IR Filters — Precision Infrared Bandpass Filters for Advanced Optical Applications
At Bote Optics, we specialize in custom-made IR filters that meet the stringent requirements of modern infrared systems. Whether you’re working with IR pass filters, NIR bandpass filters, or need a tailored IR filter sheet for DIY projects or prototyping, we provide hard-coated, durable solutions with high transmittance and excellent environmental resistance.
Infrared (IR) filters, also known as IR pass filters or infrared bandpass filters, selectively transmit infrared light while blocking visible and unwanted wavelengths. They are essential in applications such as:
- Infrared imaging
- Thermal sensing
- Machine vision
- Biomedical diagnostics
- Night vision
- Remote controls
- Surveillance and security
🔍 What Is an IR Filter?
An IR filter (infrared filter) is an optical component designed to allow the transmission of IR light while blocking visible and/or other unwanted wavelengths. These filters come in various spectral ranges, such as NIR (Near-Infrared) and Mid-IR, and are often categorized based on their center wavelength (CWL) and bandwidth.
For example, an IR bandpass filter 850nm transmits infrared light centered at 850 nanometers, which is commonly used in IR LEDs and NIR cameras.
🧩 Types of IR Filters Available at Bote
| Filter Type | Center Wavelength (CWL) | Coating Type | Typical Applications |
|---|---|---|---|
| IR Bandpass Filter 850nm | 850 nm ± 10 nm | Hard-coated | NIR imaging, motion sensors |
| NIR Bandpass Filter | 700–1100 nm | AR / Hard | Eye-tracking, biometrics |
| Infrared Bandpass Filter | Custom 1000–5000 nm | DLC / AR | Thermal imaging, spectroscopy |
| Blue Bandpass Filter | 400–500 nm | Hard-coated | Fluorescence microscopy |
| IR Pass Filter Sheet | Custom sizes | Film or Glass | DIY kits, prototyping |
| IR Filter Film | Thin flexible | Laminated | Displays, lenses |
We also offer custom IR filters to match your unique optical system. Please contact us for design consultation or to upload your specifications.
🧪 Key Features of Our Infrared Bandpass Filters
- High Transmission Efficiency: ≥90% in passband
- Excellent Out-of-Band Blocking: OD4 or higher
- Hard-Coated Durability: Long-lasting and resistant to moisture, heat, and abrasion
- Customizable Size & Shape: Round, square, rectangular, or as per drawing
- Environmentally Stable: Ideal for outdoor and high-humidity environments
Explore our Optical Coating Capabilities for more insights on DLC and BBAR coatings.
🛠️ Custom IR Pass Filters for OEMs and Researchers
At Bote Singapore, we support OEMs, research institutes, and universities with tailor-made IR filters. Whether you need filters in volume for integration into a lens assembly or a DIY IR pass filter for a lab experiment, we can deliver precision and consistency.
Our production capabilities in Nanjing (China) ensure full-spectrum optical manufacturing, while our Singapore site offers localized QC, prototyping, and rapid support.
🧷 IR Pass Filter DIY – Quick Tips
Interested in building your own IR camera or motion detector? Here’s how to use an IR pass filter DIY style:
- Remove the visible light-blocking filter from your camera lens.
- Apply an IR pass filter film or sheet over the sensor.
- Use an 850nm or 940nm LED light source to test sensitivity.
Need materials? Reach out to us for small batch IR filter sheets or custom shapes suitable for tinkering or testing.
🌍 Industries We Serve
- Surveillance & Security
- Life Sciences & Bioimaging
- Machine Vision & Automation
- Aerospace & Defense
- Laser Systems
- Environmental Monitoring
Our optical bandpass filters are compatible with major IR systems from FLIR, Thorlabs, and Hamamatsu.
📷 Product Images & Filter Performance
(Include product photos or illustrations, e.g., filter shapes, spectral transmission graphs)
Example: Spectral Transmission Graph for IR Bandpass Filter 850nm
(Graph showing transmission curve with CWL at 850 nm and OD4 blocking outside the range)
❓ Frequently Asked Questions (FAQ)
Q1: What is the difference between an IR pass filter and a bandpass filter?
A: An IR pass filter usually refers to a longpass filter that blocks visible light and transmits IR. A bandpass filter, on the other hand, allows a specific range of wavelengths (a “band”) to pass through while blocking all others.
Q2: Can I use IR filters for night vision?
A: Yes, many night vision systems use NIR filters (750–1000 nm) to enhance image contrast in low-light or no-light environments.
Q3: Do you offer IR filters for UV and visible blocking?
A: Absolutely. Our optical bandpass filters can be designed to block UV and visible regions while transmitting IR.
Q4: What materials are your filters made from?
A: Common substrates include BK7, fused silica, germanium, and silicon, depending on the wavelength range and application.
📞 Contact Us for a Custom Quote
At Bote, we combine decades of optical manufacturing expertise with flexible customization options. Send us your drawing or requirements via our contact form, or email us at [email protected].
We ship globally, and all products are quality tested to international standards.