This question pertains to the ability to calculate the laser beam intensity , at a particular point in time when using lasers for the purposes of Cutting and Engraving Materials.
The parameters at play when dealing with this equation so far are:
- Speed the laser is moving at(mm/s)
- Power of the Laser Beam (Watts)
- Diameter / Area of the focussed beam spot (mm)
- Frequency of laser pulse (Hz)
- Duration of laser pulse / rise and fall time of the pulse (ns)
Currently i believe i am able to calculate this laser energy parameter for a Constant Wave laser as follows:
diameter = 1.27 * (focalLength) * Wavelength * ((M^2) / BEAMDIA); beamArea = 2 * pi * (0.5 * diameter); beamIntensity = laserAveragePower / (area * speed); // joules/mm^2
However this does not take into account many of the factors i listed above. So my question is: How can i adjust the above formula to include the listed parameters?
For example, how would this be modified to account for a laser being Pulsed at 100Hz, with average power 100W and a 200ns pulse duration.
I am under the impression the Frequency of the laser pulses need to be converted to a unit of measurement, such as "Pulses Per Inch".