硬质玻璃抵抗刮伤。
相对与硬质玻璃，更换有机玻璃或硬质塑料也可以降低监控频率，但需考虑材质老化带来的影响。
Compared to the hard glass replacing the synthetic glass or rigid glass can also lower the frequency of monitoring but the impact of the material ageing shall be taken into consideration.
目前，波导CO_2激光器的结构形式近十种，而波导材料也有陶瓷、陶瓷-金属、全金属及硬质玻璃等。
Till now there have been about 10 type structures for wave-guide CO_2 lasers, and many kinds of wave-guide material including ceramic material, ceramic metal, all-metal and hard glass, and so on.
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