This calcaulator will help you converts a spectral bandwidth expressed in wavelength Δλ at a certain central wavelength λ0to frequency domain.

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C=3*10$^8$

$V_0$= $\frac{C}{\lambda_0}$

$V_{start}$ = $\frac{C}{\lambda_0 + \lambda/2}$
$V_{stop}$ = $\frac{C}{\lambda_0 - \lambda/2}$

$\triangle V$= $V_{stop}$ - $V_{start}$


Wavelength Bandwidth $\lambda$; Center Wavelength $\lambda_0$; Center Frequency $V_0$; Frequency Bandwidith $\triangle V$;

Input
Center Wavelength, $\lambda_0$:
nm
Wavelength Bandwidth: $\lambda$
nm



Output
Center Frequency, $V_0$:
THz
Frequency Bandwidith, $\triangle V$:
THz

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