Laser Focal Spot Calculator

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Use this calculator to get the size and location of your Gaussian laser beam waist at focus, as well as the Rayleigh range. Also try our Laser Focusability Calculator for a simpler calculator version.

Laser Parameters

Wavelength (nm): Required

Lens Focal Length (mm): Required

Gaussian Beam Propagation Factor:

Beam Divergence (Half angle) (mRed): Required

Beam Diameter at Aperture (d=2ω) (mm):

Beam Waist Diameter (d₀=2ω₀) (mm):

Distance from d₀ to Lens (mm): Required

Distance from d₀ and Exit Aperture (mm):

Distance from Exit Aperture to Lens (mm):

Adjust your parameters above and select 'Calculate' again to refine the values.

Calculation Results

zᵣRayleigh Length

s"Distance from lens to "new" Waist

d₀"New Beam Waist Diameter (After lens)

zᵣ"New Rayleigh Length

Notes:

Some of the input parameters are mutually dependent and the software will calculate them automatically when possible. A calculated parameter will be locked for editing. If you wish to unlock it, you must erase the value entered which caused it to be locked. Example: Fields A and B are mutually dependent. You enter a value in A and B is calculated and locked. You wish now to edit B. You must first delete A, upon which B will be erased an unlocked.
This calculator uses Sidney Self's equations for focusing spherical Gaussian beams.
Want to measure the actual beam size? Try a BeamTrack Power/Position/Size sensor, or a full-fledged beam profiler for a complete picture of your laser beam.