Custom Etalons Precision Filters, Engineered for Your Wavelength

Tailored Performance Lunt Optics designs and manufactures custom Fabry–Pérot etalons tailored to your exact specifications. We work with you to deliver etalons that meet your precise performance targets.

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Designed for Peak Optical Performance Unlike off-the-shelf filters with rigid constraints, Lunt Optics offers fully custom etalon assemblies—built to your wavelength, bandwidth, material, and size requirements. Our engineers partner with your team to develop Fabry–Pérot designs that balance spectral performance, thermal stability, and mechanical durability.

Technical Advantages

Every custom etalon from Lunt is the result of careful materials selection, ultra-precise polishing, and high-performance coating.

Every custom etalon from Lunt is the result of careful materials selection, ultra-precise polishing, and high-performance coating.

🔹 Ultra-Flat Etalon Plates: Our etalon surfaces are polished to λ/40 peak-to-valley or better across >98% of the clear aperture. Sub-arcsecond parallelism between plates ensures uniform spacing, producing high-finesse transmission profiles with minimal fringe distortion.

🔹 High-Reflectivity Coatings: We offer dielectric mirror coatings with >99% reflectance at your target wavelength, enabling sharper fringes and greater finesse. Coatings are ion-assisted for durability and stability in fielded systems.

🔹 Tunable Designs: Air-spaced etalons can be configured for thermal tuning, air pressure modulation, or piezoelectric actuation, enabling real-time control of the passband. For fixed-gap applications, we fabricate sealed cavity etalons with fused spacer feet or solid-plate monoliths.

🔹 Material Flexibility: Substrates include UV-grade fused silica, Zerodur®, ClearCeram®, and other low-expansion glasses for maximum thermal and spectral stability. Each material is chosen to match your performance and environmental needs.

🔹 Ultra-Flat Etalon Plates

🔹 High-Reflectivity Coatings

🔹 Tunable Designs

🔹 Material Flexibility

Technical Specifications

Etalons

  • Parameter Specification Range
  • Substrate Materials ULE, SF, BK7, Sapphire (Visible Only), Zerodur, Fused Silica, ClearCeram
  • Type – Solid Wafer 2mm × 2mm and up to 75mm Diameter
  • Type – Solid Etalons 35mm to 75mm Diameter
  • Type – Air Spaced 20mm to 160mm Diameter
  • Type - Thermally Stable - Riser - Air Spaced 4mm x 4mm and up
  • 20mm to 75mm Diameter
  • Tuning Tilt, Air pressure, Thermal, Piezo, Vacuum, Gas - type dependant
  • Spectral Range 390 nm to 840 nm (Visible Light)
  • Etalon Flatness λ/20 to λ/100
  • Aperture Utilization 95% of overall aperture typical
  • Transmitted Wavefront λ/50

Applications

  • Laser stabilization cavities (e.g. for telecom, quantum optics, metrology)
  • Tunable narrowband filters in remote sensing, LIDAR, and spectroscopy
  • Solar and atmospheric imaging instruments requiring sharp, isolated bandpasses
  • Research-grade interferometers where etalon finesse determines system resolution

Let’s Build the Etalon Your System Deserves

📩 Request a Quote
🧠 Use the Etalon Calculator
📞 Contact our engineers