Optics Calculator

This calculator will help you calculate the Beam diameter at focus, by inputting the $\frac{1}{e^2}$ spot diameter of the collimated Gaussian beam whose wavelength is $\lambda$ . Together with the diameter of lens $D$ and the focal length $f$ . In addition, by adding in the beam quality parameter $M^2$ into the formula will makes the output value more accurate.

${2w_0}$ = $\frac{4M^2 \lambda f }{\pi D}$

Input

Beam Diameter At Lens, $D$ :

Focal Length, $f$ :

Wavelength, $\lambda$ :

Beam Quality Factor, $M^2$ :

Output

Laser Beam Spot Size Calculator

${2w_0}$ = $\frac{4M^2 \lambda f }{\pi D}$

Beam Diameter At Lens, $D$ :

Focal Length, $f$ :

Wavelength, $\lambda$ :

Beam Quality Factor, $M^2$ :

Beam Diameter At Focus, $w_0$ :

Laser Beam Spot Size Calculator

2w0{2w_0}= 4M2λfπD\frac{4M^2 \lambda f }{\pi D}

Beam Diameter At Lens, DD:

Focal Length, ff:

Wavelength, λ\lambda:

Beam Quality Factor, M2M^2:

Beam Diameter At Focus, w0w_0:

${2w_0}$ = $\frac{4M^2 \lambda f }{\pi D}$

Beam Diameter At Lens, $D$ :

Focal Length, $f$ :

Wavelength, $\lambda$ :

Beam Quality Factor, $M^2$ :

Beam Diameter At Focus, $w_0$ :