Optical Filters
Optical Filters
Interference Bandpass Filters
Thickness: 0.25″ nominal
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: Commercial Polish
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.25 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >80% of diameter
Chamfer: 0.3mm at 45 typical
Reflective Neutral Density Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Absorptive Neutral Density Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Long Wave Pass Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Short Wave Pass Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Color Glass Bandpass Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Color Glass Long Wave Sharp Cut Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Heat Control Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical
Heat Absorbing Filters
Thickness: VUV CaF2, UVFS or BK7
Surface Flatness: Figure: λ/2 for Y-direction, λ/4 for X-direction @ 633nm
Surface Quality: 20 – 10 laser quality
Centration Error: <3 arc min.
Focal Length Tolerance: Â ±0.5 %
Diameter Tolerance: +0.0/-0.20 mm
Thickness Tolerance: ±0.25 mm
Clear Aperture: >85% of diameter
Chamfer: 0.3mm at 45 typical