We offer high-quality notch filters suitable for a wide range of high-end applications, including medical imaging, Raman spectroscopy, laser system interference resistance, scientific research experiments, and defense optics. Our notch filters are typically made of high-purity optical glass substrates and multi-layer precision dielectric hard films. They feature narrow-band precise cutoff and high background transmission without loss, effectively filtering out specific wavelengths of interfering light (such as laser stray light and fluorescence background interference) while efficiently transmitting the target band of light.
They are perfectly adapted to the full spectrum from ultraviolet to visible and near-infrared. These high-performance notch filters undergo strict process control and environmental testing, designed for robust performance in complex working conditions. They exhibit excellent durability, chemical stability, and temperature stability, and can withstand normal handling, wiping, and standardized cleaning processes. They do not experience film layer peeling or performance degradation over long-term use, providing stable and precise wavelength selection support for various high-end optical systems.
Ultraopto Optoelectronics is dedicated to creating high-quality notch filters, precisely blocking specific wavelengths of interfering light, while maintaining high stability and durability. They are widely applicable in high-end optical scenarios such as medical, scientific research, laser, and defense fields, providing precise wavelength selection solutions for various optical systems.
1.Product functions
The core feature is to precisely cut off specific narrowband wavelengths while ensuring high transmission and no loss in the background band. It can efficiently filter out interfering light such as laser stray light and fluorescence background without affecting the transmission of the target band light signal. It has excellent environmental stability and durability, can withstand normal handling, wiping and standardized cleaning processes, and there is no performance degradation after long-term use.
2. Working Principle
Based on the interference effect of multi-layer dielectric films, high and low refractive index hard films are alternately deposited on a high-purity optical glass substrate. By precisely controlling the thickness and number of layers, the light of a specific interfering wavelength undergoes destructive interference and is deeply cut off, while the light of the target background wavelength undergoes constructive interference and is efficiently transmitted, achieving precise separation of interfering light and target light.
3. Production and Manufacturing
Adopting standardized and precise optical production techniques, with strict quality control throughout the process: high-purity optical glass substrates are selected and pre-treated through cleaning and polishing; multiple layers of dielectric films are deposited by ion beam sputtering, with real-time monitoring of film parameters; followed by annealing, edge grinding, cleaning and performance testing to ensure the filter's precise cut-off and robust film layers, meeting the standards of high-end optical products.
4. Application Fields
Adapted for high-end optical scenarios in multiple fields, the core applications include:
Medical field: Fluorescence imaging, biochemical detection, filtering out excitation light interference, and enhancing detection accuracy;
Research field:
Raman spectroscopy analysis, spectral testing, precise filtering of stray light to ensure the accuracy of experimental data;
In the field of lasers:
Anti-interference of laser systems, filtering out high-order harmonic stray light, protecting equipment and stabilizing the beam;
In the fields of national defense and industry:
High-end optical detection, machine vision, suitable for complex working conditions, ensuring the stable operation of the system.
Ultraopto’s Notch Filter (bandstop filter) is a high-performance optical filter engineered to provide ultra-deep spectral rejection for a specific narrow wavelength band while transmitting all other wavelengths with high efficiency, serving as a core component in Raman spectroscopy, fluorescence imaging, laser systems and spectral analysis equipment. Crafted from premium optical-grade glass substrates with advanced high-energy ion beam sputtering hard coating technology, our Notch Filters deliver an ultra-high optical density (OD) of >OD6 in the target rejection band, efficiently filtering out unwanted laser excitation wavelengths, stray light or interference signals with minimal transmission (<0.0001%), and a broad transmission band with an average transmittance of over 85% to ensure high-fidelity detection of weak target signals. The filters feature a narrow rejection bandwidth (10nm-27nm) and precise center wavelength control (±1nm), with sharp transition edges between the rejection and transmission bands to maximize spectral selectivity and signal-to-noise ratio in optical detection systems.
Manufactured with strict precision optical processing and coating quality control, our Notch Filters achieve superior surface quality with a 60-40 scratch-dig rating and a clear aperture of over 90%, with durable hard coatings that exhibit excellent scratch resistance, environmental stability and chemical corrosion resistance, ensuring long-term stable performance in both laboratory and industrial working conditions. Standard center wavelengths cover the most common laser excitation wavelengths (355nm, 405nm, 488nm, 532nm, 633nm, 785nm, 1064nm), with fully custom center wavelengths available across the UV, visible and NIR spectral ranges (200nm-2000nm) to match specific laser and application requirements. We offer standard filter sizes with metal protective outer rings for enhanced mechanical durability, and fully custom dimensions, shapes and mounting options to meet diverse optical system integration needs, including compact designs for portable spectroscopy and large-aperture designs for high-power laser systems.
Our Notch Filters are widely recognized as the ideal optical component for Raman spectroscopy, where they filter out intense laser excitation wavelengths to detect low-intensity Raman scattering signals with high sensitivity, and in fluorescence imaging for blocking excitation light and transmitting weak fluorescence signals to achieve high-contrast biological and material imaging. In laser systems, the filters are used for stray light reduction and laser line filtering to protect optical components and detectors from laser radiation, while in spectral analysis equipment and environmental monitoring systems, they eliminate specific interference wavelengths to ensure accurate spectral detection and measurement. They are also essential in biomedical photonics, laser machining and industrial inspection systems for precise spectral filtering and noise reduction, and in astronomical optics for blocking atmospheric emission lines and artificial light interference.
As a leading manufacturer of high-performance bandstop optical filters, Ultraopto offers fully customized Notch Filter solutions to meet your unique spectral and application requirements. Our professional R&D and engineering team can tailor center wavelengths, rejection bandwidths, optical density levels, substrate materials (optical glass, fused silica) and filter dimensions, with ultra-strict tolerance control for high-precision optical systems such as scientific research spectroscopy and high-power laser systems. We also provide custom coating designs for ultra-narrow bandwidths, ultra-deep rejection or broad transmission bands, and anti-reflection coatings to further reduce surface reflection loss and enhance optical performance.
All custom Notch Filter orders undergo multi-stage strict optical performance testing and quality inspection, including transmittance/absorbance measurement, center wavelength verification, optical density testing and environmental stability testing, with a detailed quality inspection report provided to ensure the final product fully complies with your design specifications and application needs. Backed by advanced ion beam sputtering coating technology, rich experience in spectral filter design and a complete quality control system, Ultraopto ensures stable batch supply capacity and consistent product quality, providing global customers with high-quality Notch Filter products and one-stop spectral filter solutions. For more detailed technical parameters, product quotation information or custom design solutions for our Ultraopto Notch Filter, please contact our professional sales and technical team through the official website, and we will provide you with efficient, personalized and professional optical solutions to support the development and optimization of your high-precision optical systems.
