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.

Collimator f (mm)

Focal length of the fast- or slow-axis collimator.

Smile (µm)

Peak deviation of the emitter line from straight.

Budget (µrad)

Allowed pointing error for the application.

Working distance (mm)

Distance to the target where the walk-off matters.

Translate the smile (emitter curvature) of a diode bar into far-field pointing error after collimation and check it against the budget. 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]

Pointing (µrad)

Beam tilt produced by the smile.

Within budget

Whether the tilt stays inside the allowed budget.

Spot shift (mm)

Spot walk-off at the working distance.

• 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.

• M² Beam Quality Product

  Compute the M² beam-quality factor and beam-parameter product from waist radius, far-field half-angle divergence, and wavelength.

• VCSEL vs Edge-Emitter Divergence Comparison

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

• ECDL Littrow/Littman Config Selector

  Compare Littrow and Littman external-cavity diode laser configurations and return their beam-stability, linewidth, and cavity-length characteristics.