This calculator will help you calcaulate the radius of the beam waist after the laser passes through the convex lens

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$w$=$\frac{\lambda F}{ \pi w_0}$


Laser Wavelength $\lambda$; Focal Length of Lens $F$; Input Laser Radius $w_0$; Output Laser Wasit Radius $w$


Input
Laser Wavelength, $\lambda$:
mm
Focal Length of Lens, $F$:
mm

Input Laser Radius, $w_0$:
mm


Output
Output Laser Waist Radius, $w$:
mm