Adaptive double optical comb spectral compensation signal extraction method

Abstract

The invention discloses an adaptive double optical comb spectral compensation signal extraction method. The adaptive double optical comb spectral compensation signal extraction method is characterized in that Michelson interferometers and electricity beat frequency acquire adaptive double optical comb spectral compensation signals; the time domain time-delay and frequency domain selection mode is used; the Michelson interferometers are effectively used to detect the pre pulse and after pulse of certain time-delay, and extract the signals representing the self repetition rate jitter and carrier envelope phase jitter of single pulse laser; and at last, through the electricity frequency multiplication and frequency mixing process, the compensation signals representing the corresponding repetition rate jitter and the corresponding carrier envelope phase jitter of the two pulse lasers can be obtained, and the compensation signals can be directly used for adaptive double optical comb spectral measurement. Compared with the prior art, the adaptive double optical comb spectral compensation signal extraction method completely avoid the mode that two narrow line-width continuous lasers are required to introduce in the adaptive double optical comb spectrum to extract compensation signals, so that the compensation signals are slightly interfered by the continuous optical wavelength drifting and is stable and reliable, and the stability and reliability of the adaptive double optical comb spectral system can be further improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to an adaptive dual-comb spectral compensation signal extraction method based on Michelson interferometer. Background technique [0002] As a frontier topic in the field of scientific research in recent years, dual-comb spectroscopy technology can greatly improve the accuracy of spectral detection. Compared with the traditional technology, the dual optical comb spectral detection technology has two improvements. One is to use an optical comb to replace the traditional light source. As a standard, the position of the frequency spectral line is more stable, the line width is narrower, and the accuracy is higher; Optical combs with slightly different frequencies are measured at the same time. One is used as a reference comb and the other is used as an excitation comb, which is similar to the main scale and auxiliary scale of a vernier caliper. Through frequency misalign...

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Problems solved by technology

[0003] In the current adaptive dual-comb spectroscopy system, the source of the compensation signal comes from the mutual optical beat frequency of two narrow linewidth continuous lasers and two ultrashort pulse lasers. Due to environmental temperature and vibration changes, each narrow linewidth laser or The optical frequency of an ultrashort pulse laser will drift randomly with time. Therefore, the center frequency of the optical beat signal will also drift randomly with time, and the drift range is very large, which can easily exceed the bandwidth of the circuit filter, resulting in the loss of the beat signal. The circuit processing module fails, and the adaptive compensation system works abnormally

In order to control the drift range of optical beat frequency signals of narrow-linewidth CW lasers and ultrashort pulse lasers, a negative feedback loop can be established, and parameters such as the temperature of the CW laser, the pump power, or the repetition frequency of the pulsed laser can be adjusted to combine the two The beat frequency drift is controlled within the bandwidth of the follow-up circuit filter, but this negative feedback compensation method will inevitably cause interference to the adaptive optical comb spectrum and reduce the measurement accuracy of the system

[0004] In the adaptive dual-comb spectroscopy system of the prior art, the compensation signal extraction method must first use a narrow linewidth continuous laser and an ultrashort pulse laser to optically beat the frequency, and there is a major hidden danger of the loss of the beat frequency signal, which affects the stability of the long-term operation of the system ,reliability

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