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Laser Hazard Analysis

ANSI Z136.1 MPE, hazard zone & eyewear OD.

ANSI Z136.1

Laser Hazard Analysis

Maximum permissible exposure · Nominal hazard zone · Protective eyewear OD · CW & pulsed · 180 nm – 1000 µm

Presets seed power, wavelength and CW/pulsed. Beam divergence, beam Ø and focusing-head values are yours to enter — saved per source on this device.
αmin = 1.5 mrad, αmax = 100 mrad. α = source size ÷ viewing distance.
Full report
Range Equations · Z136.1 App. B

Nominal Hazard Zone (NHZ)

Four exposure scenarios, each computed from the MPE above. The largest is the controlling NHZ — the minimum extent of the laser-controlled area.

Shared
Intrabeam
Focusing optics (lens-on & specular)
Reflections
NHZ range equations per ANSI Z136.1 Appendix B (validated against OSHA OTM III:6 worked examples). All four scenarios use the ocular MPE above as an irradiance limit (W/cm²); for pulsed lasers that limit is the governing per-pulse MPE × PRF. Distances are nominal ocular hazard ranges — verify against the current standard, and remember the beam's working purpose (cutting/cleaning) makes it hazardous at the workpiece regardless of NHZ.