Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter

A measurement method and isolator technology, which is applied in the direction of measuring devices, optical instrument testing, and testing optical performance, etc., can solve the problem of low extinction ratio accuracy, achieve accurate measurement results, and improve test accuracy.

Inactive Publication Date: 2012-05-23
BEIJING GK LASER TECH
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  • Claims
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Problems solved by technology

[0008] In order to solve the problem of low accuracy of measuring the extinction ratio of the magneto-optical isolator in the prior art, the present invention provides a method for measuring the extinction ratio of the magneto-optic isolator with convenient operation and high efficiency

Method used

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  • Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter
  • Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter
  • Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter

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Embodiment Construction

[0026] Please refer to figure 1 Firstly, the measuring device 1 used in the first embodiment of the measuring method of the optical rotation angle of the magneto-optical isolator and the measuring method of the extinction ratio of the magneto-optical isolator of the present invention is introduced. The measuring device 1 comprises a laser 11, a polarizer 12, an aperture 13 with an adjustable aperture, a beam expander 14, an aperture 15 with an adjustable aperture, and a tooling for installing the magneto-optical isolator to be tested. 16 . A beam reducer 17 , an analyzer 18 , a photoelectric sensor 19 and a guide rail 10 . The guide rail 10 includes a plurality of sliding seats 101 that can slide along the guide rail 10 . The magneto-optical isolator to be tested is installed on the tooling 16 . Laser 11, polarizer 12, aperture 13, beam expander 14, aperture 15, frock 16, beam reducer 17, analyzer 18 and photoelectric sensing device 19 are installed on the sliding seat 101 i...

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Abstract

The invention discloses a method for measuring an extinction ratio of a magneto-optical isolator, and a device for measuring an optical parameter. The method comprises the following steps of: supplying a laser, a beam expanding lens, a beam shrinking lens, an analyzer and a photoelectric sensing device which are arranged along a light path sequentially; rotating the analyzer to a reference angle indicating value theta1, wherein a reading of the photoelectric sensing device is P1; putting a polarizer between the laser and the beam expanding lens, and rotating the polarizer to make the reading of the photoelectric sensing device equal to a first minimum value P2; putting the magneto-optical isolator to be measured between the beam expanding lens and the beam shrinking lens, adjusting the magneto-optical isolator to make the reading of the photoelectric sensing device be maximum, and rotating the analyzer to make the reading of the photoelectric sensing device equal to a second minimum value Pmin; rotating the analyzer to make the reading of the photoelectric sensing device equal to a maximum value Pmax; and substituting the Pmax and the Pmin into the formula Ex=Pmax / Pmin, and calculating the extinction ratio Ex of the measured device. The method is high in measuring precision.

Description

technical field [0001] The invention relates to a measuring method and measuring device for the extinction ratio of a magneto-optical isolator. Background technique [0002] Extinction ratio is an important parameter to measure the optical performance of optical components, reflecting the defects that may exist inside it, such as internal stress, optical inhomogeneity, etc. Its extinction ratio is an important parameter to measure the optical inhomogeneity. [0003] The regulations adopt: Pmax indicates the highest optical power in the direction of the long axis of the elliptical Gaussian beam in the plane perpendicular to the optical axis, and Pmin indicates the minimum optical power in the direction of the long axis of the elliptical Gaussian beam in the plane perpendicular to the optical axis. Then the extinction ratio is defined as: [0004] EX=10lg(Pmax / Pmin) (1) [0005] The unit of extinction ratio is dB. [0006] In practical application, the test of extinction r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01M11/04
Inventor 樊仲维王家赞
Owner BEIJING GK LASER TECH
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