Method and system for eliminating double-optical-comb frequency spectrum aliasing

A spectrum aliasing and dual-comb technology, which is applied in the radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation, etc., can solve the problem of the unavailability of the dual-comb system, the great influence of the deviation frequency change, the limitation of repetition frequency and deviation Frequency adjustable range and other issues to achieve the effect of improving the ability of long-term stable measurement, reducing the requirements of the use environment, and avoiding dead zones
CN112241014APending Publication Date: 2021-01-19TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2021-01-19

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Abstract

The invention relates to a laser ranging method and system for eliminating double-optical-comb frequency spectrum aliasing, and the system comprises a first optical comb, a signal optical pulse emitted by the first optical comb passes through a first spectroscope, one beam of light enters a reference mirror, the other beam of light enters a measurement mirror, and the reference mirror and the light reflected by the measurement mirror are emitted to a second spectroscope through the first spectroscope; a second optical comb which emits a local oscillation light pulse to enter the second spectroscope and interferes with the light emitted by the first spectroscope; a first band-pass filter which is used for acquiring a frequency component of a part of light emitted by the second spectroscopein a certain frequency range; a second band-pass filter which is used for acquiring a frequency component of the other part of light emitted by the second spectroscope in another frequency range; anda signal processor which is used for processing the acquired frequency component signal to complete distance measurement.
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Description

technical field

[0001] The invention relates to a method and system for eliminating double-comb spectrum aliasing, and relates to the technical field of optical precision measurement. Background technique

[0002] Absolute distance measurement has important applications in the fields of large-scale precision machinery manufacturing and aerospace. Traditional pulsed laser ranging or interferometric ranging techniques are not suitable for absolute distance measurement with large range, high precision and high speed. The new type of laser light source born in this century - femtosecond laser frequency comb, referred to as optical frequency comb or optical comb, has the characteristics of wide spectrum, multiple longitudinal modes, high coherence, narrow linewidth and so on. The emergence of optical frequency combs has promoted the rapid development of precision measurement technology. As a precision optical ruler in the time domain and frequency domain, the optical frequency ...

Claims

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