Features

• Longpass Dichroic Mirror with Minimal Absorption Losses
• 25 mm x 36 mm Filter
• Hard Coating Allows Easy Handling and Cleaning
• Resistant to Damage from UV Light and Chemicals

A dichroic mirror/beamsplitter functions as a 50:50 beamsplitter at its design wavelength, known as the cutoff wavelength. Thorlabs' DMLP900R Longpass Dichroic Mirror/Beamsplitter has a 900 nm cutoff wavelength and provides >90% average reflection from 400 - 872 nm and >90% average transmission from 932 - 1300 nm. It has a 25 mm x 36 mm size and is designed for use at a 45° incident angle.

Our dichroic mirrors/beamsplitters feature a dichroic coating on one surface and an antireflection coating on the opposing surface. The surface with the dichroic coating is engraved with the part number.

Dichroic mirrors/beamsplitters can be used to combine a beam that has a wavelength (or wavelength range) shorter than the design wavelength with a beam that has a wavelength (or wavelength range) longer than the design wavelength while minimizing intensity losses. Alternatively, spatially overlapping beams of different colors can be split with a single optic. This feature is commonly used in fluorescence microscopy to prevent light of the excitation wavelength from reaching the imaging detector.

Specifications

• Cutoff Wavelength: 900 nm
• Reflection Band: 400 - 872 nm
• Transmission Band: 932 - 1300 nm
• AR Coating Range: 932 - 1300 nm
• Damage Threshold at 532 nm: 1.21 J/cm² (10 Hz, 10 ns, Ø250 µm)
• Damage Threshold at 1064 nm: 6.78 J/cm² (10 Hz, 12 ns, Ø250 µm)

Applications

• Fluorescence Microscopy
• Splitting or Combining Two Beams of Different Wavelengths
• Filtering of Spectral Components
• Laser Applications that Require Minimal Wavefront Distortion