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Noise compensation method for two-optical-comb measuring system

A measurement system and noise compensation technology, applied in interferometric spectroscopy, spectrum investigation, etc., can solve the problems of high cost, complex system, limited application of high-precision dual-optical comb system, etc., to achieve simplified structure, high compensation accuracy, and satisfactory accuracy Effect

Active Publication Date: 2018-10-02
TSINGHUA UNIV
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Problems solved by technology

Both existing methods can achieve the sub-Hz linewidth and available phase information of the sub-frequency comb longitudinal mode, but rely on the complex and expensive ultra-stable continuous laser and high-speed feedback-locked optoelectronic components, which limits the high-precision dual Further Applications of Optical Comb Systems

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  • Noise compensation method for two-optical-comb measuring system
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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the drawings. However, it should be understood that the drawings are only provided for a better understanding of the present invention, and they should not be construed as limiting the present invention.

[0028] The noise compensation method of the dual optical comb measurement system provided by the present invention includes the following contents:

[0029] 1. Use two adjacent longitudinal modes of a narrow linewidth continuous laser with a wavelength difference of ~10nm (~ means approximately) and a linewidth of ~10kHz on the same side as the two optical combs (the adjacent longitudinal mode refers to the frequency domain, The longitudinal mode closest to the continuous laser frequency spectrum) generates a beat signal (beat frequency refers to the difference between the two frequencies), and then obtains the relative beat signal f between the longitudinal modes of the two optical combs b1 And f ...

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Abstract

The invention relates to a noise compensation method for a two-optical-comb measuring system. The method comprises: two continuous laser devices and two optical combs generate beat frequency signals at adjacent longitudinal models at the same side to obtain relative beat frequency signals fb1 and fb2 between two optical comb longitudinal modes; the relative beat frequency signals fb1 and fb2 are processed to obtain a carrier phase noise of an interference signal and time jittering of a periodic envelope in a two-optical-comb measuring system; and according to the carrier phase noise of the interference signal and time jittering of the periodic envelope in the two-optical-comb measuring system, noises of an original interference signal in the two-optical-comb measuring system are correctedto realize noise compensation. The compensation precision is high; the precision needed by the two-optical-comb measuring system application is met; the dependence on the high-precision light source is reduced substantially; and the system cost, size and weight are reduced.

Description

Technical field [0001] The invention relates to a noise compensation method of a dual optical comb measurement system, which belongs to the field of optical precision measurement. Background technique [0002] The dual optical comb system is an emerging spectrum measurement tool, which makes full use of the optical frequency comb (abbreviated as optical comb) characteristics of high spectral bandwidth, high frequency resolution and high frequency accuracy, and is used to quickly measure the frequency and amplitude of the optical system , Phase broadband response. The system uses two optical combs with small repetition frequency differences to construct an interference system. The pulse of one optical comb is used for reference and measurement, and the pulse of the other optical comb is used for sampling. In the measurement process, the sampling pulse and the reference pulse and the measurement pulse periodically overlap, and then the spectrum information is extracted from the ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/45
CPCG01J3/45
Inventor 吴冠豪朱泽斌
Owner TSINGHUA UNIV
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