Soild Fused Silica Etalons with Broadband Metallic Coatings

It is very difficult to create very broadband dielectric coatings, however metal coatings are naturally effective over a wide range of wavelengths.  Sadly, they also absorb a significant amount of energy and as the reflectivity is pushed higher, the absorption also increases.  Our metal coated etalons, or Metalons, are a compromise that achieves a reasonable finesse of about 2.5 using coatings that are about between 30% and 40% reflective from 350nm to 900nm.  The result is a peak transmission of about 40%, so if you need really high transmission and no loss then then is not your etalon.  But the modulation is about 75% so if your application calls for wavelength monitoring then the metalon might just work great and will almost certainly work for your wavelength range!

  • Material:  Fused Silica, 7980 OA Grade
  • Wavelength range: 350nm to 900nm
  • Finesse: approximately 2.5, varies by wavelength
  • FSR: see thickness table
  • Thickness uniformity (wedge) <2nm rms over the clear aperture
  • Clear aperture: 20.0mm
  • Surface quality: 80/50 or better
  • Surface figure: λ/10
  • Diameter: 25.4
  • * If your etalons require coatings then we can use our fluid jet polishing system to reduce the wedge and increase the finesse

Contact us anytime for custom items - that's what we do

METALONS
$850

Fused Silica Etalon, FSR 2/cm, Broadband metallic coating

Part Number: OP-8565-1686-1
Details: Solid Fused Silica Etalon, FSR 2/cm, Broadband metallic coating, transmission < 50%, modulation ~30% of output signal from 350nm to 900nm (metalon)

$780

Fused Silica Etalon, FSR 1/cm, Broadband metallic coating

Part Number: OP-8565-3371-1
Details: Solid Fused Silica Etalon, FSR 1/cm, Broadband metallic coating, transmission < 50%, modulation ~30% of output signal from 350nm to 900nm (metalon)

$780

Fused Silica Etalon, FSR 0.5/cm, Broadband metallic coating

Part Number: OP-8565-6743-1
Details: Solid Fused Silica Etalon, FSR 0.5/cm, Broadband metallic coating, transmission < 50%, modulation ~30% of output signal from 350nm to 900nm (metalon)