjusting the modulation unit and performing dual-frequency modulation; generating two sets of MIR optical frequency combs (OFCs) with different repetition rates and splitting the MIR OFCs into the test light and the reference light; performing photoelectric conversion on the test light and injecting the test light to the spectral analysis unit; performing photoelectric conversion on the reference light and injecting the reference light to the spectral analysis unit; and performing Fourier transformation and data processing on test results to obtain absorption spectrum of the to-be-tested sample.

Abstract: An ultrahigh-resolution mid-infrared (MIR) dual-comb spectroscopy (DCS) measurement device includes a pump unit, a microring resonator (MRR) unit, a modulation unit, a splitting unit, a testing unit, a signal detection unit, a power balance unit, a reference detection unit and a spectral analysis unit. The measurement method includes: adjusting the laser emitted by the pump unit to the MRR unit; adjusting the modulation unit and performing dual-frequency modulation; generating two sets of MIR optical frequency combs (OFCs) with different repetition rates and splitting the MIR OFCs into the test light and the reference light; performing photoelectric conversion on the test light and injecting the test light to the spectral analysis unit; performing photoelectric conversion on the reference light and injecting the reference light to the spectral analysis unit; and performing Fourier transformation and data processing on test results to obtain absorption spectrum of the to-be-tested sample.

Abstract: A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals.

Abstract: The present application relates to a mid-infrared (MIR) optical frequency comb (OFC) generation system and method based on manipulation of the multi-photon absorption (MPA) effect, which can break through the repetition-rate limitation for traditional systems and restricted bandwidth as well as high dependence on high-performance pump sources for microcavity-based frequency combs. The system includes a pump light source unit for providing a pump laser, a microring resonator (MRR) unit for broadband comb generation through nonlinear four-wave-mixing process, and an MPA effect control unit for realizing the MIR soliton-state OFC by controlling the loaded voltage or current on the MRR unit. The proposed system and operation method have advantages of being simple in structure, economic for use, and easy to implement for broadband low-noise frequency comb generation.

Abstract: A high-resolution real-time time-frequency domain measuring device includes a light splitting unit used to split signal light to be measured, a time lens unit used to perform time domain amplification on the signal light to be measured, a dispersion Fourier transform unit used to perform Fourier transform on the signal light to be measured, and a detection unit used to receive and detect measured data. The time lens and the dispersion Fourier transform technology are used to realize the real-time measurement of sub-picosecond transient characteristics of the ultra-short pulse to accurately obtain the time-frequency domain information of the ultra-short pulse.

Abstract: A system for generating a mid-infrared optical frequency comb based on a lithium niobate microcavity includes pumping units, a beam combining unit, a nonlinear frequency conversion unit and a filtering unit. The pumping units are divided into two paths and are configured to provide two paths of pumping light. The beam combining unit is configured to perform beam combination on the two paths of pumping light The nonlinear frequency conversion unit is configured to receive the beam-combined pumping light and undergo a nonlinear four-wave mixing process to generate a broadband optical frequency comb at a mid-infrared waveband. The filtering unit is configured to filter the remaining pumping light and output a mid-infrared optical frequency comb.

Abstract: A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals.

Abstract: The present disclosure belongs to the field of optical measurement, and relates to a high-resolution real-time time-frequency domain measuring device and method for an ultra-short pulse. The technical problem of how to realize high-resolution real-time measurement of time-frequency domain information of the ultra-short pulse and improve the accuracy and reliability of a measurement result is solved. The measuring device includes a light splitting unit used to split signal light to be measured, a time lens unit used to perform time domain amplification on the signal light to be measured, a dispersion Fourier transform unit used to perform Fourier transform on the signal light to be measured, and a detection unit used to receive and detect measured data.