Filters for extending the blocking of our Continuously Variable Filters
Optical Blocking Filters
Delta Optical Thin Film has created a range of Homogeneous Blocking Filters, designed to enhance the out-of-band blocking of some of our Continuously Variable Filters. These out-of-band blocking filters offer high transmission in a wide wavelength range while blocking other wavelengths in the complete silicon sensor wavelength range (300 – 1100 nm). The out-of-band blocking filters are designed to be switched in and out of the beam at certain wavelengths as shown on the figure below.
A Continuously Variable Long-Wave Pass (CVLWP) and a Continuously Variable Short-Wave Pass (CVSWP) filter pair is used to create a tunable filter as described on our product page about Continuously Variable Edge filters.
The two blocking filters on the figure are are essentially wide-bandpass filters that transmit nearly 100% in the passband and reject typically OD5-6 outside the passband. The blocking filters can be slided into the beam path one at a time depending on the wavelength range in use.
The table below lists a number of out-of-band blocking filters that we have manufactured. If none of the examples match your specific needs we are happy to discuss a customized filter for you.
Product specifications
| λcenter (nm) | FWHM (nm) | Tpeak (%) | Product number | Max size | Data sheet |
|---|---|---|---|---|---|
| 480 | 220 | 93 | LF104551 | 80 mm x 55 mm x 1 mm |  |
| 550 | 100 | 92 | LF101158 | Round diameter 25 mm x 2 mm | |
| 550 | 190 | 90 | LF103000 | Round diameter 25 mm x 2 mm | |
| 555 | 200 | 90 | LF102851 | Round diameter 25 mm x 2 mm | |
| 558 | 295 | 94 | LF104552 | 80 mm x 55 mm x 1 mm | |
| 670 | 360 | 95 | LF104553 | 80 mm x 55 mm x 1 mm | |
| 778 | 365 | 90 | LF103001 | Round diameter 25 mm x 2 mm | |
| 827 | 425 | 95 | LF104554 | 80 mm x 55 mm x 1 mm | |
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