Shaanxi Ireeda Protective Technology Co., Ltd.
Engineer Manager : Ms.Melin
WhatsApp: +8618291418396
E-mail: melin@ireeda.com
Overview
IREEDA Precision Shortpass Edge Filters are engineered to selectively transmit shorter wavelengths while effectively blocking longer, undesirable wavelengths (typically in the Near-Infrared or Infrared spectrum). Utilizing advanced Hard-Coating (Sputtering) technology, these filters offer a remarkably sharp transition (steep slope) between the transmission and blocking regions.
Whether you are removing infrared noise from a CMOS sensor, isolating excitation bands in fluorescence microscopy, or protecting sensitive components from heat buildup, our filters provide high out-of-band rejection (up to OD6) and superior environmental durability.
- Ultra-Sharp Edge Transition: Precision-engineered thin-film stacks ensure a rapid transition from high transmission to deep blocking, maximizing spectral contrast.
- Deep Blocking Performance: Available in OD4 to OD6 (Optical Density) ratings, effectively suppressing unwanted long-wave signals down to 0.0001% or less.
- High Peak Transmission: Achieves T>90−95% in the passband, ensuring maximum signal-to-noise ratio for imaging and sensing applications.
- Superior Environmental Stability: Hard-coated surfaces are resistant to humidity, temperature fluctuations, and abrasion, ensuring a long service life in industrial environments.
- Extensive Customization: IREEDA provide cut-off wavelengths ranging from UV to NIR. Custom shapes (round, square, or mounted) and dimensions are available to fit any optical housing.
Specification
|
Product Type |
Shortpass Edge Filter |
|
Cut-off Wavelengths |
400nm, 500nm, 650nm, 700nm, 750nm (Customizable) |
|
Transmission (Targ) |
> 90% (Passband) |
|
Blocking Depth (OD) |
OD2 - OD6 (Wavelength dependent) |
|
Edge Steepness |
<1% or < 3% (Customizable) |
|
Material Substrate |
K9 (BK7)/ UV Grade Fused Silica |
|
Surface Quality |
40/20 or 20/10 Scratch-Dig |
|
Clear Aperture |
>90% |
|
Operating Temperature |
-50°Cto +200°C |
FAQ
Q: What is the difference between an IR-Cut filter and a Shortpass filter?
A: "IR-Cut filter" is a common application-specific term used in the camera industry (blocking IR light from sensors). A "Shortpass filter" is the technical optical term that defines the broader category. All IR-Cut filters are shortpass filters, but not all shortpass filters are for IR cutting (some work in UV or blue-green bands).
Q: How does the Angle of Incidence (AOI) affect the filter?
A: Shortpass filters are sensitive to the AOI. As the angle increases from 0 degree, the cut-off wavelength will shift toward shorter wavelengths (Blue shift). We recommend a 0 degree AOI for optimal performance unless a specific angle is requested during design.
Q: Can these filters be used with high-power LED or Laser sources?
A: Yes, but for high-power applications, we recommend the Fused Silica substrate with a high laser damage threshold (LDT) coating to prevent thermal stress and focal shift.
Keywords: Shortpass Filter, Shortpass Edge Filter, IR-Cut Filter, Short-wave Pass Filter, Optical Edge Filter, Hard Coated Filter, High-Contrast Filter, Machine Vision Filter, Fluorescence Filter, Cold Mirror, Sensor Filter.
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