基于激光频率梳的极多波长干涉精密测距方法研究

激光精密测距在天文领域应用极其广泛，但某些特殊情况，如，恒星光干涉仪延迟线光程差补偿的精密测量及大口径非球面镜镜面检测，测距需同时满足高精度、大范围和高速度，这对于目前的激光测距技术提出了极大挑战。基于激光频率梳和虚拟成像相位阵列的极多波长干涉测距法有望解决上述问题。本项目拟研究该测距方法的物理机制和关键技术，在此基础上，结合本团队提出的高精度数据采集处理及拟合方法，实现测距的大范围（>50米）、高精度（10纳米量级）及高速度（~100Hz）。该方法测量精度与采样速度无关联，测量误差不随待测距离而累加，且装置紧凑，造价低，有潜力在天文领域得到实用。

Laser precise ranging has extremely wide applications in various fields of astronomy. But in some special cases, for example: high precision tracking the compensation of the optical path difference in a delay line system of the long baseline stellar interferometer, or testing the optical figure of aspheric off-axis segments for extremely large telescope during their manufacturing processes, there are three main requirements for ranging technology: higher precision, larger measurement range and faster update rate. .In this proposal, a newly developed numerous-wavelength interferometry ranging technology based on the laser frequency comb and virtually imaged phase arrays is expected to fulfill the above requirements. This project intends to study the physical mechanism and key technologies of the ranging method. On this basis, combining with the high-precision data acquisition and processing and the fitting method proposed by our team, the ranging approach could hopefully achieve a wide range (>50m), high resolution (in scale of 10 nm) and high speed (~100 Hz) distance measurement. .The precision of this approach is independent of the measured distance and the measurement error is non-incremental. Benefited from the compact, low-cost and environmentally insensitive setup, this distance measurement approach has great potential for practical application in astronomical fields.