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.

Tube length (cm)

Optical cavity length between mirrors, which may differ from plasma-tube length.

Gain bandwidth (GHz)

Gain-bandwidth assumption used for the spacing comparison.

Compare a He-Ne 632.8 nm optical cavity's c/(2L) axial-mode spacing with an explicit gain-bandwidth assumption; this does not guarantee mode-hop-free operation. 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]

Mode spacing (GHz)

Axial mode spacing c/2L.

Spacing covers bandwidth

True when one mode covers the gain bandwidth.

Max criterion length (cm)

Longest tube keeping single-mode spacing (~10 cm).

Note

Design guidance for the length.

• 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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