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Laser Beam Spot Size Calculator
Calculate Gaussian laser beam spot size at propagation distance
Instructions: Enter the laser wavelength ($\lambda$), beam waist radius ($w_0$), and propagation distance ($z$) to compute the spot radius and full diameter at distance $z$.
Optical Parameters
Calculation Results
⚠️ For laser physics and optics education reference only. Assumes fundamental Gaussian beam ($TEM_{00}$) mode.