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A method and device for measuring laser frequency stability

A technology of frequency stability and measurement method, which is applied in the direction of instruments, etc., can solve problems that have not been extended to the measurement of laser frequency stability, and achieve the effect of expanding the frequency difference range and improving accuracy

Inactive Publication Date: 2015-11-18
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Both of the above two technologies involve signal processing technology based on crystal non-uniformly broadened absorption spectrum, but this technology has not been extended to the field of laser frequency stability measurement

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  • A method and device for measuring laser frequency stability
  • A method and device for measuring laser frequency stability
  • A 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. The frequency selected for frequency calibration is f D The frequency of the RF signal and the set sampling time τ is f RF radio frequency signal;

[0045] Wherein, the method of frequency calibration and sampling time setting in step 1 specifically includes: first select the frequency as f D Frequency calibration RF signal, frequency calibration; then the selected frequency is f RF The radio frequency signal, set the sampling time τ;

[0046] Step 2. Calculate the mapping relationship f(t) between the output frequency and time of the read laser, and obtain the mapping relationship f between the frequency and time of spectral hole burning h (t), wherein the read laser ...

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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 radio frequency signal which is used for frequency calibration and has frequency f<D> and a radio frequency signal which is used for setting sampling time tau and has frequency f<RF>; calculating the mapping relationship f(t) between the output frequency and time of a reading laser to obtain the mapping relationship f<h>(t) between the frequencies and time of spectral burnt holes; modulating the radio frequency signal with the frequency f<RF> to a laser to be tested with nominal frequency f<c> to form a dimmed signal with carrier frequency f<c>(t) and measuring the time tau corresponding to the spectral burnt holes of the side frequency of the dimmed signal to obtain the side frequency of the dimmed signal and then obtain the i frequency drift delta f<c>(i) 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 马秀荣陈雷王伟张双根
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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