High-Precision Fused Silica Windows & Quartz Flats (JGS1 / JGS2)
Chenshi Tech specializes in the precision fabrication of high-grade fused silica optical windows and quartz flats designed for high-power lasers, vacuum chambers, and optical metrology. Unlike commercial-grade optical quartz glass plates, our precision windows undergo double-sided pitch polishing to deliver tight wavefront accuracy (up to lambda/10), low beam deviation, and laser-grade scratch-dig surface finish.
Technical Specifications for Precision Fused Silica Windows
Every fused silica window and optical flat is manufactured to strict optical standards. Custom sizes, steps, holes, and edge profiles are available upon request.
| Specification / Parameter | Laser & Inspection Grade Standards | Standard Commercial Grade |
| Material Grade |
JGS1 (Synthetic UV Fused Silica) |
JGS2 (Optical Grade Quartz) |
| Usable Transmission Range |
185 nm to 2500 nm (Deep UV to NIR) |
220 nm to 2500 nm (UV to NIR) |
| Surface Flatness (Transmitted/Reflected) |
lambda/10 to lambda/20 per 25 mm |
lambda/2 to 1 lambda per 25 mm |
| Surface Quality (Scratch-Dig) |
10-5 / 20-10 (MIL-PRF-13830B Laser Grade) |
40-20 / 60-40 |
| Parallelism / Wedge |
Under 10 arcseconds (High-precision flats) |
Under 1 arcminute |
| Wavefront Distortion (P-V) |
Under lambda/4 peak-to-valley |
Under 1 lambda |
| Clear Aperture |
Greater than 90% of central area |
Greater than 85% of central area |
| Surface Roughness (Ra) | Under 0.5 nm (Double-sided pitch polished) | Under 1.5 nm |
| Laser Damage Threshold (LDT) |
Greater than 10 J/cm2 (@ 1064 nm, 20 ns, 20 Hz) |
Standard industrial viewing |
| Edge Finish | 0.2 mm to 0.5 mm x 45-degree protective bevel | Fine ground edge |
Material Grade Selection: JGS1 vs. JGS2
Choosing the correct substrate grade is critical for optical transmission efficiency and system durability:
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JGS1 (UV Synthetic Fused Silica): Made from synthetic raw material (SiCl4). It features Class 0 bubble-free purity, deep ultraviolet transmission down to 185 nm, and virtually zero fluorescence. It is the preferred choice for excimer lasers, high-power Nd:YAG beam lines, and UV lithography.
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JGS2 (Optical Fused Quartz): Produced from high-purity natural quartz crystal. It withstands continuous temperatures up to 1100°C and provides stable optical performance across the visible to near-infrared spectrum. Ideal for industrial viewports, thermal imaging systems, and analytical instruments.
Thin-Film Anti-Reflective (AR) Coatings
To minimize surface Fresnel reflections and maximize optical throughput, we offer high-durability electron-beam dielectric coatings:
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Single-Layer MgF2: Economical anti-reflective solution for visible light applications.
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Broadband Anti-Reflective (BBAR): Reflection (R) under 0.5% across wide bands (350–700 nm, 650–1050 nm, or 1050–1620 nm).
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High-Power V-Coat: Reflection (R) under 0.1% optimized for single laser lines (355 nm, 532 nm, or 1064 nm) with elevated damage thresholds.
Targeted Applications
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High-Power Laser Systems: Laser cavity observation ports, debris shields, and beam splitters.
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Interferometry & Quality Control: Single-surface and dual-surface reference optical flats for verifying mirrors, prisms, and wafers.
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UV & Vacuum Viewports: High-transmission vacuum flange viewports for semiconductor tools and UV curing equipment.
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Defense & Aerospace: Sensor protective windows for airborne optoelectronic pods and thermal imagers.
Advanced Manufacturing Process for Fused Silica Windows
To maintain optical stability and high throughput across high-power laser paths, our **fused silica windows** are fabricated from high-homogeneity synthetic silica ingots. Compared to our standard optical quartz glass plates, precision **fused silica windows** undergo fine grinding, high-precision double-sided planetary pitch polishing, and ultra-clean ultrasonic degreasing.
Every finished batch of **fused silica windows** features low bulk absorption, minimal thermal distortion, and exceptional environmental durability. For engineers seeking optical viewing solutions or protective debris shields, these high-durability **fused silica windows** deliver reliable optical performance across visible, near-infrared, and deep-ultraviolet laser setups.
Frequently Asked Questions (FAQ)
Q: What is the main difference between an optical window and a quartz plate? A: Standard quartz plates prioritize bulk thermal endurance and basic dimensional cutting. Fused silica optical windows undergo double-sided precision polishing to deliver high transmitted wavefront flatness (lambda/10), tight parallelism (under 10 arcseconds), and laser-grade scratch-dig surface finish.
Q: Can you provide certified flatness test reports?
A: Yes. Every laser-grade optical window and flat is verified with Zygo phase-shifting laser interferometers. Transmitted and reflected wavefront reports can be supplied upon request.
Q: Do you support custom geometries and mounting steps? A: Yes. We offer 5-axis CNC ultrasonic edging, stepped rim fabrication, center hole coring, and custom beveling based on your CAD or DXF drawings.
