• Zero Order Waveplate
• AR-Coating Performance: R_avg <0.5% per surface
• Clear Aperture: Ø10 mm
• Post Mountable (8-32 and M4 Adapters Included)
• Custom Wavelength Versions Available

Thorlabs’ Variable Beamsplitter and Attenuator allows the user to continuously vary the transmitted intensity of a linearly polarized beam of light. The attenuator accomplishes this by using a zero-order wave plate in a rotation mount and a polarizing beamsplitter cube. This combination allows it to achieve split ratios of 1:99 to 99:1 for P:S polarized light. Applications include holography and interferometry.

The variable Beamsplitter and Attenuator is aligned to be easily incorporated into systems using Thorlabs’ Sm1 series of lens tubes and 30 mm cage systems. The attenuator uses a half-wave plate mounted in a compact rotation mount design that will not interfere with a cube connector (Cm1-CC) or cage rods. This allows wave plate rotation for continuous adjustment to the attenuation/split ratio.

• Beamsplitter
• Extinction Quality: Tp/Ts >1000:1
• Surface Quality: 40-20 Scratch-Dig
• Transmitted Wavefront Error
• Reflectance: <0.5% per Surface (1200-1600 nm)
• Waveplate
• Reflectance Accuracy: λ/300 (Typical)
• Transmitted Wavefront Error: λ/8 @ 633 nm
• Surface Quality: 20-10 Scratch-Dig
• Reflectance: <1.00% @ 1550 nm
• Assembly
• Transmitted Beam Deviation: <10 arcmin
• Reflected Beam Deviation: 90° ± 30 arcmin