The values of average irradiance listed in the above
table should be used as guidelines to determine if
your operating conditions may cause damage to the
apertures in your NanoScan scanhead for short time
exposure at power levels <3W only. For long term
exposures (>5 minutes) at higher power levels the
damage thresholds may be reduced.
exercise caution!
nanoScan operating Space charts
NanoScan Operating spaces for CW lasers include
the appropriate damage thresholds for nickel and
blackened nickel slit apertures. Figure 1 shows the
Operating Space Chart for a NanoScan/Pyro/9/5; here
there is only one damage threshold line for nickel slits
because blackened slits are not available with pyro
scanheads.
Refer to the NanoScan Installation and Operation
manual for Operating Space Charts for all scanheads.
Fluence exposure thresholds for pulsed lasers are given
in Table 2 for nickel alloy, blackened nickel alloy and
copper slit apertures.
Table 1. Recommended maximum average laser
irradiance incident on blackened and unblackened Nickel
NanoScan slit apertures for short time exposures.
aperture
Slit (µm)
Visual Damage threshold (W/cm
2
)
355nm
532nm
1064nm
10.6µm
Unblackened
1-2
2x10
5
3x10
5
1x10
6
NA
Unblackened
5-25
2.7x10
5
4x10
5
1.2x10
6
3.5x10
6
Blackened
1-2
7x10
3
1x10
4
3x10
4
NA
Blackened
5-25
7x10
3
1x10
4
3x10
4
NA
aperture
Visual Damage threashold (J/cm
2
)
190-400nm
400-700nm
700nm-3µm
>3µm
Unblackened Ni
0.06
1
1
1
Blackened Ni
0.01
0.01
0.01
0.01
Copper
NA
NA
2.5
5
Table 2. Recommended maximum fluence incident on blackened and unblackened
Nickel, and copper NanoScan slit apertures for short time exposures.
Figure 1. Operating Space Chart for the
NanoScan/Pyro/9/5.
Operating Range is at Peak Sensitivity of Detector.
Operating Space is NOT absolute.
THIS CHART TO BE USED AS A GUIDE ONLY
