F-Series High-purity Fused Fiber QuartzF-Series High-purity Fused Fiber Quartz
A benchmark low-OH synthetic fused quartz for the optical fibre industry. It suits MCVD / FCVD / PCVD CVD core deposition, photonic-crystal-fibre sleeve drawing and RIT rod-and-sleeve processes; its low OH content prevents hydroxyl build-up at the core–cladding interface and suits IR power-delivery fibres and specialty fibre preforms.
Key Features
Key features: extremely low hydroxyl (OH⁻) content — below 1 ppm in the standard grade and down to 0.1 ppm in customised versions. Hydroxyl groups in ordinary synthetic quartz cause strong IR absorption peaks near 2700 nm and 3600 nm; the F series largely removes that absorption through a special dehydration process, giving high transmission across the UV, visible and near-IR ranges.
Typical Applications
Specialty fibre preforms, power-delivery fibres and laser fibres;
Near-IR high-power laser optics (1064 nm, 1310 nm, 1550 nm);
IR spectroscopy and IR thermometry windows;
High-vacuum and high-temperature optical assemblies;
Optical systems requiring transmission across the 2.7 – 3.8 μm IR band.
Purity
| Parameter | Parameter |
|---|---|
| OH content | Specified ≤ 1 ppm; typical ≤ 0.2 ppm |
| Chlorine (Cl) content | 800-2000 ppm |
| Fluorine (F) content | No fluorine added (F-free) |
| Trace metal impurities | Below ICP-MS detection limit — ultra-high purity |
Thermal & Optical (tested at 1150 ℃)
| Parameter | Specified value |
|---|---|
| Viscosity at 1150 ℃ | 13.1 dPas |
| Refractive index shift (vs. standard undoped quartz) | +0.35 ~ +0.5 ×10⁻³ |
Supply Geometry
| Tube type | OD | Wall thickness |
|---|---|---|
| Small substrate tube | 10–20 mm | 1–4 mm |
| Standard substrate tube (incl. HP precision) | 20–40 mm | 1–4 mm |
| Small sleeve | 40–60 mm | 4–15 mm |
| Large sleeve | 60–90 mm | 15–30 mm |
| Form tolerance | Small substrate tube | Standard substrate tube | Small sleeve | Large sleeve |
|---|---|---|---|---|
| OD tolerance | ±0.02~0.2 mm | ±0.03~0.2 mm | ±0.1~0.3 mm | ±0.2~0.4 mm |
| Wall thickness tolerance | ±0.02~0.2 mm | ±0.03~0.2 mm | ±0.1~0.3 mm | ±0.2~0.4 mm |
| Ovality | 0.03~0.2 mm HP:0.01~0.03 mm | 0.05~0.2 mm HP:0.01~0.05 mm | 0.1~0.25 mm | 0.15~0.3 mm |
| Wall eccentricity | 0.05~0.12 mm HP:0.02~0.05 mm | 0.07~0.12 mm HP:0.02~0.05 mm | 0.1~0.2 mm | 0.15~0.3 mm |
| Cross-sectional area deviation (CSA) | 1~3 % | 1~2 % | 0.7~2 % | 0.5~1 % |
| Bow | 0.2~0.5 mm/m |
Form tolerances (common to all tubes; the HP precision grade improves on these)
Delivery Forms
Solid quartz rods and quartz sleeves (the mainstream forms for fiber preforms)
Optical blocks and discs for downstream finishing into windows and lenses
Custom tubes and special-shaped parts
