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Laserin perusteet

Pulssin huipputeho

Hetkellinen huipputeho pulssienergian ja pulssin leveyden perusteella.

P_peak = E / τ

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Calculation guide

How pulse peak power is calculated

Peak power is the highest optical power during a pulse. This calculator converts pulse energy and an equivalent pulse duration, then lets you solve for any one of the three quantities.

Formula and unit conversion

Equivalent rectangular pulse P_peak = E / τ_eff

Use an equivalent rectangular duration. Fill E in mJ and τ_eff in ns, then P_peak is returned in W.

Direct unit form P_peak[W] = E[mJ] / τ_eff[ns] × 10^6

The 10^6 factor combines the mJ-to-J and ns-to-s conversions.

Gaussian pulse from FWHM P_peak ≈ 0.939 × E / τ_FWHM

For an optical-power envelope with a Gaussian shape. A sech² pulse uses approximately 0.881 instead.

Units used on this page

Muuttujat ja yksikötYksikköHuomautukset
Pulse energy EmJ1 mJ = 10^-3 J; 10 µJ = 0.01 mJ.
Pulse width τns1 ns = 10^-9 s. Enter the energy-equivalent rectangular width, not an arbitrary visible width.
Peak power PW1 W = 1 J/s. This is optical peak power, not pulsed electrical current.

Worked examples

  1. Energy to peak power E = 10 µJ, τ_eff = 100 ns → P_peak = 0.01 / 100 × 10^6 = 100 W

    These are the nominal values of PLD905-100W-M at 100 ns.

  2. Peak power to pulse energy P_peak = 100 W, τ_eff = 100 ns → E = 100 × 100 × 10^-6 = 0.01 mJ

    The round trip returns 10 µJ.

  3. Gaussian FWHM correction E = 10 µJ, τ_FWHM = 100 ns → P_peak ≈ 0.939 × 100 = 93.9 W

    Use the waveform correction when the datasheet specifies a Gaussian FWHM instead of an equivalent rectangular width.

Engineering limits

  • Pulse definition

    The base formula assumes a rectangular pulse. FWHM is not the same as the energy-equivalent duration; convert it first or apply the shape factor shown above.

  • Ratings are coupled

    Peak power cannot be raised by shortening a pulse without considering current, duty cycle, junction heating and the diode's safe operating area. The PLD905 standard family quotes 1–100 ns pulses and 0.1% maximum duty cycle; confirm the exact model and bin.

  • Duty-cycle check

    Duty = τ × f_rep. At 100 ns, a 0.1% limit caps repetition rate at 10 kHz. Average power is P_avg = E × f_rep; verify it separately against the thermal budget.

  • Energy is operating-point dependent

    Datasheet pulse energy is usually stated at a defined current, width and temperature. Do not assume that peak power or energy scales linearly outside that point.

  • Optical measurement

    Driver rise time, ringing, overshoot, optical losses and detector bandwidth all change the measured result. Use a calibrated optical waveform and integrate energy over the full pulse.

  • Laser safety

    Peak power, average power, wavelength and pulse duration all enter the laser-safety assessment. Keep the system inside its declared laser class and applicable standards.

Related pulsed laser products

Representative catalogue routes for comparing rated peak power, pulse energy and pulse duration. The live recommendation list above is filtered by the values currently entered.

  • PLD905-40W-M 905 nm · 40 W · 1–100 ns

    Compact TO56 starting point for short-range ranging and LiDAR.

  • PLD905-100W-M 905 nm · 100 W · 10 µJ @ 100 ns

    Matches the default worked example and is useful for a direct calculation check.

  • PLD905-180W-M 905 nm · 180 W · 18 µJ @ 100 ns

    Six-emitter part for longer-range ranging and time-of-flight systems.

  • PLD905-300W-M 905 nm · 300 W · 30 µJ @ 100 ns

    Higher-power nine-emitter option; check thermal design and driver current.

  • LZ1535-1KHz-5ns-40uJ-25mm 1535 nm · 40 µJ @ 5 ns · 1 kHz

    Cross-check: the same equivalent rectangular calculation gives about 8 kW for 40 µJ in 5 ns.

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