Solid etalons are used to select a very narrow set of wavelengths in transmission, or to reduce the bandwidth of a source. The solid etalons available from our catalog are made of high quality UV-grade fused silica, precisely polished for high surface quality, low transmitted wave-front error, and ultra-low wedge. They are then coated with a partially reflective e-beam dielectric film, with reflectivity ranging from 30% to 97%. Our catalog etalons are offered purely as a semi-custom part to allow you to select the thickness, wavelength, and reflectivity needed, with delivery in less than 2 weeks.
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Standard & Semi-custom
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Additional Custom Options
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Types
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Solid
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Materials
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UV-grade fused silica
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Infrasil, crystal quartz and Suprasil 1
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Diameter
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25.4 mm
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Up to 100 mm
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Thickness
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0.25 to 15.0 mm
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Minimum 10 μm
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Coatings
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Partially reflective dielectric,
from 30% to 97% reflectivity |
Partially reflective dielectric,
from 10% to 99% reflectivity |
Quality
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Laser quality
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See manufacturing tolerances below
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Surface Tolerances
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Standard
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Laser Quality
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High Precision
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Surface quality (scratch - dig)
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40 - 20
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10 - 5
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5 - 2
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Transmitted wavefront error
(P-V @ 633 nm before coating) |
λ/2
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λ/10
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λ/20
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Effective finesse
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0.22 to 13.4
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Up to 50
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Dimensional Tolerances
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Standard
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Precision
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High Precision
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Diameter (mm)
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+0.000 / -0.250
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+0.000 / -0.025
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+0.000 / -0.005
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Etalon thickness (mm)
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± 0.250
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± 0.150
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± 0.010
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Wedge
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≤ 5 arc min
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≤ 1 arc sec
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≤ 0.5 arc sec
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Clear aperture (%)
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≥ 85%
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≥ 90%
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100%
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