光学
光电倍增管
光参量放大器
铌酸锂
光放大器
放大器
光功率
光电探测器
物理
材料科学
光电子学
激光器
信号(编程语言)
探测器
CMOS芯片
程序设计语言
计算机科学
作者
Yi Sun,Haohua Tu,Sixian You,Chi Zhang,Yuan Zhi Liu,Stephen A. Boppart
出处
期刊:Optics Letters
[The Optical Society]
日期:2019-08-29
卷期号:44 (17): 4391-4391
被引量:13
摘要
We present a detection method based on optical parametric amplification to amplify and detect near-infrared (NIR) optical imaging signals. A periodically poled lithium niobate crystal is employed as an optical parametric amplifier (OPA), which provides excellent quasi-phase-matching conditions for the optical parametric amplification process. A weak reflectance imaging signal at 1465 nm is amplified by the OPA with a high gain of up to 92 dB, and the amplified optical signal is detected with a low-cost photodetector under ambient light conditions. Such a high gain leads to a detection limit of 23 pW under a 5 MHz detection bandwidth, which is remarkably lower than the theoretical value of a NIR photomultiplier tube (PMT). By exploiting the advantages of the OPA, the incident power needed for microscopy or imaging is reduced by 40–60 dB. The high imaging gain of the OPA also significantly enhances the imaging penetration depth by selectively detecting the weak signal reflected from deep tissue structures. The successful implementation of the OPA enables a robust and sensitive detection method that offers the potential to replace PMTs in imaging applications within the NIR spectral range.
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