Fixed Expansion Laser Beam Expanders

Beam Expanders & Shapers

Fixed beam expanders are ideal for increasing the waist size of collimated beams. They are based on a Galilean telescope design and are optimized to tolerate high power beams from systems such as ultrafast pulsed Nd:YAG lasers.


Beam expander, 10x mag, 355nm, fused silica


Beam expander, 10x mag, 532nm, fused silica


Beam expander, 10x mag,1064nm, fused silica


Beam expander, 3x mag, 355nm, fused silica


Beam expander, 3x mag,1064nm, fused silica

  • 3x, 5x, or 10x fixed expansion factor
  • Galilean optical design
  • Adjustable divergence
  • Transmission greater than 98%
  • AR coated for 1064 nm, 532 nm, and 355 nm


Galilean Optical Design

Our laser beam expanders provide a fixed expansion factor. We use either an air spaced two lens system or an achromat in order to minimize chromatic and spherical aberrations and reach diffraction limited performance. All our beam expanders have adjustable divergence. The design is Galilean, which means there is no internal focus and the system length is short compared to a Keplerian design. The lens and the mechanical parts are precisely designed to maximum pointing stability due to any rotational shifts which may occur from setup changes. All of the 355 nm beam expanders use fused silica to make them suitable for high power laser applications.




High Damage Threshold for Ultrafast Applications

All lenses are antireflection coated for their specific wavelengths yielding transmissions over 98%. For 1064 nm the damage threshold is 5.0 J/cm2 (1ns pulse at 50Hz). For 532 nm the damage threshold for expanders with fused silica on the input and optical glass on the output is 2.5 J/cm2 (1ns pulse at 50Hz). For 355nm the damage threshold is 1.0 J/cm2(1ns pulse at 50Hz).