Physics

Laser Linewidth and Bandwidth Calculator

Convert a laser's wavelength linewidth to frequency bandwidth.

Calculated Output

Frequency bandwidth (Hz) 264,811,869.31

Bandwidth (GHz) 0.2648

Formula: Δν = c·Δλ ÷ λ²

Step-by-Step Breakdown

1. Values used:

2. Center wavelength = 1,064 nm

3. Linewidth = 1 pm

5. Frequency bandwidth = 264,811,869.31Hz

6. Bandwidth = 0.2648GHz

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The math behind it

Δν = c·Δλ ÷ λ². A narrower linewidth means a more coherent, single-color laser.

1064 nm with 1 pm linewidth → about 265 GHz.

Why does linewidth matter?

Narrow linewidth gives long coherence length, vital for interferometry and comms.