Our short and long-wave pass filters have a steep transition between the region of transmission and reflection — much steeper than colored glass filters. Both the short and long-wave pass filters have out-of-band rejection ³OD 3 to X-ray (for LWP) and to 1200nm (for SWP). Typical transmission is ³80% for long-wave pass and ³65% for short-wave pass filters. These filters are available individually and in sets.
●Product Detail
These short and long-wave pass filters have a very steep transition between the region of transmission and reflection — much steeper than colored glass filters. They have a hard, dielectric filter coating using interference effects rather than absorption to isolate the spectral bands. Unlike colored glass filters, the center wavelength will shift to shorter wavelengths with an increase in angle of incidence. This can be useful for tilt tuning these filters to your exact wavelength. A custom bandpass filter with excellent performance can be constructed using a combination of a short-wave pass and a long-wave pass filter.
Giai long and short-wave pass filters are manufactured using methods and materials designed to deliver the highest spectral performance while providing a robust construction capable of withstanding variable climatic conditions. Transition slopes of £6% are established by a dielectric thin-film coating. This coating is optimized to provide a wide band of high average transmission. Blocking to X-ray on long wave pass filters, and to 1100 nm on short wave pass filters, is accomplished by a combination of reflection from dielectric thin-film coatings, and absorption from filter glasses.
In addition to using these filters in the traditional manner, they can be used to create custom bandpass filters with excellent performance by using a combination of a short-wave pass and a long-wave pass filter in series.
●Specifications
Minimum Active Area
20.2 mm
Surface Quality
80-50 scratch-dig; F/F per MIL-F-48616
Diameter
25.4 +0/-0.5 mm
Thickness
2.0 to 7.6 mm
Angle of Incidence
Normal
Tav Minimum Average Transmittance
Short Wave Pass: 65%
Long Wave Pass: 80%
Rejection (spectral)
Short Wave Pass: 1.2lc to 1100 nm, =0.1% T or =10-3
Long Wave Pass: X-Ray to 0.85 lc, =0.1% T or =10-3
Slope*
£6% where slope%=100% (l80%Tpk-l5%Tabs)/l5%Tabs
Effective Index of Refraction ne
1.7
Wavelength Shift with Temperature
Short Wave Pass: 0.02 nm/°C
Long Wave Pass: 0.025 nm/°C
Humidity
Per MIL-STD-810E, Method 507.3, Procedure III Modified to 7 cycles
Temperature Range
-50°C to + 100 °C
Cleaning
Non-abrasive method, acetone or isopropyl alcohol
on lens tissue recommended
Short-Wave Pass Filters
Model
lc Cut-On Wavelength
@ 50% of Tpk (nm)
Minimum Spectral range of
Transmittance l1 to l2(nm)
10SWF-450-B
450 ± 5
415–440
10SWF-500-B
500 ± 5
415–490
10SWF-550-B
550 ± 5
415–540
10SWF-600-B
600 ± 5
415–590
10SWF-650-B
650 ± 5
415–640
10SWF-700-B
700 ± 6
440–685
10SWF-750-B
750 ± 6
475–735
10SWF-800-B
800 ± 6
475–785
10SWF-850-B
850 ± 6
475–835
10SWF-900-B
900 ± 7
475–880
10SWF-950-B
950 ± 7
475–930
10SWF-1000-B
1000 ± 7
475–980
Long-Wave Pass Filters
Model
lc Cut-On Wavelength
@ 50% of Tpk (nm)
Minimum Spectral range of
Transmittance l1 to l2(nm)
