Optical Filters

Bandpass Filters

Custom spectral performance with multilayer optical coatings

Introduction

Bandpass filters are optical filters designed to transmit a defined wavelength range while blocking light outside the selected passband. By precisely controlling spectral transmission characteristics, these filters enable optical systems to isolate specific wavelength regions for accurate light detection and analysis.

Bandpass filters can be customized according to center wavelength, bandwidth, transmission requirements, and blocking performance to meet different optical system designs. This flexibility allows them to be integrated into various imaging, sensing, and measurement applications where specific spectral response is required.

Applications

  • Fluorescence imaging systems
  • Biomedical detection instruments
  • Optical sensing systems

Features & advantages

  • High transmission across the target wavelength band
  • Customizable center wavelength and bandwidth options
  • Effective blocking of unwanted wavelengths
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Product specifications

Parameter Specification
Filter Type Bandpass filter
Dimensions (mm) 5 – 200
Thickness (mm) 1 – 10
Substrate Material Optical glass / fused silica typical
Center Wavelength 250 nm – 2500 nm
Bandwidth (FWHM) 5 nm – 100 nm
Peak Transmission >80% (typical)
Blocking Range OD3 – OD6 (typical)
Surface Quality 60/40 S/D typical, tighter options available

Specifications represent typical capabilities for bandpass filter. Final parameters are confirmed according to specific spectral and coating requirements.

Technical capabilities & processing options

  • Optical Filter Coating:
    Advanced coating processes enable precise spectral characteristics, including customized center wavelengths and bandwidth requirements.
  • Spectral Performance Control:
    Optical testing verifies transmission curves, blocking performance, and spectral accuracy for consistent filter performance.
  • Substrate and Surface Processing:
    Precision substrate preparation and surface finishing ensure reliable optical quality for different applications.
  • Custom Filter Design:
    Customized filter configurations can be developed according to wavelength range, operating conditions, and system requirements.

Need a Custom Bandpass Filter?

Share your center wavelength, bandwidth, transmission requirements, and filter dimensions. Our team can review optical specifications, coating design, and customization requirements for your application.

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