The SP23 20% Samarium Doped Quartz Glass Tube is a precision fused silica component engineered with a wall thickness of 1.5mm for optical systems that demand stable attenuation and reliable spectral performance. Manufactured from high purity quartz glass with a controlled 20% samarium doping level, this glass tube delivers consistent light absorption behavior across repeated measurement cycles. The compact tubular geometry, with an outer diameter of 17mm and an inner diameter of 14mm, makes the SP23 a direct fit for existing optical path assemblies while offering improved uniformity over conventional undoped quartz components. Each tube is produced through a mature melting and drawing process that preserves the structural integrity of the fused silica matrix, ensuring that the doped glass tube maintains its optical characteristics even under prolonged exposure to high intensity light sources and elevated working temperatures.

• Uniform rare earth doping: The 20% samarium dopant is distributed evenly throughout the quartz matrix, eliminating localized concentration variation that could distort spectral absorption results.
• Stable spectral absorption: The doped tube provides repeatable attenuation behavior across the operating wavelength range, supporting consistent calibration of optical instruments.
• High temperature resistance: Fused quartz construction allows the glass tube to operate reliably at elevated temperatures without deformation, softening or loss of optical transparency.
• Strong chemical stability: The high purity silica body resists attack from moisture, weak acids and common laboratory reagents, keeping the optical surfaces clean and durable over a long service life.
• Consistent wall thickness: Precise dimensional control ensures a uniform 1.5mm wall along the full 84.8mm length, minimizing light path variation between individual tubes.

The SP23 samarium doped quartz glass tube is designed for optical and analytical systems where controlled light attenuation and stable spectral response are critical. It is commonly installed as a core component in spectral attenuation instruments, where the doped glass body absorbs specific wavelengths to produce a calibrated output signal. Optical testing equipment benefits from the uniform doping profile of the tube, which reduces measurement error and improves repeatability during routine verification and quality control procedures. In optical path calibration parts, the tight dimensional tolerances and consistent wall thickness help engineers establish reliable reference baselines for alignment and intensity checks. The tube is also used as a light source accessory for analytical instruments, protecting sensitive components and conditioning the beam before it reaches the sample or detector. These application areas share a common requirement for high purity materials, stable optical behavior and dependable long term performance, all of which the SP23 delivers through its carefully controlled manufacturing process.

• Accurate and controllable doping concentration: The 20% samarium level is verified during production, giving customers a predictable absorption profile that matches their optical design specifications.
• Tight dimensional tolerance: Outer diameter, inner diameter and length are held within narrow limits, allowing direct installation into existing holders and optical assemblies without additional machining.
• No impurity precipitation at high temperature: The high purity matrix keeps dopant elements firmly bound even under thermal stress, preventing contamination of the optical path and preserving long term stability.
• Good optical repeatability: Batch to batch consistency in doping uniformity, wall thickness and surface quality ensures that replacement tubes perform identically to the original components in service.