Method and device for measuring laser frequency stability

A technology of frequency stability and measurement method, applied in instruments and other directions, can solve problems such as small frequency difference, and achieve the effect of improving accuracy and expanding frequency difference range

Inactive Publication Date: 2012-09-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for measuring the frequency stability of a laser, which overcomes the defects in the prior art that a high-stability reference light source is required for measuring the frequency stability of a laser and the frequency difference with the laser to be measured is small

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  • Method and device for measuring laser frequency stability
  • Method and device for measuring laser frequency stability
  • Method and device for measuring laser frequency stability

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Embodiment Construction

[0042] The following will refer to Figure 1-11 Specific embodiments of the present invention will be described.

[0043] Embodiments of the present invention provide a method for measuring laser frequency stability, such as figure 1 As shown, it specifically includes the following steps:

[0044] Step 1. Select a periodic electrical signal as the read laser chirp control signal, wherein the read laser refers to the laser used to generate the chirped optical signal; by adjusting the period T of the read laser chirp control signal, set the The sampling time τ of the laser output frequency; by adjusting the amplitude U of the read laser chirp control signal 0 , set the frequency measurement range of the laser to be tested;

[0045] Wherein, the sampling time setting method in step 1 specifically includes: selecting the read laser chirp control signal u(t)=u(t+T); by adjusting the period T of the read laser chirp control signal u(t) , set the sampling time τ=nT of the corresp...

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Abstract

The invention discloses a method and device for measuring laser frequency stability. The method comprises the following steps of: selecting a periodic electric signal as a chirp control signal of a reading laser; setting the sampling time tau of the output frequency of a laser to be tested by adjusting the period T of the chirp control signal of the reading laser; calculating the mapping relationship f(t) between the output frequency and time of the reading laser to obtain the mapping relationship between the frequencies and time of spectral burnt holes; measuring the time corresponding to the spectral burnt holes formed by light signals to be tested output by the laser to be tested with nominal frequency f<c> to obtain the output laser frequency of the laser to be tested and then obtain the j frequency drift delta f<c>(j) in the sampling time tau; and carrying out statistics on the frequency drift to realize measurement of the frequency stability of the laser to be tested in the sampling time tau. By adopting the method and the device, the problem in the prior art that reference light sources with ultrahigh stability and small frequency difference with the laser to be tested are needed for measuring the laser stability is solved.

Description

technical field [0001] The invention relates to laser frequency stability measurement technology, in particular to a laser frequency stability measurement method and device. Background technique [0002] Laser is a kind of optical frequency electromagnetic wave, which has excellent coherence, is similar to radio waves, and is easy to modulate; in addition, laser has the advantages of high frequency, wide frequency bandwidth, large transmission information capacity, good directionality, and long transmission distance. , so it is an ideal light source for light to transmit information. It plays an increasingly important role in the fields of optical communication, optical information processing, and optical measurement. For example, precision interferometry uses the laser wavelength as a "ruler" and uses the interference principle of light to measure various physical quantities such as length, angle, displacement, and speed. Therefore, the accuracy of laser frequency will dir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 马秀荣王伟陈雷张双根
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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