Beam Expander Calculator

Popular Lens Mirror Prism Filter Dispersion Polarization Coating Optical Window

Tool Description

A beam expander enlarges the laser beam diameter by a magnification factor while reducing the divergence angle. This tool supports both Keplerian and Galilean configurations, calculating lens focal lengths, spacing, and output beam parameters.

Input Parameters

Expander Type

Magnification (M×)

Input Beam Diameter (mm)

Wavelength (nm)

Lens 1 Focal Length f₁ (mm)

Input Divergence (mrad)

Results

Lens 2 Focal Length f₂

—

Lens Spacing d

—

Output Beam Diameter

—

Output Divergence

—

Rayleigh Range (Zr)

—

Total System Length

—

Optical Path Diagram

Core Formulas

Magnification

M = f₂ / f₁

Lens Spacing (Keplerian)

d = f₁ + f₂

Lens Spacing (Galilean)

d = f₂ − |f₁|（f₁ < 0）

Output Divergence

θ_out = θ_in / M

In StockStandard items, fast delivery

Custom MadeTailored specs, precise fit

One-StopFull range, single source

Quality AssuredStrict QC, full traceability

Resources

Tool Description

Input Parameters

Results

Optical Path Diagram

Core Formulas

Cookie Preferences