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China IR Longpass Filter (LP) Suppliers - High-Performance Multi IR Long-Pass Filters from Factory
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IR Longpass Filter (LP)

IR Longpass Filter (LP)
IR Broadband Filter (WBP)

IR Broadband Filter (WBP)
Infrared Narrowband Filter (BP)

Infrared Narrowband Filter (BP)
Infrared Anti-Reflective Filter (AR) Coating

Infrared Anti-Reflective Filter (AR) Coating
Diamond-Like Carbon Filter (DLC) Coating

Diamond-Like Carbon Filter (DLC) Coating
Infrared Beam Splitter Filter (BS)

Infrared Beam Splitter Filter (BS)
Infrared Dual-Channel Filter (BP+BP)

Infrared Dual-Channel Filter (BP+BP)
Infrared Dual-Channel Filter (WBP+LP)

Infrared Dual-Channel Filter (WBP+LP)
Infrared Dual-Channel Filter (WBP+WBP)

Infrared Dual-Channel Filter (WBP+WBP)
AR Coating

AR Coating
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IR Longpass Filter (1).jpg
IR Longpass Filter (2).jpg
IR Longpass Filter LP (3).jpg

China IR Longpass Filter (LP) Suppliers - High-Performance Multi IR Long-Pass Filters from Factory

Introducing our MULTI IR Long-Pass Filter, a premium optical component designed for high-precision applications. With its wide cutoff bandwidth, exceptional cutoff depth, steep transition characteristics, and superior transmittance, this filter is ideal for various uses including temperature detection, human body sensing, and industrial temperature monitoring. As a leading factory and supplier in China, we offer customization options for size, cutoff wavelength, and spectral parameters to meet the specific needs of your optical systems. Enhance your applications with our expertly crafted filters, designed to deliver outstanding performance and reliability.
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    Name 5% CUT ON 50% CUT ON HT (nm) Tmin Tavg Size (mm) Substrate Tmax Tavg (Block) Spectrogram
    LP1200 / 1200 1300~4800 / ≥80% Φ0.1~300 Sapphire - <1%
    Spectrogram LP1200
    LP1500 - 1500 1600~5300 - ≥85% Φ0.1~300 Sapphire - <1%
    Spectrogram LP1500
    LP1600 / 1600 1650~1700 / ≥90% Φ0.1~300 Quartz - <1%
    Spectrogram LP1600 Quartz
    / 1600 1650~1660 / ≥90% Φ0.1~300 White Glass - <1%
    Spectrogram LP1600 White Glass
    LP2000 1930 2000 2100~2800 / ≥85% Φ0.1~300 Sapphire - <1%
    Spectrogram LP2000
    LP2400 / - 2400~11100
    11100~13300    		 ≥80% / Φ0.1~300 Ge - <5%
    Spectrogram LP2400
    LP2750 2700 2750 2800~3670 / ≥90% Φ0.1~300 Quartz - <1%
    Spectrogram LP2750
    LP2800 - 2800 2950~5100 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP2800
    LP2900 - 2900 3050~5100 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP2900
    LP3200 3320 3400 3480~5350 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3200
    LP3300 3200 3300 3400~5000 / ≥90% Φ0.1~300 Sapphire - <1%
    Spectrogram LP3300
    LP3450 / 3450 3700~5000 / ≥93% Φ0.1~300 Ge - <1%
    Spectrogram LP3450
    LP3500 3600 3670 3800~5600 / ≥90% Φ0.1~300 Ge <1% -
    Spectrogram LP3500
    LP3550 / 3550 3800~5500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3550
    LP3600 / 3600 3960~4800 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3600
    LP3650 3540 3620 3700~5200 / ≥85% Φ0.1~300 Sapphire - <1%
    Spectrogram LP3650
    LP3700 / 3700 4000~5500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3700
    LP3730 0.1 3730 4400~4900 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3730
    LP3750 - 3750 3800~4900 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3750
    LP3760 / 3760 3960~4800 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3760
    LP3800 / 3800 4200~5500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3800
    LP3850 / 3850 4000~5000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP3850
    LP4000 3850 4000 4100~5100 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP4000
    LP4250 - - 4350~5000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP4250
    LP4730 - 4730 4900~5150 / ≥80% Φ0.1~300 Sapphire - <1%
    Spectrogram LP4730
    LP5500 5500 / 7500~13500 / ≥72% Φ0.1~300 Sapphire - <1%
    Spectrogram LP5500
    LP6100 / 6100 6300~12600 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP6100
    LP6200 / 6200 6400~12600 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP6200
    LP6300 / 6300 6550~14500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP6300
    LP6400 / 6400 6500~12600 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP6400
    LP6900 6900 7030 7200~12610 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP6900
    LP6500 / 6500 6800~11000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP6500
    LP6750 / / 7000~14000 / ≥80% Φ0.1~300 ZnSe - <1%
    Spectrogram LP6750
    LP7150-A 7150 / 8000~11000 / ≥90% Φ0.1~300 Ge 20% <5%
    Spectrogram LP7150-A
    LP7150-B 7150 / 8000~12000 / ≥80% Φ0.1~300 Ge lens 15% <3%
    Spectrogram LP7150-B
    LP7200 / / 10000~12600 / ≥90% Φ0.1~300 Ge 10% <1%
    Spectrogram LP7200
    LP7300 7420 / 8000~11000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7300
    LP7400 / 7400 8000~14000 / ≥80% Φ0.1~300 Ge lens - <1%
    Spectrogram LP7400
    LP7500 / / 8400~12500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7500
    LP7675 - 7675 8000~14000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7675
    LP7700 / 7700 8000~11000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7700
    LP7730 7730 / 8000~14000 / ≥80% Φ0.1~300 Ge wafer - <1%
    Spectrogram LP7730
    LP7750 - 7750 8100~11000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7750
    LP7800 / 7800 8100~11000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7800
    LP7850 / 7850 8000~11000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP7850
    LP7900 / 7900 8200~11000 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7900
    LP7925 / 7925 8100~12600 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP7925
    LP7950 / 7950 8050~14000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP7950
    LP8000 / 8000 8150~12000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP8000
    LP8100 / 8100 8150~12000 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP8100
    LP8200 8200 / 9000~14000 / ≥80% Φ0.1~300 Ge wafer - <1%
    Spectrogram LP8200
    LP8400 8400 / 8800~15000 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP8400
    LP9000 - 9000 9500~12500 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP9000
    LP9700 9700 - 10100~15000 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP9700
    LP9800 / 9800 10000~16300 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP9800
    LP9900 / 9900 10000~16300 / ≥85% Φ0.1~300 ZnSe - <1%
    Spectrogram LP9900
    LP10000 / 10000 10150~14300 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP10000
    LP10015 / 10015 10450~14500 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP10015
    LP10080 / 10080 10180~13500 / ≥85% Φ0.1~300 Ge 3% <1%
    Spectrogram LP10080
    LP10100 / 10100 10150~14300 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP10100
    LP10200 / 10200 10500~14000 / ≥85% Φ0.1~300 Ge 3% <1%
    Spectrogram LP10200
    LP10300 / 10100 10500~13000 / ≥85% Φ0.1~300 Ge 3% <1%
    Spectrogram LP10300
    LP10400 / 10325 10500~15000 / ≥90% Φ0.1~300 ZnSe - <1%
    Spectrogram LP10400
    LP10500 / 10500 10700~15000 / ≥85% Φ0.1~300 ZnSe - <1%
    Spectrogram LP10500
    LP10600 / 10600 11000~14000 / ≥80% Φ0.1~300 Ge 5% <1%
    Spectrogram LP10600
    LP10840 / 10840 10940~13500 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP10840
    LP10900 / 10900 11200~15400 / ≥80% Φ0.1~300 Ge - <1%
    Spectrogram LP10900
    LP11050 / 11050 11200~15400 / ≥80% Φ0.1~300 Ge - <1%
    Spectrogram LP11050
    LP11190 / 11190 11500~15700 / ≥80% Φ0.1~300 Ge - <1%
    Spectrogram LP11190
    LP11400 / 11400 11600~12250 / ≥90% Φ0.1~300 Ge - <1%
    Spectrogram LP11400
    LP11600 / 11600 11800~12200 / ≥85% Φ0.1~300 Ge - <1%
    Spectrogram LP11600
    LP11700 / 11700 11900~12300 / ≥80% Φ0.1~300 Ge - <1%
    Spectrogram LP11700
    LP11900 / 11900 12100~12500 / ≥75% Φ0.1~300 Ge - <1%
    Spectrogram LP11900

    The above list shows our current stock items.

    If you don't see what you are looking for, please contact us.

    Frequently Asked Questions (FAQ)

    Q: What is the function of a Longpass (LP) optical filter?

    A Longpass filter is designed to transmit wavelengths longer than the designated cut-on wavelength while blocking (reflecting or absorbing) shorter wavelengths across UV, Visible, SWIR, MWIR, or LWIR spectral bands.

    Q: What substrate materials are available for these longpass filters?

    Our longpass filters utilize optimized optical substrate materials depending on wavelength ranges, including Germanium (Ge), Sapphire, Zinc Selenide (ZnSe), Quartz, and Optical White Glass to achieve superior transmittance and thermal stability.

    Q: What is the difference between 5% Cut-On and 50% Cut-On points?

    The 5% cut-on point indicates the transition wavelength where transmission begins to emerge, whereas the 50% cut-on wavelength is the standard reference point representing the transition threshold between blocking and high transmission bands.

    Q: Can custom sizes, shapes, or optical coatings be customized?

    Yes, we support custom dimensional manufacturing from Φ0.1 mm to 300 mm, customized circular/rectangular dimensions, custom edge finishes, and application-specific hard thin-film coatings tailored to your project requirements.

    Q: What typical applications use infrared longpass filters?

    These filters are widely deployed in thermal imaging devices, FTIR spectroscopy, gas detection systems, environmental monitoring, IR laser instruments, and security defense optics.

    Q: How do I request a quote for non-standard filter specifications?

    Simply click the inquiry contact link in the notification box above or reach out with your specific cut-on wavelength, substrate preference, dimensions, and quantity for a direct technical consultation and quotation.