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.

Distance (mm)

Working distance to the target surface.

VCSEL divergence (°)

Typical circular full-angle divergence of a VCSEL.

Fast axis (°)

Edge-emitter fast-axis full-angle divergence.

Slow axis (°)

Edge-emitter slow-axis full-angle divergence.

Compare far-field spot diameters of a VCSEL and an edge emitter at a given working distance from their full-angle divergences. 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]

VCSEL spot (mm)

Spot diameter from the circular VCSEL beam.

Fast-axis spot (mm)

Spot diameter along the edge-emitter fast axis.

Slow-axis spot (mm)

Spot diameter along the edge-emitter slow axis.

Astigmatism note

Astigmatism remark for edge emitters.

• 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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