• Attenuation range for transmitted beam:
  • Typical: 0.1% - 98%
  • For 257 nm and 266 nm: 1% - 94%
• Attenuation range for reflected beam:
  • Typical: 2% - 99.9%
  • For 257 nm and 266 nm: 4% - 99%
• Extinction ratio: >1:1000
• Clear aperture:
  • 990-0077 - ⌀17 mm
  • 990-0078 - ⌀22 mm

This manual variable attenuator series is designed to continuously attenuate linearly polarized laser beams. They feature precision opto-mechanics and high-LIDT optical components incorporated in a compact housing to ensure stable and reliable performance.

Attenuators are based on a Brewster-type thin film polarizer fixed at 56° and a quartz waveplate. The polarizer's angle of incidence can be manually adjusted to achieve the best contrast or to manipulate the direction of the reflected s-polarized beam. The waveplate is housed in a 360° continuous rotation mount, which can be manually rotated to control the output power of the transmitted and reflected beams.

The intensity of either beam or their intensity ration can be controlled over a wide dynamic range without alteration of other beam parameters. Pure p-polarization could be selected for maximum transmission, or pure s-polarization for maximum reflection.

The s-polarization exit port can be blocked with a removable low-power dumper which absorbs laser power up to 5 W. External beam dumps are recommended for high-power applications.

• Air-cooled beam dump 990-0800 for beams up to 50 W
• Water-cooled beam dump 990-0820 for beams up to 1 kW