A.R.C. Laser C-Pro, User Manual, Page: 26 / 40

Manual
C-PRO
26
6.4 Spot Diameters and Energy Densities
The following table contains a list of the diameters of the focused laser beam as a function
of the operating distance
Table 3: Spot diameter depending on operating distance
Operating distance Spot diameter focused Spot diameter defocused
200 mm 100 µm
2.0 mm
250 mm 110 µm
2.1 mm
300 mm 120 µm
2.2 mm
350 mm 130 µm
2.5 mm
400 mm 140 µm
2.9 mm
450 mm 150 µm 3.4 mm
500 mm 160 µm
3.9 mm
Since spot size and laser power are set independently of each other, it is necessary to
check the power setting after changing the spot size as the energy density changes.
The energy density is the distribution of the power to a specific area of the treatment area.
The larger the beam diameter is set, the lower the energy density for the same laser
parameters.
The power density is defined by the following formula:
with , ,
The unit of is
In the table below, the energy densities are calculated for a selection of spot sizes and
capacities.
Table 4: power densities dependent on laser power and spot size
Laser
Power
P [W] CO
2
Beam Spot Size d [mm]
0.1 0.2 0.3 0.4 0.5 1.0 2.0 3.0 4.0
1 12,732 3,183 1,415 796 509 127 32 14 8
2 25,465 6,366 2,829 1,592 1,019 255 64 28 16
3 38,197 9,549 4,244 2,829 1,528 382 95 42 24
4 20,929 12,732 5,659 3,183 2,037 509 127 57 32
5 63,662 15,915 7,074 3,979 2,546 637 159 71 40
10 127,324 31,831 14,147 7,958 5,093 1,273 318 141 80
15 190,985 47,746 21,221 11,937 7,639 1,910 477 212 119
20 254,647 63,662 28,294 15,915 10,186 2,546 637 283 159
25 318,309 79,577 35,368 19,894 12,732 3,183 796 354 200
30 381,971 95,493 42,441 23,873 15,279 3,820 955 424 239