Real Time Chirp Control of an External-Cavity Semiconductor laser for Absolute Distance Measurement

摘要

A new laser range finder using optical feedback interferometry has been developed. Our purpose is to design a high-accuracy sensor for short distances, the principle being based on the use of a Mach-Zender interferometer to control the chirp of the laser diode. Experimetnally, a distance to the target of 10 cm with an accuracy of +-50 mu m has been determined.