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Method for measuring coaxial error of thru-beams

A measurement method, technology of light beams, applied in the field of optical systems

Active Publication Date: 2012-11-14
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is an observation residual error in this method, that is, the coincidence degree that the human eye can distinguish is generally about 0.2mm. The larger the , the smaller the angle error between the two beams
However, in an actual system, due to the limitation of the size of the overall optical path, the distance between the two insertion observation screens is often about tens of centimeters. In the process of the development of optical systems towards miniaturization and integration, this distance has been less than 10 centimeters in many cases , which brings great difficulties to the judgment in the adjustment process, making the remaining angle error more and more large, often unable to meet the accuracy requirements of some systems with high alignment accuracy requirements such as fiber coupling and injection locking

Method used

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  • Method for measuring coaxial error of thru-beams

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Embodiment 2

[0043] In embodiment 2, for non-polarized light, the measurement optical path is simpler, only need to change the polarizing beam splitting prism into a beam splitting prism, and remove the quarter wave plate at the same time.

[0044] The method for measuring the coaxial error of the beam of light includes the following steps:

[0045] 1. The two pairs of beams to be measured are respectively called the first beam and the second beam, and a beam splitting prism 5 is inserted in the optical path of the two pairs of beams, so that the beam splitting surface of the beam splitting prism 5 and the The beam is at 45°;

[0046] ②In the direction of the reflected light of the second light beam of the beam splitting prism 5, a corner reflector 2 and a light intensity detector 1 are arranged in sequence, the corner reflector 2 is placed on the two-dimensional translation adjustment frame 3 and the corner reflector 2 The hypotenuse is perpendicular to the reflected light beam, and the ...

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Abstract

A method for measuring a coaxial error of thru-beams is disclosed. In the invention, by using a beam splitter prism, a two dimension translation adjuster, an angle reflector, a light intensity detector and an observation screen, a coincidence error of two thru-coincidence lights can be measured. By using the method, equipment is simple; observation is easy; measurement is convenient; coaxial adjustment of the thru-beams is fast, convenient, accurate and reliable.

Description

technical field [0001] The invention belongs to an optical system, in particular to a method for measuring the coaxial error of a beam of light. Background technique [0002] In the optical system, it is often required to combine two parallel beams of light (laser) to be coupled together into optical or electronic components. For example, in the injection locking experiment of semiconductor lasers, it is necessary to reverse the injected laser beam according to the direction of the output laser. Coupled into the semiconductor gain medium of tens of microns; on the optical platform with fiber output, in the process of coupling the free-space laser to the fiber, it is necessary to adjust the coupled light to coincide with the reference light. In such a similar system, the coincidence degree of the two laser beams includes the coincidence of the optical axes and directions (angle) of the two beams of light. Often the requirements for the coincidence of the beam directions in t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/26
Inventor 吕德胜赵剑波屈求智汪斌刘亮王育竹
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI