Shanghai Optics

Shortpass Filters

A shortpass filter is a type of edge filter designed to pass wavelengths of light shorter than a given cut off wavelength while blocking long wavelengths. At Shanghai Optics we manufacture high quality shortpass filters for a wide variety of applications, from medical industry to research to defense. Our filters feature high transmission. They can be used for ultraviolet visible or infrared applications. These filters are designed to perform reliably under a wide range of conditions, and are durable enough to withstand normal handling and cleaning.

High Quality Dielectric Shortpass Filters

SubstrateUV Fused Silica
Transmitted Wavefrontλ/4@633nm
Parallelism<30 arcsec
Surface Quality40-20
Diameter Tolerance+0.0/-0.1mm
Thickness2mm±0.2mm
Cut-Off Tolerance±1%
TransmissionTavg>90%
BlockingOD4
Edge Slope<1%
Clear Aperture>90%
Angle of Incidence0°
Cut-Off Wavelength (nm) Transmission Region (nm) Blocking (nm) Part Number Request a Quote
400 300-390 415-610 SO-SP-FIL-EE12C-0001 Request a Quote
425 300-415 440-635 SO-SP-FIL-EE12C-0002 Request a Quote
450 300-440 465-660 SO-SP-FIL-EE12C-0003 Request a Quote
475 300-465 490-685 SO-SP-FIL-EE12C-0004 Request a Quote
500 300-490 515-715 SO-SP-FIL-EE12C-0005 Request a Quote
525 300-515 540-740 SO-SP-FIL-EE12C-0006 Request a Quote
550 350-535 565-825 SO-SP-FIL-EE12C-0007 Request a Quote
575 350-560 590-850 SO-SP-FIL-EE12C-0008 Request a Quote
600 350-585 615-900 SO-SP-FIL-EE12C-0009 Request a Quote
625 350-610 640-925 SO-SP-FIL-EE12C-0010 Request a Quote
650 350-635 665-960 SO-SP-FIL-EE12C-0011 Request a Quote
675 350-660 690-1000 SO-SP-FIL-EE12C-0012 Request a Quote
700 400-685 715-1050 SO-SP-FIL-EE12C-0013 Request a Quote
725 400-710 740-1090 SO-SP-FIL-EE12C-0014 Request a Quote
750 400-735 775-1125 SO-SP-FIL-EE12C-0015 Request a Quote
775 400-760 795-1155 SO-SP-FIL-EE12C-0016 Request a Quote
800 400-785 825-1190 SO-SP-FIL-EE12C-0017 Request a Quote
825 400-810 850-1190 SO-SP-FIL-EE12C-0018 Request a Quote
850 400-835 880-1190 SO-SP-FIL-EE12C-0019 Request a Quote
875 425-860 905-1220 SO-SP-FIL-EE12C-0020 Request a Quote
900 425-885 930-1250 SO-SP-FIL-EE12C-0021 Request a Quote
925 445-910 955-1290 SO-SP-FIL-EE12C-0022 Request a Quote
950 450-935 980-1325 SO-SP-FIL-EE12C-0023 Request a Quote
975 465-960 1005-1365 SO-SP-FIL-EE12C-0024 Request a Quote
1000 465-985 1035-1400 SO-SP-FIL-EE12C-0025 Request a Quote
1025 490-1010 1060-1430 SO-SP-FIL-EE12C-0026 Request a Quote
1050 495-1035 1085-1460 SO-SP-FIL-EE12C-0027 Request a Quote
1075 505-1060 1110-1495 SO-SP-FIL-EE12C-0028 Request a Quote
1100 510-1085 1140-1530 SO-SP-FIL-EE12C-0029 Request a Quote

Economic Dielectric Shortpass Filters

SubstrateOptical-Grade Float Glass (B270)
Transmitted Wavefrontλ/4@633nm
Parallelism<30 arcsec
Surface Quality40-20
Diameter Tolerance+0.0/-0.1mm
Thickness2mm±0.2mm
Cut-Off Tolerance±2%
TransmissionTavg>85%
BlockingOD2
Edge Slope<3%
Clear Aperture>90%
Angle of Incidence0°
Cut-Off Wavelength (nm) Transmission Region (nm) Blocking (nm) Part Number Request a Quote
400* 250-385 420-485 SO-SP-FIL-EE12C-0030 Request a Quote
450* 250-430 470-545 SO-SP-FIL-EE12C-0031 Request a Quote
500* 250-480 520-610 SO-SP-FIL-EE12C-0032 Request a Quote
550* 250-530 575-665 SO-SP-FIL-EE12C-0033 Request a Quote
600 400-580 625-795 SO-SP-FIL-EE12C-0034 Request a Quote
650 400-630 675-850 SO-SP-FIL-EE12C-0035 Request a Quote
700 400-680 725-900 SO-SP-FIL-EE12C-0036 Request a Quote
750 400-725 800-990 SO-SP-FIL-EE12C-0037 Request a Quote
800 400-775 850-1050 SO-SP-FIL-EE12C-0038 Request a Quote
850 400-820 910-1110 SO-SP-FIL-EE12C-0039 Request a Quote
900 425-865 960-1170 SO-SP-FIL-EE12C-0040 Request a Quote
950 450-910 1025-1235 SO-SP-FIL-EE12C-0041 Request a Quote
1000 465-940 1085-1305 SO-SP-FIL-EE12C-0042 Request a Quote
1050 485-1000 1130-1370 SO-SP-FIL-EE12C-0043 Request a Quote
1100 510-1050 1180-1440 SO-SP-FIL-EE12C-0044 Request a Quote
*Substrate Material: UV Fused Silica
Please note that prices are subject to change without notice. For the most up-to-date pricing, please contact our office. Shipping costs will be calculated and added to your final order total.

Shortpass Filters

Shortpass filters are optical edge filters designed to transmit shorter wavelengths while blocking longer wavelengths above a specified cut-off wavelength. These filters are commonly used in fluorescence microscopy, Raman spectroscopy, biomedical imaging, semiconductor inspection, and laser-based optical systems.

Shanghai Optics manufactures high-transmission shortpass optical filters for ultraviolet (UV), visible, and infrared (IR) imaging applications. Available configurations include standard and custom shortpass filters with steep edge transitions, durable coatings, and high optical density blocking performance.

Applications include:

Understanding Shortpass Filters

Shortpass filters are optical edge filters that transmit wavelengths shorter than a defined cut-off wavelength while rejecting longer wavelengths. The cut-off wavelength is typically defined at the 50% transmission point and is one of the most important specifications when selecting a shortpass optical filter.

Well-designed shortpass filters provide:

  • high transmission efficiency
  • steep spectral transitions
  • strong out-of-band blocking
  • minimal wavefront distortion

These characteristics are important for fluorescence imaging, spectroscopy, and precision optical systems.

 

A well designed shortpass filter will have a steep cut-off, and above the cut-off wavelength light will be effectively blocked. Almost 100% of light shorter than the cut-off wavelength will be transmitted without change. These ranges are referred to as the rejection and transmission ranges of the shortpass filter.

 

How to Choose a Shortpass Filter

When selecting a shortpass optical filter, important specifications include:
  • Cut-off Wavelength: The cut-off wavelength determines where transmission transitions into blocking.
  • Optical Density (OD): Higher optical density provides stronger rejection of unwanted wavelengths.
  • Transmission Efficiency: High transmission improves optical throughput and imaging performance.
  • Angle of Incidence: Changing the angle of incidence shifts the spectral response of the filter.
  • Coating Durability: Hard-coated filters provide improved environmental durability and thermal stability.

 

Mounting Your Shortpass Filter

Shortpass filters can operate in either orientation, but the coated side is typically positioned toward the light source to reduce thermal stress and improve long-term coating stability.

The cut-off wavelength can also shift depending on the angle of incidence. This effect is sometimes used to fine-tune spectral performance in optical systems.

 

Applications of Shortpass Filters

Shortpass filters are widely used in:

  • Fluorescence Microscopy
  • Raman Spectroscopy
  • Biomedical Imaging
  • Laser Systems
  • Hot Mirror Applications
  • Semiconductor Inspection
  • Optical Metrology
  • Scientific Instrumentation

Shortpass filters are commonly combined with longpass filters to create bandpass filtering systems for precise wavelength isolation.

 

At Shanghai Optics we carry a wide range of standard and hard coated shortpass filters in stock, individually and in kits. Our experienced engineering and design team is also available to help you design the ideal filter arrangement for your application. Please contact us to receive a listing of in-stock shortpass filters and to discuss custom options.

 

Frequently Asked Questions

What is a shortpass filter?

A shortpass filter is an optical edge filter that transmits shorter wavelengths while blocking longer wavelengths above a specified cut-off wavelength.

What is the difference between shortpass and longpass filters?

Shortpass filters transmit shorter wavelengths, while longpass filters transmit longer wavelengths.

What are shortpass filters used for?

Shortpass filters are commonly used in fluorescence microscopy, spectroscopy, laser systems, biomedical imaging, and semiconductor inspection.

What is cut-off wavelength?

The cut-off wavelength is the wavelength where filter transmission reaches 50%.

Can shortpass filters be customized?

Yes. Shortpass optical filters can be customized for cut-off wavelength, coating type, optical density, substrate material, and transmission requirements.

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