Lake Shore’s line of mid- and far-infrared (IR) long-pass filters is based on porous silicon technology. The unique patent pending all-silicon design has excellent thermal and mechanical properties — even at cryogenic and elevated temperatures, and will not delaminate under harsh conditions. Long-pass IR filters block short wavelength radiation to improve signal-to-noise in mid- and far-IR applications, including FTIR spectroscopy, astronomy, IR detector research, and terahertz imaging.

 

IR filters from Lake Shore have a wide and flat spectral response to 200 µm and above with rejection edge wavelengths from 1 µm to 50 µm. These scattering-type IR filters are based on novel electrochemical etching of silicon. The random macroporous silicon scatters the short waves within the blocking range of the filter. Unique design and fabrication processes control the filter rejection edge. Rejection band blocking extends to 100 nm with optical densities greater than 2. Standard and custom designs ranging in diameter from 0.5 to 4 inches are available.

As an additional service, spectral measurements can be performed at 4.2 K and 77 K. Spectral measurements at room temperature are included.

• Long Wave Pass Filters
• Scattering Design
• Cleaning and Handling of Filters
• Spectral Scans
• THz & IR Band Pass Filters