Photonics Calculators
Free engineering tools for lasers, optics, fiber systems, spectroscopy, electronics, and laboratory calculations.
ephotonics · Engineering tools
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Explore free photonics calculators for laser design, optics, spectroscopy, and electronics. Calculate beam parameters, convert optical units, or work through laboratory measurements such as Raman shift and Beer Lambert absorbance.
Showing 54 of 54 calculators
Laser Engineering & Pulsed Systems
Work with pulse energy, beam propagation, thermal effects, and laser operating conditions.
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Laser Pulse Energy Calculator
Find energy per pulse in joules from average laser power and repetition rate.
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Laser Peak Power Calculator
Calculate peak laser power from pulse energy and pulse duration.
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Duty Cycle Calculator
Find the fraction of each pulse period during which a laser or signal is active.
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Laser Power Density & Fluence
Calculate irradiance in W/cm² or energy fluence in J/cm² from beam area.
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Laser Spot Size Calculator
Estimate the focused spot diameter of a Gaussian laser beam.
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Beam Expander Calculator
Calculate beam magnification and the corresponding change in divergence.
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Beam Divergence Calculator
Calculate the far-field divergence of a Gaussian beam as a half or full angle.
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Rayleigh Range Calculator
Find the distance from the beam waist where the beam area doubles.
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Wall-Plug Efficiency Calculator
Compare a laser’s optical output power with its electrical input power.
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Laser Safety / NOHD Calculator
Estimate nominal ocular hazard distance from laser and exposure parameters.
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Laser Heat Transfer Calculator
Estimate material temperature rise during laser exposure.
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Laser Diode Temperature Tuning
Calculate temperature changes for adjusting a laser diode’s wavelength.
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Laser Diode Lifetime Calculator
Estimate temperature-related lifetime changes using the Arrhenius model.
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Coherence Length Calculator
Estimate temporal coherence length from spectral bandwidth or linewidth.
Optics & Photonics Physics
Calculate refraction, reflection, lens geometry, and light collection.
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Snell’s Law Calculator
Calculate refraction angles or refractive indices at an optical interface.
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Fresnel Reflection Calculator
Calculate optical reflection at an interface between two materials.
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Critical Angle Calculator
Find the critical angle for total internal reflection between two media.
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Brewster’s Angle Calculator
Find the incidence angle at which p-polarized reflection vanishes for a dielectric interface.
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Numerical Aperture Calculator
Calculate numerical aperture and acceptance angle for fibers and lenses.
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F-Number to NA Converter
Convert between lens f-number and numerical aperture.
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Thin Lens Equation Calculator
Solve for focal length, object distance, or image distance.
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Lens Thickness Calculator
Calculate center and edge thickness for spherical lens geometry.
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Lens Sag Calculator
Calculate the sagitta, or surface depth, of a spherical optical surface.
Spectroscopy & Light Absorption
Analyze Raman shifts, optical absorption, photon energy, and spectral units.
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Recently added
Raman Shift Calculator
Convert between Raman shift in cm⁻¹ and scattered wavelength using the excitation laser wavelength.
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Recently added
Beer–Lambert Law Calculator
Solve for absorbance, concentration, molar absorptivity, or path length, and convert absorbance to %T.
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Optical Density to Transmission
Convert optical density to percent transmission and attenuation.
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Photon Energy Calculator
Convert wavelength or frequency into photon energy in electronvolts and joules.
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Wavelength to Wavenumber
Convert vacuum wavelength in nanometers to wavenumber in cm⁻¹.
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Wavenumber to Wavelength
Convert spectral wavenumber in cm⁻¹ into wavelength in nanometers.
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Diffraction Grating Calculator
Calculate diffraction angles and orders for separating spectral wavelengths.
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Free Spectral Range Calculator
Calculate the frequency spacing between resonances in an etalon or optical cavity.
Fiber Optics & Photodiode Sensing
Estimate fiber behavior, link budgets, coupling loss, optical delay, and detector response.
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Mode Field Diameter Calculator
Calculate the effective mode diameter of a single-mode optical fiber.
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Fiber V-Number Calculator
Calculate normalized frequency and check single-mode guidance conditions.
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Fiber Splice Loss Calculator
Estimate coupling loss from mode-field mismatch and lateral offset.
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Fiber Optic Link Budget Calculator
Calculate total link loss, received optical power, and remaining system margin.
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Optical Fiber Delay Calculator
Calculate propagation time and latency through an optical fiber.
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Photodiode Responsivity & QE
Calculate photodiode responsivity and quantum efficiency.
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Optical Q-Factor Calculator
Relate optical resonator quality factor to cavity linewidth.
Electrical & Thermal Engineering
Calculate circuit parameters, driver voltage, thermistor response, and cooling loads.
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Ohm’s Law Calculator
Calculate voltage, current, resistance, and electrical power.
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RLC Circuit Calculator
Calculate resonance and impedance for resistor-inductor-capacitor circuits.
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Ohms to Volt-Ampere Calculator
Calculate apparent power for a resistive load using resistance and voltage or current.
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Driver Compliance Voltage
Estimate the voltage headroom needed to drive a laser diode.
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NTC Thermistor Calculator
Convert between temperature and resistance for an NTC thermistor.
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TEC Thermal Load Calculator
Estimate the heat-pumping load for a thermoelectric cooler.
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New
Shockley Diode Calculator
Calculate diode current, forward voltage, thermal voltage, and dynamic resistance.
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New
Zener Diode Calculator
Choose a series resistor and check Zener current, regulation, and power margin.
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New
Voltage Drop Calculator
Estimate cable voltage loss, load voltage, power loss, and required conductor size.
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Parallel Circuit Calculator
Calculate equivalent resistance, branch currents, total current, and resistor power.
Signal Converters & Units
Convert optical and electrical power, frequency, photometric quantities, and length units.
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dBm to Watts Converter
Convert logarithmic power in dBm to watts, milliwatts, and back.
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dBm to Voltage Converter
Convert dBm to RMS voltage for a specified system impedance.
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Frequency to Wavelength Converter
Convert frequency to wavelength and back using compatible units.
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Decibel to Percentage Converter
Convert logarithmic gain or loss in decibels to a linear percentage.
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Candela to Lumens Converter
Convert luminous intensity and luminous flux using the emission angle.
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Angstrom to Nanometer Converter
Convert atomic-scale lengths between angstroms and nanometers.
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Choose a tool for your calculation, then check its input units and model assumptions. These photonics and engineering calculators support everyday design work, laboratory measurements, and learning.