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 NumberRequest a Quote
400300-390415-610SO-SP-FIL-EE12C-0001Request a Quote
425300-415440-635SO-SP-FIL-EE12C-0002Request a Quote
450300-440465-660SO-SP-FIL-EE12C-0003Request a Quote
475300-465490-685SO-SP-FIL-EE12C-0004Request a Quote
500300-490515-715SO-SP-FIL-EE12C-0005Request a Quote
525300-515540-740SO-SP-FIL-EE12C-0006Request a Quote
550350-535565-825SO-SP-FIL-EE12C-0007Request a Quote
575350-560590-850SO-SP-FIL-EE12C-0008Request a Quote
600350-585615-900SO-SP-FIL-EE12C-0009Request a Quote
625350-610640-925SO-SP-FIL-EE12C-0010Request a Quote
650350-635665-960SO-SP-FIL-EE12C-0011Request a Quote
675350-660690-1000SO-SP-FIL-EE12C-0012Request a Quote
700400-685715-1050SO-SP-FIL-EE12C-0013Request a Quote
725400-710740-1090SO-SP-FIL-EE12C-0014Request a Quote
750400-735775-1125SO-SP-FIL-EE12C-0015Request a Quote
775400-760795-1155SO-SP-FIL-EE12C-0016Request a Quote
800400-785825-1190SO-SP-FIL-EE12C-0017Request a Quote
825400-810850-1190SO-SP-FIL-EE12C-0018Request a Quote
850400-835880-1190SO-SP-FIL-EE12C-0019Request a Quote
875425-860905-1220SO-SP-FIL-EE12C-0020Request a Quote
900425-885930-1250SO-SP-FIL-EE12C-0021Request a Quote
925445-910955-1290SO-SP-FIL-EE12C-0022Request a Quote
950450-935980-1325SO-SP-FIL-EE12C-0023Request a Quote
975465-9601005-1365SO-SP-FIL-EE12C-0024Request a Quote
1000465-9851035-1400SO-SP-FIL-EE12C-0025Request a Quote
1025490-10101060-1430SO-SP-FIL-EE12C-0026Request a Quote
1050495-10351085-1460SO-SP-FIL-EE12C-0027Request a Quote
1075505-10601110-1495SO-SP-FIL-EE12C-0028Request a Quote
1100510-10851140-1530SO-SP-FIL-EE12C-0029Request 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 NumberRequest a Quote
400*250-385420-485SO-SP-FIL-EE12C-0030Request a Quote
450*250-430470-545SO-SP-FIL-EE12C-0031Request a Quote
500*250-480520-610SO-SP-FIL-EE12C-0032Request a Quote
550*250-530575-665SO-SP-FIL-EE12C-0033Request a Quote
600400-580625-795SO-SP-FIL-EE12C-0034Request a Quote
650400-630675-850SO-SP-FIL-EE12C-0035Request a Quote
700400-680725-900SO-SP-FIL-EE12C-0036Request a Quote
750400-725800-990SO-SP-FIL-EE12C-0037Request a Quote
800400-775850-1050SO-SP-FIL-EE12C-0038Request a Quote
850400-820910-1110SO-SP-FIL-EE12C-0039Request a Quote
900425-865960-1170SO-SP-FIL-EE12C-0040Request a Quote
950450-9101025-1235SO-SP-FIL-EE12C-0041Request a Quote
1000465-9401085-1305SO-SP-FIL-EE12C-0042Request a Quote
1050485-10001130-1370SO-SP-FIL-EE12C-0043Request a Quote
1100510-10501180-1440SO-SP-FIL-EE12C-0044Request 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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