The SP18 Samarium Doped (10%) Fused Silica Tube with a 1mm frosted outer layer is a precision optical component engineered for spectral calibration, light conditioning and scattering applications. Manufactured from high purity fused silica with a controlled 10% samarium doping level, this tube combines stable spectral absorption with an intentionally roughened outer surface that homogenizes transmitted light. The compact geometry, with an outer diameter of 9.95mm, an inner diameter of 8mm and a total length of 67.5mm, allows direct installation into standard calibration light source housings and spectrophotometer optical trains. Every tube is produced through a controlled melting and drawing process that preserves the purity of the silica matrix while maintaining a uniform 1mm frosted wall, ensuring dependable optical behavior in demanding measurement environments.

• Uniform samarium doping: The 10% samarium dopant is distributed evenly through the fused silica matrix, eliminating localized concentration variation that could distort spectral calibration results.
• Stable spectral absorption: The doped body delivers repeatable attenuation across the operating wavelength range, supporting consistent output from standard calibration light sources.
• Frosted outer wall for light homogenization: The 1mm frosted layer scatters and evens out the transmitted beam, reducing hot spots and improving uniformity for optical testing setups.
• High temperature resistance: Fused silica construction allows reliable operation at elevated temperatures without deformation, softening or loss of optical clarity.
• Strong chemical stability: The high purity silica surface resists moisture, weak acids and common laboratory reagents, keeping optical performance stable over long service life.
• Consistent dimensions: Tight control of outer diameter, inner diameter and length ensures the tube fits existing holders and optical assemblies without rework.

The SP18 samarium doped fused silica tube is designed for optical systems that require controlled attenuation, uniform light distribution and stable spectral response. It is widely used as a matching sleeve for spectral standard calibration light sources, where the doped silica body conditions the beam and produces a reliable reference output. In spectrophotometers, the tube serves as an attenuation component that keeps detector signals within the linear measurement range. The frosted outer wall makes the SP18 an effective optical homogenizing and scattering part, smoothing intensity variations in the light path before it reaches the sample or detector. It is also adopted as a standard optical component for testing instruments, providing engineers with a repeatable reference for alignment, intensity verification and routine quality control. Across these applications, the SP18 delivers the high purity, stable optical behavior and dependable long term performance required by laboratory and industrial measurement environments.

• Accurate and controllable doping concentration: The 10% samarium level is verified during production, giving customers a predictable absorption profile that matches their optical design specifications.
• Consistent frosted layer thickness: The 1mm outer frosted wall is held uniform along the full 67.5mm length, ensuring even scattering behavior from tube to tube.
• Tight dimensional tolerance: Outer diameter, inner diameter and length are maintained within narrow limits, enabling direct drop-in installation into standard optical assemblies.
• Good optical repeatability: Batch to batch consistency in doping uniformity, surface finish and dimensions ensures that replacement tubes perform identically to the original components in service.