B70704 Shortpass Filter
UV/blue short-pass filter passing > 90 % below 450 nm with a steep edge that blocks visible and near-IR light for crisp, low-noise measurements.
- Passband: 360 – 455 nm, > 90 % T
- Cutoff (T50): ~470 nm
- Edge steepness: ≤ 15 nm 90 → 10 % transition
- Blocking: < 1 % T from 510 – 800 nm
- Construction: Hard dielectric stack on optical glass
- Custom sizes: 5 – 450 mm; odd shapes on request
Learn more
The B70704 shortpass filter delivers high throughput in the ultraviolet and blue region (below ~455 nm) while plunging to < 1 % transmission across the visible and near-infrared spectrum. Its steep dielectric edge prevents bleed-through, maximising signal-to-noise for fluorescence imaging, UV-LED characterisation, and short-wave spectroscopy. Rugged ion-assisted coatings ensure stability against heat, humidity, and solvents. KUPO can fine-tune cutoff slopes, substrate thickness, or angle-of-incidence response and ship customised parts quickly for OEM integration.
Description
B70704 Shortpass Filter
The B70704 shortpass filter is designed to sharply transmit wavelengths below approximately 455 nm while effectively blocking longer wavelengths in the visible to near-infrared range. Its high peak transmittance (approximately 90% in the passband) and a steep transition edge ensure efficient isolation of the desired spectral region.
Key Advantages
- High Transmission in the UV/Blue Region – Achieves excellent throughput below 455 nm, making it ideal for applications requiring strong signal collection in the ultraviolet and blue spectral bands.
- Steep Cutoff Slope – Provides rapid attenuation of wavelengths above the cutoff point, ensuring minimal light leakage from unwanted regions.
- Robust Blocking of Longer Wavelengths – Delivers superior out-of-band suppression in the visible and near-infrared range, reducing noise and enhancing signal clarity.
- Optical Durability – Manufactured using high-quality coatings and substrates for stability and long operational life, even in demanding conditions.
Typical Applications
- Fluorescence Imaging – Enables precise excitation of fluorophores in the UV/blue range, improving fluorescence detection and reducing background light.
- UV Light Sources and LED Testing – Filters out unwanted visible and IR wavelengths, allowing accurate characterization of UV and blue LEDs or other emission sources.
- Spectroscopy and Analytical Instruments – Ideal for instruments that require selective light transmission for accurate absorbance or reflectance measurements.
- Machine Vision and Quality Control – Enhances contrast and detection in systems monitoring UV-responsive materials or processes.
For customization options, including cutting to any size or shape to meet your specific requirements, please contact us today! With its high transmittance, sharp cutoff, and strong blocking performance, the B70704 shortpass filter is a versatile and reliable solution for a range of optical systems requiring selective transmission of UV to blue wavelengths.
