Wavelength bandwidth converter



About this calculator

This calculator converts a spectral bandwidth expressed in wavelength Δλ\Delta\lambda at a certain central wavelength λ0\lambda_0 to frequency domain. This calculator does not use the common linear approximation but computes the start and stop frequencies directly as follows:

νstart=cλ0+λ/2\nu_{start} = \dfrac{c}{\lambda_0 + \lambda / 2}
νstop=cλ0λ/2\nu_{stop} = \dfrac{c}{\lambda_0 - \lambda / 2}

and the frequency bandwidth is then directly

Δν=νstopνstart\Delta\nu = \nu_{stop} - \nu_{start}

The center frequency is calculated from the center wavelength as

ν0=cλ0\nu_{0} = \dfrac{c}{\lambda_0}