We take pride in creating high-quality dichroic edge filters, suitable for a wide range of applications including medical, scientific research, and defense. Our filters are typically made of optical glass substrates with multiple layers of dielectric films, offering excellent light transmission capabilities for UV, visible, and infrared applications. These high-transmission filters are designed for robust performance under various conditions, demonstrating outstanding durability and the ability to withstand normal handling and cleaning processes.
I. Product Functions
Our dichroic filters are core optical components for fluorescence detection, precisely separating excitation light from fluorescence. They feature high reflection and transmission performance, shielding stray light interference and ensuring a high signal-to-noise ratio in detection. Customizable in wavelength bands and sizes, they are compatible with various fluorescence detection devices and have strong adaptability.
II. Working Principle
Based on the optical thin film interference effect, by precisely designing the film system structure, it achieves high reflection (reflection rate ≥ 98%) for the excitation light of specific wavelengths and high transmission (transmission rate ≥ 90%) for the fluorescence emitted by the sample. It efficiently separates the two optical paths, avoiding the mixture of excitation light and fluorescence, ensuring accurate detection.
III. Production and Manufacturing
Full-process precision control to build a solid quality foundation: Select high-purity optical substrates and precisely cut and polish them; adopt advanced vacuum coating technology to accurately control the number of layers and thickness of the film system; use top-notch equipment for full-process inspection to ensure that the reflection/transmission performance and band accuracy meet the industry's high standards.
IV. Application Fields
Widely applied in: life science and medical fields (fluorescence microscopes, qPCR instruments, flow cytometers), industrial and scientific research (Raman spectrometers, fluorescence spectral detection), optical equipment (laser beam splitting, imaging systems), and other scenarios.
Ultraopto’s Birefringent Filter (Lyot filter) is a high-precision polarization interference optical filter engineered to produce an ultra-narrow spectral passband using the birefringent properties of optical crystals, serving as a core component in solar astronomy, laser wavelength tuning, biomedical photonics and Raman chemical imaging. Crafted from high-quality birefringent optical crystals including calcite, quartz, a-BBO and YVO4, our Birefringent Filters adopt the classic Lyot filter design with a series of polarizers and wave plates (retarders), delivering an ultra-narrow passband with a full-width at half-maximum (FWHM) of a few nanometers to less than 1nm, and high spectral resolution for precise wavelength selection and spectral filtering. The filters operate based on wavelength-dependent polarization rotation, where birefringent crystals split incident light into ordinary and extraordinary rays with different refractive indices, and polarizers select the desired wavelength component for transmission, enabling narrowband spectral filtering with high polarization selectivity.
Manufactured with ultra-precise crystal cutting, polishing and optical assembly technology, our Birefringent Filters achieve strict angular and dimensional tolerance control, with high-quality anti-reflection coatings on all optical surfaces to minimize reflection loss and maximize transmittance (≥60% in the passband). The filters feature wavelength tunability by adjusting the orientation of the birefringent crystals or changing the temperature of the crystal substrates, enabling continuous or stepwise tuning of the passband center wavelength across a broad spectral range (UV to NIR). We offer both single-plate and multi-plate Lyot filter designs, with multi-plate designs delivering narrower passbands and higher spectral resolution for high-precision applications such as solar astronomy and laser frequency stabilization. The filters are assembled with high-precision mechanical mounts for easy adjustment and alignment, with compact and robust designs that ensure stable optical performance under mechanical vibration and temperature changes.
As a professional manufacturer of precision polarization optical filters, Ultraopto offers fully customized Birefringent Filter solutions to meet your unique spectral and application requirements. Our experienced R&D and engineering team can tailor passband width, center wavelength range, tunability method (mechanical, thermal), birefringent crystal materials and filter assembly design, with ultra-strict tolerance control for high-precision optical systems such as astronomical observatories and laser research laboratories. We also provide custom polarizer and wave plate designs, anti-reflection coatings for specific spectral ranges and high-precision mechanical mounts for easy integration and adjustment.
All custom Birefringent Filter orders undergo multi-stage strict optical performance testing and quality inspection, including transmittance measurement, passband width verification, wavelength tunability testing and polarization selectivity measurement, with a detailed quality inspection report provided to ensure the final product fully complies with your design specifications and application needs. Backed by advanced birefringent crystal processing technology, rich experience in polarization optics design and a complete quality control system, Ultraopto is committed to providing global customers with high-quality Birefringent Filter products and comprehensive polarization optical solutions. For more detailed technical parameters, product quotation information or custom design solutions for our Ultraopto Birefringent Filter, please contact our professional sales and technical team through the official website, and we will provide you with efficient, professional and personalized optical solutions to support the development and production of your high-precision optical systems and scientific research equipment.
