Longpass Filter (LPF)

Longpass Filters (LPF) - Superior Long Wavelength Transmission

Longpass filters transmit longer wavelengths while effectively blocking shorter wavelengths, providing essential spectral control for applications requiring the removal of unwanted short wavelength components.

Product Price CUT-ON
LP360 Longpass Filter (T>90%@370-1200nm, OD3@200-350nm) $50.00 360nm
LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm) $50.00 370nm
LP390 Longpass Filter (T>85%@400-2000nm, OD5@200-380nm) $50.00 390nm
LP400 Longpass Filter (T>85%@410-1100nm, OD5@200-390nm) $50.00 400nm
LP405 Longpass Filter (T>90%@415-1200nm, OD3@200-395nm) $50.00 405nm
LP410 Longpass Filter (T>85%@420-1100nm, OD5@200-400nm) $50.00 410nm
LP420 Longpass Filter (T>85%@430-1100nm, OD5@200-410nm) $50.00 420nm
LP425 Longpass Filter (T>90%@435-1100nm, OD6@200-420nm) $50.00 425nm
LP430 Longpass Filter (T>90%@435-1200nm, OD3@200-420nm) $50.00 430nm
LP435 Longpass Filter (T>90%@440-1800nm, OD4@200-430nm) $50.00 435nm
LP440 Longpass Filter (T>95%@445-1200nm, OD6@200-435nm) $50.00 440nm
LP450 Longpass Filter (T>95%@455-1200nm, OD4@200-445nm) $50.00 450nm
LP480 Longpass Filter (T>90%@490-1100nm, OD2@200-470nm) $50.00 480nm
LP500 Longpass Filter (T>85%@510-1200nm, OD5@200-490nm) $50.00 500nm
LP510 Longpass Filter (T>85%@520-1200nm, OD5@200-500nm) $50.00 510nm
LP520 Longpass Filter (T>90%@525-1200nm, OD6@200-510nm) $50.00 520nm
LP530 Longpass Filter (T>90%@540-1200nm, OD5@200-520nm) $50.00 530nm
LP540 Longpass Filter (T>95%@550-1200nm, OD5@200-530nm) $50.00 540nm
LP550 Longpass Filter (T>90%@560-1200nm, OD3@200-540nm) $50.00 550nm
LP575 Longpass Filter (T>90%@580-2000nm, OD3@200-560nm) $50.00 575nm
LP360 Longpass Filter (T>90%@370-1200nm, OD3@200-350nm)
$50.00
CUT-ON: 360nm
LP370 Longpass Filter (T>85%@380-1100nm, OD5@200-360nm)
$50.00
CUT-ON: 370nm
LP390 Longpass Filter (T>85%@400-2000nm, OD5@200-380nm)
$50.00
CUT-ON: 390nm
LP400 Longpass Filter (T>85%@410-1100nm, OD5@200-390nm)
$50.00
CUT-ON: 400nm
LP405 Longpass Filter (T>90%@415-1200nm, OD3@200-395nm)
$50.00
CUT-ON: 405nm
LP410 Longpass Filter (T>85%@420-1100nm, OD5@200-400nm)
$50.00
CUT-ON: 410nm
LP420 Longpass Filter (T>85%@430-1100nm, OD5@200-410nm)
$50.00
CUT-ON: 420nm
LP425 Longpass Filter (T>90%@435-1100nm, OD6@200-420nm)
$50.00
CUT-ON: 425nm
LP430 Longpass Filter (T>90%@435-1200nm, OD3@200-420nm)
$50.00
CUT-ON: 430nm
LP435 Longpass Filter (T>90%@440-1800nm, OD4@200-430nm)
$50.00
CUT-ON: 435nm
LP440 Longpass Filter (T>95%@445-1200nm, OD6@200-435nm)
$50.00
CUT-ON: 440nm
LP450 Longpass Filter (T>95%@455-1200nm, OD4@200-445nm)
$50.00
CUT-ON: 450nm
LP480 Longpass Filter (T>90%@490-1100nm, OD2@200-470nm)
$50.00
CUT-ON: 480nm
LP500 Longpass Filter (T>85%@510-1200nm, OD5@200-490nm)
$50.00
CUT-ON: 500nm
LP510 Longpass Filter (T>85%@520-1200nm, OD5@200-500nm)
$50.00
CUT-ON: 510nm
LP520 Longpass Filter (T>90%@525-1200nm, OD6@200-510nm)
$50.00
CUT-ON: 520nm
LP530 Longpass Filter (T>90%@540-1200nm, OD5@200-520nm)
$50.00
CUT-ON: 530nm
LP540 Longpass Filter (T>95%@550-1200nm, OD5@200-530nm)
$50.00
CUT-ON: 540nm
LP550 Longpass Filter (T>90%@560-1200nm, OD3@200-540nm)
$50.00
CUT-ON: 550nm
LP575 Longpass Filter (T>90%@580-2000nm, OD3@200-560nm)
$50.00
CUT-ON: 575nm

What is a Longpass Filter

Longpass Filter allow longer wavelength to pass through while blocking shorter wavelength.

For example a LP550 Filter allow 560-1200nm to pass through, while blocking 200-540nm light.

Use below interactive demo to simulation longpass filter with different cut-on wavelength.

Specifications

  • Cut-on Wavelength

    Cut-on wavelength is the point where the filter reach 50% of its peak transmission ratio.

  • Transmit Region

    The region where longpass filter suppose to let light pass through.

  • Tranmission Ratio

    The transmission ratio in the transmit region, usually it is an average value over an area.

  • Blocking Region

    The region where light supposed to be blocked.

  • Optical Density

    To evaluate the attenuation in the blocking region. For example OD3 means there should be less than 0.1% light to go through in blocking region.

  • Transition Area

    The wavelength range between Blocking Region to Transmit Region. Smaller transition area means a better longpass filter.

    Usually it will be 2nm - 30nm.

Frequently Asked Questions

Difference between Longpass Filter and Bandpass Filter

Longpass filter allow a big range of light to go through. This is useful when you need more light range or intensity to pass through.

Longpass Filter VS Shortpass Filter

Shortpass filter allow shorter wavelength to pass through, While longpass filter allow longpass to go through.

This also means, when you need range UV-VIS light to pass through, most cases you will use a shortpass filter.

When you need VIS-NIR light to pass through, you will need a longpass filter.

What is the application of longpass filter?

Longpass filter oftenly used in Fluroscence, Machine Vision, and Raman.

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