JGS1/JGS2/JGS3 Transparent UV Fused Silica Radiation Shielding Windows
Quartz glass, particularly JGS1, JGS2, and JGS3, is an amorphous material synthesized from high-purity silicon dioxide (SiO₂ ≥ 99.99%) via hydroxy flame melting or electric fusion. Its core characteristics include:
- Optical Performance: Broad spectral transmission ranging from ultraviolet (185 nm) to mid-infrared (3.5 μm), with visible light average transmittance >90%.
- Thermal Stability: Thermal expansion coefficient as low as 5.5×10⁻⁷/°C (20–320°C), softening point at 1683°C, and operational stability at 1100°C for prolonged periods.
- Chemical Inertness: Resistant to all strong acids except hydrofluoric acid, and 30× more alkali-resistant than ceramics and 150× more than stainless steel.
JGS1/JGS2/JGS3 Fused Silica Characteristic
1. JGS1: Far-Ultraviolet Optical Fused Silica
- Transmission Range: 185–2500 nm, with >85% transmittance at 185 nm (no absorption peaks).
- Hydroxyl (OH) Content: 2000 ppm (synthesis-based), fluorescence-free, ideal for precision UV optical systems.
- Birefringence: <2 nm/cm, superior to conventional optical glass.
- Semiconductor Lithography: Substrate for EUV lithography mirrors to minimize UV scattering.
- Quantum Communication: Window material for single-photon detectors to reduce photon loss.
2. JGS2: Ultraviolet Optical Fused Silica
- Transmission Range: 220–2500 nm, with a hydroxyl absorption peak at 2730 nm (OH content: 100–200 ppm).
- Fluorescence: Emits visible light under 254 nm excitation; avoid intense UV exposure.
- Mechanical Strength: Compressive strength of 1.14 GPa, exceeding JGS1’s 0.7 GPa.
- Laser Machining: Window for 1064 nm fiber laser cutting heads, enduring >10⁶ W/cm² power density.
- High-Temperature Monitoring: Industrial furnace observation windows resisting 1450°C thermal shock.
3. JGS3: Infrared Optical Fused Silica
- Transmission Range: 260–3500 nm, >85% transmittance at 3.5 μm (OH content <5 ppm).
- Impurity Control: Metal impurities ≤50 ppm (Fe, Ti), bubble density <5/cm².
- Thermal Conductivity: 1.4 W/(m·K), outperforming JGS2’s 1.38 W/(m·K).
- Aerospace Thermal Imaging: Satellite IR sensor windows resistant to cosmic-ray-induced fluorescence.
- Medical Lasers: Lenses for CO₂ laser therapy systems to mitigate thermal lensing.
JGS1/JGS2/JGS3 Fused Silica Key Features
- Broad Spectral Transmission: Full-waveband transmission from 185 nm (JGS1) to 3.5 μm (JGS3), with >90% average visible transmittance.
- Laser Damage Resistance: JGS1’s damage threshold >10 J/cm² (1064 nm, 10 ns pulse).
- Extreme Temperature Tolerance: Short-term use up to 1300°C (JGS1), long-term stability at 1100°C.
- Chemical Resistance: HF etching rate <0.1 μm/h (JGS1), superior alkaline stability (pH >12).
Fused Silica Glasses JGS1, JGS2, JGS3 Physical Properties
| Parameter |
JGS1 |
JGS2 |
JGS3 |
| Maximum size |
<200 mm |
<300 mm |
<200 mm |
| OH content |
1200 ppm |
150 ppm |
5 ppm |
| Fluorescence (excited at 254nm) |
Almost none |
Strong V-b |
Strong V-b |
| Impurity content |
5 ppm |
20–40 ppm |
40–50 ppm |
| Birefringence Constant |
2–4 nm/cm |
4–6 nm/cm |
4–10 nm/cm |
| Melting method |
Synthetic CVD |
Oxy-hydrogen melting |
Electric melting |
| Applications |
Laser substrates, windows, lenses, prisms, mirrors |
Semiconductor and high-temperature windows |
Infrared and ultraviolet substrates
|
Fused Silica Glasses JGS1, JGS2, JGS3 Applications
1. Laser Substrates:
- JGS1: High-power laser resonator mirrors to suppress thermal wavefront distortion.
- JGS2: Fiber laser cutting head windows.
2. Semiconductor Manufacturing:
- JGS2: Wafer defect inspection UV source windows.
- JGS3: Lithography machine UV transmission components.
3. High-Temperature Windows:
- JGS1: Aerospace thermal protection system observation windows.
- JGS3: Molten metal temperature monitoring systems.
4. IR/UV Components:
- JGS3: Quantum communication single-photon detectors.
- JGS1: Deep-UV laser resonator mirrors.
Fused Silica Glasses JGS1, JGS2, JGS3 Processing & Treatment
1. Cutting:
- Laser Cutting: JGS1 ultra-thin sheets (<0.5 mm) with ±1 μm precision; JGS3 large plates (>200 mm) to avoid thermal stress cracks.
2. Surface Treatment:
- Chemical Polishing: JGS1 refractive index uniformity <λ/20 (λ=632.8 nm); JGS3 anti-reflective coatings (e.g., MgF₂, >99.5% transmittance at 200–2500 nm).
3. Thermal Treatment:
- Annealing: JGS1 annealed at 1215°C for 2 hours to eliminate stress birefringence; JGS3 vacuum annealing to reduce bubble density.
Fused Silica Glasses JGS1, JGS2, JGS3 Q&A
1. Q: What are the key differences between JGS1, JGS2, and JGS3 quartz glass?
A: JGS1 (185-2500nm) is optimized for deep UV, JGS2 (220-2500nm) for standard UV, and JGS3 (260-3500nm) for infrared, with distinct hydroxyl content and impurity levels.
2. Q: Which industries use JGS3 quartz glass?
A: Semiconductor lithography, aerospace infrared sensors, and biomedical imaging due to its high IR transmittance (>85%).
Tag: #Optical Fused Silica Glasses, #Customized, #JGS1/JGS2/JGS3, #Transparent UV Grade, #Fused Silica, # Radiation Shielding Windows
Por favor verifique seu email!
