研究目的
To investigate the feasibility of using laser beams for the mechanical processing of quartz crystal blanks to replace traditional mechanical processing methods, aiming for more efficient and cost-effective manufacturing processes.
研究成果
The surface profile of the quartz crystal has been changed by the burning effect of the pico-second laser, making the thickness of blanks stepped and thinner. However, the performance of the resonator is not improved as expected. Further study is needed to improve the scanning scheme, including the laser beam and radiation areas, to achieve optimal results.
研究不足
The performance of the resonator is not improved as hoped, which may be related to the choice of laser illumination pattern and surface conditions. The roughness of the crystal is increased after laser processing.
1:Experimental Design and Method Selection:
The study uses laser beams of different strengths and durations to scan selected surface areas of quartz crystal blanks to modify their properties. The laser processing is validated before applying it to quartz crystal blanks of resonators for improvements.
2:Sample Selection and Data Sources:
Quartz crystal blanks of AT-cut type are selected from the TXC production line for easy preparation and measurement. Test samples are for 40MHz crystal resonators.
3:List of Experimental Equipment and Materials:
Pico-second laser of 532nm wavelength, 10ps pulse width, and the largest power of 7 Watts (DCT Corporation, Tianjin, China) is used. The laser spot diameter is 15μm.
4:Experimental Procedures and Operational Workflow:
The quartz crystal blanks are divided into six regions for laser scanning with different power settings and exposure times. The scanning speed is set to 300 mm/s.
5:Data Analysis Methods:
Performance parameters of each resonator such as RR, C0, and Q are measured and compared to evaluate the effect of laser treatment.
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