A cemented true zero-order waveplate is formed by bonding a single-piece quartz crystal true zero-order waveplate with an H-K9L/JGS1 substrate. The quartz crystal features an extremely thin true zero-order thickness, while the K9/JGS1 substrate is used to enhance mechanical strength. A single-piece true zero-order waveplate consists solely of one piece of quartz crystal, mainly applicable for wavelengths above the near-infrared band. It is widely used in optical communication and lasers.