Quartz Glass Fused Silica Radiation Shielding Windows​​ ​​JGS1/JGS2/JGS3

Quartz Glass Fused Silica Radiation Shielding Windows​​ ​​JGS1/JGS2/JGS3 Transparent UV

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 Quartz Glass Characteristic

1. JGS1: Far-Ultraviolet Optical Fused Silica​​

• ​​Characteristics​​:

1. ​​Transmission Range​​: 185–2500 nm, with >85% transmittance at 185 nm (no absorption peaks).
2. ​​Hydroxyl (OH) Content​​: 2000 ppm (synthesis-based), fluorescence-free, ideal for precision UV optical systems.
3. ​​Birefringence​​: <2 nm/cm, superior to conventional optical glass.

• ​​Applications​​:

1. ​​Semiconductor Lithography​​: Substrate for EUV lithography mirrors to minimize UV scattering.
2. ​​Quantum Communication​​: Window material for single-photon detectors to reduce photon loss.

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2. JGS2: Ultraviolet Optical Fused Silica​​

• ​​Characteristics​​:

1. ​​Transmission Range​​: 220–2500 nm, with a hydroxyl absorption peak at 2730 nm (OH content: 100–200 ppm).
2. ​​Fluorescence​​: Emits visible light under 254 nm excitation; avoid intense UV exposure.
3. ​​Mechanical Strength​​: Compressive strength of 1.14 GPa, exceeding JGS1’s 0.7 GPa.

• ​​Applications​​:

1. ​​Laser Machining​​: Window for 1064 nm fiber laser cutting heads, enduring >10⁶ W/cm² power density.
2. ​​High-Temperature Monitoring​​: Industrial furnace observation windows resisting 1450°C thermal shock.

3. ​​JGS3: Infrared Optical Fused Silica​​

• ​​Characteristics​​:

1. ​​Transmission Range​​: 260–3500 nm, >85% transmittance at 3.5 μm (OH content <5 ppm).
2. ​​Impurity Control​​: Metal impurities ≤50 ppm (Fe, Ti), bubble density <5/cm².
3. ​​Thermal Conductivity​​: 1.4 W/(m·K), outperforming JGS2’s 1.38 W/(m·K).

• ​​Applications​​:

1. ​​Aerospace Thermal Imaging​​: Satellite IR sensor windows resistant to cosmic-ray-induced fluorescence.
2. ​​Medical Lasers​​: Lenses for CO₂ laser therapy systems to mitigate thermal lensing.

​​JGS1/JGS2/JGS3 Fused Silica Quartz Glass Key Features

1. Broad Spectral Transmission​​: Full-waveband transmission from 185 nm (JGS1) to 3.5 μm (JGS3), with >90% average visible transmittance.
2. ​​Laser Damage Resistance​​: JGS1’s damage threshold >10 J/cm² (1064 nm, 10 ns pulse).
3. ​​Extreme Temperature Tolerance​​: Short-term use up to 1300°C (JGS1), long-term stability at 1100°C.
4. ​​Chemical Resistance​​: HF etching rate <0.1 μm/h (JGS1), superior alkaline stability (pH >12).

Quartz Fused Silica Glasses JGS1, JGS2, JGS3 ​​Physical Properties

Quartz 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.

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3. High-Temperature Windows​​:

• JGS1: Aerospace thermal protection system observation windows.
• JGS3: Molten metal temperature monitoring systems.

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4. IR/UV Components​​:

• JGS3: Quantum communication single-photon detectors.
• JGS1: Deep-UV laser resonator mirrors.

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%).

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