Laser peak power testing method and device

A technology of peak power and test method, applied in the field of laser peak power test method and device, can solve the problem of inability to accurately calculate the peak power of the laser, and achieve the effect of simplifying the test process

Inactive Publication Date: 2020-04-21
SUZHOU EVERBRIGHT PHOTONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the peak power of the laser cannot be accurately calculated in the prior art, thereby providing a method and device for testing the peak power of the laser

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  • Laser peak power testing method and device
  • Laser peak power testing method and device
  • Laser peak power testing method and device

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Embodiment 1

[0031] When testing the peak optical power of a pulsed or quasi-continuous laser, the average optical power P of the laser is generally measured with a thermal pile power meter avi , then measure the pulse waveform of the output light and calculate the pulse width t wp and repetition frequency f p , or measure the pulse width t of the input current pulse with a current gun and an oscilloscope wi and repetition frequency f i , the product of pulse width and repetition frequency to get the duty cycle, divide the average optical power by the duty cycle to get the peak power, the calculation formula is: or, When the input drive pulse current and laser signal are ideal square waves, the accurate peak power can be calculated by the above measurement methods, but in actual situations, the current generally cannot present an ideal square wave, resulting in the laser signal not being an ideal square wave. Therefore, in this method, the peak power of the laser can only be roughly ...

Embodiment 2

[0049] This embodiment provides a laser peak power testing device, such as Figure 9 shown, including:

[0050] Integrating sphere 1 is used to obtain the pulse laser signal that laser device 5 sends, and in a specific embodiment, the size of integrating sphere 1 can be selected according to actual needs, and in the embodiment of the present invention, the diameter of integrating sphere 1 selected is 250mm, Caliber 50mm. For a detailed description of the pulsed laser signal, refer to the description of step S10 in Embodiment 1 above.

[0051] Detector 2 is used to convert the pulsed laser signal into the first voltage signal. In a specific embodiment, the selection of detector 2 can be selected according to actual needs. The detector 2 selected in the embodiment of the present invention is ThorlabsPDA100A Model, Si photodetector 2 with a detection wavelength range of 340nm-1100nm.

[0052] The data acquisition card 3 is used to periodically acquire the first voltage signal,...

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Abstract

The invention provides a laser peak power testing method and device, and the method comprises the steps: obtaining a pulse laser signal of a laser; converting the pulse laser signal into a first voltage signal; periodically acquiring the first voltage signal, and calculating an optical power value according to a preset calibration coefficient and the first voltage signal, and the preset calibration coefficient being a parameter representing a corresponding relationship between the voltage signal and the optical power value; and comparing the optical power value in the preset time period, and determining the maximum value of the optical power value as the peak power of the laser. According to the method, the peak power is calculated; the first voltage signal is acquired every a period of time; compared with the method for calculating the peak power through the average optical power in the prior art, the method has the advantages that the actual waveform of the laser signal can be reflected by calculating the optical power values at different moments, so that the calculated peak power of the laser is closer to the reality.

Description

technical field [0001] The invention relates to the field of laser testing, in particular to a laser peak power testing method and device. Background technique [0002] When testing the peak optical power of a pulsed or quasi-continuous laser, the average optical power of the laser is generally measured with a thermal pile power meter, and then the pulse waveform of the output light is measured to calculate the pulse width and repetition frequency, and the product of the pulse width and repetition frequency To get the duty cycle, divide the average optical power by the duty cycle to get the peak power. The above measurement methods can calculate accurate peak power when the input drive pulse current and laser signal are ideal square waves, but in actual situations, the input drive pulse current has rising and falling edges, and it cannot be maintained in the flat top area of ​​the waveform. A consistent current generally cannot present an ideal square wave, resulting in a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/42
CPCG01J1/42
Inventor 周立梁志敏王俊钱承吴天宝
Owner SUZHOU EVERBRIGHT PHOTONICS CO LTD
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