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Spectral measurement method based on optical frequency combs

An optical frequency comb and spectral measurement technology, which is applied in the direction of color/spectral characteristic measurement, measuring device, spectrum investigation, etc., can solve the problems of cumbersome construction and precise control methods, difficult system maintenance, and complicated operation, etc., and achieve reduction in volume and Difficulty in maintenance, high stability and flexible operation

Active Publication Date: 2015-01-28
CHONGQING HUAPU INFORMATION TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

The dual-comb spectral measurement method has the obvious advantages of fast measurement speed, high spectral resolution, and high signal-to-noise ratio. However, in the actual measurement process, the construction and precise control methods of two optical frequency combs are cumbersome and complicated. The maintenance of the entire system Difficult and expensive

Method used

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  • Spectral measurement method based on optical frequency combs
  • Spectral measurement method based on optical frequency combs
  • Spectral measurement method based on optical frequency combs

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Embodiment 1

[0025] Embodiment 1: This embodiment specifically relates to a spectral measurement method based on an optical frequency comb. The measurement method first utilizes an optical frequency comb controllable in the time domain and frequency domain to actively modulate a ring laser resonator based on a phase modulator , making it a second optical frequency comb with a slight difference in repetition frequency from this optical frequency comb, and performing dual-comb spectral detection to obtain an interference signal carrying the information of the sample to be tested; at the same time, the two optical frequency combs Beat the frequency with the continuous frequency-stabilized laser respectively, and the difference frequency signal of the two beat-frequency signals obtained is mixed with the interference signal, and the signal obtained by detecting the mixed frequency is used as the spectral signal for Fourier analysis to restore the sample to be tested optical information.

[0026]...

Embodiment 2

[0043] Embodiment two: if image 3 As shown, this embodiment specifically relates to a method for measuring the absorption spectrum of water molecules using a near-infrared dual-comb system, and the specific steps are as follows:

[0044] (1) An erbium-doped fiber optical frequency comb 19 is used as one of the stable light sources of the dual-comb spectral detection system, its output center wavelength is around 1550nm, the average power is on the order of 1W, the pulse width is around 100fs, and the repetition rate is The average value is 250MHz; the optical frequency comb is locked on the ultra-narrow linewidth continuous frequency stabilized laser 21 through the servo feedback circuit system, and the extremely high spectral line precision generated by the atomic transition in the outside world can be transferred to the optical frequency comb system.

[0045] (2) The cavity structure of the erbium-doped fiber optical frequency comb seed source 20 based on the phase modulato...

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Abstract

The invention discloses a spectral measurement method based on optical frequency combs. The measurement method is characterized in that firstly, an annular laser resonant cavity based on a phase modulator is actively modulated by use of a first optical frequency comb controllable in time domain and frequency domain so that the annular laser resonant cavity is converted into a second optical frequency comb having tiny difference in repetition frequency with the first optical frequency comb, and spectrum detection is performed on the two optical frequency combs to obtain an interference signal carrying the information of a sample to be tested, and meanwhile, frequency beating is performed on the two optical frequency combs and continuous frequency stabilized laser, respectively, the difference frequency signal of two obtained beat frequency signals is mixed with the interference signal, and a signal obtained by virtue of detection mixing is taken as a spectral signal for Fourier analysis so as to reduce the optical information of the sample to be tested. The spectral measurement method has the advantages that the error of the spectral detection due to own phase drift of a dual-optical comb system can be eliminated, and therefore, the resolution and the detection accuracy of the spectral measurement can be improved.

Description

technical field [0001] The invention belongs to the field of ultrafast laser science and technology, and in particular relates to a spectral measurement method based on an optical frequency comb. Background technique [0002] The basic principle of spectral analysis is that under the action of laser, each atom will absorb or emit its own characteristic spectral lines, so the substance can be identified and its chemical composition can be determined according to the spectrum. Spectral measurement technology is an important embodiment of the application of laser, an abstract physical quantity, in production and life. It is widely used in many fields such as explosives detection, biological sample analysis, and metal object detection. At present, the relatively mature spectral measurement method is based on the principle of Michelson interferometer, which divides the input laser into two beams, one of which reaches the moving mirror moving at a constant speed, and the other rea...

Claims

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Application Information

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IPC IPC(8): G01J3/42G01N21/31G01N21/359
Inventor 李文雪白东碧曾和平
Owner CHONGQING HUAPU INFORMATION TECH CO LTD
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