China Wholesale Quartz Optical Disc Suppliers & Exporter for the Brno Market

Technical Whitepaper: Specifying High-Purity Fused Quartz Discs for Precision Photonics

In high-power industrial laser systems, analytical spectroscopy, and precision optomechanics, selecting the appropriate optical glass substrate is pivotal to system performance. While borosilicate glass may suffice for standard thermal-viewing windows, high-intensity laser throughput and deep-ultraviolet (DUV) applications necessitate the deployment of optical grade fused quartz or synthetic fused silica discs. At Lovri Quartz Products Co., Ltd., we control the entire lifecycle of synthetic and natural quartz raw material—from fine sand grinding and chemical acid pickling to core synthesis and CNC ultrasonic polishing.

Fused quartz exhibits an extremely low thermal expansion coefficient (α ≈ 5.5 × 10⁻⁷ /°C between 20°C and 300°C), approximately one-fifth that of standard borosilicate glass. This gives our quartz discs almost total immunity to thermal shock and thermal lens aberrations under kilowatt-class continuous-wave (CW) or femtosecond pulsed laser excitation. When high-energy photons interact with glass containing trace impurities, optical absorption triggers local thermal gradients, resulting in wavefront distortion, beam defocusing, and eventually catastrophic component fractures.

Our factory implements multi-stage stress annealing via computer-controlled resistance furnaces. Optical discs are soaked above the annealing point of 1215°C and cooled slowly through the strain point (1120°C). Every single batch is subsequently checked with an automated polarization stress inspection system to confirm residual optical path differences do not exceed ≤ 10 nm/cm. This strict birefringence mitigation eliminates unexpected optical path delays in polarizing beam splitters and laser harmonic generation devices.