Use this semiconductor calculation for first-order device, material, fabrication, interconnect, packaging, or reliability estimates when every coefficient and unit convention is known.

Differential quantum efficiency (%)

Required number in %. Differential quantum efficiency above threshold.

Photon energy (eV)

Required number in eV. Photon energy of the emitted light.

The cited overview of Laser diode supplies background for the terminology and domain context used by this tool.^[1]

Compute laser slope efficiency in watts per ampere from differential quantum efficiency and photon energy, where W/A numerically equals the efficiency fraction times photon energy in electronvolts. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Slope efficiency (W/A)

Returned number in W/A. Increase in optical output power per increase in current.

• Material composition, geometry, process history, temperature, electric field, bias, interfaces, parasitics, and fitted parameter ranges can invalidate a compact semiconductor model.
• Differential quantum efficiency must be at least 0.
• Differential quantum efficiency must be no greater than 100.
• Photon energy must be at least 5e-324.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Compare the estimate with measured process data, current device documentation, and a higher-fidelity circuit, field, thermal, quantum, or TCAD model when the decision requires it.

• Photon Lifetime Calculator

  Compute the cavity photon lifetime from refractive index and total distributed loss using tau equals n over c times alpha.

• Photodiode Responsivity Calculator

  Compute photodiode responsivity from quantum efficiency and wavelength using R equals eta times lambda over 1240.

• Quantum Cascade Laser Wavelength

  Photon wavelength of a quantum-cascade laser from intersubband transition energy in electronvolts.