线性扫频激光源在高分辨率、高精度、大动态范围的激光测量和光纤传感领域有着广泛的应用。然而,扫频非线性及激光相位噪声限制了测量系统的分辨率、精度和动态范围。分析了分布反馈式(DFB)半导体激光扫频中的非线性及激光相位噪声产生的机制,提出基于预畸变和光锁相的激光扫频非线性校正和激光相位噪声抑制方法,实现了扫频范围为50 GHz,均方根频率误差小于263 k Hz的激光扫频信号。实验测试表明该扫频激光源的线性度和相干性得到了有效增强。
Optical interferometry has been widely used in various high-precision applications. Usually, the minimum precision of an interferometry is limited by various technical noises in practice. To suppress such kinds of noi...
详细信息
Optical interferometry has been widely used in various high-precision applications. Usually, the minimum precision of an interferometry is limited by various technical noises in practice. To suppress such kinds of noises, we propose a scheme[1] which combines the weak measurement with the standard interferometry. The proposed scheme dramatically outperforms the standard interferometry in the signal-to-noise ratio and the robustness against noises caused by the optical elements' reflections and the offset fluctuation between two paths. Moreover, the scheme can be expanded to difference weak measurement[2]. The difference weak measurement simultaneously fulfills the requirements of high precision, wide dynamic range, and strong robustness, which makes it a powerfully practical tool for phase-shift measurement and other metrological tasks.
暂无评论