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CO2 laser failure

The CO2 laser is an integrated structure of light, machine, and electricity. Any abnormality in one of them will affect the other aspects, so the failure phenomenon is often a complex and comprehensive failure response. The failure of CO2 lasers is discussed from the following three aspects.

1) No laser output

This is the most frequent failure of CO2 lasers in use. Failure analysis and inspection should be conducted from three aspects.

First check the high-voltage power supply circuit, because the DC high-voltage power supply of this machine is as high as 24kV. Use the switch knob, indicator light and corresponding voltmeter on the panel to analyze and judge the fault. Measure whether the high-voltage power supply circuit is open in the case of power failure, confirm whether the high-voltage transformer itself is normal, measure and check the thyristor and its trigger circuit responsible for adjusting the output voltage, and use a high-voltage meter with a range greater than 30kV when the power is on Measure the voltage value output by the DC high voltage circuit.

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Secondly, check the optical path and carefully observe whether the central axis of the light guide arm holder and the central axis of the CO 2 laser tube coincide (should coincide), and whether the fixed snap ring of the CO 2 laser tube is loose; whether the position of the plano-convex lens on the output side of the laser tube is normal , Whether the output window is clean.

Finally, check the laser tube. If the laser tube discharges normally, but there is no laser output, it may be that the cavity at both ends of the laser tube is damaged or the output window is covered. The laser tube has abnormal discharge and no laser output. It may be that the anode or cathode in the laser tube is damaged, or the working gas in the tube is contaminated by impurity gas. The laser tube has no discharge and no laser output. It may be that the cathode is damaged or aged and cannot emit electrons, the glass at the cathode or anode lead seal is broken or the cavity at both ends of the laser tube leaks, and the air enters the laser tube. The laser tube cannot discharge.

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2) Weak laser output

The cause of such failures is even more difficult to analyze and inspect than failures without laser output. It still needs to be conducted from three aspects: DC high power supply circuit, laser optical path, and laser tube itself, and more emphasis is placed on the quantification of indicators throughout the process. Check whether the value of the power supply voltage is normal, turn the laser power fine-tuning knob to see whether the value of the milliampere meter can change sensitively and continuously. The inspection of the laser tube includes the observation of the appearance structure, the correct position of each link in the optical path, and the calculation of the cumulative work of the laser tube Time (the efficiency decreases and the output decreases after the laser tube ages).

3) Protection circuit failure

The protection circuit failed and the lasers stopped working. Overcurrent protection circuit, to prevent the laser tube from damaging the electrode or the electrode line sealing due to the excessive current caused by the circuit failure (once the explosion, the consequences are serious), engineers and technicians should take regular preventive maintenance to the protection circuit. Passive maintenance (that is, maintenance only after failure) is not advisable.