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Device and method for precisely measuring laser line width on the basis of cyclic self-heterodyne interferometry

A technology for precise measurement and laser linewidth, applied in the field of spectral measurement, which can solve problems such as the inability of theoretical spectral patterns to match, affecting data accuracy, and affecting actual linewidth reading.

Active Publication Date: 2016-06-22
NAT TIME SERVICE CENT CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this type of scheme, the theoretical spectral shape cannot be well matched with the experimental spectral shape, and at the same time, the peak of the delta function that reflects the coherent characteristics affects the reading of the actual line width, and ultimately affects the accuracy of the data

Method used

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  • Device and method for precisely measuring laser line width on the basis of cyclic self-heterodyne interferometry
  • Device and method for precisely measuring laser line width on the basis of cyclic self-heterodyne interferometry
  • Device and method for precisely measuring laser line width on the basis of cyclic self-heterodyne interferometry

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Embodiment

[0056] as attached figure 1 As shown, in the present embodiment, the system based on the cyclic self-heterodyne method for measuring laser linewidth is composed of the following components:

[0057] Laser: commercial fiber laser, center wavelength 1550nm, line width Δν about 1kHz (from product test report);

[0058] Isolator: 30dB isolation to prevent optical feedback from damaging the laser;

[0059] Coupler 1: Y type, splitting ratio 10:90;

[0060] Coupler 2: Y type, splitting ratio 10:90;

[0061] Coupler 3: X type, splitting ratio 90:10;

[0062] Frequency shifter f1: AOM frequency shift value Λ=50MHz;

[0063] Frequency shifter f2: AOM frequency shift value Ω=40MHz;

[0064] Attenuator: adjust the optical power of the circulating optical path, and reduce the fiber noise (such as parasitic noise) in the fiber loop;

[0065] Optical fiber ring: light length 20km, delay 100us(τ 0 =n·L / c), attenuation 4dB, wound on the aluminum fiber optic disc in a symmetrical form; ...

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Abstract

The invention discloses a device and method for precisely measuring a laser line width on the basis of cyclic self-heterodyne interferometry. The device comprises a narrow line width laser which is successively connected with an isolator, a first Y-type coupler, a first frequency shifter, a second Y-type coupler, a photoelectric detector, and a frequency spectrograph via fibers. An X-type coupler is connected between the first Y-type coupler and the second Y-type coupler via fibers. The X-type coupler is successively connected with an attenuator, a second frequency shifter, an erbium-doped fiber amplifier, a fiber band-pass filter, a polarization maintainer via fibers so that a closed loop is formed. The device and the method uses cyclic self-heterodyne interferometry based on loss compensation, and a short fiber delay line, does not require complex theoretical simulation and accurate system parameter setting, and may measure laser linewidths at a sub-kHz magnitude accurately.

Description

technical field [0001] The invention belongs to the technical field of spectrum measurement, and relates to a device and method for precisely measuring laser line width, in particular to a device and method for precisely measuring laser line width based on cyclic self-heterodyne interferometry and adopting spectrum separation technology. Background technique [0002] As a means of high-precision measurement, narrow-linewidth lasers have important and extensive applications in scientific research and technical fields, such as optical clocks, high-precision spectroscopy, coherent communications, and laser ranging. The linewidth or coherence length of the laser plays a decisive role in the noise performance, measurement distance, accuracy and sensitivity of these systems. Therefore, it is very important to measure the linewidth of narrow lasers with high precision. At present, there are roughly three methods for measuring spectral linewidth: spectrometer measurement method, fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/02
Inventor 高静陈玖朋焦东东刘杰董瑞芳刘涛张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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