Power feedback and thermal lens effect
Is optical power feedback effective for stable processing?
The thermal lens effect is a basic characteristic of YAG lasers.
It is considered that the thermal lens effect cannot be solved by means of optical power feedback.
Because…
Energy density at the processing point is varied due to the thermal lens effect caused by physical change in the YAG rod. It is very difficult to compensate such change in energy density by an electrical control method.
Characteristics optical power feedback
For one thing, it solves the thermal lens effect by means of electrical control to achieve stable processiong from the 1st shot.
Trace of welding
Without optical power feedback |
With optical power feedback:
Such phenomenon is not possible. |
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