Recent advances in SAW laser probe
Recent advances in SAW laser probe
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SAW激光探针的最新进展
DOI：
10.1109/ultsym.1996.583779
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
C. Hartmann
中科院分区：
文献类型：
--
作者：
S. Jen;C. Hartmann
声表面波激光探测技术的最新进展包括对所有三种主要表面波类型(瑞利、泄漏和短波)的测量。第一个进步涉及改进的实验技术和数据分析方法。这大大减少了激光腔模的有害影响，提高了测量的动态范围。时间-频率和位置-波矢的二象性被进一步用来分别检查在时间和频率上或在空间和波矢上重叠的波。瑞利波探测的两个例子展示了横向耦合谐振器滤波器的测量动态范围大于100分贝，并在单反弹RAC设备中清楚地分离了不同的波。第二个进步是用基于刀口的激光探头探测主要横向偏振的泄漏表面波。足够的探头灵敏度使定量数据分析成为可能，从而提取直接相关的器件设计参数。漏波探测的例子展示了36/spl deg/-litao/sub3/的直接测量的漏波频散关系，以及在纵向耦合的腔谐振腔滤波器中测量的模式分布。第三个进步涉及探测纯横向极化STW的技术。基于光弹效应，这一新技术使封装器件中的STW探测成为可能。给出了一种现成的600 MHz窄带石英SSBW滤波器的实验结果。
Recent advances in SAW laser probe techniques encompass measurements of all three major surface wave types (Rayleigh, leaky and STW). The first advance involves improved experimental techniques and data analysis methods. This has led to greatly reduced deleterious effects caused by laser cavity modes and enhanced measurement dynamic range. The time-frequency and position-wavevector dualities have been further exploited for separate examination of waves that are overlapped either in time and frequency or in space and wavevector. Two examples of Rayleigh wave probing demonstrate greater than 100 dB measurement dynamic range from a transversally coupled resonator filter, and clear separation of different waves in a single-bounce RAC device. The second advance concerns probing the predominately transversely polarized leaky surface waves by the knife-edge based laser probe. Adequate probe sensitivity has enabled quantitative data analysis, resulting in extraction of directly relevant device design parameters. Examples of leaky wave probing demonstrate a directly measured leaky wave dispersion relationship for 36/spl deg/-LiTaO/sub 3/, and the measurement of mode profiles in a longitudinally coupled cavity resonator filter. The third advance concerns a technique for probing the purely transversely polarized STW. Based on the photoelastic effect, this new technique has enabled practical STW probing in packaged devices. Results from an off-the-shelf 600-MHz narrowband quartz SSBW filter are presented.