# Laser Focal Spot Size Calculator

Use this calculator to get the size and location of your Gaussian laser beam waist at focus, as well as the Rayleigh range.

Also try our Laser Focusability Calculator for a simpler calculator version.

Notes:

- Some of the input parameters are mutually dependent and the software will calculate them automatically when possible. A calculated parameter will be locked for editing. If you wish to unlock it, you must erase the value entered which caused it to be locked. Example: Fields A and B are mutually dependent. You enter a value in A and B is calculated and locked. You wish now to edit B. You must first delete A, upon which B will be erased an unlocked.
- This calculator uses Sidney Self’s equations for focusing spherical Gaussian beams.
- Want to measure the actual beam size? Try a BeamTrack Power/Position/Size sensor, or a full-fledged beam profiler for a complete picture of your laser beam.

#### Calclated Results

## Read more about this

## Laser Calculators

### Laser Focusability Calculator

For a collimated beam, the diffraction-limited focal spot size of a laser beam depends on its wavelength

### Temperature Rise Calculator

Calculator for Temperature Rise in Uncooled Laser Power Sensors

### Laser Focal Spot Size Calculator

Use this calculator to get the size and location of your Gaussian laser beam waist at focus, as well as the Rayleigh range. Also try our Laser Focusability Calculator for a simpler calculator version. Notes:

### Laser Power Through Aperture Calculator (Gaussian Beam)

Gaussian laser beams have power intensities in the shape of a bell curve (Gaussian).

### Laser Peak Power Calculator

Use this calculator to determine the peak power of your laser beam.

### Power Density Calculator

What is this calculator for? Use this calculator to determine the power density and/or fluence (energy density) of your laser beam.