• Short and Long-Wave Pass Edge Filters

    Short and Long-Wave Pass Edge Filters


    ●High rejection/transmission



    ●Excellent temperature stability


    ●Cut-on/Cut-off wavelengths available from 400 nm to 1000 nm


    ●Blocked to X-ray (LWP) and 1200 nm (SWP)

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    ●Product Description

    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)
     10LWF-400-B  400 ± 5  410–1200
     10LWF-450-B  450 ± 5  460–1200
     10LWF-500-B  500 ± 5  510–1200
     10LWF-550-B  550 ± 5  560–1200
     10LWF-600-B  600 ± 5  610–1200
     10LWF-650-B  650 ± 5  660–1200
     10LWF-700-B  700 ± 6  715–1200
     10LWF-750-B  750 ± 6  765–1200
     10LWF-800-B  800 ± 6  815–1200
     10LWF-850-B  850 ± 6  865–1200
     10LWF-900-B  900 ± 7  920–1200
     10LWF-950-B  950 ± 7  970–1200

     

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