To overcome the speed limitation of conventional optical tomography, a temporal imaging technique has been integrated with optical time-domain reflectometry to realize ultrafast temporally magnified (TM) tomography. In this Letter, the sensitivity of TM tomography has been further enhanced using optical parametric amplification and distributed Raman amplification, and this technique is named temporally encoded amplified and magnified (TEAM) tomography. As a result, a 78-dB sensitivity has been realized, comparable to ultrafast optical coherence tomography systems. In addition, an 86.7-μm axial resolution can be realized across a 67.5-mm imaging range. To demonstrate the significance of sensitivity improvement, tomographic imaging of a centimeter-thick phantom is provided at an A-scan rate of 44 MHz.

中文翻译：

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通过参量和拉曼放大的时间成像增强灵敏度的超快光学层析成像

为了克服常规光学层析成像的速度限制，时间成像技术已与光学时域反射仪集成在一起，以实现超快速的时间放大（TM）层析成像。在这封信中，通过使用光学参量放大和分布式拉曼放大进一步提高了TM层析成像的灵敏度，该技术被称为时间编码放大和放大（TEAM）层析成像。结果，已经实现了78 dB的灵敏度，可与超快速光学相干断层扫描系统相媲美。此外，在67.5mm的成像范围内可以实现86.7μm的轴向分辨率。为了证明提高灵敏度的重要性，以44 MHz的A扫描速率对厘米厚的体模进行了层析成像。