Custom Optical Filter
Optical filters are essential components for spectral selection, signal isolation, and system optimization. Coligh Optics is a leading optical filter manufacturer in China, offering a wide range of in-stock standard filters and custom-designed solutions for biomedical, industrial, and scientific applications.
Coligh Optical Filter Key Advantages
- Precise Spectral Control: We offer both broadband bandpass filters with widths of several hundred nanometers and ultra-narrow bandpass filters with full-width at half-maximum (FWHM) as narrow as 0.25 nm, with tolerances up to ±0.1 nm. Ultra-narrow bandwidths enable highly selective wavelength transmission and effectively suppress background noise.
- High Transmission Rate:Achieve peak transmittance >90% or even >98% within the target passband or stopband range, enhancing the efficiency of optical systems.
- Exceptional Blocking Depth: Our filters can provide blocking depths of OD4, OD6, or even OD8 in the stopband, effectively suppressing unwanted light signals outside the target wavelength.
- Steep Edge Transitions: Sharp transitions from 90% to 1% transmittance enable excellent square profiles and highly accurate wavelength separation.
- Low Wavefront Distortion：Substrate flatness and parallelism are controlled within 1/20λ. High-quality optical substrates such as K9, B270, D263T, Corning glass, and fused silica are used to ensure high-precision imaging performance
- Precision Surface Quality：To minimize scattering and ensure imaging clarity, we strictly control surface quality (scratch-dig rating). Our standard filters meet optical surface quality levels of 80/50, 60/40, 40/20, and can be customized down to 20/10.
Coligh Different Optical Filter Series By Spectrum
Coligh Different Optical Filters Series By Application
Custom Optical Filter Design Guidance
Custom Wavelength & Spectral Parameters
To accurately manufacture your optical filter, please provide:
- Center Wavelength (CWL): e.g., 532 nm
- Bandwidth (FWHM): e.g., 10 nm, 40 nm, or ultra-narrow <1 nm
- Blocking Requirements: OD value (e.g., OD4, OD6) and spectral range to block
- Transmission Target: Peak transmittance, e.g., >90%
Application or System Type: Helps us optimize slope and spectral design
Custom Material & Substrate & Shape & Dimensions
Please confirm or specify the following:
- Preferred Substrate: Optical glass (K9, B270, D263T), fused silica, sapphire, etc.
- Wavefront Flatness & Parallelism: For imaging or laser applications, specify λ/10, λ/20, etc.
- Thermal / Mechanical Requirements: For high-temperature or vacuum environments
- Environmental Stability Needs: Anti-humidity, anti-scratch, etc.
- Shape: Circular, square, or custom shape (CAD drawings if available)
- Outer Dimensions: Diameter or length × width
- Thickness: Standard (e.g., 1.0 mm), or specify custom
Tolerances: For diameter, thickness, flatness, and chamfer if applicable
Custom Coating Design
For accurate thin-film design and deposition, please inform us of:
- Coating Type: Bandpass, longpass, shortpass, notch, dichroic, laser-line, etc.
- Wavelength Range: Working range (e.g., 200–1100 nm)
- Incidence Angle: 0°, 45°, or custom AOI
- Polarization Considerations: Especially important for angled incidence or laser use
- Laser Damage Threshold (if needed): Pulse energy or CW power
Optical Filter Applications We served
Scientific Research
Our filters serve the spectral analysis and imaging needs in physics, chemistry, and biology research experiments, supporting customized parameters and highly tailored requirements.
Biomedical
Our filters are applied in fluorescence microscopes, fluorescence imaging, PCR instruments, endoscopes, and other devices, enabling highly sensitive signal detection to support precision medicine.
Industrial Inspection
Our filters are widely used in machine vision, automated inspection, laser processing, and industrial camera systems, achieving precise spectral selection and efficient signal recognition.
Aerospace and Defense
In laser ranging, infrared imaging, and optoelectronic tracking systems, our optical filters maintain high stability and reliability under harsh environments.
Consumer Electronics
In AR/VR, laser projection, sensor modules, and other emerging technologies, our filters enable precise light control within compact designs.
Environmental Monitoring
In gas detection, water quality analysis, and solar monitoring, our filters provide stable spectral separation and background suppression.
