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A laser beam quality measuring device output from an optical fiber

A technology of laser beam quality and beam quality, which is applied in measuring devices, optical radiation measurement, photometry, etc., can solve the problems of small dynamic range and low damage threshold of CCD detectors, so as to avoid distortion and wide measurable laser wavelength The effect of less range and error factors

Active Publication Date: 2017-11-10
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a laser beam quality measurement device output by an optical fiber, the purpose of which is to provide a laser beam quality measurement device based on infrared imaging technology, thereby solving the problems in the prior art The technical problems of low damage threshold and small dynamic range of CCD detectors enable the measurement of the quality of laser beams in strong lasers and wide wavelength ranges

Method used

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  • A laser beam quality measuring device output from an optical fiber
  • A laser beam quality measuring device output from an optical fiber
  • A laser beam quality measuring device output from an optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Laser 1 is a semiconductor laser with an output laser wavelength of 976nm, and optical fiber 2 is a 105 / 125 passive optical fiber. Laser 1 outputs 976nm laser after coupling with optical fiber 2. During the measurement, the output power is set to 4W, the data and its fitting results are as follows Figure 5a is the beam quality factor of the laser output from the fiber in the x direction within the beam section Figure 5b is the beam quality factor of the laser output from the fiber in the y direction of the beam section Wherein, the abscissa z is the position coordinate of the beam section on the optical axis, the ordinate Laser beam width is the beam width, and the curve is the fitting curve of the beam width. The beam quality measurement of the laser is:

Embodiment 2

[0090] Laser 1 is a fiber laser, pumped by a semiconductor laser with a wavelength of 976nm, 20 / 400 ytterbium-doped fiber 2 outputs a laser with a wavelength of 1070nm. During the measurement, the output power is set to 4W. The data and its fitting results are as follows Figure 6a is the beam quality factor of the laser output from the fiber in the x direction within the beam section Figure 6b is the beam quality factor of the laser output from the fiber in the y direction of the beam section Among them, the abscissa z is the position coordinate of the beam section on the optical axis, the ordinate Laserbeam width is the beam width, and the curve is the fitting curve of the beam width. The beam quality measurement of the laser is:

[0091] Compared with existing products, this implementation process has a simple optical path, no attenuation, convenient operation, stable repeated measurement results, and a greatly shortened measurement cycle to 20 minutes. According to ...

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Abstract

The invention discloses an apparatus and method for measuring the laser beam quality of fiber output. The apparatus is composed of a one-dimensional electric displacement table, a three-dimensional lifting table, a clamp, a focusing lens, a collimating lens, a photo-thermal sensor, a thermal infrared imager, a darkroom and a computer and the like. The provided apparatus is an automatic measuring system that is assisted by the thermal infrared imager to carry out focusing adjustment and computer visual controlling. The operation is simple and convenient; the structure is simple; the error introducing factors are reduced; and the high-light-intensity large-beam dimension, and random-wavelength laser beam quality can be measured. Compared with the traditional method having problems of low detector damage threshold and small dynamic range, the provided method and apparatus have the following advantages: the high-power, large-beam-size, and wide-wavelength-range laser beam quality can be measured; the method and apparatus are suitable for laser performance testing or laser performance evaluation and optimization analysis of a scientific research institution or enterprise; the application range is wide; and the cost performance is high.

Description

technical field [0001] The invention belongs to the measurement technology of laser performance parameters, and more specifically relates to a device for measuring the quality of a laser beam output by an optical fiber based on infrared imaging technology. Background technique [0002] The invention belongs to the measurement technology of laser performance parameters, and more specifically relates to a device for measuring the quality of a laser beam output by an optical fiber based on infrared imaging technology. [0003] Laser has the characteristics of monochromaticity, coherence, good directionality and high intensity. With the continuous development of laser technology and people's continuous development and improvement of high-tech products, laser technology is widely used in military, civilian, scientific research and medical fields. Applications are increasingly widespread. The laser beam quality is an important parameter to measure the laser performance. Research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42G01M11/04
CPCG01J1/4257G01M11/04
Inventor 戴能利王朝李进延李海清杨旅云彭景刚
Owner HUAZHONG UNIV OF SCI & TECH
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