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High power fiber laser safety control system

A safety control and laser technology, applied in lasers, laser parts, semiconductor lasers, etc., can solve problems such as increasing system prices, adverse effects on brightness system reliability, and reducing radiation quality.

Active Publication Date: 2016-10-26
IPG PHOTONICS CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, in the case of fiber lasers or other types of lasers with radiation delivery fibers, this arrangement inevitably requires radiation to emerge from the fiber and then be input back into the fiber, which reduces the quality (brightness) of this radiation and is detrimental to the overall system. adversely affect the reliability of
Furthermore, this arrangement significantly increases the price of the system

Method used

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  • High power fiber laser safety control system
  • High power fiber laser safety control system
  • High power fiber laser safety control system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0033] figure 2 A pumping module of a fiber laser with a linear pump current control element 22 is shown, wherein the linear pump current control element 22 is a MOSFET.

[0034] image 3 A simplified structure of a pump module of a fiber laser using a high frequency PWM (Pulse Width Modulation) method to control the pump current (buck stage) is shown. and figure 2 different, image 3 The control element 26 in the circuit works in a high-frequency switching mode (hundreds of kilohertz).

[0035] If the voltage applied to the pump diode is below a certain value that defines the threshold current that the diode produces, the diode cannot irradiate enough energy to produce dangerous levels of laser emission. We tentatively specify this safe voltage value as 20 volts, moreover, a supply voltage of the order of about 75 volts is required for normal operation of the pump module. The value 20V is determined by the total number of pumping diodes 21 connected in series as one circ...

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PUM

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Abstract

A laser safety control system is configured with a power source module directly coupled to an AC source. The power source module includes a galvanically isolated DC / DC converter, which has at least one output capacitor, and a safety mechanism. The safety mechanism is configured with first and second safety channels which operate independently from one another so as to switch the normal operating regime of the power source module to the safe regime. In the normal operating regime, its DC output has a high voltage, whereas in the safe regime the DC output has a low voltage lower than the high voltage. The safety channels each include a shutdown circuit and a discharging circuit. The shutdown circuit is operative to switch the DC / DC converter off. The discharging circuit is operative to discharge the output capacitor below to the desired. The switching off DC / DC converter and discharging of the output capacitor define the safe regime of the power source module. The laser safety control system further includes a high power fiber laser system and a laser pump system which receives the DC output from the power source and is prevented from radiating emission in the safe regime of the power source because in the safe regime the low voltage is insufficient for generation the laser emission.

Description

technical field [0001] The present invention relates to the field of laser safety systems and in particular describes a method for electrically placing a high power fiber laser in a safe state by means of a function integrated in the laser power supply. Background technique [0002] High-power lasers pumped with semiconductors (eg, fiber lasers) are widely used for processing various materials. When various human tissues (especially eyes) are directly exposed to high-power laser radiation, this laser radiation is dangerous to the human body. Therefore, system integrators should provide safety measures for protecting personnel working around operating high-power lasers. These measures generally involve constructing a closed protective booth around the workpiece to be laser processed. The workbench prevents laser radiation from penetrating beyond the boundaries of the workbench, and the workbench can be accessed, for example, to change workpieces or for other purposes. Obvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/13H01S3/067
CPCH01S3/094003H01S3/094076H01S5/06825H01S5/0428H01S5/4018H01S3/067H01S3/0912H01S3/094042H01S5/4025H01S5/42H01S3/13
Inventor 瓦伦顿·沃罗登谢尔盖·古斯科夫
Owner IPG PHOTONICS CORP
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