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.

Supply (V)

Driver supply rail.

V_forward (V)

Diode forward voltage at the target current.

Target current (mA)

Desired peak drive current.

Duty cycle (%)

Pulse duty cycle of the drive.

Size the series resistor for a simple laser-diode driver, including pulsed-duty power and average current. 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]

R_series (Ω)

Series resistance that sets the peak current.

Peak resistor power (W)

Resistor dissipation while the diode is on.

Average resistor power (W)

Resistor dissipation averaged over the duty cycle.

Average current (mA)

Mean current over the pulse period.

• 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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