论文标题
用于全光光声成像的快速询问波长调整
Fast interrogation wavelength tuning for all-optical photoacoustic imaging
论文作者
论文摘要
用于光声成像的超声检测的光学检测可在高声频率下具有较大的带宽和高灵敏度。因此，与常规的压电检测相比，使用Fabry-Pérot腔传感器可以实现较高的空间分辨率。但是，在感应聚合物层沉积过程中的制造约束需要精确控制询问光束波长，以提供最佳的灵敏度。这通常是通过使用缓慢可调的窄带激光作为审讯来源来实现的，因此限制了采集速度。我们建议使用宽带源和快速可调的声学过滤器来调整几微秒内每个像素的询问波长。我们通过使用高度不均匀的Fabry-Pérot传感器进行光声成像来证明这种方法的有效性。
Optical detection of ultrasound for photoacoustic imaging provides large bandwidth and high sensitivity at high acoustic frequencies. Higher spatial resolutions can therefore be achieved using Fabry-Pérot cavity sensors, as compared to conventional piezoelectric detection. However, fabrication constraints during deposition of the sensing polymer layer require a precise control of the interrogation beam wavelength to provide optimal sensitivity. This is commonly achieved by employing slowly tunable narrowband lasers as interrogation sources, hence limiting the acquisition speed. We propose instead to use a broadband source and a fast tunable acousto-optic filter to adjust the interrogation wavelength at each pixel within a few microseconds. We demonstrate the validity of this approach by performing photoacoustic imaging with a highly inhomogeneous Fabry-Pérot sensor.
