`w_0 = +sqrt( w ^2 - ( lambda * z )/pi)`

Enter a value for all fields

The Gausian Beam Waist calculator computes the beam waist for a Gausian Beam based on the beam half-width, distance on the axis and wavelength.

INSTRUCTIONS: Choose units and enter the following:

• (w) Beam half-width
• (z) Distance along the optical axis from the beam waist
• (`lambda`)  Beam Wavelength

Gausian Beam Waist (w₀): The calculator return the beam waist in nano-meters.  However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

This Gaussian Beam Waist equation^{Gaussian Beam Calculator.}

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Gaussian Beam Calculators

• Rayleigh range 
• Full-angular width (Θ)
• Beam half-width
• Beam Waist

1. ^ Hecht, Eugene. "Modern Optics: Lasers and Other Topics." Optics. Reading, MA: Addison-Wesley, 2002. 618. Print.