What is the reason that the laser tube cannot start up normally after it has been unused for more than one week? What should be done in this case?

If the laser tube has been unused for more than one week, it may not be able to perform pre-ionization when it starts to use. In this case, the laser control circuit will detect a high backward reflection voltage, which will result in ‘SWR error’ & ‘Laser OK / Fault’, and cause the laser tube to fail to start normally.

Therefore, in order to avoid from triggering SWR errors, it is recommended to adjust the duty cycle of the modulation signal ≤3% and the frequency < 25KHz when it starts to run.

If an SWR error has occurred, the user can continue to apply the modulation signal to the laser tube, and the control circuit board inside the laser tube will send auxiliary ionization pulses to assist the laser in ionization.

Steps for startup correctly:

1. Switch on the laser tube and wait for one minute;

2. Adjust the duty cycle of the modulation signal ≤ 3%, the frequency < 25KHz, then pre-warm-up for 5 minutes;

3. Gradually increase the power to vary from 0-100%, it takes 2 minutes;

4. Start doing work

Note: In the case that the laser device is frequently used, its pre-ionization time is 30s only, which is determined by the internal program of the laser tube. It will automatically execute after each time that power outage and power on again.