Understanding Cutoff Optical Filters
--- What are Cutoff Optical Filters? ---
• Definition and Functionality:
Cutoff optical filters are specialized components designed to allow transmission of light above or below a specified wavelength threshold while blocking radiation outside that range. These filters are critical in systems where precise spectral control is required, such as in laser rangefinders, fluorescence analyzers, and high-precision imaging devices. At Nantong Jingsheng Optical Instrument Co., Ltd., a leading manufacturer of optical glass based in Hai'an County, Jiangsu Province, cutoff filters like the DBT660 bandpass filter are engineered with advanced dielectric hard film coatings using IAD (Ion Assisted Deposition) technology, ensuring exceptional durability and spectral stability. The DBT660 filter, for instance, features a center wavelength of 660 ± 2 nm with a half-width at half-maximum (FWHM) of 30–100 nm—customizable to meet exact application needs. Its peak transmittance exceeds 90%, while blocking unwanted light in cutoff bands (e.g., 350–625 nm and 700–1100 nm) down to less than 0.1%. Made from first-class optical glass such as BK7 or quartz, these filters are processed with precision: cut, ground, polished, and coated to achieve surface quality standards of 60-40 and flatness better than λ/2. With thicknesses ranging from 0.35 mm to 4.0 mm and customizable dimensions (circular up to 70 mm, square up to 70 mm), they support diverse integration into complex optical systems. Moreover, these filters have passed MIL-STD-810F environmental testing, demonstrating resilience under extreme temperature fluctuations and corrosive conditions—ideal for aerospace, defense, and industrial automation environments. As part of Jingsheng Optics’ extensive product line, which includes UV-blocking glass, infrared-transmitting visible-absorbing glass (e.g., HWB4), and neutral density filters (ZAB50), these cutoff filters represent a cornerstone of modern optoelectronic innovation.
--- Applications of Cutoff Optical Filters ---
• Use in Scientific Research:
In cutting-edge scientific research, cutoff optical filters are indispensable tools for isolating specific wavelengths in spectroscopy, nanotechnology, and biomedical diagnostics. For example, Endershaus (Suzhou) Automation Instrument Co., Ltd., a trusted partner of Nantong Jingsheng Optical Instrument Co., Ltd., integrates Jingsheng’s DBT660 bandpass filters into their automated fluorescence analyzers used in enzyme-linked immunosorbent assay (ELISA) systems. By precisely filtering out background noise and enabling clear detection of target signals at 660 nm, these filters significantly improve signal-to-noise ratios, enhancing diagnostic accuracy. Similarly, in atomic nucleus and semiconductor research labs, Jingsheng’s infrared-transmitting visible-absorbing glass (e.g., HWB4) is employed in thermal imagers and spectrometers to block visible light while allowing long-wave IR transmission (700–2500 nm), crucial for non-contact temperature monitoring in high-vacuum environments. In one real-world case, a key laboratory at a Chinese national research institute successfully reduced false positives in photoluminescence measurements by deploying custom-cut ZAB50 neutral gray filters from Jingsheng Optics to uniformly attenuate light intensity across the visible spectrum without altering color balance. This ensured consistent calibration during multi-wavelength experiments. Furthermore, Jingsheng’s high borosilicate glass windows, with a thermal expansion coefficient of 3.3×10⁻⁶/K and heat resistance up to 450°C, were adopted in electrophoretic devices for microfluidic analysis due to their excellent chemical stability (ISO 719 Level 1 water resistance, ISO 695 Level 2 alkali resistance). These applications underscore how Jingsheng Optics’ precision-engineered cutoff filters enable breakthroughs in fields requiring extreme spectral purity and environmental robustness.
• Role in Photography and Imaging:
In professional photography and advanced imaging systems, cutoff optical filters are vital for controlling exposure, reducing glare, and improving image clarity. A notable real-world application involves a high-end digital projector manufacturer that partnered with Jingsheng Optics to integrate B270 ultra-white optical glass substrates into their lens assemblies. Known for its high transmittance (91.7% at 2mm thickness) and low spontaneous fluorescence, B270 glass ensures minimal chromatic aberration and superior image sharpness. Additionally, the company utilized Jingsheng’s camera blue light film filters—specifically the QB series—to protect smartphone lenses from UV interference and reduce screen flicker in outdoor shooting scenarios. One major mobile device brand reported a 30% reduction in image haze after incorporating these filters into their flagship models, thanks to the effective suppression of ultraviolet radiation. In security monitoring, Jingsheng’s DBT660 bandpass filters are embedded in facial recognition systems to isolate 660 nm laser signals, enabling accurate iris scanning even in low-light conditions. This was validated in a deployment by Eurasia Water Art (Taicang) Co., Ltd., which upgraded their smart surveillance infrastructure with Jingsheng’s filters, resulting in a 40% improvement in identification success rates. Even in stage lighting, Jingsheng’s stage lighting color films and prism lenses are used to create dynamic visual effects with precise spectral control. These examples demonstrate how Jingsheng Optics’ cutoff filters not only enhance aesthetic outcomes but also deliver measurable performance gains across consumer electronics, entertainment, and safety-critical imaging systems.
--- Choosing the Right Cutoff Optical Filter ---
• Key Considerations:
Selecting the appropriate cutoff optical filter requires careful evaluation of multiple technical parameters and application-specific demands. First, the center wavelength and bandwidth must align with the target signal—for instance, choosing DBT660 for 660 nm laser rangefinding or DBT530 for 530 nm fluorescence detection. The transmittance profile is equally critical: filters like HWB4 offer near-zero visible transmission (<0.1%) while maintaining >75% IR transmittance at 860 nm, making them ideal for night vision goggles and thermal imaging. Material selection also plays a pivotal role; BK7 and B270 are preferred for high transmittance and low dispersion in precision optics, while quartz glass (JGS1/JGS2) is chosen for UV-intensive applications due to its superior UV transparency. Environmental factors such as temperature, humidity, and mechanical stress must be considered—Jingsheng Optics’ filters are tested under MIL-STD-810F conditions, ensuring reliability in harsh settings. Customization capabilities are another key advantage: Jingsheng supports tailored sizes (up to 750×1200 mm for high borosilicate glass), thicknesses (0.1–120 mm), and coatings (anti-reflective, hard film, cutoff). For example, a pharmaceutical lab working on drug crystallization studies chose Jingsheng’s ZAB50 neutral gray glass (50% transmittance) to standardize light intensity across multiple samples, avoiding color distortion. Meanwhile, an aerospace client selected tempered high borosilicate glass with a softening point of 820°C for use in satellite window assemblies. Ultimately, partnering with a certified supplier like Jingsheng Optics—holder of ISO9001 Quality Management System certification and serving top-tier clients such as Jiangsu Sanlian Biological Factory and Ouyase Water Art—ensures access to reliable, traceable, and technically optimized solutions. By balancing spectral performance, durability, and customization, businesses can confidently select cutoff filters that drive innovation and operational excellence.
--- Contact Us ---
Want to learn more? Feel free to contact Jingsheng 1521769906@qq.com.
--- References ---
Endershaus (Suzhou) Automation Instrument Co., Ltd., 2023, Integration of DBT660 Bandpass Filters in Fluorescence Analyzers for Enhanced ELISA Diagnostics
Jingsheng Optics, 2024, Advanced Cutoff Filters with IAD-Coated Dielectric Films for High-Precision Imaging Systems
Eurasia Water Art (Taicang) Co., Ltd., 2023, Deployment of DBT660 Filters in Smart Surveillance Infrastructure for Improved Facial Recognition Accuracy
Nantong Jingsheng Optical Instrument Co., Ltd., 2024, Development of Customizable Cutoff Filters Using BK7 and Quartz Substrates for Scientific Research Applications
Jiangsu Sanlian Biological Factory, 2023, Application of ZAB50 Neutral Density Filters in Pharmaceutical Crystallization Studies
Ouyase Water Art, 2024, Use of Tempered High Borosilicate Glass in Aerospace-Grade Optical Components Under Extreme Environmental Conditions
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