1. Introduction

Optical quartz glass, an important material for optical devices, has a significant impact on the quality of its surface, which in turn affects the final imaging quality. It is evident that the process of polishing optical quartz glass is of vital importance. However, during the polishing process, surface scratches may occasionally occur. The subsequent discussion will address the underlying causes and solutions to surface scratches on optical quartz glass following polishing.

2. The cause of surface scratches

(1) Improper abrasive

The use of inappropriate abrasives has the potential to cause superficial scratches to the surface of optical quartz glass. For instance, the use of abrasive particles that are too large or too hard can cause scratches or friction marks on the surface of optical quartz glass.

(2) Inappropriate stress

During the polishing process, inadequate pressure can result in scratches on the surface of optical quartz glass, whereas excessive pressure can also cause damage. Excessive pressure may result in the abrasive dragging on the surface of the optical quartz glass, potentially leaving friction marks. However, insufficient pressure will result in inadequate contact force, leading to uneven and incomplete polishing of the surface.

(3) Improper temperature

Excessively high temperatures can cause the surface of optical quartz glass to soften, resulting in protrusions or surface melting. Furthermore, the surface is prone to scratching during the polishing process. However, it is important to note that excessively low temperatures can cause the surface to harden excessively, which can make it difficult to polish and more susceptible to damage.

3. Solutions

(1) Replace the suitable polishing abrasive

The selection of the appropriate abrasive for polishing should be made according to the particle size, hardness and other characteristics of the optical quartz glass suspension. For instance, when working with quartz glass, which is relatively high in hardness, it is advisable to use abrasives with a similarly high level of hardness.

(2) Adjust the polishing parameters

When polishing, it is important to adjust parameters such as pressure and temperature appropriately according to the actual situation. It should be noted that both excessively high and low levels carry potential risks.

(3) Carry out secondary polishing

Following the initial polishing process, an inspection of the optical quartz glass is recommended, after which a second polishing may be undertaken based on the observed conditions. This treatment is designed to address and repair existing surface scratches more effectively.

4. Conclusion

Surface scratches are an inevitable consequence of the polishing process for optical quartz glass. The causes may include the use of abrasives, pressure or temperature. Therefore, during the polishing process, it is necessary to select suitable abrasives, adjust appropriate polishing parameters, and carry out secondary polishing based on the actual situation, etc., to ensure the stability and reliability of the surface quality of optical quartz glass.