Use this laser calculation or lookup for a first-pass optics, pulse, beam, gain-medium, diode, fiber, or safety comparison under explicitly stated wavelength and operating conditions.

Wavelength (nm)

Wavelength to classify.

Classify a wavelength by the ocular tissue that absorbs it and explain why 1550 nm Er-fiber light carries the 'eye-safe' label. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Reaches retina

Whether the wavelength reaches the retina.

Hazard region

Ocular tissue that absorbs the radiation.

Eye-safe label

Whether the 'eye-safe' marketing label applies.

Safety note

Absorption explanation for the band.

• Laser behavior depends on wavelength, mode, coherence, pulse shape, beam quality, cavity and optical losses, material data, temperature, alignment, nonlinear effects, damage thresholds, and measurement definitions. Lookup values are not substitutes for current device data or laser-safety analysis.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Verify constants and limits with primary literature and manufacturer data, propagate tolerances, model the complete optical train, and apply the relevant laser safety standard.

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  Explain N2 337 nm self-terminating operation from the ~40 ns upper-state lifetime relative to the pump pulse duration.

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  Compare nominal 1908 nm thulium-fiber and 2090 nm holmium:YAG sources using tabulated water absorption and the corresponding 1/µa penetration estimate.

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  Convert step-index fiber core/cladding indices, core radius, and wavelength into numerical aperture, V-number, and Marcuse mode-field diameter.