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China Suppliers Factory Multi IR Long-Pass Filter: High Transmittance for Accurate Temperature Detection
Hot Products
Products Categories
Featured Products
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 Suppliers Factory Multi IR Long-Pass Filter: High Transmittance for Accurate Temperature Detection

Introducing our MULTI IR Long-Pass Filter, a high-performance optical component manufactured by leading suppliers in China. This filter boasts a wide cutoff bandwidth, deep cutoff depth, high transition steepness, and exceptional transmittance, making it ideal for precision applications such as temperature detection, human body sensing, and industrial temperature measurement. Our factory offers customization options for size, cutoff wavelength, and spectral parameters, ensuring that our products meet the specific design requirements of various optical systems. Trust our expertise as one of the top China suppliers for your optical filtering needs
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    Name 5% CUT ON 50% CUT ON HT (nm) Tmin Tavg Size (mm) Sub Tmax Tavg Spectrogram
    LP1200 / 1200 1300~4800 / ≥80 Φ0.1~300 Sapphire <1
    Spectrogram
    LP1500 1500 1600~5300 ≥85 Φ0.1~300 Sapphire <1
    Spectrogram
    LP1600 / 1600 1650~1700 / ≥90 Φ0.1~300 Quartz <1
    Spectrogram
    / 1600 1650~1660 / ≥90 Φ0.1~300 White Glass <1
    Spectrogram
    LP2000 1930 2000 2100~2800 / ≥85 Φ0.1~300 Sapphire <1
    Spectrogram
    LP2400 / 2400~11100
    11100~13300    		 ≥80 / Φ0.1~300 Ge <5
    Spectrogram
    LP2750 2700 2750 2800~3670 / ≥90 Φ0.1~300 Quartz <1
    Spectrogram
    LP2800 2800 2950~5100 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP2900 2900 3050~5100 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP3200 3320 3400 3480~5350 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3300 3200 3300 3400~5000 / ≥90 Φ0.1~300 Sapphire <1
    Spectrogram
    LP3450 / 3450 3700~5000 / ≥93 Φ0.1~300 Ge <1
    Spectrogram
    LP3500 3600 3670 3800~5600 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3550 / 3550 3800~5500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3600 / 3600 3960~4800 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3650 3540 3620 3700~5200 / ≥85 Φ0.1~300 Sapphire <1
    Spectrogram
    LP3700 / 3700 4000~5500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3730 0.1 3730 4400~4900 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3750 3750 3800~4900 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3760 / 3760 3960~4800 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3800 / 3800 4200~5500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP3850 / 3850 4000~5000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP4000 3850 4000 4100~5100 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP4250 4350~5000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP4730 4730 4900~5150 / ≥80 Φ0.1~300 Sapphire <1
    Spectrogram
    LP5500 5500 / 7500~13500 / ≥72 Φ0.1~300 Sapphire <1
    Spectrogram
    LP6100 / 6100 6300~12600 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP6200 / 6200 6400~12600 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP6300 / 6300 6550~14500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP6400 / 6400 6500~12600 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP6900
    		 6900 7030 7200~12610 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP6500 / 6500 6800~11000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP6750 / / 7000~14000 / ≥80 Φ0.1~300 ZnSe <1
    Spectrogram
    LP7150-A 7150 / 8000~11000 / ≥90 Φ0.1~300 Ge 20 <5
    Spectrogram
    LP7150-B 7150 / 8000~12000 / ≥80 Φ0.1~300 Ge lens 15 <3
    Spectrogram
    LP7200 / / 10000~12600 / ≥90 Φ0.1~300 Ge 10 <1
    Spectrogram
    LP7300 7420 / 8000~11000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7400 / 7400 8000~14000 / ≥80 Φ0.1~300 Ge lens <1
    Spectrogram
    LP7500 / / 8400~12500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7675 7675 8000~14000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7700 / 7700 8000~11000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7730 7730 / 8000~14000 / ≥80 Φ0.1~300 Ge wafer <1
    Spectrogram
    LP7750 7750 8100~11000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7800 / 7800 8100~11000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7850 / 7850 8000~11000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP7900 / 7900 8200~11000 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7925 / 7925 8100~12600 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP7950 / 7950 8050~14000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP8000 / 8000 8150~12000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP8100 / 8100 8150~12000 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP8200 8200 / 9000~14000 / ≥80 Φ0.1~300 Ge wafer <1
    Spectrogram
    LP8400 8400 / 8800~15000 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP9000 9000 9500~12500 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP9700 9700 10100~15000 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP9800 / 9800 10000~16300 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP9900 / 9900 10000~16300 / ≥85 Φ0.1~300 ZnSe <1
    Spectrogram
    LP10000 / 10000 10150~14300 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP10015 / 10015 10450~14500 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP10080 / 10080 10180~13500 / ≥85 Φ0.1~300 Ge 3 <1
    Spectrogram
    LP10100 / 10100 10150~14300 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP10200 / 10200 10500~14000 / ≥85 Φ0.1~300 Ge 3 <1
    Spectrogram
    LP10300 / 10100 10500~13000 / ≥85 Φ0.1~300 Ge 3 <1
    Spectrogram
    LP10400 / 10325 10500~15000 / ≥90 Φ0.1~300 ZnSe <1
    Spectrogram
    LP10500 / 10500 10700~15000 / ≥85 Φ0.1~300 ZnSe <1
    Spectrogram
    LP10600 / 10600 11000~14000 / ≥80 Φ0.1~300 Ge 5 <1
    Spectrogram
    LP10840 / 10840 10940~13500 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP10900 / 10900 11200~15400 / ≥80 Φ0.1~300 Ge <1
    Spectrogram
    LP11050 / 11050 11200~15400 / ≥80 Φ0.1~300 Ge <1
    Spectrogram
    LP11190 / 11190 11500~15700 / ≥80 Φ0.1~300 Ge <1
    Spectrogram
    LP11400 / 11400 11600~12250 / ≥90 Φ0.1~300 Ge <1
    Spectrogram
    LP11600 / 11600 11800~12200 / ≥85 Φ0.1~300 Ge <1
    Spectrogram
    LP11700 / 11700 11900~12300 / ≥80 Φ0.1~300 Ge <1
    Spectrogram
    LP11900 / 11900 12100~12500 / ≥75 Φ0.1~300 Ge <1
    Spectrogram
    1 2 3
    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)
    What are Longpass (LP) optical filters used for?
    Longpass filters are designed to transmit wavelengths longer than a specific cut-on wavelength while blocking shorter wavelengths. They are commonly used in fluorescence microscopy, spectroscopy, and various industrial imaging applications to isolate specific spectral bands.
    How do I choose the right substrate (Sapphire, Quartz, Ge, ZnSe) for my application?
    The choice of substrate depends on the required transmission range and environmental durability. Quartz is excellent for UV to near-IR, Sapphire offers extreme durability and high thermal conductivity, while Germanium (Ge) and Zinc Selenide (ZnSe) are ideal for mid-to-far infrared (IR) applications.
    Can these optical filters be customized to specific sizes?
    Yes. While our standard stock sizes range from Φ0.1 mm to 300 mm, we offer custom sizing, shapes, and mounting options tailored to meet your specific system integration requirements.
    What do the "5% Cut On" and "50% Cut On" specifications mean?
    "5% Cut On" indicates the wavelength where the filter's transmission first reaches 5% absolute transmission. "50% Cut On" marks the transition point where the transmission reaches 50% of the peak value, defining the nominal starting point of the passband.
    How can I request a quote for custom specifications?
    If our stock items do not meet your requirements, you can click the "contact us" link to submit an inquiry. Our engineering team will assist in designing customized optical coatings to match your target transmission profile.