Dyna-Film Bandpass Filters

Dyna-Film High Transmission Bandpass Filters are custom designed and manufactured to optimize spectral performance, provide exceptional environmental durability, and minimize the cost of optical bandpass filtering required for absorbance, reflectance, and transmissive applications. Bridging the gap between traditional bandpass filters and expensive budget busting sputtered films, we have combined best practices learned over the past 40 years as a leading manufacturer of catalog and OEM optical filters, with today’s most advanced optical materials, construction methods, and large volume manufacturing capabilities. Dyna-Film optical filters benefit the many instrument manufacturers which require the following critical spectral and physical performance characteristics:

High Transmission

Dyna-Film Interference Filter Capability Overview Our proprietary engineering design and manufacturing processes, guided by over 40 years of manufacturing experience and today’s best materials and technology compatibility, has enabled the new Dyna-Film high transmission optical bandpass filters. The following three examples demonstrate typical performance improvement when compared to standard optical filters.

Deep Blocking

Dyna-Film Optical Bandpass Filters are constructed having out of band spectral rejection of 1 x 10-4 (4 OD) average over the common 200 nm – 1200 nm spectral band. Opportunities may exist for additional performance enhancement or cost savings if your OEM application does not require this level or spectral range of blocking.

Great Environmental Durability

Both Standard and Dyna-Film Optical Bandpass Filters were tested in an environmental test chamber following the MIL-STD-810E (Procedure III) protocol. There is a large opinion that each day in the test chamber corresponds to approximately 1 year of operation in a relatively high temperature and humidity cycling atmosphere. Filters were exposed for 7 days and then checked for delamination, visible deterioration, and spectroscopic failure. Then, alternating days of visual inspection only and full inspection were performed.

While the standard class of filters exhibited signs of delamination at day 7, the Dyna-Film Optical Bandpass Filters survived beyond 15 cycles defined by the test procedure.

Performance Guide

Center Wavelengths 340 – 1000 nm
FWHM (50% bandwidths) 3 – 40 nm
Blocking Density (Average) 1×10- 4, OD 4
Blocking Range 200 – 1200 nm
Minimum Peak Transmission CWL 340 – 450 nm: 45%
CWL 451 – 905 nm: 75%
Angle of Incidence 0 degrees
Effective Refractive Index (nominal) 1.45 for wavelengths 340 – 460 nm
2.05 for wavelengths 470 – 1100 nm
Specification Temperature 23° C
Survival Temperature Range -50° C to +50° C (CWL’s < 400 nm)
-50° C to +70° C (CWL’s > 400 nm)
(Not designed for high power lasers)
 Thermal Shift  0.015 nm/°C to 0.025 nm/°C (340 – 1100 nm) Typical
 Optical Quality Commercial
Surface Quality  80/50
Humidity Resistance  MIL-810-810E, Method 507.3, Procedure III, >10 cycles
Ring Material  Aluminum, Black Anodized
Ring Marking  Per Specifications
 Cleaning Method Gentle, non-abrasive method using isopropyl alcohol or acetone


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