Laser Beam Spot Size and Depth of Focus Calculator For reference only. Find the spot size and depth of focus for a given laser and lens configuration.Step 1 of 2 - Parameters50%Laser Wavelength (nm)*Enter the laser wavelength in nanometers. CO2 = 10600nm Fiber/YAG = 1064nm Red = 633nm Green = 532nm UV = 355nmLens Focal Length (mm)*Enter the lens focal length in millimeters.Laser Beam M² Factor*Please enter a number greater than or equal to 1.Enter the M² factor for the laser in question. This value should be on the specification sheet for your laser.Laser Beam Diameter (mm)*Enter the laser beam diameter value measured just before entering the focus lens. Approximate Spot Size (microns)This is the approximate spot size at the smallest point of a focusing laser beam with the above parameters. Beam Dia. = 1.27 * f * wavelength * M²/DDepth of Focus (mm)This is the approximate depth of focus for the given lens and laser configuration. DOF = 2.5 * wavelength * ((f/D)²)Depth of Focus (microns)This is the approximate depth of focus for the given lens and laser configuration. DOF = (2.5 * wavelength * ((f/D)²))*1000Contact UsLet us help you determine which laser you need for your application. You do not need to fill out this portion unless you wish to be contacted about your laser configuration. All calculated values are shown above.Name* First Last Company NameJob TitleEmail* Enter Email Confirm Email PhoneTerms and Conditions Acceptance* I agree to the terms and conditions This iframe contains the logic required to handle Ajax powered Gravity Forms.