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Gaussian Beams Calculator

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Axial Distance, $ z  \left[ \text{mm} \right] $:
Beam Waist, $ \omega_0  \left[ \text{mm} \right] $:
Wavelength, $ \lambda [ \large{\unicode[computer modern]{x03BC}} \text{m} ] $:

Half Beam Diameter, $ \omega \! \left( z \right) \left[ \text{mm} \right] $: --        

Radius of Curvature, $ R \! \left( z \right) \left[ \text{mm} \right] $: --        

Rayleigh Range, $ Z_R  \left[ \text{mm} \right] $: --        

Rayleigh Half Diameter, $ \omega_R \left[ \text{mm} \right] $: --        

Half Angle Divergence, $ \theta \left[ \text{mrad} \right] $: --        

Gaussian Beam Calculator

$$ z_R = \frac{\pi \omega_0 ^2}{\lambda} $$

$$ \omega \! \left( z \right) = \omega_0 \sqrt{1 + \left( \frac{z}{z_R} \right) ^2} $$

$$ Z_R = \frac{b}{2} $$

$$ \omega_R = \omega \! \left( Z_R \right) = \sqrt{2} \cdot \omega_0 $$

$$ R \! \left( z \right) = z \left[ 1 + \left( \frac{z_R}{z} \right)^2 \right] $$

$$ \theta = \frac{\lambda}{\pi \, \omega_0} $$
$$ \lambda $$ Wavelength
$$ Z_R $$ Rayleigh Range
$$ z $$ Axial Distance
$$ \omega \! \left( z \right) $$ Half Beam Diameter
$$ \omega_0 $$ Beam Waist
$$ b $$ Confocal Parameter
$$ \omega_R $$ Rayleigh Half Diameter
$$ R \! \left( z \right) $$ Radius of Curvature
$$ \theta $$ Half Angle Divergence
Notes:
  • Please use the American standard for number formatting rather than the European standard (i.e. for "two and a half," enter "2.5" rather than "2,5").
  • Results greater than 1,000,000 are rounded to infinity.

Description

Mathematically model beam propagation of Gaussian beam using simple geometric parameters. Calculator uses first-order approximations and assumes TEM00 mode to determine beam spot size in free space applications. Please note that results will vary based on beam quality and application conditions.

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 FAQ
I thought beam expanders increased a laser beam's size. How can that help me to get a smaller spot?
I thought beam expanders increased a laser beam's size. How can that help me to get a smaller spot?

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