HSHI-Tech is one of several companies offering glass quartz, and sapphire machining and bonding technologies. We satisfy the high-end, high-quality optical measurement requirements of our customers in the biomedical and chemical industries. Our company has grown to be a leading manufacturer of superior-quality cost-effective precision optical components. Generally, the manufacturing of optical components involves micro-machining, optical polishing, and diffusion bonding in a high-temperature furnace, with cl eaning processes performed between each step. Our core technology is to polish the surface of optical materials to a flatness within 100 nm, and then bond these materials by atomic diffusion. Without the use of adhesive bonding, our optical products are strongly resistant to heat and chemicals, while also having superior optical surface quality.
The micro-machining process is a technology in which HSHI-Tech has particular expertise. A microchannel with width and depth of a few hundred micrometers is achieved using a mechanical micro-milling tool. Furthermore, a micro-hole with a diameter of a few hundred micrometers is manufactured using a specific mechanical micro-drilling technique. Micro-holes smaller than 50 mm can be machined using a laser-drilling technique and a nanosecond laser source, as shown in Fig. 1(a). HSHI-Tech developed a laser-drilling technique for drilling holes with an aspect ratio as high as 20:1, as shown in Fig. 1(b). When quartz and sapphire are being machined, chips and particles are generated in massive quantities. The machining process is similar to that of mechanical wear, whereby micro-diamond particles coating the surface of the drilling and milling bits forcibly hit the surface of work pieces. Thus, maintaining high cleanness is crucial to avoid contamination by particles adhered to material surfaces, which would degrade the optical quality of our products. After long-term experimentation we established a differentiated cleaning process using alkali chemicals such as SC1 and KOH that effectively remove contaminated particles that may be adhered to micro-channels and micro-holes.
In our factory, we employ a seamless system for producing optical and bio parts, as illustrated in Fig. 2. The production line consists of quartz and ceramics machining equipment, a laser drilling and milling machine an optical polisher with a precise polishing pad, and a high-temperature furnace. The surface flatness and roughness of polished quartz and sapphire are measured with a laser interferometer, as shown in Fig. 3.