Laser Beam Divergence Calculator
Calculate laser beam divergence, spot size, and beam quality parameters
About this calculator
A Laser Beam Divergence Calculator determines how quickly a laser beam spreads as it travels through space, measuring the angular spread in milliradians or degrees. This tool is essential for optical engineers, researchers, and technicians working with laser systems who need to predict beam diameter at specific distances, calculate spot sizes for applications, and evaluate beam quality parameters like M² factor for system optimization and safety planning.
How to use
Enter your laser's initial beam diameter and wavelength, then specify the distance where you want to measure the beam. Input additional parameters like beam quality factor (M²) if known. The calculator will compute the beam divergence angle, final spot size, and other critical beam characteristics for your laser system design or analysis.
Frequently asked questions
What is laser beam divergence?
Beam divergence is the angular measure of how much a laser beam spreads as it travels away from its source, typically expressed in milliradians.
How does wavelength affect beam divergence?
Longer wavelengths produce greater divergence for the same beam diameter. Shorter wavelengths like blue light diverge less than infrared wavelengths.
What is the M² beam quality factor?
M² measures how close a real laser beam is to an ideal Gaussian beam. M²=1 is perfect; higher values indicate lower beam quality.